diff options
author | Michael Mann <mmann78@netscape.net> | 2015-01-20 10:05:06 -0500 |
---|---|---|
committer | Michael Mann <mmann78@netscape.net> | 2015-01-20 21:28:18 +0000 |
commit | d2d699aeb020415d355fb9f04339cae1badf7f16 (patch) | |
tree | 4d36aeae6c355fa8a3a0da06b23b17e023436ae2 | |
parent | 160af3ccf3560357fefd6ab5cabefe22cabfeb55 (diff) | |
download | wireshark-d2d699aeb020415d355fb9f04339cae1badf7f16.tar.gz wireshark-d2d699aeb020415d355fb9f04339cae1badf7f16.tar.bz2 wireshark-d2d699aeb020415d355fb9f04339cae1badf7f16.zip |
Move all SigComp functionality to the SigComp dissector.
While it does make packet-sigcomp.c much bigger, there's no reason for it to be in epan directory.
Change-Id: I2d78c32de1d56e76578e610d4df586b5610d1b49
Reviewed-on: https://code.wireshark.org/review/6682
Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
-rw-r--r-- | epan/CMakeLists.txt | 2 | ||||
-rw-r--r-- | epan/Makefile.common | 4 | ||||
-rw-r--r-- | epan/dissectors/packet-sigcomp.c | 4005 | ||||
-rw-r--r-- | epan/sigcomp-udvm.c | 3223 | ||||
-rw-r--r-- | epan/sigcomp-udvm.h | 47 | ||||
-rw-r--r-- | epan/sigcomp_state_hdlr.c | 884 | ||||
-rw-r--r-- | epan/sigcomp_state_hdlr.h | 47 |
7 files changed, 3999 insertions, 4213 deletions
diff --git a/epan/CMakeLists.txt b/epan/CMakeLists.txt index ccbae86d20..b3ff7e4590 100644 --- a/epan/CMakeLists.txt +++ b/epan/CMakeLists.txt @@ -1611,8 +1611,6 @@ set(LIBWIRESHARK_FILES reedsolomon.c req_resp_hdrs.c show_exception.c - sigcomp_state_hdlr.c - sigcomp-udvm.c sminmpec.c sna-utils.c stat_tap_ui.c diff --git a/epan/Makefile.common b/epan/Makefile.common index 4ba1be91d8..b1cc437a60 100644 --- a/epan/Makefile.common +++ b/epan/Makefile.common @@ -81,8 +81,6 @@ LIBWIRESHARK_SRC = \ reedsolomon.c \ req_resp_hdrs.c \ show_exception.c \ - sigcomp_state_hdlr.c \ - sigcomp-udvm.c \ sminmpec.c \ sna-utils.c \ stat_tap_ui.c \ @@ -240,8 +238,6 @@ LIBWIRESHARK_INCLUDES = \ rtp_pt.h \ sctpppids.h \ show_exception.h \ - sigcomp_state_hdlr.h \ - sigcomp-udvm.h \ slow_protocol_subtypes.h \ sminmpec.h \ sna-utils.h \ diff --git a/epan/dissectors/packet-sigcomp.c b/epan/dissectors/packet-sigcomp.c index a2d1fc0e41..3dbbe5d089 100644 --- a/epan/dissectors/packet-sigcomp.c +++ b/epan/dissectors/packet-sigcomp.c @@ -35,8 +35,11 @@ #include <epan/prefs.h> #include <epan/expert.h> #include <epan/to_str.h> -#include <epan/sigcomp-udvm.h> -#include <epan/sigcomp_state_hdlr.h> +#include <epan/strutil.h> +#include <epan/exceptions.h> + +#include <wsutil/sha1.h> +#include <wsutil/crc16.h> void proto_register_sigcomp(void); void proto_reg_handoff_sigcomp(void); @@ -328,14 +331,4004 @@ static int dissect_sigcomp_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree static proto_tree *top_tree; -/* Initialize the state handler +#define UDVM_MEMORY_SIZE 65536 + +/********************************************************************************************** + * + * SIGCOMP STATE HANDLER * + **********************************************************************************************/ +#define STATE_BUFFER_SIZE 20 +#define STATE_MIN_ACCESS_LEN 6 + +/* + * Defenitions for: + * The Session Initiation Protocol (SIP) and Session Description Protocol + * (SDP) Static Dictionary for Signaling Compression (SigComp) + * http://www.ietf.org/rfc/rfc3485.txt?number=3485 */ +#define SIP_SDP_STATE_LENGTH 0x12e4 + +static const guint8 sip_sdp_state_identifier[STATE_BUFFER_SIZE] = +{ + /* -0000, */ 0xfb, 0xe5, 0x07, 0xdf, 0xe5, 0xe6, 0xaa, 0x5a, 0xf2, 0xab, 0xb9, 0x14, 0xce, 0xaa, 0x05, 0xf9, + /* -0010, */ 0x9c, 0xe6, 0x1b, 0xa5 +}; + +static const guint8 sip_sdp_static_dictionaty_for_sigcomp[0x12e4] = +{ + + /* -0000, */ 0x0d, 0x0a, 0x52, 0x65, 0x6a, 0x65, 0x63, 0x74, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x61, 0x63, 0x74, + /* -0010, */ 0x3a, 0x20, 0x0d, 0x0a, 0x45, 0x72, 0x72, 0x6f, 0x72, 0x2d, 0x49, 0x6e, 0x66, 0x6f, 0x3a, 0x20, + /* -0020, */ 0x0d, 0x0a, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x3a, 0x20, 0x0d, 0x0a, 0x43, + /* -0030, */ 0x61, 0x6c, 0x6c, 0x2d, 0x49, 0x6e, 0x66, 0x6f, 0x3a, 0x20, 0x0d, 0x0a, 0x52, 0x65, 0x70, 0x6c, + /* -0040, */ 0x79, 0x2d, 0x54, 0x6f, 0x3a, 0x20, 0x0d, 0x0a, 0x57, 0x61, 0x72, 0x6e, 0x69, 0x6e, 0x67, 0x3a, + /* 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-0F80, */ 0xf4, 0x05, 0x10, 0x30, 0x04, 0x07, 0x1e, 0x08, 0x07, 0x1e, 0x05, 0x0b, 0x91, 0x10, 0x04, 0xca, + /* -0F90, */ 0x09, 0x0a, 0x71, 0x09, 0x0e, 0x87, 0x05, 0x04, 0x98, 0x05, 0x0b, 0x6e, 0x0b, 0x04, 0x9b, 0x0f, + /* -0FA0, */ 0x04, 0x9b, 0x07, 0x04, 0x9b, 0x03, 0x04, 0xa3, 0x07, 0x04, 0xa3, 0x10, 0x07, 0x98, 0x09, 0x07, + /* -0FB0, */ 0x98, 0x05, 0x0b, 0x73, 0x05, 0x0b, 0x78, 0x05, 0x0b, 0x7d, 0x05, 0x07, 0xb9, 0x05, 0x0b, 0x82, + /* -0FC0, */ 0x05, 0x0b, 0x87, 0x05, 0x0b, 0x1d, 0x05, 0x08, 0xe4, 0x05, 0x0c, 0x81, 0x05, 0x0f, 0x44, 0x05, + /* -0FD0, */ 0x11, 0x40, 0x05, 0x08, 0x78, 0x05, 0x08, 0x9d, 0x05, 0x0f, 0x58, 0x05, 0x07, 0x3f, 0x05, 0x0c, + /* -0FE0, */ 0x6d, 0x05, 0x10, 0xf2, 0x05, 0x0c, 0x58, 0x05, 0x06, 0xa9, 0x04, 0x07, 0xb6, 0x09, 0x05, 0x8c, + /* -0FF0, */ 0x06, 0x06, 0x1a, 0x06, 0x0e, 0x81, 0x0a, 0x06, 0x16, 0x0a, 0x0a, 0xc4, 0x07, 0x0b, 0x5a, 0x0a, + /* -1000, */ 0x0a, 0xba, 0x03, 0x0b, 0x1b, 0x04, 0x11, 0x45, 0x06, 0x0c, 0x8c, 0x07, 0x05, 0xad, 0x0a, 0x0e, + /* -1010, */ 0xda, 0x08, 0x0b, 0x42, 0x0d, 0x09, 0xf7, 0x0b, 0x05, 0x1c, 0x09, 0x11, 0x16, 0x08, 0x05, 0xc9, + /* -1020, */ 0x07, 0x0d, 0x86, 0x06, 0x0b, 0xcf, 0x0a, 0x06, 0x4d, 0x04, 0x0b, 0xa2, 0x06, 0x06, 0x8d, 0x08, + /* -1030, */ 0x05, 0xe6, 0x08, 0x0e, 0x11, 0x0b, 0x0a, 0x9b, 0x03, 0x0a, 0x04, 0x03, 0x0b, 0xb5, 0x05, 0x10, + /* -1040, */ 0xd7, 0x04, 0x09, 0x94, 0x05, 0x0a, 0xe2, 0x03, 0x0b, 0xb2, 0x06, 0x0d, 0x67, 0x04, 0x0d, 0x11, + /* -1050, */ 0x08, 0x08, 0xb7, 0x1b, 0x0e, 0x3b, 0x0a, 0x09, 0xa1, 0x14, 0x04, 0x85, 0x15, 0x07, 0x83, 0x15, + /* -1060, */ 0x07, 0x6e, 0x0d, 0x09, 0x3d, 0x17, 0x06, 0xae, 0x0f, 0x07, 0xe6, 0x14, 0x07, 0xbe, 0x0d, 0x06, + /* -1070, */ 0x0a, 0x0d, 0x09, 0x30, 0x16, 0x06, 0xf2, 0x12, 0x08, 0x1e, 0x21, 0x04, 0xaa, 0x13, 0x10, 0xc5, + /* -1080, */ 0x08, 0x0a, 0x0f, 0x1c, 0x0e, 0x96, 0x18, 0x0b, 0xb8, 0x1a, 0x05, 0x95, 0x1a, 0x05, 0x75, 0x11, + /* -1090, */ 0x06, 0x3d, 0x16, 0x06, 0xdc, 0x1e, 0x0e, 0x19, 0x16, 0x05, 0xd1, 0x1d, 0x06, 0x20, 0x23, 0x05, + /* -10A0, */ 0x27, 0x11, 0x08, 0x7d, 0x11, 0x0d, 0x99, 0x16, 0x04, 0xda, 0x0d, 0x0f, 0x1c, 0x16, 0x07, 0x08, + /* -10B0, */ 0x17, 0x05, 0xb4, 0x0d, 0x08, 0xc7, 0x13, 0x07, 0xf8, 0x12, 0x08, 0x57, 0x1f, 0x04, 0xfe, 0x19, + /* -10C0, */ 0x05, 0x4e, 0x13, 0x08, 0x0b, 0x0f, 0x08, 0xe9, 0x17, 0x06, 0xc5, 0x13, 0x06, 0x7b, 0x19, 0x05, + /* -10D0, */ 0xf1, 0x15, 0x07, 0x44, 0x18, 0x0d, 0xfb, 0x0b, 0x0f, 0x09, 0x1b, 0x0d, 0xbe, 0x12, 0x08, 0x30, + /* -10E0, */ 0x15, 0x07, 0x59, 0x04, 0x0b, 0xa6, 0x04, 0x0b, 0xae, 0x04, 0x0b, 0x9e, 0x04, 0x0b, 0x96, 0x04, + /* -10F0, */ 0x0b, 0x9a, 0x0a, 0x0a, 0xb0, 0x0b, 0x0a, 0x90, 0x08, 0x0b, 0x32, 0x0b, 0x09, 0x6b, 0x08, 0x0b, + /* -1100, */ 0x2a, 0x0b, 0x0a, 0x85, 0x09, 0x0b, 0x12, 0x0a, 0x0a, 0xa6, 0x0d, 0x09, 0xea, 0x13, 0x0d, 0x74, + /* -1110, */ 0x14, 0x07, 0xd2, 0x13, 0x09, 0x0b, 0x12, 0x08, 0x42, 0x10, 0x09, 0x5b, 0x12, 0x09, 0x1e, 0x0d, + /* -1120, */ 0x0c, 0xb1, 0x0e, 0x0c, 0x17, 0x11, 0x09, 0x4a, 0x0c, 0x0a, 0x53, 0x0c, 0x0a, 0x47, 0x09, 0x0a, + /* -1130, */ 0xf7, 0x0e, 0x09, 0xc7, 0x0c, 0x0a, 0x3b, 0x07, 0x06, 0x69, 0x08, 0x06, 0x69, 0x06, 0x09, 0xe3, + /* -1140, */ 0x08, 0x0b, 0x52, 0x0a, 0x0a, 0xd8, 0x12, 0x06, 0x57, 0x0d, 0x06, 0x57, 0x07, 0x09, 0xe3, 0x04, + /* -1150, */ 0x0a, 0xe9, 0x10, 0x07, 0x30, 0x09, 0x0b, 0x00, 0x0c, 0x0a, 0x2f, 0x05, 0x0a, 0xe9, 0x05, 0x0a, + /* -1160, */ 0x6b, 0x06, 0x0a, 0x6b, 0x0a, 0x0a, 0xce, 0x09, 0x0a, 0xee, 0x03, 0x0b, 0xdb, 0x07, 0x0f, 0x7e, + /* -1170, */ 0x0a, 0x09, 0x97, 0x0a, 0x06, 0x71, 0x0e, 0x09, 0xd5, 0x17, 0x06, 0x93, 0x07, 0x0e, 0x5c, 0x07, + /* -1180, */ 0x0f, 0xda, 0x0a, 0x0f, 0x35, 0x0d, 0x0d, 0xec, 0x0a, 0x09, 0x97, 0x0a, 0x06, 0x71, 0x08, 0x0b, + /* -1190, */ 0x22, 0x0f, 0x09, 0x85, 0x06, 0x0b, 0x68, 0x0c, 0x0d, 0x4a, 0x09, 0x0b, 0x09, 0x13, 0x08, 0xf8, + /* -11A0, */ 0x15, 0x08, 0xa2, 0x04, 0x0b, 0xaa, 0x0f, 0x05, 0x66, 0x0d, 0x07, 0x23, 0x09, 0x0a, 0x06, 0x0b, + /* -11B0, */ 0x0d, 0x4a, 0x0f, 0x04, 0xee, 0x06, 0x04, 0xf8, 0x04, 0x09, 0x2b, 0x04, 0x08, 0x53, 0x07, 0x08, + /* -11C0, */ 0xc0, 0x03, 0x11, 0x1f, 0x04, 0x11, 0x1e, 0x07, 0x0d, 0x8c, 0x03, 0x07, 0x34, 0x04, 0x10, 0xdb, + /* -11D0, */ 0x03, 0x07, 0x36, 0x03, 0x0d, 0xa9, 0x0d, 0x04, 0x20, 0x0b, 0x04, 0x51, 0x0c, 0x04, 0x3a, 0x04, + /* -11E0, */ 0x0b, 0xb8, 0x04, 0x0c, 0x24, 0x04, 0x05, 0x95, 0x04, 0x04, 0x7c, 0x04, 0x05, 0x75, 0x04, 0x04, + /* -11F0, */ 0x85, 0x04, 0x09, 0x6b, 0x04, 0x06, 0x3d, 0x06, 0x04, 0x7b, 0x04, 0x06, 0xdc, 0x04, 0x07, 0x83, + /* -1200, */ 0x04, 0x0e, 0x19, 0x12, 0x04, 0x00, 0x10, 0x08, 0x8e, 0x10, 0x08, 0x69, 0x0e, 0x04, 0x12, 0x0d, + /* -1210, */ 0x04, 0x2d, 0x03, 0x10, 0xb9, 0x04, 0x05, 0xd1, 0x04, 0x07, 0x6e, 0x04, 0x06, 0x20, 0x07, 0x04, + /* -1220, */ 0x74, 0x04, 0x0b, 0xfc, 0x0a, 0x04, 0x5c, 0x04, 0x05, 0x27, 0x04, 0x09, 0x3d, 0x04, 0x08, 0x7d, + /* -1230, */ 0x04, 0x0f, 0xae, 0x04, 0x0d, 0x99, 0x04, 0x06, 0xae, 0x04, 0x04, 0xda, 0x09, 0x04, 0x09, 0x08, + /* -1240, */ 0x11, 0x22, 0x04, 0x0f, 0x1c, 0x04, 0x07, 0xe6, 0x04, 0x0e, 0xcb, 0x05, 0x08, 0xbd, 0x04, 0x07, + /* -1250, */ 0x08, 0x04, 0x0f, 0xa3, 0x04, 0x06, 0x57, 0x04, 0x05, 0xb4, 0x04, 0x0f, 0x5d, 0x04, 0x08, 0xc7, + /* -1260, */ 0x08, 0x0b, 0xf4, 0x04, 0x07, 0xf8, 0x04, 0x07, 0x30, 0x04, 0x07, 0xbe, 0x04, 0x08, 0x57, 0x05, + /* -1270, */ 0x0d, 0x46, 0x04, 0x04, 0xfe, 0x04, 0x06, 0x0a, 0x04, 0x05, 0x4e, 0x04, 0x0e, 0x3b, 0x04, 0x08, + /* -1280, */ 0x0b, 0x04, 0x09, 0x30, 0x04, 0x08, 0xe9, 0x05, 0x05, 0xee, 0x04, 0x06, 0xc5, 0x04, 0x06, 0xf2, + /* -1290, */ 0x04, 0x06, 0x7b, 0x04, 0x09, 0xa1, 0x04, 0x05, 0xf1, 0x04, 0x08, 0x1e, 0x04, 0x07, 0x44, 0x04, + /* -12A0, */ 0x0b, 0xdd, 0x04, 0x0d, 0xfb, 0x04, 0x04, 0xaa, 0x04, 0x0b, 0xe3, 0x07, 0x0e, 0xee, 0x04, 0x0f, + /* -12B0, */ 0x09, 0x04, 0x0e, 0xb4, 0x04, 0x0d, 0xbe, 0x04, 0x10, 0xc5, 0x04, 0x08, 0x30, 0x05, 0x0f, 0x30, + /* -12C0, */ 0x04, 0x07, 0x59, 0x04, 0x0a, 0x0f, 0x06, 0x0e, 0x61, 0x04, 0x04, 0x81, 0x04, 0x0d, 0xab, 0x04, + /* -12D0, */ 0x0d, 0x93, 0x04, 0x11, 0x6b, 0x04, 0x0e, 0x96, 0x05, 0x04, 0x66, 0x09, 0x04, 0x6b, 0x0b, 0x04, + /* -12E0, */ 0x46, 0x04, 0x0c, 0xe1 + +}; + +/* + * Definitions for: + * The Presence-Specific Static Dictionary for Signaling + * http://www.ietf.org/rfc/rfc5112.txt?number=5112 + */ +#define PRESENCE_STATE_LENGTH 0x0d93 + +static const guint8 presence_state_identifier[STATE_BUFFER_SIZE] = +{ + /* -0000, */ 0xd9, 0x42, 0x29, 0x7d, 0x0b, 0xb3, 0x8f, 0xc0, 0x1d, 0x67, 0x41, 0xd6, 0xb3, 0xb4, 0x81, 0x57, + /* -0010, */ 0xac, 0x8e, 0x1b, 0xe0 +}; + +static const guint8 presence_static_dictionary_for_sigcomp[PRESENCE_STATE_LENGTH] = +{ + /* -0000, */ 0x63, 0x6f, 0x6e, 0x76, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2d, 0x63, 0x65, 0x6e, 0x74, 0x65, + /* -0010, */ 0x72, 0x6d, 0x69, 0x6e, 0x61, 0x74, 0x65, 0x64, 0x65, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, + /* -0020, */ 0x69, 0x73, 0x67, 0x75, 0x73, 0x74, 0x65, 0x64, 0x69, 0x6e, 0x64, 0x75, 0x73, 0x74, 0x72, 0x69, + /* -0030, */ 0x61, 0x6c, 0x61, 0x73, 0x74, 0x2d, 0x69, 0x6e, 0x70, 0x75, 0x74, 0x3d, 0x68, 0x75, 0x6d, 0x69, + /* -0040, */ 0x6c, 0x69, 0x61, 0x74, 0x65, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x3d, 0x61, 0x75, 0x74, 0x6f, + /* -0050, */ 0x6d, 0x6f, 0x62, 0x69, 0x6c, 0x65, 0x63, 0x75, 0x72, 0x69, 0x6f, 0x75, 0x73, 0x70, 0x69, 0x72, + /* -0060, */ 0x69, 0x74, 0x73, 0x2d, 0x49, 0x4e, 0x44, 0x50, 0x73, 0x65, 0x6e, 0x64, 0x2d, 0x6f, 0x6e, 0x6c, + /* -0070, */ 0x79, 0x70, 0x61, 0x74, 0x68, 0x65, 0x61, 0x74, 0x65, 0x72, 0x65, 0x73, 0x74, 0x6c, 0x65, 0x73, + /* -0080, */ 0x73, 0x6c, 0x65, 0x65, 0x70, 0x79, 0x69, 0x6e, 0x2d, 0x70, 0x65, 0x72, 0x73, 0x6f, 0x6e, 0x61, + /* -0090, */ 0x6c, 0x6f, 0x6e, 0x65, 0x6c, 0x79, 0x70, 0x6c, 0x61, 0x79, 0x66, 0x75, 0x6c, 0x6f, 0x77, 0x65, + /* -00A0, */ 0x72, 0x74, 0x68, 0x61, 0x6e, 0x6e, 0x6f, 0x79, 0x65, 0x64, 0x75, 0x6e, 0x63, 0x6f, 0x6d, 0x66, + /* -00B0, */ 0x6f, 0x72, 0x74, 0x61, 0x62, 0x6c, 0x65, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x3d, 0x63, 0x6f, + /* -00C0, */ 0x6e, 0x66, 0x75, 0x73, 0x65, 0x64, 0x76, 0x61, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x63, 0x6c, + /* -00D0, */ 0x75, 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0x05, 0x84, 0x05, 0x09, 0x7a, 0x05, 0x06, 0x01, 0x09, 0x09, 0x12, 0x04, 0x09, 0x52, 0x0d, + /* -0B90, */ 0x04, 0xaa, 0x0d, 0x08, 0x56, 0x08, 0x04, 0xdc, 0x07, 0x05, 0x92, 0x05, 0x05, 0x0c, 0x0a, 0x04, + /* -0BA0, */ 0x4c, 0x04, 0x06, 0x2c, 0x0b, 0x04, 0xd1, 0x04, 0x06, 0x24, 0x09, 0x0c, 0x40, 0x04, 0x04, 0xce, + /* -0BB0, */ 0x0c, 0x08, 0xc1, 0x11, 0x04, 0x00, 0x05, 0x07, 0x34, 0x0a, 0x06, 0x6a, 0x08, 0x0d, 0x28, 0x05, + /* -0BC0, */ 0x06, 0x1a, 0x0a, 0x04, 0x28, 0x07, 0x0a, 0xfe, 0x06, 0x04, 0xff, 0x08, 0x09, 0x94, 0x07, 0x05, + /* -0BD0, */ 0x76, 0x10, 0x08, 0x98, 0x06, 0x05, 0xf0, 0x06, 0x09, 0x03, 0x10, 0x09, 0x03, 0x09, 0x08, 0x1e, + /* -0BE0, */ 0x0a, 0x08, 0x3c, 0x06, 0x09, 0x9b, 0x0d, 0x0c, 0xbb, 0x07, 0x06, 0xe3, 0x05, 0x09, 0xcc, 0x06, + /* -0BF0, */ 0x0a, 0x15, 0x07, 0x04, 0x73, 0x05, 0x06, 0x73, 0x0d, 0x06, 0x73, 0x05, 0x08, 0x45, 0x08, 0x0a, + /* -0C00, */ 0x29, 0x09, 0x0a, 0x40, 0x05, 0x07, 0x1a, 0x0a, 0x07, 0x1a, 0x09, 0x0b, 0x4f, 0x09, 0x0c, 0xdb, + /* -0C10, */ 0x06, 0x05, 0xea, 0x06, 0x05, 0xde, 0x0a, 0x04, 0x0e, 0x0a, 0x0b, 0x0e, 0x09, 0x06, 0x86, 0x08, + /* -0C20, */ 0x05, 0x60, 0x0b, 0x07, 0x74, 0x09, 0x05, 0x4f, 0x08, 0x04, 0xf0, 0x07, 0x09, 0x90, 0x06, 0x08, + /* -0C30, */ 0x70, 0x0a, 0x0c, 0x21, 0x07, 0x05, 0x6f, 0x0b, 0x0c, 0xcc, 0x04, 0x07, 0x90, 0x07, 0x04, 0xea, + /* -0C40, */ 0x0a, 0x08, 0x33, 0x04, 0x06, 0x34, 0x09, 0x06, 0xdc, 0x04, 0x06, 0x40, 0x07, 0x05, 0x2e, 0x04, + /* -0C50, */ 0x06, 0x48, 0x06, 0x07, 0x87, 0x07, 0x05, 0x68, 0x0a, 0x0d, 0x1a, 0x07, 0x04, 0x45, 0x07, 0x05, + /* -0C60, */ 0x05, 0x08, 0x05, 0x0e, 0x08, 0x05, 0x58, 0x08, 0x04, 0xb6, 0x10, 0x09, 0xf8, 0x04, 0x06, 0x3c, + /* -0C70, */ 0x07, 0x09, 0xbc, 0x0c, 0x06, 0xd0, 0x0c, 0x0b, 0xe7, 0x04, 0x06, 0x44, 0x04, 0x0a, 0x31, 0x0b, + /* -0C80, */ 0x0c, 0x05, 0x04, 0x06, 0x28, 0x11, 0x07, 0x5a, 0x07, 0x0c, 0xc5, 0x07, 0x05, 0xa0, 0x0c, 0x09, + /* -0C90, */ 0x6f, 0x08, 0x0c, 0xbb, 0x08, 0x0a, 0x76, 0x09, 0x08, 0x16, 0x08, 0x08, 0x69, 0x06, 0x05, 0xe4, + /* -0CA0, */ 0x09, 0x04, 0x86, 0x07, 0x05, 0x38, 0x06, 0x0a, 0x4f, 0x08, 0x04, 0xc6, 0x0f, 0x08, 0xf4, 0x0b, + /* -0CB0, */ 0x04, 0x31, 0x07, 0x0a, 0x04, 0x07, 0x08, 0xa1, 0x0d, 0x0c, 0x55, 0x06, 0x05, 0xc0, 0x06, 0x05, + /* -0CC0, */ 0xba, 0x05, 0x05, 0x41, 0x08, 0x0b, 0x87, 0x08, 0x04, 0x89, 0x04, 0x05, 0x35, 0x0c, 0x0a, 0x5a, + /* -0CD0, */ 0x09, 0x04, 0x68, 0x09, 0x04, 0x9c, 0x0a, 0x06, 0xba, 0x06, 0x07, 0x0d, 0x05, 0x07, 0x25, 0x09, + /* -0CE0, */ 0x0b, 0x9d, 0x09, 0x0a, 0x69, 0x06, 0x0a, 0x6c, 0x04, 0x06, 0x38, 0x04, 0x06, 0x30, 0x07, 0x0d, + /* -0CF0, */ 0x13, 0x08, 0x08, 0x4c, 0x05, 0x06, 0x15, 0x06, 0x04, 0x50, 0x0a, 0x07, 0x04, 0x06, 0x07, 0xf7, + /* -0D00, */ 0x04, 0x08, 0x49, 0x0f, 0x08, 0x89, 0x0c, 0x09, 0x3f, 0x05, 0x06, 0x81, 0x11, 0x08, 0xdc, 0x0d, + /* -0D10, */ 0x04, 0x5c, 0x11, 0x06, 0x5a, 0x05, 0x0d, 0x0e, 0x06, 0x05, 0xd8, 0x04, 0x08, 0xd3, 0x06, 0x05, + /* -0D20, */ 0xd2, 0x07, 0x05, 0x7d, 0x06, 0x05, 0xcc, 0x07, 0x08, 0xd6, 0x05, 0x06, 0x0b, 0x07, 0x05, 0xa7, + /* -0D30, */ 0x05, 0x05, 0x16, 0x08, 0x05, 0x1a, 0x09, 0x05, 0x46, 0x06, 0x05, 0xc6, 0x06, 0x09, 0x31, 0x0d, + /* -0D40, */ 0x0b, 0xcf, 0x09, 0x08, 0x62, 0x08, 0x04, 0xf8, 0x04, 0x08, 0x54, 0x0a, 0x06, 0x7f, 0x04, 0x04, + /* -0D50, */ 0x71, 0x0c, 0x0c, 0x16, 0x04, 0x05, 0x2e, 0x08, 0x0b, 0x3f, 0x11, 0x0c, 0x23, 0x08, 0x0c, 0x7b, + /* -0D60, */ 0x09, 0x0b, 0xc7, 0x07, 0x07, 0xf6, 0x05, 0x0b, 0x3b, 0x09, 0x08, 0x75, 0x09, 0x0c, 0x81, 0x09, + /* -0D70, */ 0x06, 0xe9, 0x0b, 0x09, 0xb0, 0x07, 0x05, 0x22, 0x07, 0x04, 0xa3, 0x07, 0x06, 0xc2, 0x07, 0x05, + /* -0D80, */ 0x99, 0x05, 0x06, 0x06, 0x05, 0x05, 0xfc, 0x04, 0x09, 0xc3, 0x04, 0x06, 0x4c, 0x08, 0x04, 0xbe, + /* -0D90, */ 0x09, 0x0b, 0x2a +}; + +static GHashTable *state_buffer_table=NULL; + + static void -sigcomp_init_protocol(void) +sigcomp_init_udvm(void){ + + gchar *partial_state_str; + guint8 *sip_sdp_buff, *presence_buff; + + /* Destroy any existing memory chunks / hashes. */ + if (state_buffer_table){ + g_hash_table_destroy(state_buffer_table); + } + + + state_buffer_table = g_hash_table_new_full(g_str_hash, + g_str_equal, + g_free, /* key_destroy_func */ + g_free); /* value_destroy_func */ + /* + * Store static dictionaries in hash table + */ + sip_sdp_buff = (guint8 *)g_malloc(SIP_SDP_STATE_LENGTH + 8); + + partial_state_str = bytes_to_str(NULL, sip_sdp_state_identifier, 6); + + /* + * Debug g_warning("Sigcomp init: Storing partial state =%s",partial_state_str); + */ + memset(sip_sdp_buff, 0, 8); + sip_sdp_buff[0] = SIP_SDP_STATE_LENGTH >> 8; + sip_sdp_buff[1] = SIP_SDP_STATE_LENGTH & 0xff; + memcpy(sip_sdp_buff+8, sip_sdp_static_dictionaty_for_sigcomp, SIP_SDP_STATE_LENGTH); + + g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), sip_sdp_buff); + wmem_free(NULL, partial_state_str); + /* Debug + * g_warning("g_hash_table_insert = 0x%x",sip_sdp_buff); + * g_warning("g_hash_table_insert = 0x%x",sip_sdp_buff); + */ + + presence_buff = (guint8 *)g_malloc(PRESENCE_STATE_LENGTH + 8); + + partial_state_str = bytes_to_str(NULL, presence_state_identifier, 6); + + memset(presence_buff, 0, 8); + presence_buff[0] = PRESENCE_STATE_LENGTH >> 8; + presence_buff[1] = PRESENCE_STATE_LENGTH & 0xff; + memcpy(presence_buff+8, presence_static_dictionary_for_sigcomp, PRESENCE_STATE_LENGTH); + + g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), presence_buff); + wmem_free(NULL, partial_state_str); +} + + +static int udvm_state_access(tvbuff_t *tvb, proto_tree *tree,guint8 *buff,guint16 p_id_start, guint16 p_id_length, guint16 state_begin, guint16 *state_length, + guint16 *state_address, guint16 *state_instruction, + gint hf_id) { - sigcomp_init_udvm(); + int result_code = 0; + guint32 n; + guint16 k; + guint16 buf_size_real; + guint16 byte_copy_right; + guint16 byte_copy_left; + char partial_state[STATE_BUFFER_SIZE]; /* Size is 6 - 20 */ + guint8 *state_buff; + gchar *partial_state_str; + + /* + * Perform initial checks on validity of data + * RFC 3320 : + * 9.4.5. STATE-ACCESS + * : + * Decompression failure occurs if partial_identifier_length does not + * lie between 6 and 20 inclusive. Decompression failure also occurs if + * no state item matching the partial state identifier can be found, if + * more than one state item matches the partial identifier, or if + * partial_identifier_length is less than the minimum_access_length of + * the matched state item. Otherwise, a state item is returned from the + * state handler. + */ + + if (( p_id_length < STATE_MIN_ACCESS_LEN ) || ( p_id_length > STATE_BUFFER_SIZE )){ + result_code = 1; + return result_code; + } + + n = 0; + while ( n < p_id_length && n < STATE_BUFFER_SIZE && p_id_start + n < UDVM_MEMORY_SIZE ){ + partial_state[n] = buff[p_id_start + n]; + n++; + } + partial_state_str = bytes_to_str(wmem_packet_scope(), partial_state, p_id_length); + proto_tree_add_text(tree,tvb, 0, -1,"### Accessing state ###"); + proto_tree_add_string(tree,hf_id, tvb, 0, 0, partial_state_str); + + /* Debug + * g_warning("State Access: partial state =%s",partial_state_str); + * g_warning("g_hash_table_lookup = 0x%x",state_buff); + * g_warning("State Access: partial state =%s",partial_state_str); + */ + state_buff = (guint8 *)g_hash_table_lookup(state_buffer_table, partial_state_str); + if ( state_buff == NULL ){ + result_code = 2; /* No state match */ + return result_code; + } + /* + * sip_sdp_static_dictionaty + * + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + /* + * buff = Where "state" will be stored + * p_id_start = Partial state identifier start pos in the buffer(buff) + * p-id_length = Partial state identifier length + * state_begin = Where to start to read state from + * state_length = Length of state + * state_address = Address where to store the state in the buffer(buff) + * state_instruction = + * FALSE = Indicates that state_* is in the stored state + */ + + buf_size_real = (state_buff[0] << 8) | state_buff[1]; + + /* + * The value of + * state_length MUST be taken from the returned item of state in the + * case that the state_length operand is set to 0. + * + * The same is true of state_address, state_instruction. + */ + if (*state_length == 0) { + *state_length = buf_size_real; + } + if ( *state_address == 0 ){ + *state_address = state_buff[2] << 8; + *state_address = *state_address | state_buff[3]; + } + if ( *state_instruction == 0 ){ + *state_instruction = state_buff[4] << 8; + *state_instruction = *state_instruction | state_buff[5]; + } + + /* + * Decompression failure occurs if bytes are copied from beyond the end of + * the state_value. + */ + if ((state_begin + *state_length) > buf_size_real) { + return 3; + } + + /* + * Note that decompression failure will always occur if the state_length + * operand is set to 0 but the state_begin operand is non-zero. + */ + if (*state_length == 0 && state_begin != 0) { + return 17; + } + + n = state_begin + 8; + k = *state_address; + + /* + * NOTE: Strictly speaking, byte_copy_left and byte_copy_right should + * not be used if this has been called for bytecode referenced in + * the message header. However, since the memory is initialised + * to zero, the code works OK. + */ + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + /* debug + *g_warning(" state_begin %u state_address %u",state_begin , *state_address); + */ + while ( (gint32) n < (state_begin + *state_length + 8) && n < UDVM_MEMORY_SIZE ){ + buff[k] = state_buff[n]; + /* debug + g_warning(" Loading 0x%x at address %u",buff[k] , k); + */ + k = ( k + 1 ) & 0xffff; + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + n++; + } + return 0; + /* + * End SIP + */ + +} + +static void udvm_state_create(guint8 *state_buff,guint8 *state_identifier,guint16 p_id_length){ + + char partial_state[STATE_BUFFER_SIZE]; + guint i; + gchar *partial_state_str; + gchar *dummy_buff; + /* + * Debug + g_warning("Received items of state,state_length_buff[0]= %u, state_length_buff[1]= %u", + state_length_buff[0],state_length_buff[1]); + + */ + i = 0; + while ( i < p_id_length && i < STATE_BUFFER_SIZE ){ + partial_state[i] = state_identifier[i]; + i++; + } + partial_state_str = bytes_to_str(NULL, partial_state, p_id_length); + + dummy_buff = (gchar *)g_hash_table_lookup(state_buffer_table, partial_state_str); + if ( dummy_buff == NULL ){ + g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), state_buff); + }else{ + /* The buffer allocated by sigcomp-udvm.c wasen't needed so free it + */ + g_free(state_buff); + + } + wmem_free(NULL, partial_state_str); +} + +#if 1 +static void udvm_state_free(guint8 buff[] _U_,guint16 p_id_start _U_,guint16 p_id_length _U_){ } +#else +void udvm_state_free(guint8 buff[],guint16 p_id_start,guint16 p_id_length){ + char partial_state[STATE_BUFFER_SIZE]; + guint i; + gchar *partial_state_str; + + gchar *dummy_buff; + + i = 0; + while ( i < p_id_length && i < STATE_BUFFER_SIZE && p_id_start + i < UDVM_MEMORY_SIZE ){ + partial_state[i] = buff[p_id_start + i]; + i++; + } + partial_state_str = bytes_to_str(NULL, partial_state, p_id_length); + /* TODO Implement a state create counter before actually freeing states + * Hmm is it a good idea to free the buffer at all? + */ + g_warning("State-free on %s ",partial_state_str); + dummy_buff = g_hash_table_lookup(state_buffer_table, partial_state_str); + if ( dummy_buff == NULL ){ + g_warning("State-free, state not found %s",partial_state_str); + }else{ + g_hash_table_remove (state_buffer_table, partial_state_str); + g_free(dummy_buff); + } + wmem_free(NULL, partial_state_str); +} +#endif + +/********************************************************************************************** + * + * SIGCOMP DECOMPRESSION + * + **********************************************************************************************/ +#define SIGCOMP_INSTR_DECOMPRESSION_FAILURE 0 +#define SIGCOMP_INSTR_AND 1 +#define SIGCOMP_INSTR_OR 2 +#define SIGCOMP_INSTR_NOT 3 +#define SIGCOMP_INSTR_LSHIFT 4 +#define SIGCOMP_INSTR_RSHIFT 5 +#define SIGCOMP_INSTR_ADD 6 +#define SIGCOMP_INSTR_SUBTRACT 7 +#define SIGCOMP_INSTR_MULTIPLY 8 +#define SIGCOMP_INSTR_DIVIDE 9 +#define SIGCOMP_INSTR_REMAINDER 10 +#define SIGCOMP_INSTR_SORT_ASCENDING 11 +#define SIGCOMP_INSTR_SORT_DESCENDING 12 +#define SIGCOMP_INSTR_SHA_1 13 +#define SIGCOMP_INSTR_LOAD 14 +#define SIGCOMP_INSTR_MULTILOAD 15 +#define SIGCOMP_INSTR_PUSH 16 +#define SIGCOMP_INSTR_POP 17 +#define SIGCOMP_INSTR_COPY 18 +#define SIGCOMP_INSTR_COPY_LITERAL 19 +#define SIGCOMP_INSTR_COPY_OFFSET 20 +#define SIGCOMP_INSTR_MEMSET 21 +#define SIGCOMP_INSTR_JUMP 22 +#define SIGCOMP_INSTR_COMPARE 23 +#define SIGCOMP_INSTR_CALL 24 +#define SIGCOMP_INSTR_RETURN 25 +#define SIGCOMP_INSTR_SWITCH 26 +#define SIGCOMP_INSTR_CRC 27 +#define SIGCOMP_INSTR_INPUT_BYTES 28 +#define SIGCOMP_INSTR_INPUT_BITS 29 +#define SIGCOMP_INSTR_INPUT_HUFFMAN 30 +#define SIGCOMP_INSTR_STATE_ACCESS 31 +#define SIGCOMP_INSTR_STATE_CREATE 32 +#define SIGCOMP_INSTR_STATE_FREE 33 +#define SIGCOMP_INSTR_OUTPUT 34 +#define SIGCOMP_INSTR_END_MESSAGE 35 + + +static gboolean print_level_1; +static gboolean print_level_2; +static gboolean print_level_3; +static gint show_instr_detail_level; + +/* Internal result code values of decompression failures */ +static const value_string result_code_vals[] = { + { 0, "No decompression failure" }, + { 1, "Partial state length less than 6 or greater than 20 bytes long" }, + { 2, "No state match" }, + { 3, "state_begin + state_length > size of state" }, + { 4, "Operand_2 is Zero" }, + { 5, "Switch statement failed j >= n" }, + { 6, "Attempt to jump outside of UDVM memory" }, + { 7, "L in input-bits > 16" }, + { 8, "input_bit_order > 7" }, + { 9, "Instruction Decompression failure encountered" }, + {10, "Input huffman failed j > n" }, + {11, "Input bits requested beyond end of message" }, + {12, "more than four state creation requests are made before the END-MESSAGE instruction" }, + {13, "state_retention_priority is 65535" }, + {14, "Input bytes requested beyond end of message" }, + {15, "Maximum number of UDVM cycles reached" }, + {16, "UDVM stack underflow" }, + {17, "state_length is 0, but state_begin is non-zero" }, + { 255, "This branch isn't coded yet" }, + { 0, NULL } +}; + + /* The simplest operand type is the literal (#), which encodes a + * constant integer from 0 to 65535 inclusive. A literal operand may + * require between 1 and 3 bytes depending on its value. + * Bytecode: Operand value: Range: + * 0nnnnnnn N 0 - 127 + * 10nnnnnn nnnnnnnn N 0 - 16383 + * 11000000 nnnnnnnn nnnnnnnn N 0 - 65535 + * + * Figure 8: Bytecode for a literal (#) operand + * + */ +static int +decode_udvm_literal_operand(guint8 *buff,guint operand_address, guint16 *value) +{ + guint bytecode; + guint16 operand; + guint test_bits; + guint offset = operand_address; + guint8 temp_data; + + bytecode = buff[operand_address]; + test_bits = bytecode >> 7; + if (test_bits == 1){ + test_bits = bytecode >> 6; + if (test_bits == 2){ + /* + * 10nnnnnn nnnnnnnn N 0 - 16383 + */ + temp_data = buff[operand_address] & 0x1f; + operand = temp_data << 8; + temp_data = buff[(operand_address + 1) & 0xffff]; + operand = operand | temp_data; + *value = operand; + offset = offset + 2; + + }else{ + /* + * 111000000 nnnnnnnn nnnnnnnn N 0 - 65535 + */ + offset ++; + temp_data = buff[operand_address] & 0x1f; + operand = temp_data << 8; + temp_data = buff[(operand_address + 1) & 0xffff]; + operand = operand | temp_data; + *value = operand; + offset = offset + 2; + + } + }else{ + /* + * 0nnnnnnn N 0 - 127 + */ + operand = ( bytecode & 0x7f); + *value = operand; + offset ++; + } + + return offset; + +} + +/* + * The second operand type is the reference ($), which is always used to + * access a 2-byte value located elsewhere in the UDVM memory. The + * bytecode for a reference operand is decoded to be a constant integer + * from 0 to 65535 inclusive, which is interpreted as the memory address + * containing the actual value of the operand. + * Bytecode: Operand value: Range: + * + * 0nnnnnnn memory[2 * N] 0 - 65535 + * 10nnnnnn nnnnnnnn memory[2 * N] 0 - 65535 + * 11000000 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 + * + * Figure 9: Bytecode for a reference ($) operand + */ +static int +dissect_udvm_reference_operand_memory(guint8 *buff,guint operand_address, guint16 *value,guint *result_dest) +{ + guint bytecode; + guint16 operand; + guint offset = operand_address; + guint test_bits; + guint8 temp_data; + guint16 temp_data16; + + bytecode = buff[operand_address]; + test_bits = bytecode >> 7; + if (test_bits == 1){ + test_bits = bytecode >> 6; + if (test_bits == 2){ + /* + * 10nnnnnn nnnnnnnn memory[2 * N] 0 - 65535 + */ + temp_data = buff[operand_address] & 0x3f; + operand = temp_data << 8; + temp_data = buff[(operand_address + 1) & 0xffff]; + operand = operand | temp_data; + operand = (operand * 2); + *result_dest = operand; + temp_data16 = buff[operand] << 8; + temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; + *value = temp_data16; + offset = offset + 2; + + }else{ + /* + * 11000000 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 + */ + operand_address++; + operand = buff[operand_address] << 8; + operand = operand | buff[(operand_address + 1) & 0xffff]; + *result_dest = operand; + temp_data16 = buff[operand] << 8; + temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; + *value = temp_data16; + offset = offset + 3; + + } + }else{ + /* + * 0nnnnnnn memory[2 * N] 0 - 65535 + */ + operand = ( bytecode & 0x7f); + operand = (operand * 2); + *result_dest = operand; + temp_data16 = buff[operand] << 8; + temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; + *value = temp_data16; + offset ++; + } + + if (offset >= UDVM_MEMORY_SIZE || *result_dest >= UDVM_MEMORY_SIZE - 1 ) + THROW(ReportedBoundsError); + + return offset; +} + + /* RFC3320 + * Figure 10: Bytecode for a multitype (%) operand + * Bytecode: Operand value: Range: HEX val + * 00nnnnnn N 0 - 63 0x00 + * 01nnnnnn memory[2 * N] 0 - 65535 0x40 + * 1000011n 2 ^ (N + 6) 64 , 128 0x86 + * 10001nnn 2 ^ (N + 8) 256 , ... , 32768 0x88 + * 111nnnnn N + 65504 65504 - 65535 0xe0 + * 1001nnnn nnnnnnnn N + 61440 61440 - 65535 0x90 + * 101nnnnn nnnnnnnn N 0 - 8191 0xa0 + * 110nnnnn nnnnnnnn memory[N] 0 - 65535 0xc0 + * 10000000 nnnnnnnn nnnnnnnn N 0 - 65535 0x80 + * 10000001 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 0x81 + */ +static int +decode_udvm_multitype_operand(guint8 *buff,guint operand_address, guint16 *value) +{ + guint test_bits; + guint bytecode; + guint offset = operand_address; + guint16 operand; + guint32 result; + guint8 temp_data; + guint16 temp_data16; + guint16 memmory_addr = 0; + + *value = 0; + + bytecode = buff[operand_address]; + test_bits = ( bytecode & 0xc0 ) >> 6; + switch (test_bits ){ + case 0: + /* + * 00nnnnnn N 0 - 63 + */ + operand = buff[operand_address]; + /* debug + *g_warning("Reading 0x%x From address %u",operand,offset); + */ + *value = operand; + offset ++; + break; + case 1: + /* + * 01nnnnnn memory[2 * N] 0 - 65535 + */ + memmory_addr = ( bytecode & 0x3f) * 2; + temp_data16 = buff[memmory_addr] << 8; + temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; + *value = temp_data16; + offset ++; + break; + case 2: + /* Check tree most significant bits */ + test_bits = ( bytecode & 0xe0 ) >> 5; + if ( test_bits == 5 ){ + /* + * 101nnnnn nnnnnnnn N 0 - 8191 + */ + temp_data = buff[operand_address] & 0x1f; + operand = temp_data << 8; + temp_data = buff[(operand_address + 1) & 0xffff]; + operand = operand | temp_data; + *value = operand; + offset = offset + 2; + }else{ + test_bits = ( bytecode & 0xf0 ) >> 4; + if ( test_bits == 9 ){ + /* + * 1001nnnn nnnnnnnn N + 61440 61440 - 65535 + */ + temp_data = buff[operand_address] & 0x0f; + operand = temp_data << 8; + temp_data = buff[(operand_address + 1) & 0xffff]; + operand = operand | temp_data; + operand = operand + 61440; + *value = operand; + offset = offset + 2; + }else{ + test_bits = ( bytecode & 0x08 ) >> 3; + if ( test_bits == 1){ + /* + * 10001nnn 2 ^ (N + 8) 256 , ... , 32768 + */ + + result = 1 << ((buff[operand_address] & 0x07) + 8); + operand = result & 0xffff; + *value = operand; + offset ++; + }else{ + test_bits = ( bytecode & 0x0e ) >> 1; + if ( test_bits == 3 ){ + /* + * 1000 011n 2 ^ (N + 6) 64 , 128 + */ + result = 1 << ((buff[operand_address] & 0x01) + 6); + operand = result & 0xffff; + *value = operand; + offset ++; + }else{ + /* + * 1000 0000 nnnnnnnn nnnnnnnn N 0 - 65535 + * 1000 0001 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 + */ + offset ++; + temp_data16 = buff[(operand_address + 1) & 0xffff] << 8; + temp_data16 = temp_data16 | buff[(operand_address + 2) & 0xffff]; + /* debug + * g_warning("Reading 0x%x From address %u",temp_data16,operand_address); + */ + if ( (bytecode & 0x01) == 1 ){ + memmory_addr = temp_data16; + temp_data16 = buff[memmory_addr] << 8; + temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; + } + *value = temp_data16; + offset = offset +2; + } + + + } + } + } + break; + + case 3: + test_bits = ( bytecode & 0x20 ) >> 5; + if ( test_bits == 1 ){ + /* + * 111nnnnn N + 65504 65504 - 65535 + */ + operand = ( buff[operand_address] & 0x1f) + 65504; + *value = operand; + offset ++; + }else{ + /* + * 110nnnnn nnnnnnnn memory[N] 0 - 65535 + */ + memmory_addr = buff[operand_address] & 0x1f; + memmory_addr = memmory_addr << 8; + memmory_addr = memmory_addr | buff[(operand_address + 1) & 0xffff]; + temp_data16 = buff[memmory_addr] << 8; + temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; + *value = temp_data16; + /* debug + * g_warning("Reading 0x%x From address %u",temp_data16,memmory_addr); + */ + offset = offset +2; + } + + default : + break; + } + return offset; +} + /* + * + * The fourth operand type is the address (@). This operand is decoded + * as a multitype operand followed by a further step: the memory address + * of the UDVM instruction containing the address operand is added to + * obtain the correct operand value. So if the operand value from + * Figure 10 is D then the actual operand value of an address is + * calculated as follows: + * + * operand_value = (memory_address_of_instruction + D) modulo 2^16 + * + * Address operands are always used in instructions that control program + * flow, because they ensure that the UDVM bytecode is position- + * independent code (i.e., it will run independently of where it is + * placed in the UDVM memory). + */ +static int +decode_udvm_address_operand(guint8 *buff,guint operand_address, guint16 *value,guint current_address) +{ + guint32 result; + guint16 value1; + guint next_opreand_address; + + next_opreand_address = decode_udvm_multitype_operand(buff, operand_address, &value1); + result = value1 & 0xffff; + result = result + current_address; + *value = result & 0xffff; + return next_opreand_address; +} + + +/* + * This is a lookup table used to reverse the bits in a byte. + */ +static guint8 reverse [] = { + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, + 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, + 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, + 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, + 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, + 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, + 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, + 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, + 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, + 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, + 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, + 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, + 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, + 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, + 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, + 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, + 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, + 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, + 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, + 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, + 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, + 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, + 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, + 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, + 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, + 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, + 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF +}; + + +static int +decomp_dispatch_get_bits( + tvbuff_t *message_tvb, + proto_tree *udvm_tree, + guint8 bit_order, + guint8 *buff, + guint16 *old_input_bit_order, + guint16 *remaining_bits, + guint16 *input_bits, + guint *input_address, + guint16 length, + guint16 *result_code, + guint msg_end) +{ + guint16 input_bit_order; + guint16 bits_still_required = length; + guint16 value = 0; + guint8 octet; + gint extra_bytes_available = msg_end - *input_address; + gint p_bit; + gint prev_p_bit = *old_input_bit_order & 0x0001; + gint bits_to_use = 0; + + + input_bit_order = buff[68] << 8; + input_bit_order = input_bit_order | buff[69]; + *result_code = 0; + p_bit = (input_bit_order & 0x0001) != 0; + + /* + * Discard any spare bits. + * Note: We take care to avoid remaining_bits having the value of 8. + */ + if (prev_p_bit != p_bit) + { + *remaining_bits = 0; + *old_input_bit_order = input_bit_order; + } + + /* + * Check we can suppy the required number of bits now, before we alter + * the input buffer's state. + */ + if (*remaining_bits + extra_bytes_available * 8 < length) + { + *result_code = 11; + return 0xfbad; + } + + /* Note: This is never called with length > 16, so the following loop + * never loops more than three time. */ + while (bits_still_required > 0) + { + /* + * We only put anything into input_bits if we know we will remove + * at least one bit. That ensures we can simply discard the spare + * bits if the P-bit changes. + */ + if (*remaining_bits == 0) + { + octet = tvb_get_guint8(message_tvb, *input_address); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, message_tvb, *input_address , 1, + " Getting value: %u (0x%x) From Addr: %u", octet, octet, *input_address); + } + *input_address = *input_address + 1; + + if (p_bit != 0) + { + octet = reverse[octet]; + } + *input_bits = octet; + *remaining_bits = 8; + } + + /* Add some more bits to the accumulated value. */ + bits_to_use = bits_still_required < *remaining_bits ? bits_still_required : *remaining_bits; + bits_still_required -= bits_to_use; + + *input_bits <<= bits_to_use; /* Shift bits into MSByte */ + value = (value << bits_to_use) /* Then add to the accumulated value */ + | ((*input_bits >> 8) & 0xFF); + *remaining_bits -= bits_to_use; + *input_bits &= 0x00FF; /* Leave just the remaining bits */ + } + + if (bit_order != 0) + { + /* Bit reverse the entire word. */ + guint16 lsb = reverse[(value >> 8) & 0xFF]; + guint16 msb = reverse[value & 0xFF]; + + value = ((msb << 8) | lsb) >> (16 - length); + } + + return value; +} + +static tvbuff_t* +decompress_sigcomp_message(tvbuff_t *bytecode_tvb, tvbuff_t *message_tvb, packet_info *pinfo, + proto_tree *udvm_tree, gint udvm_mem_dest, + gint print_flags, gint hf_id, + gint header_len, + gint byte_code_state_len, gint byte_code_id_len, + gint udvm_start_ip) +{ + tvbuff_t *decomp_tvb; + /* UDVM memory must be initialised to zero */ + guint8 *buff = (guint8 *)wmem_alloc0(wmem_packet_scope(), UDVM_MEMORY_SIZE); + char string[2]; + guint8 *out_buff; /* Largest allowed size for a message is UDVM_MEMORY_SIZE = 65536 */ + guint32 i = 0; + guint16 n = 0; + guint16 m = 0; + guint16 x; + guint k = 0; + guint16 H; + guint16 oldH; + guint offset = 0; + guint result_dest; + guint code_length =0; + guint8 current_instruction; + guint current_address; + guint operand_address; + guint input_address; + guint16 output_address = 0; + guint next_operand_address; + guint8 octet; + guint8 msb; + guint8 lsb; + guint16 byte_copy_right; + guint16 byte_copy_left; + guint16 input_bit_order; + guint16 stack_location; + guint16 stack_fill; + guint16 result; + guint msg_end = tvb_reported_length_remaining(message_tvb, 0); + guint16 result_code = 0; + guint16 old_input_bit_order = 0; + guint16 remaining_bits = 0; + guint16 input_bits = 0; + guint8 bit_order = 0; + gboolean outside_huffman_boundaries = TRUE; + gboolean print_in_loop = FALSE; + guint16 instruction_address; + guint8 no_of_state_create = 0; + guint16 state_length_buff[5]; + guint16 state_address_buff[5]; + guint16 state_instruction_buff[5]; + guint16 state_minimum_access_length_buff[5]; + /* guint16 state_state_retention_priority_buff[5]; */ + guint32 used_udvm_cycles = 0; + guint cycles_per_bit; + guint maximum_UDVM_cycles; + guint8 *sha1buff; + unsigned char sha1_digest_buf[STATE_BUFFER_SIZE]; + sha1_context ctx; + + + /* UDVM operand variables */ + guint16 length; + guint16 at_address; + guint16 destination; + guint16 addr; + guint16 value; + guint16 p_id_start; + guint16 p_id_length; + guint16 state_begin; + guint16 state_length; + guint16 state_address; + guint16 state_instruction; + guint16 operand_1; + guint16 operand_2; + guint16 value_1; + guint16 value_2; + guint16 at_address_1; + guint16 at_address_2; + guint16 at_address_3; + guint16 j; + guint16 bits_n; + guint16 lower_bound_n; + guint16 upper_bound_n; + guint16 uncompressed_n; + guint16 position; + guint16 ref_destination; /* could I have used $destination ? */ + guint16 multy_offset; + guint16 output_start; + guint16 output_length; + guint16 minimum_access_length; + guint16 state_retention_priority; + guint16 requested_feedback_location; + guint16 returned_parameters_location; + guint16 start_value; + + + /* Set print parameters */ + print_level_1 = FALSE; + print_level_2 = FALSE; + print_level_3 = FALSE; + show_instr_detail_level = 0; + + + + switch( print_flags ) { + case 0: + break; + + case 1: + print_level_1 = TRUE; + show_instr_detail_level = 1; + break; + case 2: + print_level_1 = TRUE; + print_level_2 = TRUE; + show_instr_detail_level = 1; + break; + case 3: + print_level_1 = TRUE; + print_level_2 = TRUE; + print_level_3 = TRUE; + show_instr_detail_level = 2; + break; + default: + print_level_1 = TRUE; + show_instr_detail_level = 1; + break; + } + + /* Set initial UDVM data + * The first 32 bytes of UDVM memory are then initialized to special + * values as illustrated in Figure 5. + * + * 0 7 8 15 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | UDVM_memory_size | 0 - 1 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | cycles_per_bit | 2 - 3 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | SigComp_version | 4 - 5 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | partial_state_ID_length | 6 - 7 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | state_length | 8 - 9 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | | + * : reserved : 10 - 31 + * | | + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * Figure 5: Initializing Useful Values in UDVM memory + */ + /* UDVM_memory_size */ + buff[0] = (UDVM_MEMORY_SIZE >> 8) & 0x00FF; + buff[1] = UDVM_MEMORY_SIZE & 0x00FF; + /* cycles_per_bit */ + buff[2] = 0; + buff[3] = 16; + /* SigComp_version */ + buff[4] = 0; + buff[5] = 1; + /* partial_state_ID_length */ + buff[6] = (byte_code_id_len >> 8) & 0x00FF; + buff[7] = byte_code_id_len & 0x00FF; + /* state_length */ + buff[8] = (byte_code_state_len >> 8) & 0x00FF; + buff[9] = byte_code_state_len & 0x00FF; + + code_length = tvb_reported_length_remaining(bytecode_tvb, 0); + + cycles_per_bit = buff[2] << 8; + cycles_per_bit = cycles_per_bit | buff[3]; + /* + * maximum_UDVM_cycles = (8 * n + 1000) * cycles_per_bit + */ + maximum_UDVM_cycles = (( 8 * (header_len + msg_end) ) + 1000) * cycles_per_bit; + + proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"maximum_UDVM_cycles(%u) = (( 8 * msg_end(%u) ) + 1000) * cycles_per_bit(%u)",maximum_UDVM_cycles,msg_end,cycles_per_bit); + proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"Message Length: %u,Byte code length: %u, Maximum UDVM cycles: %u",msg_end,code_length,maximum_UDVM_cycles); + + /* Load bytecode into UDVM starting at "udvm_mem_dest" */ + i = udvm_mem_dest; + if ( print_level_3 ) + proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"Load bytecode into UDVM starting at %u",i); + while ( code_length > offset && i < UDVM_MEMORY_SIZE ) { + buff[i] = tvb_get_guint8(bytecode_tvb, offset); + if ( print_level_3 ) + proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1, + " Addr: %u Instruction code(0x%0x) ", i, buff[i]); + + i++; + offset++; + + } + /* Start executing code */ + current_address = udvm_start_ip; + input_address = 0; + + proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"UDVM EXECUTION STARTED at Address: %u Message size %u", + current_address, msg_end); + + /* Largest allowed size for a message is UDVM_MEMORY_SIZE = 65536 */ + out_buff = (guint8 *)g_malloc(UDVM_MEMORY_SIZE); + +execute_next_instruction: + + if ( used_udvm_cycles > maximum_UDVM_cycles ){ + result_code = 15; + goto decompression_failure; + } + used_udvm_cycles++; + current_instruction = buff[current_address & 0xffff]; + + switch ( current_instruction ) { + case SIGCOMP_INSTR_DECOMPRESSION_FAILURE: + if ( result_code == 0 ) + result_code = 9; + proto_tree_add_text(udvm_tree, NULL, 0, 0, + "Addr: %u ## DECOMPRESSION-FAILURE(0)", + current_address); + proto_tree_add_text(udvm_tree, NULL, 0, 0,"Wireshark UDVM diagnostic: %s.", + val_to_str(result_code, result_code_vals,"Unknown (%u)")); + if ( output_address > 0 ){ + /* At least something got decompressed, show it */ + decomp_tvb = tvb_new_child_real_data(message_tvb, out_buff,output_address,output_address); + /* Arrange that the allocated packet data copy be freed when the + * tvbuff is freed. + */ + tvb_set_free_cb( decomp_tvb, g_free ); + /* Add the tvbuff to the list of tvbuffs to which the tvbuff we + * were handed refers, so it'll get cleaned up when that tvbuff + * is cleaned up. + */ + add_new_data_source(pinfo, decomp_tvb, "Decompressed SigComp message(Incomplete)"); + proto_tree_add_text(udvm_tree, decomp_tvb, 0, -1,"SigComp message Decompression failure"); + return decomp_tvb; + } + g_free(out_buff); + return NULL; + break; + + case SIGCOMP_INSTR_AND: /* 1 AND ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## AND(1) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## AND (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 & operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_OR: /* 2 OR ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## OR(2) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## OR (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 | operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_NOT: /* 3 NOT ($operand_1) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## NOT(3) ($operand_1)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## NOT (operand_1=%u)", + current_address, operand_1); + } + /* execute the instruction */ + result = operand_1 ^ 0xffff; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_LSHIFT: /* 4 LSHIFT ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## LSHIFT(4) ($operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## LSHIFT (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 << operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + + break; + case SIGCOMP_INSTR_RSHIFT: /* 5 RSHIFT ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## RSHIFT(5) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## RSHIFT (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 >> operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_ADD: /* 6 ADD ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## ADD(6) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## ADD (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 + operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + + case SIGCOMP_INSTR_SUBTRACT: /* 7 SUBTRACT ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SUBTRACT(7) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SUBTRACT (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* execute the instruction */ + result = operand_1 - operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_MULTIPLY: /* 8 MULTIPLY ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ##MULTIPLY(8) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## MULTIPLY (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* + * execute the instruction + * MULTIPLY (m, n) := m * n (modulo 2^16) + */ + if ( operand_2 == 0){ + result_code = 4; + goto decompression_failure; + } + result = operand_1 * operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_DIVIDE: /* 9 DIVIDE ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## DIVIDE(9) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## DIVIDE (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* + * execute the instruction + * DIVIDE (m, n) := floor(m / n) + * Decompression failure occurs if a DIVIDE or REMAINDER instruction + * encounters an operand_2 that is zero. + */ + if ( operand_2 == 0){ + result_code = 4; + goto decompression_failure; + } + result = operand_1 / operand_2; + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_REMAINDER: /* 10 REMAINDER ($operand_1, %operand_2) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## REMAINDER(10) (operand_1, operand_2)", + current_address); + } + /* $operand_1*/ + operand_address = current_address + 1; + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &operand_1, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", + operand_address, operand_1); + } + operand_address = next_operand_address; + /* %operand_2*/ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", + operand_address, operand_2); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## REMAINDER (operand_1=%u, operand_2=%u)", + current_address, operand_1, operand_2); + } + /* + * execute the instruction + * REMAINDER (m, n) := m - n * floor(m / n) + * Decompression failure occurs if a DIVIDE or REMAINDER instruction + * encounters an operand_2 that is zero. + */ + if ( operand_2 == 0){ + result_code = 4; + goto decompression_failure; + } + result = operand_1 - operand_2 * (operand_1 / operand_2); + lsb = result & 0xff; + msb = result >> 8; + buff[result_dest] = msb; + buff[(result_dest+1) & 0xffff] = lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", + result, result_dest); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_SORT_ASCENDING: /* 11 SORT-ASCENDING (%start, %n, %k) */ + /* + * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) + */ + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SORT-ASCENDING(11) (start, n, k))", + current_address); + } + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Execution of this instruction is NOT implemented"); + /* + * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) + */ + break; + + case SIGCOMP_INSTR_SORT_DESCENDING: /* 12 SORT-DESCENDING (%start, %n, %k) */ + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SORT-DESCENDING(12) (start, n, k))", + current_address); + } + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Execution of this instruction is NOT implemented"); + /* + * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) + */ + break; + case SIGCOMP_INSTR_SHA_1: /* 13 SHA-1 (%position, %length, %destination) */ + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SHA-1(13) (position, length, destination)", + current_address); + } + operand_address = current_address + 1; + /* %position */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", + operand_address, position); + } + operand_address = next_operand_address; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + /* $destination */ + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &ref_destination, &result_dest); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u $destination %u", + operand_address, ref_destination); + } + used_udvm_cycles = used_udvm_cycles + length; + + n = 0; + k = position; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, 0, -1, + "byte_copy_right = %u", byte_copy_right); + } + + sha1_starts( &ctx ); + + while (n<length) { + guint16 handle_now = length; + + if ( k < byte_copy_right && byte_copy_right <= k + (length-n) ){ + handle_now = byte_copy_right - position; + } + + if (k + handle_now >= UDVM_MEMORY_SIZE) + goto decompression_failure; + sha1_update( &ctx, &buff[k], handle_now ); + + k = ( k + handle_now ) & 0xffff; + n = ( n + handle_now ) & 0xffff; + + if ( k >= byte_copy_right ) { + k = byte_copy_left; + } + } + + sha1_finish( &ctx, sha1_digest_buf ); + + k = ref_destination; + + for ( n=0; n< STATE_BUFFER_SIZE; n++ ) { + + buff[k] = sha1_digest_buf[n]; + + k = ( k + 1 ) & 0xffff; + n++; + + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + } + + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, 0, -1, + "Calculated SHA-1: %s", + bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_BUFFER_SIZE)); + } + + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_LOAD: /* 14 LOAD (%address, %value) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## LOAD(14) (%%address, %%value)", + current_address); + } + operand_address = current_address + 1; + /* %address */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", + operand_address, addr); + } + operand_address = next_operand_address; + /* %value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## LOAD (%%address=%u, %%value=%u)", + current_address, addr, value); + } + lsb = value & 0xff; + msb = value >> 8; + + buff[addr] = msb; + buff[(addr + 1) & 0xffff] = lsb; + + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, value); + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading bytes at %u Value %u 0x%x", + addr, value, value); + } + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_MULTILOAD: /* 15 MULTILOAD (%address, #n, %value_0, ..., %value_n-1) */ + /* RFC 3320: + * The MULTILOAD instruction sets a contiguous block of 2-byte words in + * the UDVM memory to specified values. + * Hmm what if the value to load only takes one byte ? Chose to always load two bytes. + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## MULTILOAD(15) (%%address, #n, value_0, ..., value_n-1)", + current_address); + } + operand_address = current_address + 1; + /* %address */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", + operand_address, addr); + } + operand_address = next_operand_address; + + /* #n */ + next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", + operand_address, n); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## MULTILOAD (%%address=%u, #n=%u, value_0, ..., value_%d)", + current_address, addr, n, n-1); + } + operand_address = next_operand_address; + used_udvm_cycles = used_udvm_cycles + n; + while ( n > 0) { + n = n - 1; + /* %value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); + lsb = value & 0xff; + msb = value >> 8; + + if (addr >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + + buff[addr] = msb; + buff[(addr + 1) & 0xffff] = lsb; + /* debug + */ + length = next_operand_address - operand_address; + + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, "Addr: %u Value %5u - Loading bytes at %5u Value %5u 0x%x", + operand_address, value, addr, value, value); + } + addr = addr + 2; + operand_address = next_operand_address; + } + current_address = next_operand_address; + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_PUSH: /* 16 PUSH (%value) */ + if (show_instr_detail_level == 2){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## PUSH(16) (value)", + current_address); + } + operand_address = current_address + 1; + /* %value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); + if (show_instr_detail_level == 2){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, value); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## PUSH (value=%u)", + current_address, value); + } + current_address = next_operand_address; + + /* Push the value address onto the stack */ + stack_location = (buff[70] << 8) | buff[71]; + stack_fill = (buff[stack_location] << 8) + | buff[(stack_location+1) & 0xFFFF]; + addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; + + if (addr >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + + buff[addr] = (value >> 8) & 0x00FF; + buff[(addr+1) & 0xFFFF] = value & 0x00FF; + + if (stack_location >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + + stack_fill = (stack_fill + 1) & 0xFFFF; + buff[stack_location] = (stack_fill >> 8) & 0x00FF; + buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; + + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_POP: /* 17 POP (%address) */ + if (show_instr_detail_level == 2){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## POP(16) (value)", + current_address); + } + operand_address = current_address + 1; + /* %value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); + if (show_instr_detail_level == 2){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, destination); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## POP (address=%u)", + current_address, destination); + } + current_address = next_operand_address; + + /* Pop value from the top of the stack */ + stack_location = (buff[70] << 8) | buff[71]; + stack_fill = (buff[stack_location] << 8) + | buff[(stack_location+1) & 0xFFFF]; + if (stack_fill == 0) + { + result_code = 16; + goto decompression_failure; + } + + if (stack_location >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + + stack_fill = (stack_fill - 1) & 0xFFFF; + buff[stack_location] = (stack_fill >> 8) & 0x00FF; + buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; + + addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; + + if (addr >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + + value = (buff[addr] << 8) + | buff[(addr+1) & 0xFFFF]; + + /* ... and store the popped value. */ + if (destination >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[destination] = (value >> 8) & 0x00FF; + buff[(destination+1) & 0xFFFF] = value & 0x00FF; + + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_COPY: /* 18 COPY (%position, %length, %destination) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY(18) (position, length, destination)", + current_address); + } + operand_address = current_address + 1; + /* %position */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", + operand_address, position); + } + operand_address = next_operand_address; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + /* %destination */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", + operand_address, destination); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY (position=%u, length=%u, destination=%u)", + current_address, position, length, destination); + } + current_address = next_operand_address; + /* + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + n = 0; + k = destination; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_right = %u", byte_copy_right); + } + + while ( n < length ){ + buff[k] = buff[position]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Copying value: %u (0x%x) to Addr: %u", + buff[position], buff[position], k); + } + position = ( position + 1 ) & 0xffff; + k = ( k + 1 ) & 0xffff; + n++; + + /* + * Check for circular buffer wrapping after the positions are + * incremented. If either started at BCR then they should continue + * to increment beyond BCR. + */ + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + if ( position == byte_copy_right ){ + position = byte_copy_left; + } + } + used_udvm_cycles = used_udvm_cycles + length; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_COPY_LITERAL: /* 19 COPY-LITERAL (%position, %length, $destination) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY-LITERAL(19) (position, length, $destination)", + current_address); + } + operand_address = current_address + 1; + /* %position */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", + operand_address, position); + } + operand_address = next_operand_address; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + + /* $destination */ + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &ref_destination, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u destination %u", + operand_address, ref_destination); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY-LITERAL (position=%u, length=%u, $destination=%u)", + current_address, position, length, ref_destination); + } + current_address = next_operand_address; + + + /* + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + n = 0; + k = ref_destination; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_right = %u", byte_copy_right); + } + while ( n < length ){ + + buff[k] = buff[position]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Copying value: %u (0x%x) to Addr: %u", + buff[position], buff[position], k); + } + position = ( position + 1 ) & 0xffff; + k = ( k + 1 ) & 0xffff; + n++; + + /* + * Check for circular buffer wrapping after the positions are + * incremented. It is important that k cannot be left set + * to BCR. Also, if either started at BCR then they should continue + * to increment beyond BCR. + */ + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + if ( position == byte_copy_right ){ + position = byte_copy_left; + } + } + buff[result_dest] = k >> 8; + buff[(result_dest + 1) & 0xffff] = k & 0x00ff; + + used_udvm_cycles = used_udvm_cycles + length; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_COPY_OFFSET: /* 20 COPY-OFFSET (%offset, %length, $destination) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY-OFFSET(20) (offset, length, $destination)", + current_address); + } + operand_address = current_address + 1; + /* %offset */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &multy_offset); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u offset %u", + operand_address, multy_offset); + } + operand_address = next_operand_address; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + + /* $destination */ + next_operand_address = dissect_udvm_reference_operand_memory(buff, operand_address, &ref_destination, &result_dest); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u $destination %u", + operand_address, ref_destination); + } + + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COPY-OFFSET (offset=%u, length=%u, $destination=%u)", + current_address, multy_offset, length, result_dest); + } + current_address = next_operand_address; + + /* Execute the instruction: + * To derive the value of the position operand, starting at the memory + * address specified by destination, the UDVM counts backwards a total + * of offset memory addresses. + * + * If the memory address specified in byte_copy_left is reached, the + * next memory address is taken to be (byte_copy_right - 1) modulo 2^16. + */ + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + + /* + * In order to work out the position, simple arithmetic is tricky + * to apply because there some nasty corner cases. A simple loop + * is inefficient but the logic is simple. + * + * FUTURE: This could be optimised. + */ + for (position = ref_destination, i = 0; i < multy_offset; i++) + { + if ( position == byte_copy_left ) + { + position = (byte_copy_right - 1) & 0xffff; + } + else + { + position = (position - 1) & 0xffff; + } + } + + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_left = %u byte_copy_right = %u position= %u", + byte_copy_left, byte_copy_right, position); + } + /* The COPY-OFFSET instruction then behaves as a COPY-LITERAL + * instruction, taking the value of the position operand to be the last + * memory address reached in the above step. + */ + + /* + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + n = 0; + k = ref_destination; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_left = %u byte_copy_right = %u", byte_copy_left, byte_copy_right); + } + while ( n < length ){ + buff[k] = buff[position]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Copying value: %5u (0x%x) from Addr: %u to Addr: %u", + buff[position], buff[position],(position), k); + } + n++; + k = ( k + 1 ) & 0xffff; + position = ( position + 1 ) & 0xffff; + + /* + * Check for circular buffer wrapping after the positions are + * incremented. It is important that k cannot be left set + * to BCR. Also, if either started at BCR then they should continue + * to increment beyond BCR. + */ + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + if ( position == byte_copy_right ){ + position = byte_copy_left; + } + } + buff[result_dest] = k >> 8; + buff[result_dest + 1] = k & 0x00ff; + used_udvm_cycles = used_udvm_cycles + length; + goto execute_next_instruction; + + break; + case SIGCOMP_INSTR_MEMSET: /* 21 MEMSET (%address, %length, %start_value, %offset) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## MEMSET(21) (address, length, start_value, offset)", + current_address); + } + operand_address = current_address + 1; + + /* %address */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", + operand_address, addr); + } + operand_address = next_operand_address; + + /* %length, */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + /* %start_value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &start_value); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u start_value %u", + operand_address, start_value); + } + operand_address = next_operand_address; + + /* %offset */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &multy_offset); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u offset %u", + operand_address, multy_offset); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## MEMSET (address=%u, length=%u, start_value=%u, offset=%u)", + current_address, addr, length, start_value, multy_offset); + } + current_address = next_operand_address; + /* exetute the instruction + * The sequence of values used by the MEMSET instruction is specified by + * the following formula: + * + * Seq[n] := (start_value + n * offset) modulo 256 + */ + n = 0; + k = addr; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_left = %u byte_copy_right = %u", byte_copy_left, byte_copy_right); + } + while ( n < length ){ + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + buff[k] = (start_value + ( n * multy_offset)) & 0xff; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Storing value: %u (0x%x) at Addr: %u", + buff[k], buff[k], k); + } + k = ( k + 1 ) & 0xffff; + n++; + }/* end while */ + used_udvm_cycles = used_udvm_cycles + length; + goto execute_next_instruction; + break; + + + case SIGCOMP_INSTR_JUMP: /* 22 JUMP (@address) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## JUMP(22) (@address)", + current_address); + } + operand_address = current_address + 1; + /* @address */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + /*next_operand_address = */decode_udvm_address_operand(buff,operand_address, &at_address, current_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## JUMP (@address=%u)", + current_address, at_address); + } + current_address = at_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_COMPARE: /* 23 */ + /* COMPARE (%value_1, %value_2, @address_1, @address_2, @address_3) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COMPARE(23) (value_1, value_2, @address_1, @address_2, @address_3)", + current_address); + } + operand_address = current_address + 1; + + /* %value_1 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value_1); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, value_1); + } + operand_address = next_operand_address; + + /* %value_2 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value_2); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, value_2); + } + operand_address = next_operand_address; + + /* @address_1 */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_1); + at_address_1 = ( current_address + at_address_1) & 0xffff; + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address_1); + } + operand_address = next_operand_address; + + + /* @address_2 */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_2); + at_address_2 = ( current_address + at_address_2) & 0xffff; + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address_2); + } + operand_address = next_operand_address; + + /* @address_3 */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + /*next_operand_address = */decode_udvm_multitype_operand(buff, operand_address, &at_address_3); + at_address_3 = ( current_address + at_address_3) & 0xffff; + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address_3); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## COMPARE (value_1=%u, value_2=%u, @address_1=%u, @address_2=%u, @address_3=%u)", + current_address, value_1, value_2, at_address_1, at_address_2, at_address_3); + } + /* execute the instruction + * If value_1 < value_2 then the UDVM continues instruction execution at + * the memory address specified by address 1. If value_1 = value_2 then + * it jumps to the address specified by address_2. If value_1 > value_2 + * then it jumps to the address specified by address_3. + */ + if ( value_1 < value_2 ) + current_address = at_address_1; + if ( value_1 == value_2 ) + current_address = at_address_2; + if ( value_1 > value_2 ) + current_address = at_address_3; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_CALL: /* 24 CALL (@address) (PUSH addr )*/ + if (show_instr_detail_level == 2){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## CALL(24) (@address) (PUSH addr )", + current_address); + } + operand_address = current_address + 1; + /* @address */ + next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## CALL (@address=%u)", + current_address, at_address); + } + current_address = next_operand_address; + + /* Push the current address onto the stack */ + stack_location = (buff[70] << 8) | buff[71]; + stack_fill = (buff[stack_location] << 8) + | buff[(stack_location+1) & 0xFFFF]; + addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; + if (addr >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[addr] = (current_address >> 8) & 0x00FF; + buff[(addr+1) & 0xFFFF] = current_address & 0x00FF; + + stack_fill = (stack_fill + 1) & 0xFFFF; + if (stack_location >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[stack_location] = (stack_fill >> 8) & 0x00FF; + buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; + + /* ... and jump to the destination address */ + current_address = at_address; + + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_RETURN: /* 25 POP and return */ + if (print_level_1 || show_instr_detail_level == 1){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## POP(25) and return", + current_address); + } + + /* Pop value from the top of the stack */ + stack_location = (buff[70] << 8) | buff[71]; + stack_fill = (buff[stack_location] << 8) + | buff[(stack_location+1) & 0xFFFF]; + if (stack_fill == 0) + { + result_code = 16; + goto decompression_failure; + } + + stack_fill = (stack_fill - 1) & 0xFFFF; + if (stack_location >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[stack_location] = (stack_fill >> 8) & 0x00FF; + buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; + + addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; + at_address = (buff[addr] << 8) + | buff[(addr+1) & 0xFFFF]; + + /* ... and set the PC to the popped value */ + current_address = at_address; + + goto execute_next_instruction; + + break; + + case SIGCOMP_INSTR_SWITCH: /* 26 SWITCH (#n, %j, @address_0, @address_1, ... , @address_n-1) */ + /* + * When a SWITCH instruction is encountered the UDVM reads the value of + * j. It then continues instruction execution at the address specified + * by address j. + * + * Decompression failure occurs if j specifies a value of n or more, or + * if the address lies beyond the overall UDVM memory size. + */ + instruction_address = current_address; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## SWITCH (#n, j, @address_0, @address_1, ... , @address_n-1))", + current_address); + } + operand_address = current_address + 1; + /* #n + * Number of addresses in the instruction + */ + next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", + operand_address, n); + } + operand_address = next_operand_address; + /* %j */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &j); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u j %u", + operand_address, j); + } + operand_address = next_operand_address; + m = 0; + while ( m < n ){ + /* @address_n-1 */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_1); + at_address_1 = ( instruction_address + at_address_1) & 0xffff; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address_1); + } + if ( j == m ){ + current_address = at_address_1; + } + operand_address = next_operand_address; + m++; + } + /* Check decompression failure */ + if ( ( j == n ) || ( j > n )){ + result_code = 5; + goto decompression_failure; + } + if ( current_address > UDVM_MEMORY_SIZE ){ + result_code = 6; + goto decompression_failure; + } + used_udvm_cycles = used_udvm_cycles + n; + + goto execute_next_instruction; + + break; + case SIGCOMP_INSTR_CRC: /* 27 CRC (%value, %position, %length, @address) */ + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## CRC (value, position, length, @address)", + current_address); + } + + operand_address = current_address + 1; + + /* %value */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", + operand_address, value); + } + operand_address = next_operand_address; + + /* %position */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", + operand_address, position); + } + operand_address = next_operand_address; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + /* @address */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address); + at_address = ( current_address + at_address) & 0xffff; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + used_udvm_cycles = used_udvm_cycles + length; + + n = 0; + k = position; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + result = 0; + + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, 0, -1, + "byte_copy_right = %u", byte_copy_right); + } + + while (n<length) { + + guint16 handle_now = length - n; + + if ( k < byte_copy_right && byte_copy_right <= k + (length-n) ){ + handle_now = byte_copy_right - k; + } + + if (k + handle_now >= UDVM_MEMORY_SIZE) + goto decompression_failure; + result = crc16_ccitt_seed(&buff[k], handle_now, (guint16) (result ^ 0xffff)); + + k = ( k + handle_now ) & 0xffff; + n = ( n + handle_now ) & 0xffff; + + if ( k >= byte_copy_right ) { + k = byte_copy_left; + } + } + + result = result ^ 0xffff; + + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, "Calculated CRC %u", result); + } + if (result != value){ + current_address = at_address; + } + else { + current_address = next_operand_address; + } + goto execute_next_instruction; + break; + + + case SIGCOMP_INSTR_INPUT_BYTES: /* 28 INPUT-BYTES (%length, %destination, @address) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-BYTES(28) length, destination, @address)", + current_address); + } + operand_address = current_address + 1; + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", + operand_address, length); + } + operand_address = next_operand_address; + + /* %destination */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", + operand_address, destination); + } + operand_address = next_operand_address; + + /* @address */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address); + at_address = ( current_address + at_address) & 0xffff; + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-BYTES length=%u, destination=%u, @address=%u)", + current_address, length, destination, at_address); + } + /* execute the instruction TODO insert checks + * RFC 3320 : + * + * 0 7 8 15 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | byte_copy_left | 64 - 65 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | byte_copy_right | 66 - 67 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | input_bit_order | 68 - 69 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | stack_location | 70 - 71 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * Figure 7: Memory addresses of the UDVM registers + * : + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + n = 0; + k = destination; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_right = %u", byte_copy_right); + } + /* clear out remaining bits if any */ + remaining_bits = 0; + input_bits=0; + /* operand_address used as dummy */ + while ( n < length ){ + if (input_address > ( msg_end - 1)){ + current_address = at_address; + result_code = 14; + goto execute_next_instruction; + } + + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + octet = tvb_get_guint8(message_tvb, input_address); + buff[k] = octet; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Loading value: %u (0x%x) at Addr: %u", octet, octet, k); + } + input_address++; + /* + * If the instruction requests data that lies beyond the end of the + * SigComp message, no data is returned. Instead the UDVM moves program + * execution to the address specified by the address operand. + */ + + + k = ( k + 1 ) & 0xffff; + n++; + } + used_udvm_cycles = used_udvm_cycles + length; + current_address = next_operand_address; + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_INPUT_BITS:/* 29 INPUT-BITS (%length, %destination, @address) */ + /* + * The length operand indicates the requested number of bits. + * Decompression failure occurs if this operand does not lie between 0 + * and 16 inclusive. + * + * The destination operand specifies the memory address to which the + * compressed data should be copied. Note that the requested bits are + * interpreted as a 2-byte integer ranging from 0 to 2^length - 1, as + * explained in Section 8.2. + * + * If the instruction requests data that lies beyond the end of the + * SigComp message, no data is returned. Instead the UDVM moves program + * execution to the address specified by the address operand. + */ + + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-BITS(29) (length, destination, @address)", + current_address); + } + operand_address = current_address + 1; + + /* %length */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u length %u", + operand_address, length); + } + operand_address = next_operand_address; + /* %destination */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", + operand_address, destination); + } + operand_address = next_operand_address; + + /* @address */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-BITS length=%u, destination=%u, @address=%u)", + current_address, length, destination, at_address); + } + current_address = next_operand_address; + + /* + * Execute actual instr. + * The input_bit_order register contains the following three flags: + * + * 0 7 8 15 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | reserved |F|H|P| 68 - 69 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + */ + input_bit_order = buff[68] << 8; + input_bit_order = input_bit_order | buff[69]; + /* + * If the instruction requests data that lies beyond the end of the + * SigComp message, no data is returned. Instead the UDVM moves program + * execution to the address specified by the address operand. + */ + + if ( length > 16 ){ + result_code = 7; + goto decompression_failure; + } + if ( input_bit_order > 7 ){ + result_code = 8; + goto decompression_failure; + } + + /* + * Transfer F bit to bit_order to tell decomp dispatcher which bit order to use + */ + bit_order = ( input_bit_order & 0x0004 ) >> 2; + value = decomp_dispatch_get_bits( message_tvb, udvm_tree, bit_order, + buff, &old_input_bit_order, &remaining_bits, + &input_bits, &input_address, length, &result_code, msg_end); + if ( result_code == 11 ){ + current_address = at_address; + goto execute_next_instruction; + } + msb = value >> 8; + lsb = value & 0x00ff; + if (destination >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[destination] = msb; + buff[(destination + 1) & 0xffff]=lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Loading value: %u (0x%x) at Addr: %u, remaining_bits: %u", value, value, destination, remaining_bits); + } + + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_INPUT_HUFFMAN: /* 30 */ + /* + * INPUT-HUFFMAN (%destination, @address, #n, %bits_1, %lower_bound_1, + * %upper_bound_1, %uncompressed_1, ... , %bits_n, %lower_bound_n, + * %upper_bound_n, %uncompressed_n) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-HUFFMAN (destination, @address, #n, bits_1, lower_bound_1,upper_bound_1, uncompressed_1, ... , bits_n, lower_bound_n,upper_bound_n, uncompressed_n)", + current_address); + } + operand_address = current_address + 1; + + /* %destination */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", + operand_address, destination); + } + operand_address = next_operand_address; + + /* @address */ + /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ + next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", + operand_address, at_address); + } + operand_address = next_operand_address; + + /* #n */ + next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", + operand_address, n); + } + operand_address = next_operand_address; + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## INPUT-HUFFMAN (destination=%u, @address=%u, #n=%u, bits_1, lower_1,upper_1, unc_1, ... , bits_%d, lower_%d,upper_%d, unc_%d)", + current_address, destination, at_address, n, n, n, n, n); + } + + used_udvm_cycles = used_udvm_cycles + n; + + /* + * Note that if n = 0 then the INPUT-HUFFMAN instruction is ignored and + * program execution resumes at the following instruction. + * Decompression failure occurs if (bits_1 + ... + bits_n) > 16. + * + * In all other cases, the behavior of the INPUT-HUFFMAN instruction is + * defined below: + * + * 1. Set j := 1 and set H := 0. + * + * 2. Request bits_j compressed bits. Interpret the returned bits as an + * integer k from 0 to 2^bits_j - 1, as explained in Section 8.2. + * + * 3. Set H := H * 2^bits_j + k. + * + * 4. If data is requested that lies beyond the end of the SigComp + * message, terminate the INPUT-HUFFMAN instruction and move program + * execution to the memory address specified by the address operand. + * + * 5. If (H < lower_bound_j) or (H > upper_bound_j) then set j := j + 1. + * Then go back to Step 2, unless j > n in which case decompression + * failure occurs. + * + * 6. Copy (H + uncompressed_j - lower_bound_j) modulo 2^16 to the + * memory address specified by the destination operand. + * + */ + /* + * The input_bit_order register contains the following three flags: + * + * 0 7 8 15 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * | reserved |F|H|P| 68 - 69 + * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + * + * Transfer H bit to bit_order to tell decomp dispatcher which bit order to use + */ + input_bit_order = buff[68] << 8; + input_bit_order = input_bit_order | buff[69]; + bit_order = ( input_bit_order & 0x0002 ) >> 1; + + j = 1; + H = 0; + m = n; + outside_huffman_boundaries = TRUE; + print_in_loop = print_level_3; + while ( m > 0 ){ + /* %bits_n */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &bits_n); + if (print_in_loop ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u bits_n %u", + operand_address, bits_n); + } + operand_address = next_operand_address; + + /* %lower_bound_n */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &lower_bound_n); + if (print_in_loop ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u lower_bound_n %u", + operand_address, lower_bound_n); + } + operand_address = next_operand_address; + /* %upper_bound_n */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &upper_bound_n); + if (print_in_loop ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u upper_bound_n %u", + operand_address, upper_bound_n); + } + operand_address = next_operand_address; + /* %uncompressed_n */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &uncompressed_n); + if (print_in_loop ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u uncompressed_n %u", + operand_address, uncompressed_n); + } + operand_address = next_operand_address; + /* execute instruction */ + if ( outside_huffman_boundaries ) { + /* + * 2. Request bits_j compressed bits. Interpret the returned bits as an + * integer k from 0 to 2^bits_j - 1, as explained in Section 8.2. + */ + k = decomp_dispatch_get_bits( message_tvb, udvm_tree, bit_order, + buff, &old_input_bit_order, &remaining_bits, + &input_bits, &input_address, bits_n, &result_code, msg_end); + if ( result_code == 11 ){ + /* + * 4. If data is requested that lies beyond the end of the SigComp + * message, terminate the INPUT-HUFFMAN instruction and move program + * execution to the memory address specified by the address operand. + */ + current_address = at_address; + goto execute_next_instruction; + } + + /* + * 3. Set H := H * 2^bits_j + k. + * [In practice is a shift+OR operation.] + */ + oldH = H; + H = (H << bits_n) | k; + if (print_level_3 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Set H(%u) := H(%u) * 2^bits_j(%u) + k(%u)", + H ,oldH, 1<<bits_n,k); + } + + /* + * 5. If (H < lower_bound_j) or (H > upper_bound_j) then set j := j + 1. + * Then go back to Step 2, unless j > n in which case decompression + * failure occurs. + */ + if ((H < lower_bound_n) || (H > upper_bound_n)){ + outside_huffman_boundaries = TRUE; + }else{ + outside_huffman_boundaries = FALSE; + print_in_loop = FALSE; + /* + * 6. Copy (H + uncompressed_j - lower_bound_j) modulo 2^16 to the + * memory address specified by the destination operand. + */ + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + " H(%u) = H(%u) + uncompressed_n(%u) - lower_bound_n(%u)", + (H + uncompressed_n - lower_bound_n ),H, uncompressed_n, lower_bound_n); + } + H = H + uncompressed_n - lower_bound_n; + msb = H >> 8; + lsb = H & 0x00ff; + if (destination >= UDVM_MEMORY_SIZE - 1) + goto decompression_failure; + buff[destination] = msb; + buff[(destination + 1) & 0xffff]=lsb; + if (print_level_1 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " Loading H: %u (0x%x) at Addr: %u,j = %u remaining_bits: %u", + H, H, destination,( n - m + 1 ), remaining_bits); + } + + } + + + } + m = m - 1; + } + if ( outside_huffman_boundaries ) { + result_code = 10; + goto decompression_failure; + } + + current_address = next_operand_address; + goto execute_next_instruction; + break; + + case SIGCOMP_INSTR_STATE_ACCESS: /* 31 */ + /* STATE-ACCESS (%partial_identifier_start, %partial_identifier_length, + * %state_begin, %state_length, %state_address, %state_instruction) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-ACCESS(31) (partial_identifier_start, partial_identifier_length,state_begin, state_length, state_address, state_instruction)", + current_address); + } + operand_address = current_address + 1; + + /* + * %partial_identifier_start + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_start); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_start %u", + operand_address, p_id_start); + } + + /* + * %partial_identifier_length + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_length %u", + operand_address, p_id_length); + } + /* + * %state_begin + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_begin); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_begin %u", + operand_address, state_begin); + } + /* + * %state_length + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", + operand_address, state_length); + } + /* + * %state_address + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", + operand_address, state_address); + } + /* + * %state_instruction + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", + operand_address, state_instruction); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-ACCESS(31) (partial_identifier_start=%u, partial_identifier_length=%u,state_begin=%u, state_length=%u, state_address=%u, state_instruction=%u)", + current_address, p_id_start, p_id_length, state_begin, state_length, state_address, state_instruction); + } + current_address = next_operand_address; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_2 ){ + proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, + " byte_copy_right = %u, byte_copy_left = %u", byte_copy_right,byte_copy_left); + } + + result_code = udvm_state_access(message_tvb, udvm_tree, buff, p_id_start, p_id_length, state_begin, &state_length, + &state_address, &state_instruction, hf_id); + if ( result_code != 0 ){ + goto decompression_failure; + } + used_udvm_cycles = used_udvm_cycles + state_length; + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_STATE_CREATE: /* 32 */ + /* + * STATE-CREATE (%state_length, %state_address, %state_instruction, + * %minimum_access_length, %state_retention_priority) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-CREATE(32) (state_length, state_address, state_instruction,minimum_access_length, state_retention_priority)", + current_address); + } + operand_address = current_address + 1; + + /* + * %state_length + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", + operand_address, state_length); + } + /* + * %state_address + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", + operand_address, state_address); + } + /* + * %state_instruction + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", + operand_address, state_instruction); + } + /* + * %minimum_access_length + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &minimum_access_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u minimum_access_length %u", + operand_address, minimum_access_length); + } + /* + * %state_retention_priority + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_retention_priority); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_retention_priority %u", + operand_address, state_retention_priority); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-CREATE(32) (state_length=%u, state_address=%u, state_instruction=%u,minimum_access_length=%u, state_retention_priority=%u)", + current_address, state_length, state_address, state_instruction,minimum_access_length, state_retention_priority); + } + current_address = next_operand_address; + /* Execute the instruction + * TODO Implement the instruction + * RFC3320: + * Note that the new state item cannot be created until a valid + * compartment identifier has been returned by the application. + * Consequently, when a STATE-CREATE instruction is encountered the UDVM + * simply buffers the five supplied operands until the END-MESSAGE + * instruction is reached. The steps taken at this point are described + * in Section 9.4.9. + * + * Decompression failure MUST occur if more than four state creation + * requests are made before the END-MESSAGE instruction is encountered. + * Decompression failure also occurs if the minimum_access_length does + * not lie between 6 and 20 inclusive, or if the + * state_retention_priority is 65535. + */ + no_of_state_create++; + if ( no_of_state_create > 4 ){ + result_code = 12; + goto decompression_failure; + } + if (( minimum_access_length < 6 ) || ( minimum_access_length > STATE_BUFFER_SIZE )){ + result_code = 1; + goto decompression_failure; + } + if ( state_retention_priority == 65535 ){ + result_code = 13; + goto decompression_failure; + } + state_length_buff[no_of_state_create] = state_length; + state_address_buff[no_of_state_create] = state_address; + state_instruction_buff[no_of_state_create] = state_instruction; + state_minimum_access_length_buff[no_of_state_create] = minimum_access_length; + /* state_state_retention_priority_buff[no_of_state_create] = state_retention_priority; */ + used_udvm_cycles = used_udvm_cycles + state_length; + /* Debug */ + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + n = 0; + k = state_address; + while ( n < state_length ){ + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + string[0]= buff[k]; + string[1]= '\0'; + if (print_level_3 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + " Addr: %5u State value: %u (0x%x) ASCII(%s)", + k,buff[k],buff[k],format_text(string, 1)); + } + k = ( k + 1 ) & 0xffff; + n++; + } + /* End debug */ + + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_STATE_FREE: /* 33 */ + /* + * STATE-FREE (%partial_identifier_start, %partial_identifier_length) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-FREE (partial_identifier_start, partial_identifier_length)", + current_address); + } + operand_address = current_address + 1; + /* + * %partial_identifier_start + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_start); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_start %u", + operand_address, p_id_start); + } + operand_address = next_operand_address; + + /* + * %partial_identifier_length + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_length %u", + operand_address, p_id_length); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## STATE-FREE (partial_identifier_start=%u, partial_identifier_length=%u)", + current_address, p_id_start, p_id_length); + } + current_address = next_operand_address; + + /* Execute the instruction: + * TODO implement it + */ + udvm_state_free(buff,p_id_start,p_id_length); + + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_OUTPUT: /* 34 OUTPUT (%output_start, %output_length) */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## OUTPUT(34) (output_start, output_length)", + current_address); + } + operand_address = current_address + 1; + /* + * %output_start + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &output_start); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u output_start %u", + operand_address, output_start); + } + operand_address = next_operand_address; + /* + * %output_length + */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &output_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u output_length %u", + operand_address, output_length); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## OUTPUT (output_start=%u, output_length=%u)", + current_address, output_start, output_length); + } + current_address = next_operand_address; + + /* + * Execute instruction + * 8.4. Byte copying + * : + * The string of bytes is copied in ascending order of memory address, + * respecting the bounds set by byte_copy_left and byte_copy_right. + * More precisely, if a byte is copied from/to Address m then the next + * byte is copied from/to Address n where n is calculated as follows: + * + * Set k := m + 1 (modulo 2^16) + * If k = byte_copy_right then set n := byte_copy_left, else set n := k + * + */ + + n = 0; + k = output_start; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + if (print_level_3 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + " byte_copy_right = %u", byte_copy_right); + } + while ( n < output_length ){ + + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + out_buff[output_address] = buff[k]; + string[0]= buff[k]; + string[1]= '\0'; + if (print_level_3 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + " Output value: %u (0x%x) ASCII(%s) from Addr: %u ,output to dispatcher position %u", + buff[k],buff[k],format_text(string,1), k,output_address); + } + k = ( k + 1 ) & 0xffff; + output_address ++; + n++; + } + used_udvm_cycles = used_udvm_cycles + output_length; + goto execute_next_instruction; + break; + case SIGCOMP_INSTR_END_MESSAGE: /* 35 */ + /* + * END-MESSAGE (%requested_feedback_location, + * %returned_parameters_location, %state_length, %state_address, + * %state_instruction, %minimum_access_length, + * %state_retention_priority) + */ + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## END-MESSAGE (requested_feedback_location,state_instruction, minimum_access_length,state_retention_priority)", + current_address); + } + operand_address = current_address + 1; + + /* %requested_feedback_location */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &requested_feedback_location); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u requested_feedback_location %u", + operand_address, requested_feedback_location); + } + operand_address = next_operand_address; + /* returned_parameters_location */ + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &returned_parameters_location); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u returned_parameters_location %u", + operand_address, returned_parameters_location); + } + /* + * %state_length + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", + operand_address, state_length); + } + /* + * %state_address + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", + operand_address, state_address); + } + /* + * %state_instruction + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", + operand_address, state_instruction); + } + + /* + * %minimum_access_length + */ + operand_address = next_operand_address; + next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &minimum_access_length); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u minimum_access_length %u", + operand_address, minimum_access_length); + } + + /* + * %state_retention_priority + */ + operand_address = next_operand_address; + /*next_operand_address =*/ decode_udvm_multitype_operand(buff, operand_address, &state_retention_priority); + if (show_instr_detail_level == 2 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_retention_priority %u", + operand_address, state_retention_priority); + } + if (show_instr_detail_level == 1) + { + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, + "Addr: %u ## END-MESSAGE (requested_feedback_location=%u, returned_parameters_location=%u, state_length=%u, state_address=%u, state_instruction=%u, minimum_access_length=%u, state_retention_priority=%u)", + current_address, requested_feedback_location, returned_parameters_location, state_length, state_address, state_instruction, minimum_access_length,state_retention_priority); + } + /* TODO: This isn't currently totaly correct as END_INSTRUCTION might not create state */ + no_of_state_create++; + if ( no_of_state_create > 4 ){ + result_code = 12; + goto decompression_failure; + } + state_length_buff[no_of_state_create] = state_length; + state_address_buff[no_of_state_create] = state_address; + state_instruction_buff[no_of_state_create] = state_instruction; + /* Not used ? */ + state_minimum_access_length_buff[no_of_state_create] = minimum_access_length; + /* state_state_retention_priority_buff[no_of_state_create] = state_retention_priority; */ + + /* Execute the instruction + */ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"no_of_state_create %u",no_of_state_create); + if ( no_of_state_create != 0 ){ + memset(sha1_digest_buf, 0, STATE_BUFFER_SIZE); + n = 1; + byte_copy_right = buff[66] << 8; + byte_copy_right = byte_copy_right | buff[67]; + byte_copy_left = buff[64] << 8; + byte_copy_left = byte_copy_left | buff[65]; + while ( n < no_of_state_create + 1 ){ + sha1buff = (guint8 *)g_malloc(state_length_buff[n]+8); + sha1buff[0] = state_length_buff[n] >> 8; + sha1buff[1] = state_length_buff[n] & 0xff; + sha1buff[2] = state_address_buff[n] >> 8; + sha1buff[3] = state_address_buff[n] & 0xff; + sha1buff[4] = state_instruction_buff[n] >> 8; + sha1buff[5] = state_instruction_buff[n] & 0xff; + sha1buff[6] = state_minimum_access_length_buff[n] >> 8; + sha1buff[7] = state_minimum_access_length_buff[n] & 0xff; + if (print_level_3 ){ + for( x=0; x < 8; x++){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"sha1buff %u 0x%x", + x,sha1buff[x]); + } + } + k = state_address_buff[n]; + for( x=0; x < state_length_buff[n]; x++) + { + if ( k == byte_copy_right ){ + k = byte_copy_left; + } + sha1buff[8+x] = buff[k]; + k = ( k + 1 ) & 0xffff; + } + + sha1_starts( &ctx ); + sha1_update( &ctx, (guint8 *) sha1buff, state_length_buff[n] + 8); + sha1_finish( &ctx, sha1_digest_buf ); + if (print_level_3 ){ + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"SHA1 digest %s", bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_BUFFER_SIZE)); + + } +/* begin partial state-id change cco@iptel.org */ +#if 0 + udvm_state_create(sha1buff, sha1_digest_buf, state_minimum_access_length_buff[n]); +#endif + udvm_state_create(sha1buff, sha1_digest_buf, STATE_MIN_ACCESS_LEN); +/* end partial state-id change cco@iptel.org */ + proto_tree_add_text(udvm_tree,bytecode_tvb, 0, -1,"### Creating state ###"); + proto_tree_add_string(udvm_tree,hf_id, bytecode_tvb, 0, 0, bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_MIN_ACCESS_LEN)); + + n++; + + } + } + + + + /* At least something got decompressed, show it */ + decomp_tvb = tvb_new_child_real_data(message_tvb, out_buff,output_address,output_address); + /* Arrange that the allocated packet data copy be freed when the + * tvbuff is freed. + */ + tvb_set_free_cb( decomp_tvb, g_free ); + + add_new_data_source(pinfo, decomp_tvb, "Decompressed SigComp message"); + /* + proto_tree_add_text(udvm_tree, decomp_tvb, 0, -1,"SigComp message Decompressed"); + */ + used_udvm_cycles = used_udvm_cycles + state_length; + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"maximum_UDVM_cycles %u used_udvm_cycles %u", + maximum_UDVM_cycles, used_udvm_cycles); + return decomp_tvb; + break; + + default: + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," ### Addr %u Invalid instruction: %u (0x%x)", + current_address,current_instruction,current_instruction); + break; + } + g_free(out_buff); + return NULL; +decompression_failure: + + proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"DECOMPRESSION FAILURE: %s", + val_to_str(result_code, result_code_vals,"Unknown (%u)")); + g_free(out_buff); + THROW(ReportedBoundsError); + return NULL; + +} + +/********************************************************************************************** + * + * SIGCOMP DISSECTOR + * + **********************************************************************************************/ + + /* Sigcomp over TCP record marking used * RFC 3320 * 4.2.2. Record Marking @@ -2658,7 +6651,7 @@ proto_register_sigcomp(void) "Warning! CPU intense at high detail", &udvm_print_detail_level, udvm_detail_vals, FALSE); - register_init_routine(&sigcomp_init_protocol); + register_init_routine(&sigcomp_init_udvm); diff --git a/epan/sigcomp-udvm.c b/epan/sigcomp-udvm.c deleted file mode 100644 index ed172c3424..0000000000 --- a/epan/sigcomp-udvm.c +++ /dev/null @@ -1,3223 +0,0 @@ -/* sigcomp-udvm.c - * Routines making up the Universal Decompressor Virtual Machine (UDVM) used for - * Signaling Compression (SigComp) dissection. - * Copyright 2004, Anders Broman <anders.broman@ericsson.com> - * - * Wireshark - Network traffic analyzer - * By Gerald Combs <gerald@wireshark.org> - * Copyright 1998 Gerald Combs - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * References: - * http://www.ietf.org/rfc/rfc3320.txt?number=3320 - * http://www.ietf.org/rfc/rfc3321.txt?number=3321 - * Useful links : - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-impl-guide-05.txt - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-sip-01.txt - */ - -#include "config.h" - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <glib.h> - -#include <wsutil/sha1.h> -#include <wsutil/crc16.h> - -#include "packet.h" -#include "exceptions.h" -#include "strutil.h" -#include "to_str.h" -#include "sigcomp-udvm.h" -#include "sigcomp_state_hdlr.h" -#include "except.h" - -#define SIGCOMP_INSTR_DECOMPRESSION_FAILURE 0 -#define SIGCOMP_INSTR_AND 1 -#define SIGCOMP_INSTR_OR 2 -#define SIGCOMP_INSTR_NOT 3 -#define SIGCOMP_INSTR_LSHIFT 4 -#define SIGCOMP_INSTR_RSHIFT 5 -#define SIGCOMP_INSTR_ADD 6 -#define SIGCOMP_INSTR_SUBTRACT 7 -#define SIGCOMP_INSTR_MULTIPLY 8 -#define SIGCOMP_INSTR_DIVIDE 9 -#define SIGCOMP_INSTR_REMAINDER 10 -#define SIGCOMP_INSTR_SORT_ASCENDING 11 -#define SIGCOMP_INSTR_SORT_DESCENDING 12 -#define SIGCOMP_INSTR_SHA_1 13 -#define SIGCOMP_INSTR_LOAD 14 -#define SIGCOMP_INSTR_MULTILOAD 15 -#define SIGCOMP_INSTR_PUSH 16 -#define SIGCOMP_INSTR_POP 17 -#define SIGCOMP_INSTR_COPY 18 -#define SIGCOMP_INSTR_COPY_LITERAL 19 -#define SIGCOMP_INSTR_COPY_OFFSET 20 -#define SIGCOMP_INSTR_MEMSET 21 -#define SIGCOMP_INSTR_JUMP 22 -#define SIGCOMP_INSTR_COMPARE 23 -#define SIGCOMP_INSTR_CALL 24 -#define SIGCOMP_INSTR_RETURN 25 -#define SIGCOMP_INSTR_SWITCH 26 -#define SIGCOMP_INSTR_CRC 27 -#define SIGCOMP_INSTR_INPUT_BYTES 28 -#define SIGCOMP_INSTR_INPUT_BITS 29 -#define SIGCOMP_INSTR_INPUT_HUFFMAN 30 -#define SIGCOMP_INSTR_STATE_ACCESS 31 -#define SIGCOMP_INSTR_STATE_CREATE 32 -#define SIGCOMP_INSTR_STATE_FREE 33 -#define SIGCOMP_INSTR_OUTPUT 34 -#define SIGCOMP_INSTR_END_MESSAGE 35 - - -static gboolean print_level_1; -static gboolean print_level_2; -static gboolean print_level_3; -static gint show_instr_detail_level; - -/* Internal result code values of decompression failures */ -const value_string result_code_vals[] = { - { 0, "No decompression failure" }, - { 1, "Partial state length less than 6 or greater than 20 bytes long" }, - { 2, "No state match" }, - { 3, "state_begin + state_length > size of state" }, - { 4, "Operand_2 is Zero" }, - { 5, "Switch statement failed j >= n" }, - { 6, "Attempt to jump outside of UDVM memory" }, - { 7, "L in input-bits > 16" }, - { 8, "input_bit_order > 7" }, - { 9, "Instruction Decompression failure encountered" }, - {10, "Input huffman failed j > n" }, - {11, "Input bits requested beyond end of message" }, - {12, "more than four state creation requests are made before the END-MESSAGE instruction" }, - {13, "state_retention_priority is 65535" }, - {14, "Input bytes requested beyond end of message" }, - {15, "Maximum number of UDVM cycles reached" }, - {16, "UDVM stack underflow" }, - {17, "state_length is 0, but state_begin is non-zero" }, - { 255, "This branch isn't coded yet" }, - { 0, NULL } -}; - -static int decode_udvm_literal_operand(guint8 *buff,guint operand_address, guint16 *value); -static int dissect_udvm_reference_operand(guint8 *buff,guint operand_address, guint16 *value, guint *result_dest); -static int decode_udvm_multitype_operand(guint8 *buff,guint operand_address,guint16 *value); -static int decode_udvm_address_operand(guint8 *buff,guint operand_address, guint16 *value,guint current_address); -static int decomp_dispatch_get_bits(tvbuff_t *message_tvb,proto_tree *udvm_tree,guint8 bit_order, - guint8 *buff,guint16 *old_input_bit_order, guint16 *remaining_bits, - guint16 *input_bits, guint *input_address, guint16 length, guint16 *result_code,guint msg_end); - - -tvbuff_t* -decompress_sigcomp_message(tvbuff_t *bytecode_tvb, tvbuff_t *message_tvb, packet_info *pinfo, - proto_tree *udvm_tree, gint udvm_mem_dest, - gint print_flags, gint hf_id, - gint header_len, - gint byte_code_state_len, gint byte_code_id_len, - gint udvm_start_ip) -{ - tvbuff_t *decomp_tvb; - /* UDVM memory must be initialised to zero */ - guint8 *buff = (guint8 *)wmem_alloc0(wmem_packet_scope(), UDVM_MEMORY_SIZE); - char string[2]; - guint8 *out_buff; /* Largest allowed size for a message is UDVM_MEMORY_SIZE = 65536 */ - guint32 i = 0; - guint16 n = 0; - guint16 m = 0; - guint16 x; - guint k = 0; - guint16 H; - guint16 oldH; - guint offset = 0; - guint result_dest; - guint code_length =0; - guint8 current_instruction; - guint current_address; - guint operand_address; - guint input_address; - guint16 output_address = 0; - guint next_operand_address; - guint8 octet; - guint8 msb; - guint8 lsb; - guint16 byte_copy_right; - guint16 byte_copy_left; - guint16 input_bit_order; - guint16 stack_location; - guint16 stack_fill; - guint16 result; - guint msg_end = tvb_reported_length_remaining(message_tvb, 0); - guint16 result_code = 0; - guint16 old_input_bit_order = 0; - guint16 remaining_bits = 0; - guint16 input_bits = 0; - guint8 bit_order = 0; - gboolean outside_huffman_boundaries = TRUE; - gboolean print_in_loop = FALSE; - guint16 instruction_address; - guint8 no_of_state_create = 0; - guint16 state_length_buff[5]; - guint16 state_address_buff[5]; - guint16 state_instruction_buff[5]; - guint16 state_minimum_access_length_buff[5]; - /* guint16 state_state_retention_priority_buff[5]; */ - guint32 used_udvm_cycles = 0; - guint cycles_per_bit; - guint maximum_UDVM_cycles; - guint8 *sha1buff; - unsigned char sha1_digest_buf[STATE_BUFFER_SIZE]; - sha1_context ctx; - - - /* UDVM operand variables */ - guint16 length; - guint16 at_address; - guint16 destination; - guint16 addr; - guint16 value; - guint16 p_id_start; - guint16 p_id_length; - guint16 state_begin; - guint16 state_length; - guint16 state_address; - guint16 state_instruction; - guint16 operand_1; - guint16 operand_2; - guint16 value_1; - guint16 value_2; - guint16 at_address_1; - guint16 at_address_2; - guint16 at_address_3; - guint16 j; - guint16 bits_n; - guint16 lower_bound_n; - guint16 upper_bound_n; - guint16 uncompressed_n; - guint16 position; - guint16 ref_destination; /* could I have used $destination ? */ - guint16 multy_offset; - guint16 output_start; - guint16 output_length; - guint16 minimum_access_length; - guint16 state_retention_priority; - guint16 requested_feedback_location; - guint16 returned_parameters_location; - guint16 start_value; - - - /* Set print parameters */ - print_level_1 = FALSE; - print_level_2 = FALSE; - print_level_3 = FALSE; - show_instr_detail_level = 0; - - - - switch( print_flags ) { - case 0: - break; - - case 1: - print_level_1 = TRUE; - show_instr_detail_level = 1; - break; - case 2: - print_level_1 = TRUE; - print_level_2 = TRUE; - show_instr_detail_level = 1; - break; - case 3: - print_level_1 = TRUE; - print_level_2 = TRUE; - print_level_3 = TRUE; - show_instr_detail_level = 2; - break; - default: - print_level_1 = TRUE; - show_instr_detail_level = 1; - break; - } - - /* Set initial UDVM data - * The first 32 bytes of UDVM memory are then initialized to special - * values as illustrated in Figure 5. - * - * 0 7 8 15 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | UDVM_memory_size | 0 - 1 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | cycles_per_bit | 2 - 3 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | SigComp_version | 4 - 5 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | partial_state_ID_length | 6 - 7 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | state_length | 8 - 9 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | | - * : reserved : 10 - 31 - * | | - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * - * Figure 5: Initializing Useful Values in UDVM memory - */ - /* UDVM_memory_size */ - buff[0] = (UDVM_MEMORY_SIZE >> 8) & 0x00FF; - buff[1] = UDVM_MEMORY_SIZE & 0x00FF; - /* cycles_per_bit */ - buff[2] = 0; - buff[3] = 16; - /* SigComp_version */ - buff[4] = 0; - buff[5] = 1; - /* partial_state_ID_length */ - buff[6] = (byte_code_id_len >> 8) & 0x00FF; - buff[7] = byte_code_id_len & 0x00FF; - /* state_length */ - buff[8] = (byte_code_state_len >> 8) & 0x00FF; - buff[9] = byte_code_state_len & 0x00FF; - - code_length = tvb_reported_length_remaining(bytecode_tvb, 0); - - cycles_per_bit = buff[2] << 8; - cycles_per_bit = cycles_per_bit | buff[3]; - /* - * maximum_UDVM_cycles = (8 * n + 1000) * cycles_per_bit - */ - maximum_UDVM_cycles = (( 8 * (header_len + msg_end) ) + 1000) * cycles_per_bit; - - proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"maximum_UDVM_cycles(%u) = (( 8 * msg_end(%u) ) + 1000) * cycles_per_bit(%u)",maximum_UDVM_cycles,msg_end,cycles_per_bit); - proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"Message Length: %u,Byte code length: %u, Maximum UDVM cycles: %u",msg_end,code_length,maximum_UDVM_cycles); - - /* Load bytecode into UDVM starting at "udvm_mem_dest" */ - i = udvm_mem_dest; - if ( print_level_3 ) - proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"Load bytecode into UDVM starting at %u",i); - while ( code_length > offset && i < UDVM_MEMORY_SIZE ) { - buff[i] = tvb_get_guint8(bytecode_tvb, offset); - if ( print_level_3 ) - proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1, - " Addr: %u Instruction code(0x%0x) ", i, buff[i]); - - i++; - offset++; - - } - /* Start executing code */ - current_address = udvm_start_ip; - input_address = 0; - - proto_tree_add_text(udvm_tree, bytecode_tvb, offset, 1,"UDVM EXECUTION STARTED at Address: %u Message size %u", - current_address, msg_end); - - /* Largest allowed size for a message is UDVM_MEMORY_SIZE = 65536 */ - out_buff = (guint8 *)g_malloc(UDVM_MEMORY_SIZE); - -execute_next_instruction: - - if ( used_udvm_cycles > maximum_UDVM_cycles ){ - result_code = 15; - goto decompression_failure; - } - used_udvm_cycles++; - current_instruction = buff[current_address & 0xffff]; - - switch ( current_instruction ) { - case SIGCOMP_INSTR_DECOMPRESSION_FAILURE: - if ( result_code == 0 ) - result_code = 9; - proto_tree_add_text(udvm_tree, NULL, 0, 0, - "Addr: %u ## DECOMPRESSION-FAILURE(0)", - current_address); - proto_tree_add_text(udvm_tree, NULL, 0, 0,"Wireshark UDVM diagnostic: %s.", - val_to_str(result_code, result_code_vals,"Unknown (%u)")); - if ( output_address > 0 ){ - /* At least something got decompressed, show it */ - decomp_tvb = tvb_new_child_real_data(message_tvb, out_buff,output_address,output_address); - /* Arrange that the allocated packet data copy be freed when the - * tvbuff is freed. - */ - tvb_set_free_cb( decomp_tvb, g_free ); - /* Add the tvbuff to the list of tvbuffs to which the tvbuff we - * were handed refers, so it'll get cleaned up when that tvbuff - * is cleaned up. - */ - add_new_data_source(pinfo, decomp_tvb, "Decompressed SigComp message(Incomplete)"); - proto_tree_add_text(udvm_tree, decomp_tvb, 0, -1,"SigComp message Decompression failure"); - return decomp_tvb; - } - g_free(out_buff); - return NULL; - break; - - case SIGCOMP_INSTR_AND: /* 1 AND ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## AND(1) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## AND (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 & operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_OR: /* 2 OR ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## OR(2) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## OR (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 | operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_NOT: /* 3 NOT ($operand_1) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## NOT(3) ($operand_1)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## NOT (operand_1=%u)", - current_address, operand_1); - } - /* execute the instruction */ - result = operand_1 ^ 0xffff; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_LSHIFT: /* 4 LSHIFT ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## LSHIFT(4) ($operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## LSHIFT (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 << operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - - break; - case SIGCOMP_INSTR_RSHIFT: /* 5 RSHIFT ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## RSHIFT(5) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## RSHIFT (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 >> operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_ADD: /* 6 ADD ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## ADD(6) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## ADD (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 + operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - - case SIGCOMP_INSTR_SUBTRACT: /* 7 SUBTRACT ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SUBTRACT(7) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SUBTRACT (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* execute the instruction */ - result = operand_1 - operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_MULTIPLY: /* 8 MULTIPLY ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ##MULTIPLY(8) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## MULTIPLY (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* - * execute the instruction - * MULTIPLY (m, n) := m * n (modulo 2^16) - */ - if ( operand_2 == 0){ - result_code = 4; - goto decompression_failure; - } - result = operand_1 * operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_DIVIDE: /* 9 DIVIDE ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## DIVIDE(9) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## DIVIDE (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* - * execute the instruction - * DIVIDE (m, n) := floor(m / n) - * Decompression failure occurs if a DIVIDE or REMAINDER instruction - * encounters an operand_2 that is zero. - */ - if ( operand_2 == 0){ - result_code = 4; - goto decompression_failure; - } - result = operand_1 / operand_2; - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_REMAINDER: /* 10 REMAINDER ($operand_1, %operand_2) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## REMAINDER(10) (operand_1, operand_2)", - current_address); - } - /* $operand_1*/ - operand_address = current_address + 1; - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &operand_1, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_1 %u", - operand_address, operand_1); - } - operand_address = next_operand_address; - /* %operand_2*/ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &operand_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u operand_2 %u", - operand_address, operand_2); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## REMAINDER (operand_1=%u, operand_2=%u)", - current_address, operand_1, operand_2); - } - /* - * execute the instruction - * REMAINDER (m, n) := m - n * floor(m / n) - * Decompression failure occurs if a DIVIDE or REMAINDER instruction - * encounters an operand_2 that is zero. - */ - if ( operand_2 == 0){ - result_code = 4; - goto decompression_failure; - } - result = operand_1 - operand_2 * (operand_1 / operand_2); - lsb = result & 0xff; - msb = result >> 8; - buff[result_dest] = msb; - buff[(result_dest+1) & 0xffff] = lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading result %u at %u", - result, result_dest); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_SORT_ASCENDING: /* 11 SORT-ASCENDING (%start, %n, %k) */ - /* - * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) - */ - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SORT-ASCENDING(11) (start, n, k))", - current_address); - } - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Execution of this instruction is NOT implemented"); - /* - * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) - */ - break; - - case SIGCOMP_INSTR_SORT_DESCENDING: /* 12 SORT-DESCENDING (%start, %n, %k) */ - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SORT-DESCENDING(12) (start, n, k))", - current_address); - } - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Execution of this instruction is NOT implemented"); - /* - * used_udvm_cycles = 1 + k * (ceiling(log2(k)) + n) - */ - break; - case SIGCOMP_INSTR_SHA_1: /* 13 SHA-1 (%position, %length, %destination) */ - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SHA-1(13) (position, length, destination)", - current_address); - } - operand_address = current_address + 1; - /* %position */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", - operand_address, position); - } - operand_address = next_operand_address; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - /* $destination */ - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &ref_destination, &result_dest); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u $destination %u", - operand_address, ref_destination); - } - used_udvm_cycles = used_udvm_cycles + length; - - n = 0; - k = position; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, 0, -1, - "byte_copy_right = %u", byte_copy_right); - } - - sha1_starts( &ctx ); - - while (n<length) { - guint16 handle_now = length; - - if ( k < byte_copy_right && byte_copy_right <= k + (length-n) ){ - handle_now = byte_copy_right - position; - } - - if (k + handle_now >= UDVM_MEMORY_SIZE) - goto decompression_failure; - sha1_update( &ctx, &buff[k], handle_now ); - - k = ( k + handle_now ) & 0xffff; - n = ( n + handle_now ) & 0xffff; - - if ( k >= byte_copy_right ) { - k = byte_copy_left; - } - } - - sha1_finish( &ctx, sha1_digest_buf ); - - k = ref_destination; - - for ( n=0; n< STATE_BUFFER_SIZE; n++ ) { - - buff[k] = sha1_digest_buf[n]; - - k = ( k + 1 ) & 0xffff; - n++; - - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - } - - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, 0, -1, - "Calculated SHA-1: %s", - bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_BUFFER_SIZE)); - } - - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_LOAD: /* 14 LOAD (%address, %value) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## LOAD(14) (%%address, %%value)", - current_address); - } - operand_address = current_address + 1; - /* %address */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", - operand_address, addr); - } - operand_address = next_operand_address; - /* %value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## LOAD (%%address=%u, %%value=%u)", - current_address, addr, value); - } - lsb = value & 0xff; - msb = value >> 8; - - buff[addr] = msb; - buff[(addr + 1) & 0xffff] = lsb; - - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, value); - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Loading bytes at %u Value %u 0x%x", - addr, value, value); - } - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_MULTILOAD: /* 15 MULTILOAD (%address, #n, %value_0, ..., %value_n-1) */ - /* RFC 3320: - * The MULTILOAD instruction sets a contiguous block of 2-byte words in - * the UDVM memory to specified values. - * Hmm what if the value to load only takes one byte ? Chose to always load two bytes. - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## MULTILOAD(15) (%%address, #n, value_0, ..., value_n-1)", - current_address); - } - operand_address = current_address + 1; - /* %address */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", - operand_address, addr); - } - operand_address = next_operand_address; - - /* #n */ - next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", - operand_address, n); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## MULTILOAD (%%address=%u, #n=%u, value_0, ..., value_%d)", - current_address, addr, n, n-1); - } - operand_address = next_operand_address; - used_udvm_cycles = used_udvm_cycles + n; - while ( n > 0) { - n = n - 1; - /* %value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); - lsb = value & 0xff; - msb = value >> 8; - - if (addr >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - - buff[addr] = msb; - buff[(addr + 1) & 0xffff] = lsb; - /* debug - */ - length = next_operand_address - operand_address; - - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, "Addr: %u Value %5u - Loading bytes at %5u Value %5u 0x%x", - operand_address, value, addr, value, value); - } - addr = addr + 2; - operand_address = next_operand_address; - } - current_address = next_operand_address; - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_PUSH: /* 16 PUSH (%value) */ - if (show_instr_detail_level == 2){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## PUSH(16) (value)", - current_address); - } - operand_address = current_address + 1; - /* %value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); - if (show_instr_detail_level == 2){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, value); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## PUSH (value=%u)", - current_address, value); - } - current_address = next_operand_address; - - /* Push the value address onto the stack */ - stack_location = (buff[70] << 8) | buff[71]; - stack_fill = (buff[stack_location] << 8) - | buff[(stack_location+1) & 0xFFFF]; - addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; - - if (addr >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - - buff[addr] = (value >> 8) & 0x00FF; - buff[(addr+1) & 0xFFFF] = value & 0x00FF; - - if (stack_location >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - - stack_fill = (stack_fill + 1) & 0xFFFF; - buff[stack_location] = (stack_fill >> 8) & 0x00FF; - buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; - - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_POP: /* 17 POP (%address) */ - if (show_instr_detail_level == 2){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## POP(16) (value)", - current_address); - } - operand_address = current_address + 1; - /* %value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); - if (show_instr_detail_level == 2){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, destination); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## POP (address=%u)", - current_address, destination); - } - current_address = next_operand_address; - - /* Pop value from the top of the stack */ - stack_location = (buff[70] << 8) | buff[71]; - stack_fill = (buff[stack_location] << 8) - | buff[(stack_location+1) & 0xFFFF]; - if (stack_fill == 0) - { - result_code = 16; - goto decompression_failure; - } - - if (stack_location >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - - stack_fill = (stack_fill - 1) & 0xFFFF; - buff[stack_location] = (stack_fill >> 8) & 0x00FF; - buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; - - addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; - - if (addr >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - - value = (buff[addr] << 8) - | buff[(addr+1) & 0xFFFF]; - - /* ... and store the popped value. */ - if (destination >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[destination] = (value >> 8) & 0x00FF; - buff[(destination+1) & 0xFFFF] = value & 0x00FF; - - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_COPY: /* 18 COPY (%position, %length, %destination) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY(18) (position, length, destination)", - current_address); - } - operand_address = current_address + 1; - /* %position */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", - operand_address, position); - } - operand_address = next_operand_address; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - /* %destination */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", - operand_address, destination); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY (position=%u, length=%u, destination=%u)", - current_address, position, length, destination); - } - current_address = next_operand_address; - /* - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - n = 0; - k = destination; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_right = %u", byte_copy_right); - } - - while ( n < length ){ - buff[k] = buff[position]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Copying value: %u (0x%x) to Addr: %u", - buff[position], buff[position], k); - } - position = ( position + 1 ) & 0xffff; - k = ( k + 1 ) & 0xffff; - n++; - - /* - * Check for circular buffer wrapping after the positions are - * incremented. If either started at BCR then they should continue - * to increment beyond BCR. - */ - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - if ( position == byte_copy_right ){ - position = byte_copy_left; - } - } - used_udvm_cycles = used_udvm_cycles + length; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_COPY_LITERAL: /* 19 COPY-LITERAL (%position, %length, $destination) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY-LITERAL(19) (position, length, $destination)", - current_address); - } - operand_address = current_address + 1; - /* %position */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", - operand_address, position); - } - operand_address = next_operand_address; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - - /* $destination */ - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &ref_destination, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u destination %u", - operand_address, ref_destination); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY-LITERAL (position=%u, length=%u, $destination=%u)", - current_address, position, length, ref_destination); - } - current_address = next_operand_address; - - - /* - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - n = 0; - k = ref_destination; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_right = %u", byte_copy_right); - } - while ( n < length ){ - - buff[k] = buff[position]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Copying value: %u (0x%x) to Addr: %u", - buff[position], buff[position], k); - } - position = ( position + 1 ) & 0xffff; - k = ( k + 1 ) & 0xffff; - n++; - - /* - * Check for circular buffer wrapping after the positions are - * incremented. It is important that k cannot be left set - * to BCR. Also, if either started at BCR then they should continue - * to increment beyond BCR. - */ - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - if ( position == byte_copy_right ){ - position = byte_copy_left; - } - } - buff[result_dest] = k >> 8; - buff[(result_dest + 1) & 0xffff] = k & 0x00ff; - - used_udvm_cycles = used_udvm_cycles + length; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_COPY_OFFSET: /* 20 COPY-OFFSET (%offset, %length, $destination) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY-OFFSET(20) (offset, length, $destination)", - current_address); - } - operand_address = current_address + 1; - /* %offset */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &multy_offset); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u offset %u", - operand_address, multy_offset); - } - operand_address = next_operand_address; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - - /* $destination */ - next_operand_address = dissect_udvm_reference_operand(buff, operand_address, &ref_destination, &result_dest); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u $destination %u", - operand_address, ref_destination); - } - - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COPY-OFFSET (offset=%u, length=%u, $destination=%u)", - current_address, multy_offset, length, result_dest); - } - current_address = next_operand_address; - - /* Execute the instruction: - * To derive the value of the position operand, starting at the memory - * address specified by destination, the UDVM counts backwards a total - * of offset memory addresses. - * - * If the memory address specified in byte_copy_left is reached, the - * next memory address is taken to be (byte_copy_right - 1) modulo 2^16. - */ - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - - /* - * In order to work out the position, simple arithmetic is tricky - * to apply because there some nasty corner cases. A simple loop - * is inefficient but the logic is simple. - * - * FUTURE: This could be optimised. - */ - for (position = ref_destination, i = 0; i < multy_offset; i++) - { - if ( position == byte_copy_left ) - { - position = (byte_copy_right - 1) & 0xffff; - } - else - { - position = (position - 1) & 0xffff; - } - } - - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_left = %u byte_copy_right = %u position= %u", - byte_copy_left, byte_copy_right, position); - } - /* The COPY-OFFSET instruction then behaves as a COPY-LITERAL - * instruction, taking the value of the position operand to be the last - * memory address reached in the above step. - */ - - /* - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - n = 0; - k = ref_destination; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_left = %u byte_copy_right = %u", byte_copy_left, byte_copy_right); - } - while ( n < length ){ - buff[k] = buff[position]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Copying value: %5u (0x%x) from Addr: %u to Addr: %u", - buff[position], buff[position],(position), k); - } - n++; - k = ( k + 1 ) & 0xffff; - position = ( position + 1 ) & 0xffff; - - /* - * Check for circular buffer wrapping after the positions are - * incremented. It is important that k cannot be left set - * to BCR. Also, if either started at BCR then they should continue - * to increment beyond BCR. - */ - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - if ( position == byte_copy_right ){ - position = byte_copy_left; - } - } - buff[result_dest] = k >> 8; - buff[result_dest + 1] = k & 0x00ff; - used_udvm_cycles = used_udvm_cycles + length; - goto execute_next_instruction; - - break; - case SIGCOMP_INSTR_MEMSET: /* 21 MEMSET (%address, %length, %start_value, %offset) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## MEMSET(21) (address, length, start_value, offset)", - current_address); - } - operand_address = current_address + 1; - - /* %address */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &addr); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Address %u", - operand_address, addr); - } - operand_address = next_operand_address; - - /* %length, */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - /* %start_value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &start_value); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u start_value %u", - operand_address, start_value); - } - operand_address = next_operand_address; - - /* %offset */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &multy_offset); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u offset %u", - operand_address, multy_offset); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## MEMSET (address=%u, length=%u, start_value=%u, offset=%u)", - current_address, addr, length, start_value, multy_offset); - } - current_address = next_operand_address; - /* exetute the instruction - * The sequence of values used by the MEMSET instruction is specified by - * the following formula: - * - * Seq[n] := (start_value + n * offset) modulo 256 - */ - n = 0; - k = addr; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_left = %u byte_copy_right = %u", byte_copy_left, byte_copy_right); - } - while ( n < length ){ - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - buff[k] = (start_value + ( n * multy_offset)) & 0xff; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Storing value: %u (0x%x) at Addr: %u", - buff[k], buff[k], k); - } - k = ( k + 1 ) & 0xffff; - n++; - }/* end while */ - used_udvm_cycles = used_udvm_cycles + length; - goto execute_next_instruction; - break; - - - case SIGCOMP_INSTR_JUMP: /* 22 JUMP (@address) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## JUMP(22) (@address)", - current_address); - } - operand_address = current_address + 1; - /* @address */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - /*next_operand_address = */decode_udvm_address_operand(buff,operand_address, &at_address, current_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## JUMP (@address=%u)", - current_address, at_address); - } - current_address = at_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_COMPARE: /* 23 */ - /* COMPARE (%value_1, %value_2, @address_1, @address_2, @address_3) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COMPARE(23) (value_1, value_2, @address_1, @address_2, @address_3)", - current_address); - } - operand_address = current_address + 1; - - /* %value_1 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value_1); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, value_1); - } - operand_address = next_operand_address; - - /* %value_2 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value_2); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, value_2); - } - operand_address = next_operand_address; - - /* @address_1 */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_1); - at_address_1 = ( current_address + at_address_1) & 0xffff; - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address_1); - } - operand_address = next_operand_address; - - - /* @address_2 */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_2); - at_address_2 = ( current_address + at_address_2) & 0xffff; - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address_2); - } - operand_address = next_operand_address; - - /* @address_3 */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - /*next_operand_address = */decode_udvm_multitype_operand(buff, operand_address, &at_address_3); - at_address_3 = ( current_address + at_address_3) & 0xffff; - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address_3); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## COMPARE (value_1=%u, value_2=%u, @address_1=%u, @address_2=%u, @address_3=%u)", - current_address, value_1, value_2, at_address_1, at_address_2, at_address_3); - } - /* execute the instruction - * If value_1 < value_2 then the UDVM continues instruction execution at - * the memory address specified by address 1. If value_1 = value_2 then - * it jumps to the address specified by address_2. If value_1 > value_2 - * then it jumps to the address specified by address_3. - */ - if ( value_1 < value_2 ) - current_address = at_address_1; - if ( value_1 == value_2 ) - current_address = at_address_2; - if ( value_1 > value_2 ) - current_address = at_address_3; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_CALL: /* 24 CALL (@address) (PUSH addr )*/ - if (show_instr_detail_level == 2){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## CALL(24) (@address) (PUSH addr )", - current_address); - } - operand_address = current_address + 1; - /* @address */ - next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## CALL (@address=%u)", - current_address, at_address); - } - current_address = next_operand_address; - - /* Push the current address onto the stack */ - stack_location = (buff[70] << 8) | buff[71]; - stack_fill = (buff[stack_location] << 8) - | buff[(stack_location+1) & 0xFFFF]; - addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; - if (addr >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[addr] = (current_address >> 8) & 0x00FF; - buff[(addr+1) & 0xFFFF] = current_address & 0x00FF; - - stack_fill = (stack_fill + 1) & 0xFFFF; - if (stack_location >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[stack_location] = (stack_fill >> 8) & 0x00FF; - buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; - - /* ... and jump to the destination address */ - current_address = at_address; - - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_RETURN: /* 25 POP and return */ - if (print_level_1 || show_instr_detail_level == 1){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## POP(25) and return", - current_address); - } - - /* Pop value from the top of the stack */ - stack_location = (buff[70] << 8) | buff[71]; - stack_fill = (buff[stack_location] << 8) - | buff[(stack_location+1) & 0xFFFF]; - if (stack_fill == 0) - { - result_code = 16; - goto decompression_failure; - } - - stack_fill = (stack_fill - 1) & 0xFFFF; - if (stack_location >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[stack_location] = (stack_fill >> 8) & 0x00FF; - buff[(stack_location+1) & 0xFFFF] = stack_fill & 0x00FF; - - addr = (stack_location + stack_fill * 2 + 2) & 0xFFFF; - at_address = (buff[addr] << 8) - | buff[(addr+1) & 0xFFFF]; - - /* ... and set the PC to the popped value */ - current_address = at_address; - - goto execute_next_instruction; - - break; - - case SIGCOMP_INSTR_SWITCH: /* 26 SWITCH (#n, %j, @address_0, @address_1, ... , @address_n-1) */ - /* - * When a SWITCH instruction is encountered the UDVM reads the value of - * j. It then continues instruction execution at the address specified - * by address j. - * - * Decompression failure occurs if j specifies a value of n or more, or - * if the address lies beyond the overall UDVM memory size. - */ - instruction_address = current_address; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## SWITCH (#n, j, @address_0, @address_1, ... , @address_n-1))", - current_address); - } - operand_address = current_address + 1; - /* #n - * Number of addresses in the instruction - */ - next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", - operand_address, n); - } - operand_address = next_operand_address; - /* %j */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &j); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u j %u", - operand_address, j); - } - operand_address = next_operand_address; - m = 0; - while ( m < n ){ - /* @address_n-1 */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address_1); - at_address_1 = ( instruction_address + at_address_1) & 0xffff; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address_1); - } - if ( j == m ){ - current_address = at_address_1; - } - operand_address = next_operand_address; - m++; - } - /* Check decompression failure */ - if ( ( j == n ) || ( j > n )){ - result_code = 5; - goto decompression_failure; - } - if ( current_address > UDVM_MEMORY_SIZE ){ - result_code = 6; - goto decompression_failure; - } - used_udvm_cycles = used_udvm_cycles + n; - - goto execute_next_instruction; - - break; - case SIGCOMP_INSTR_CRC: /* 27 CRC (%value, %position, %length, @address) */ - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## CRC (value, position, length, @address)", - current_address); - } - - operand_address = current_address + 1; - - /* %value */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &value); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Value %u", - operand_address, value); - } - operand_address = next_operand_address; - - /* %position */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &position); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u position %u", - operand_address, position); - } - operand_address = next_operand_address; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - /* @address */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address); - at_address = ( current_address + at_address) & 0xffff; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - used_udvm_cycles = used_udvm_cycles + length; - - n = 0; - k = position; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - result = 0; - - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, 0, -1, - "byte_copy_right = %u", byte_copy_right); - } - - while (n<length) { - - guint16 handle_now = length - n; - - if ( k < byte_copy_right && byte_copy_right <= k + (length-n) ){ - handle_now = byte_copy_right - k; - } - - if (k + handle_now >= UDVM_MEMORY_SIZE) - goto decompression_failure; - result = crc16_ccitt_seed(&buff[k], handle_now, (guint16) (result ^ 0xffff)); - - k = ( k + handle_now ) & 0xffff; - n = ( n + handle_now ) & 0xffff; - - if ( k >= byte_copy_right ) { - k = byte_copy_left; - } - } - - result = result ^ 0xffff; - - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, "Calculated CRC %u", result); - } - if (result != value){ - current_address = at_address; - } - else { - current_address = next_operand_address; - } - goto execute_next_instruction; - break; - - - case SIGCOMP_INSTR_INPUT_BYTES: /* 28 INPUT-BYTES (%length, %destination, @address) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-BYTES(28) length, destination, @address)", - current_address); - } - operand_address = current_address + 1; - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Length %u", - operand_address, length); - } - operand_address = next_operand_address; - - /* %destination */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", - operand_address, destination); - } - operand_address = next_operand_address; - - /* @address */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &at_address); - at_address = ( current_address + at_address) & 0xffff; - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-BYTES length=%u, destination=%u, @address=%u)", - current_address, length, destination, at_address); - } - /* execute the instruction TODO insert checks - * RFC 3320 : - * - * 0 7 8 15 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | byte_copy_left | 64 - 65 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | byte_copy_right | 66 - 67 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | input_bit_order | 68 - 69 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | stack_location | 70 - 71 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * - * Figure 7: Memory addresses of the UDVM registers - * : - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - n = 0; - k = destination; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_right = %u", byte_copy_right); - } - /* clear out remaining bits if any */ - remaining_bits = 0; - input_bits=0; - /* operand_address used as dummy */ - while ( n < length ){ - if (input_address > ( msg_end - 1)){ - current_address = at_address; - result_code = 14; - goto execute_next_instruction; - } - - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - octet = tvb_get_guint8(message_tvb, input_address); - buff[k] = octet; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Loading value: %u (0x%x) at Addr: %u", octet, octet, k); - } - input_address++; - /* - * If the instruction requests data that lies beyond the end of the - * SigComp message, no data is returned. Instead the UDVM moves program - * execution to the address specified by the address operand. - */ - - - k = ( k + 1 ) & 0xffff; - n++; - } - used_udvm_cycles = used_udvm_cycles + length; - current_address = next_operand_address; - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_INPUT_BITS:/* 29 INPUT-BITS (%length, %destination, @address) */ - /* - * The length operand indicates the requested number of bits. - * Decompression failure occurs if this operand does not lie between 0 - * and 16 inclusive. - * - * The destination operand specifies the memory address to which the - * compressed data should be copied. Note that the requested bits are - * interpreted as a 2-byte integer ranging from 0 to 2^length - 1, as - * explained in Section 8.2. - * - * If the instruction requests data that lies beyond the end of the - * SigComp message, no data is returned. Instead the UDVM moves program - * execution to the address specified by the address operand. - */ - - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-BITS(29) (length, destination, @address)", - current_address); - } - operand_address = current_address + 1; - - /* %length */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u length %u", - operand_address, length); - } - operand_address = next_operand_address; - /* %destination */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", - operand_address, destination); - } - operand_address = next_operand_address; - - /* @address */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-BITS length=%u, destination=%u, @address=%u)", - current_address, length, destination, at_address); - } - current_address = next_operand_address; - - /* - * Execute actual instr. - * The input_bit_order register contains the following three flags: - * - * 0 7 8 15 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | reserved |F|H|P| 68 - 69 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - */ - input_bit_order = buff[68] << 8; - input_bit_order = input_bit_order | buff[69]; - /* - * If the instruction requests data that lies beyond the end of the - * SigComp message, no data is returned. Instead the UDVM moves program - * execution to the address specified by the address operand. - */ - - if ( length > 16 ){ - result_code = 7; - goto decompression_failure; - } - if ( input_bit_order > 7 ){ - result_code = 8; - goto decompression_failure; - } - - /* - * Transfer F bit to bit_order to tell decomp dispatcher which bit order to use - */ - bit_order = ( input_bit_order & 0x0004 ) >> 2; - value = decomp_dispatch_get_bits( message_tvb, udvm_tree, bit_order, - buff, &old_input_bit_order, &remaining_bits, - &input_bits, &input_address, length, &result_code, msg_end); - if ( result_code == 11 ){ - current_address = at_address; - goto execute_next_instruction; - } - msb = value >> 8; - lsb = value & 0x00ff; - if (destination >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[destination] = msb; - buff[(destination + 1) & 0xffff]=lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Loading value: %u (0x%x) at Addr: %u, remaining_bits: %u", value, value, destination, remaining_bits); - } - - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_INPUT_HUFFMAN: /* 30 */ - /* - * INPUT-HUFFMAN (%destination, @address, #n, %bits_1, %lower_bound_1, - * %upper_bound_1, %uncompressed_1, ... , %bits_n, %lower_bound_n, - * %upper_bound_n, %uncompressed_n) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-HUFFMAN (destination, @address, #n, bits_1, lower_bound_1,upper_bound_1, uncompressed_1, ... , bits_n, lower_bound_n,upper_bound_n, uncompressed_n)", - current_address); - } - operand_address = current_address + 1; - - /* %destination */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &destination); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u Destination %u", - operand_address, destination); - } - operand_address = next_operand_address; - - /* @address */ - /* operand_value = (memory_address_of_instruction + D) modulo 2^16 */ - next_operand_address = decode_udvm_address_operand(buff,operand_address, &at_address, current_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u @Address %u", - operand_address, at_address); - } - operand_address = next_operand_address; - - /* #n */ - next_operand_address = decode_udvm_literal_operand(buff,operand_address, &n); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u n %u", - operand_address, n); - } - operand_address = next_operand_address; - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## INPUT-HUFFMAN (destination=%u, @address=%u, #n=%u, bits_1, lower_1,upper_1, unc_1, ... , bits_%d, lower_%d,upper_%d, unc_%d)", - current_address, destination, at_address, n, n, n, n, n); - } - - used_udvm_cycles = used_udvm_cycles + n; - - /* - * Note that if n = 0 then the INPUT-HUFFMAN instruction is ignored and - * program execution resumes at the following instruction. - * Decompression failure occurs if (bits_1 + ... + bits_n) > 16. - * - * In all other cases, the behavior of the INPUT-HUFFMAN instruction is - * defined below: - * - * 1. Set j := 1 and set H := 0. - * - * 2. Request bits_j compressed bits. Interpret the returned bits as an - * integer k from 0 to 2^bits_j - 1, as explained in Section 8.2. - * - * 3. Set H := H * 2^bits_j + k. - * - * 4. If data is requested that lies beyond the end of the SigComp - * message, terminate the INPUT-HUFFMAN instruction and move program - * execution to the memory address specified by the address operand. - * - * 5. If (H < lower_bound_j) or (H > upper_bound_j) then set j := j + 1. - * Then go back to Step 2, unless j > n in which case decompression - * failure occurs. - * - * 6. Copy (H + uncompressed_j - lower_bound_j) modulo 2^16 to the - * memory address specified by the destination operand. - * - */ - /* - * The input_bit_order register contains the following three flags: - * - * 0 7 8 15 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * | reserved |F|H|P| 68 - 69 - * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ - * - * Transfer H bit to bit_order to tell decomp dispatcher which bit order to use - */ - input_bit_order = buff[68] << 8; - input_bit_order = input_bit_order | buff[69]; - bit_order = ( input_bit_order & 0x0002 ) >> 1; - - j = 1; - H = 0; - m = n; - outside_huffman_boundaries = TRUE; - print_in_loop = print_level_3; - while ( m > 0 ){ - /* %bits_n */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &bits_n); - if (print_in_loop ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u bits_n %u", - operand_address, bits_n); - } - operand_address = next_operand_address; - - /* %lower_bound_n */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &lower_bound_n); - if (print_in_loop ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u lower_bound_n %u", - operand_address, lower_bound_n); - } - operand_address = next_operand_address; - /* %upper_bound_n */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &upper_bound_n); - if (print_in_loop ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u upper_bound_n %u", - operand_address, upper_bound_n); - } - operand_address = next_operand_address; - /* %uncompressed_n */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &uncompressed_n); - if (print_in_loop ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u uncompressed_n %u", - operand_address, uncompressed_n); - } - operand_address = next_operand_address; - /* execute instruction */ - if ( outside_huffman_boundaries ) { - /* - * 2. Request bits_j compressed bits. Interpret the returned bits as an - * integer k from 0 to 2^bits_j - 1, as explained in Section 8.2. - */ - k = decomp_dispatch_get_bits( message_tvb, udvm_tree, bit_order, - buff, &old_input_bit_order, &remaining_bits, - &input_bits, &input_address, bits_n, &result_code, msg_end); - if ( result_code == 11 ){ - /* - * 4. If data is requested that lies beyond the end of the SigComp - * message, terminate the INPUT-HUFFMAN instruction and move program - * execution to the memory address specified by the address operand. - */ - current_address = at_address; - goto execute_next_instruction; - } - - /* - * 3. Set H := H * 2^bits_j + k. - * [In practice is a shift+OR operation.] - */ - oldH = H; - H = (H << bits_n) | k; - if (print_level_3 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," Set H(%u) := H(%u) * 2^bits_j(%u) + k(%u)", - H ,oldH, 1<<bits_n,k); - } - - /* - * 5. If (H < lower_bound_j) or (H > upper_bound_j) then set j := j + 1. - * Then go back to Step 2, unless j > n in which case decompression - * failure occurs. - */ - if ((H < lower_bound_n) || (H > upper_bound_n)){ - outside_huffman_boundaries = TRUE; - }else{ - outside_huffman_boundaries = FALSE; - print_in_loop = FALSE; - /* - * 6. Copy (H + uncompressed_j - lower_bound_j) modulo 2^16 to the - * memory address specified by the destination operand. - */ - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - " H(%u) = H(%u) + uncompressed_n(%u) - lower_bound_n(%u)", - (H + uncompressed_n - lower_bound_n ),H, uncompressed_n, lower_bound_n); - } - H = H + uncompressed_n - lower_bound_n; - msb = H >> 8; - lsb = H & 0x00ff; - if (destination >= UDVM_MEMORY_SIZE - 1) - goto decompression_failure; - buff[destination] = msb; - buff[(destination + 1) & 0xffff]=lsb; - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " Loading H: %u (0x%x) at Addr: %u,j = %u remaining_bits: %u", - H, H, destination,( n - m + 1 ), remaining_bits); - } - - } - - - } - m = m - 1; - } - if ( outside_huffman_boundaries ) { - result_code = 10; - goto decompression_failure; - } - - current_address = next_operand_address; - goto execute_next_instruction; - break; - - case SIGCOMP_INSTR_STATE_ACCESS: /* 31 */ - /* STATE-ACCESS (%partial_identifier_start, %partial_identifier_length, - * %state_begin, %state_length, %state_address, %state_instruction) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-ACCESS(31) (partial_identifier_start, partial_identifier_length,state_begin, state_length, state_address, state_instruction)", - current_address); - } - operand_address = current_address + 1; - - /* - * %partial_identifier_start - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_start); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_start %u", - operand_address, p_id_start); - } - - /* - * %partial_identifier_length - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_length %u", - operand_address, p_id_length); - } - /* - * %state_begin - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_begin); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_begin %u", - operand_address, state_begin); - } - /* - * %state_length - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", - operand_address, state_length); - } - /* - * %state_address - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", - operand_address, state_address); - } - /* - * %state_instruction - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", - operand_address, state_instruction); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-ACCESS(31) (partial_identifier_start=%u, partial_identifier_length=%u,state_begin=%u, state_length=%u, state_address=%u, state_instruction=%u)", - current_address, p_id_start, p_id_length, state_begin, state_length, state_address, state_instruction); - } - current_address = next_operand_address; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_2 ){ - proto_tree_add_text(udvm_tree, message_tvb, input_address, 1, - " byte_copy_right = %u, byte_copy_left = %u", byte_copy_right,byte_copy_left); - } - - result_code = udvm_state_access(message_tvb, udvm_tree, buff, p_id_start, p_id_length, state_begin, &state_length, - &state_address, &state_instruction, hf_id); - if ( result_code != 0 ){ - goto decompression_failure; - } - used_udvm_cycles = used_udvm_cycles + state_length; - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_STATE_CREATE: /* 32 */ - /* - * STATE-CREATE (%state_length, %state_address, %state_instruction, - * %minimum_access_length, %state_retention_priority) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-CREATE(32) (state_length, state_address, state_instruction,minimum_access_length, state_retention_priority)", - current_address); - } - operand_address = current_address + 1; - - /* - * %state_length - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", - operand_address, state_length); - } - /* - * %state_address - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", - operand_address, state_address); - } - /* - * %state_instruction - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", - operand_address, state_instruction); - } - /* - * %minimum_access_length - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &minimum_access_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u minimum_access_length %u", - operand_address, minimum_access_length); - } - /* - * %state_retention_priority - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_retention_priority); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_retention_priority %u", - operand_address, state_retention_priority); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-CREATE(32) (state_length=%u, state_address=%u, state_instruction=%u,minimum_access_length=%u, state_retention_priority=%u)", - current_address, state_length, state_address, state_instruction,minimum_access_length, state_retention_priority); - } - current_address = next_operand_address; - /* Execute the instruction - * TODO Implement the instruction - * RFC3320: - * Note that the new state item cannot be created until a valid - * compartment identifier has been returned by the application. - * Consequently, when a STATE-CREATE instruction is encountered the UDVM - * simply buffers the five supplied operands until the END-MESSAGE - * instruction is reached. The steps taken at this point are described - * in Section 9.4.9. - * - * Decompression failure MUST occur if more than four state creation - * requests are made before the END-MESSAGE instruction is encountered. - * Decompression failure also occurs if the minimum_access_length does - * not lie between 6 and 20 inclusive, or if the - * state_retention_priority is 65535. - */ - no_of_state_create++; - if ( no_of_state_create > 4 ){ - result_code = 12; - goto decompression_failure; - } - if (( minimum_access_length < 6 ) || ( minimum_access_length > STATE_BUFFER_SIZE )){ - result_code = 1; - goto decompression_failure; - } - if ( state_retention_priority == 65535 ){ - result_code = 13; - goto decompression_failure; - } - state_length_buff[no_of_state_create] = state_length; - state_address_buff[no_of_state_create] = state_address; - state_instruction_buff[no_of_state_create] = state_instruction; - state_minimum_access_length_buff[no_of_state_create] = minimum_access_length; - /* state_state_retention_priority_buff[no_of_state_create] = state_retention_priority; */ - used_udvm_cycles = used_udvm_cycles + state_length; - /* Debug */ - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - n = 0; - k = state_address; - while ( n < state_length ){ - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - string[0]= buff[k]; - string[1]= '\0'; - if (print_level_3 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - " Addr: %5u State value: %u (0x%x) ASCII(%s)", - k,buff[k],buff[k],format_text(string, 1)); - } - k = ( k + 1 ) & 0xffff; - n++; - } - /* End debug */ - - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_STATE_FREE: /* 33 */ - /* - * STATE-FREE (%partial_identifier_start, %partial_identifier_length) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-FREE (partial_identifier_start, partial_identifier_length)", - current_address); - } - operand_address = current_address + 1; - /* - * %partial_identifier_start - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_start); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_start %u", - operand_address, p_id_start); - } - operand_address = next_operand_address; - - /* - * %partial_identifier_length - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &p_id_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u partial_identifier_length %u", - operand_address, p_id_length); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## STATE-FREE (partial_identifier_start=%u, partial_identifier_length=%u)", - current_address, p_id_start, p_id_length); - } - current_address = next_operand_address; - - /* Execute the instruction: - * TODO implement it - */ - udvm_state_free(buff,p_id_start,p_id_length); - - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_OUTPUT: /* 34 OUTPUT (%output_start, %output_length) */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## OUTPUT(34) (output_start, output_length)", - current_address); - } - operand_address = current_address + 1; - /* - * %output_start - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &output_start); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u output_start %u", - operand_address, output_start); - } - operand_address = next_operand_address; - /* - * %output_length - */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &output_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u output_length %u", - operand_address, output_length); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## OUTPUT (output_start=%u, output_length=%u)", - current_address, output_start, output_length); - } - current_address = next_operand_address; - - /* - * Execute instruction - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - n = 0; - k = output_start; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - if (print_level_3 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - " byte_copy_right = %u", byte_copy_right); - } - while ( n < output_length ){ - - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - out_buff[output_address] = buff[k]; - string[0]= buff[k]; - string[1]= '\0'; - if (print_level_3 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - " Output value: %u (0x%x) ASCII(%s) from Addr: %u ,output to dispatcher position %u", - buff[k],buff[k],format_text(string,1), k,output_address); - } - k = ( k + 1 ) & 0xffff; - output_address ++; - n++; - } - used_udvm_cycles = used_udvm_cycles + output_length; - goto execute_next_instruction; - break; - case SIGCOMP_INSTR_END_MESSAGE: /* 35 */ - /* - * END-MESSAGE (%requested_feedback_location, - * %returned_parameters_location, %state_length, %state_address, - * %state_instruction, %minimum_access_length, - * %state_retention_priority) - */ - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## END-MESSAGE (requested_feedback_location,state_instruction, minimum_access_length,state_retention_priority)", - current_address); - } - operand_address = current_address + 1; - - /* %requested_feedback_location */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &requested_feedback_location); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u requested_feedback_location %u", - operand_address, requested_feedback_location); - } - operand_address = next_operand_address; - /* returned_parameters_location */ - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &returned_parameters_location); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u returned_parameters_location %u", - operand_address, returned_parameters_location); - } - /* - * %state_length - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_length %u", - operand_address, state_length); - } - /* - * %state_address - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_address); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_address %u", - operand_address, state_address); - } - /* - * %state_instruction - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &state_instruction); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_instruction %u", - operand_address, state_instruction); - } - - /* - * %minimum_access_length - */ - operand_address = next_operand_address; - next_operand_address = decode_udvm_multitype_operand(buff, operand_address, &minimum_access_length); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u minimum_access_length %u", - operand_address, minimum_access_length); - } - - /* - * %state_retention_priority - */ - operand_address = next_operand_address; - /*next_operand_address =*/ decode_udvm_multitype_operand(buff, operand_address, &state_retention_priority); - if (show_instr_detail_level == 2 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"Addr: %u state_retention_priority %u", - operand_address, state_retention_priority); - } - if (show_instr_detail_level == 1) - { - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1, - "Addr: %u ## END-MESSAGE (requested_feedback_location=%u, returned_parameters_location=%u, state_length=%u, state_address=%u, state_instruction=%u, minimum_access_length=%u, state_retention_priority=%u)", - current_address, requested_feedback_location, returned_parameters_location, state_length, state_address, state_instruction, minimum_access_length,state_retention_priority); - } - /* TODO: This isn't currently totaly correct as END_INSTRUCTION might not create state */ - no_of_state_create++; - if ( no_of_state_create > 4 ){ - result_code = 12; - goto decompression_failure; - } - state_length_buff[no_of_state_create] = state_length; - state_address_buff[no_of_state_create] = state_address; - state_instruction_buff[no_of_state_create] = state_instruction; - /* Not used ? */ - state_minimum_access_length_buff[no_of_state_create] = minimum_access_length; - /* state_state_retention_priority_buff[no_of_state_create] = state_retention_priority; */ - - /* Execute the instruction - */ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"no_of_state_create %u",no_of_state_create); - if ( no_of_state_create != 0 ){ - memset(sha1_digest_buf, 0, STATE_BUFFER_SIZE); - n = 1; - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - while ( n < no_of_state_create + 1 ){ - sha1buff = (guint8 *)g_malloc(state_length_buff[n]+8); - sha1buff[0] = state_length_buff[n] >> 8; - sha1buff[1] = state_length_buff[n] & 0xff; - sha1buff[2] = state_address_buff[n] >> 8; - sha1buff[3] = state_address_buff[n] & 0xff; - sha1buff[4] = state_instruction_buff[n] >> 8; - sha1buff[5] = state_instruction_buff[n] & 0xff; - sha1buff[6] = state_minimum_access_length_buff[n] >> 8; - sha1buff[7] = state_minimum_access_length_buff[n] & 0xff; - if (print_level_3 ){ - for( x=0; x < 8; x++){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"sha1buff %u 0x%x", - x,sha1buff[x]); - } - } - k = state_address_buff[n]; - for( x=0; x < state_length_buff[n]; x++) - { - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - sha1buff[8+x] = buff[k]; - k = ( k + 1 ) & 0xffff; - } - - sha1_starts( &ctx ); - sha1_update( &ctx, (guint8 *) sha1buff, state_length_buff[n] + 8); - sha1_finish( &ctx, sha1_digest_buf ); - if (print_level_3 ){ - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"SHA1 digest %s", bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_BUFFER_SIZE)); - - } -/* begin partial state-id change cco@iptel.org */ -#if 0 - udvm_state_create(sha1buff, sha1_digest_buf, state_minimum_access_length_buff[n]); -#endif - udvm_state_create(sha1buff, sha1_digest_buf, STATE_MIN_ACCESS_LEN); -/* end partial state-id change cco@iptel.org */ - proto_tree_add_text(udvm_tree,bytecode_tvb, 0, -1,"### Creating state ###"); - proto_tree_add_string(udvm_tree,hf_id, bytecode_tvb, 0, 0, bytes_to_str(wmem_packet_scope(), sha1_digest_buf, STATE_MIN_ACCESS_LEN)); - - n++; - - } - } - - - - /* At least something got decompressed, show it */ - decomp_tvb = tvb_new_child_real_data(message_tvb, out_buff,output_address,output_address); - /* Arrange that the allocated packet data copy be freed when the - * tvbuff is freed. - */ - tvb_set_free_cb( decomp_tvb, g_free ); - - add_new_data_source(pinfo, decomp_tvb, "Decompressed SigComp message"); - /* - proto_tree_add_text(udvm_tree, decomp_tvb, 0, -1,"SigComp message Decompressed"); - */ - used_udvm_cycles = used_udvm_cycles + state_length; - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"maximum_UDVM_cycles %u used_udvm_cycles %u", - maximum_UDVM_cycles, used_udvm_cycles); - return decomp_tvb; - break; - - default: - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1," ### Addr %u Invalid instruction: %u (0x%x)", - current_address,current_instruction,current_instruction); - break; - } - g_free(out_buff); - return NULL; -decompression_failure: - - proto_tree_add_text(udvm_tree, bytecode_tvb, 0, -1,"DECOMPRESSION FAILURE: %s", - val_to_str(result_code, result_code_vals,"Unknown (%u)")); - g_free(out_buff); - THROW(ReportedBoundsError); - return NULL; - -} - - /* The simplest operand type is the literal (#), which encodes a - * constant integer from 0 to 65535 inclusive. A literal operand may - * require between 1 and 3 bytes depending on its value. - * Bytecode: Operand value: Range: - * 0nnnnnnn N 0 - 127 - * 10nnnnnn nnnnnnnn N 0 - 16383 - * 11000000 nnnnnnnn nnnnnnnn N 0 - 65535 - * - * Figure 8: Bytecode for a literal (#) operand - * - */ -static int -decode_udvm_literal_operand(guint8 *buff,guint operand_address, guint16 *value) -{ - guint bytecode; - guint16 operand; - guint test_bits; - guint offset = operand_address; - guint8 temp_data; - - bytecode = buff[operand_address]; - test_bits = bytecode >> 7; - if (test_bits == 1){ - test_bits = bytecode >> 6; - if (test_bits == 2){ - /* - * 10nnnnnn nnnnnnnn N 0 - 16383 - */ - temp_data = buff[operand_address] & 0x1f; - operand = temp_data << 8; - temp_data = buff[(operand_address + 1) & 0xffff]; - operand = operand | temp_data; - *value = operand; - offset = offset + 2; - - }else{ - /* - * 111000000 nnnnnnnn nnnnnnnn N 0 - 65535 - */ - offset ++; - temp_data = buff[operand_address] & 0x1f; - operand = temp_data << 8; - temp_data = buff[(operand_address + 1) & 0xffff]; - operand = operand | temp_data; - *value = operand; - offset = offset + 2; - - } - }else{ - /* - * 0nnnnnnn N 0 - 127 - */ - operand = ( bytecode & 0x7f); - *value = operand; - offset ++; - } - - return offset; - -} - -/* - * The second operand type is the reference ($), which is always used to - * access a 2-byte value located elsewhere in the UDVM memory. The - * bytecode for a reference operand is decoded to be a constant integer - * from 0 to 65535 inclusive, which is interpreted as the memory address - * containing the actual value of the operand. - * Bytecode: Operand value: Range: - * - * 0nnnnnnn memory[2 * N] 0 - 65535 - * 10nnnnnn nnnnnnnn memory[2 * N] 0 - 65535 - * 11000000 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 - * - * Figure 9: Bytecode for a reference ($) operand - */ -static int -dissect_udvm_reference_operand(guint8 *buff,guint operand_address, guint16 *value,guint *result_dest) -{ - guint bytecode; - guint16 operand; - guint offset = operand_address; - guint test_bits; - guint8 temp_data; - guint16 temp_data16; - - bytecode = buff[operand_address]; - test_bits = bytecode >> 7; - if (test_bits == 1){ - test_bits = bytecode >> 6; - if (test_bits == 2){ - /* - * 10nnnnnn nnnnnnnn memory[2 * N] 0 - 65535 - */ - temp_data = buff[operand_address] & 0x3f; - operand = temp_data << 8; - temp_data = buff[(operand_address + 1) & 0xffff]; - operand = operand | temp_data; - operand = (operand * 2); - *result_dest = operand; - temp_data16 = buff[operand] << 8; - temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; - *value = temp_data16; - offset = offset + 2; - - }else{ - /* - * 11000000 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 - */ - operand_address++; - operand = buff[operand_address] << 8; - operand = operand | buff[(operand_address + 1) & 0xffff]; - *result_dest = operand; - temp_data16 = buff[operand] << 8; - temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; - *value = temp_data16; - offset = offset + 3; - - } - }else{ - /* - * 0nnnnnnn memory[2 * N] 0 - 65535 - */ - operand = ( bytecode & 0x7f); - operand = (operand * 2); - *result_dest = operand; - temp_data16 = buff[operand] << 8; - temp_data16 = temp_data16 | buff[(operand+1) & 0xffff]; - *value = temp_data16; - offset ++; - } - - if (offset >= UDVM_MEMORY_SIZE || *result_dest >= UDVM_MEMORY_SIZE - 1 ) - THROW(ReportedBoundsError); - - return offset; -} - - /* RFC3320 - * Figure 10: Bytecode for a multitype (%) operand - * Bytecode: Operand value: Range: HEX val - * 00nnnnnn N 0 - 63 0x00 - * 01nnnnnn memory[2 * N] 0 - 65535 0x40 - * 1000011n 2 ^ (N + 6) 64 , 128 0x86 - * 10001nnn 2 ^ (N + 8) 256 , ... , 32768 0x88 - * 111nnnnn N + 65504 65504 - 65535 0xe0 - * 1001nnnn nnnnnnnn N + 61440 61440 - 65535 0x90 - * 101nnnnn nnnnnnnn N 0 - 8191 0xa0 - * 110nnnnn nnnnnnnn memory[N] 0 - 65535 0xc0 - * 10000000 nnnnnnnn nnnnnnnn N 0 - 65535 0x80 - * 10000001 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 0x81 - */ -static int -decode_udvm_multitype_operand(guint8 *buff,guint operand_address, guint16 *value) -{ - guint test_bits; - guint bytecode; - guint offset = operand_address; - guint16 operand; - guint32 result; - guint8 temp_data; - guint16 temp_data16; - guint16 memmory_addr = 0; - -*value = 0; - - bytecode = buff[operand_address]; - test_bits = ( bytecode & 0xc0 ) >> 6; - switch (test_bits ){ - case 0: - /* - * 00nnnnnn N 0 - 63 - */ - operand = buff[operand_address]; - /* debug - *g_warning("Reading 0x%x From address %u",operand,offset); - */ - *value = operand; - offset ++; - break; - case 1: - /* - * 01nnnnnn memory[2 * N] 0 - 65535 - */ - memmory_addr = ( bytecode & 0x3f) * 2; - temp_data16 = buff[memmory_addr] << 8; - temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; - *value = temp_data16; - offset ++; - break; - case 2: - /* Check tree most significant bits */ - test_bits = ( bytecode & 0xe0 ) >> 5; - if ( test_bits == 5 ){ - /* - * 101nnnnn nnnnnnnn N 0 - 8191 - */ - temp_data = buff[operand_address] & 0x1f; - operand = temp_data << 8; - temp_data = buff[(operand_address + 1) & 0xffff]; - operand = operand | temp_data; - *value = operand; - offset = offset + 2; - }else{ - test_bits = ( bytecode & 0xf0 ) >> 4; - if ( test_bits == 9 ){ - /* - * 1001nnnn nnnnnnnn N + 61440 61440 - 65535 - */ - temp_data = buff[operand_address] & 0x0f; - operand = temp_data << 8; - temp_data = buff[(operand_address + 1) & 0xffff]; - operand = operand | temp_data; - operand = operand + 61440; - *value = operand; - offset = offset + 2; - }else{ - test_bits = ( bytecode & 0x08 ) >> 3; - if ( test_bits == 1){ - /* - * 10001nnn 2 ^ (N + 8) 256 , ... , 32768 - */ - - result = 1 << ((buff[operand_address] & 0x07) + 8); - operand = result & 0xffff; - *value = operand; - offset ++; - }else{ - test_bits = ( bytecode & 0x0e ) >> 1; - if ( test_bits == 3 ){ - /* - * 1000 011n 2 ^ (N + 6) 64 , 128 - */ - result = 1 << ((buff[operand_address] & 0x01) + 6); - operand = result & 0xffff; - *value = operand; - offset ++; - }else{ - /* - * 1000 0000 nnnnnnnn nnnnnnnn N 0 - 65535 - * 1000 0001 nnnnnnnn nnnnnnnn memory[N] 0 - 65535 - */ - offset ++; - temp_data16 = buff[(operand_address + 1) & 0xffff] << 8; - temp_data16 = temp_data16 | buff[(operand_address + 2) & 0xffff]; - /* debug - * g_warning("Reading 0x%x From address %u",temp_data16,operand_address); - */ - if ( (bytecode & 0x01) == 1 ){ - memmory_addr = temp_data16; - temp_data16 = buff[memmory_addr] << 8; - temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; - } - *value = temp_data16; - offset = offset +2; - } - - - } - } - } - break; - - case 3: - test_bits = ( bytecode & 0x20 ) >> 5; - if ( test_bits == 1 ){ - /* - * 111nnnnn N + 65504 65504 - 65535 - */ - operand = ( buff[operand_address] & 0x1f) + 65504; - *value = operand; - offset ++; - }else{ - /* - * 110nnnnn nnnnnnnn memory[N] 0 - 65535 - */ - memmory_addr = buff[operand_address] & 0x1f; - memmory_addr = memmory_addr << 8; - memmory_addr = memmory_addr | buff[(operand_address + 1) & 0xffff]; - temp_data16 = buff[memmory_addr] << 8; - temp_data16 = temp_data16 | buff[(memmory_addr+1) & 0xffff]; - *value = temp_data16; - /* debug - * g_warning("Reading 0x%x From address %u",temp_data16,memmory_addr); - */ - offset = offset +2; - } - - default : - break; - } - return offset; -} - /* - * - * The fourth operand type is the address (@). This operand is decoded - * as a multitype operand followed by a further step: the memory address - * of the UDVM instruction containing the address operand is added to - * obtain the correct operand value. So if the operand value from - * Figure 10 is D then the actual operand value of an address is - * calculated as follows: - * - * operand_value = (memory_address_of_instruction + D) modulo 2^16 - * - * Address operands are always used in instructions that control program - * flow, because they ensure that the UDVM bytecode is position- - * independent code (i.e., it will run independently of where it is - * placed in the UDVM memory). - */ -static int -decode_udvm_address_operand(guint8 *buff,guint operand_address, guint16 *value,guint current_address) -{ - guint32 result; - guint16 value1; - guint next_opreand_address; - - next_opreand_address = decode_udvm_multitype_operand(buff, operand_address, &value1); - result = value1 & 0xffff; - result = result + current_address; - *value = result & 0xffff; - return next_opreand_address; -} - - -/* - * This is a lookup table used to reverse the bits in a byte. - */ -static guint8 reverse [] = { - 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, - 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, - 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, - 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, - 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, - 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, - 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, - 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, - 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, - 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, - 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, - 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, - 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, - 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, - 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, - 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, - 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, - 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, - 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, - 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, - 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, - 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, - 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, - 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, - 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, - 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, - 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, - 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, - 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, - 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, - 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, - 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF -}; - - -static int -decomp_dispatch_get_bits( - tvbuff_t *message_tvb, - proto_tree *udvm_tree, - guint8 bit_order, - guint8 *buff, - guint16 *old_input_bit_order, - guint16 *remaining_bits, - guint16 *input_bits, - guint *input_address, - guint16 length, - guint16 *result_code, - guint msg_end) -{ - guint16 input_bit_order; - guint16 bits_still_required = length; - guint16 value = 0; - guint8 octet; - gint extra_bytes_available = msg_end - *input_address; - gint p_bit; - gint prev_p_bit = *old_input_bit_order & 0x0001; - gint bits_to_use = 0; - - - input_bit_order = buff[68] << 8; - input_bit_order = input_bit_order | buff[69]; - *result_code = 0; - p_bit = (input_bit_order & 0x0001) != 0; - - /* - * Discard any spare bits. - * Note: We take care to avoid remaining_bits having the value of 8. - */ - if (prev_p_bit != p_bit) - { - *remaining_bits = 0; - *old_input_bit_order = input_bit_order; - } - - /* - * Check we can suppy the required number of bits now, before we alter - * the input buffer's state. - */ - if (*remaining_bits + extra_bytes_available * 8 < length) - { - *result_code = 11; - return 0xfbad; - } - - /* Note: This is never called with length > 16, so the following loop - * never loops more than three time. */ - while (bits_still_required > 0) - { - /* - * We only put anything into input_bits if we know we will remove - * at least one bit. That ensures we can simply discard the spare - * bits if the P-bit changes. - */ - if (*remaining_bits == 0) - { - octet = tvb_get_guint8(message_tvb, *input_address); - if (print_level_1 ){ - proto_tree_add_text(udvm_tree, message_tvb, *input_address , 1, - " Getting value: %u (0x%x) From Addr: %u", octet, octet, *input_address); - } - *input_address = *input_address + 1; - - if (p_bit != 0) - { - octet = reverse[octet]; - } - *input_bits = octet; - *remaining_bits = 8; - } - - /* Add some more bits to the accumulated value. */ - bits_to_use = bits_still_required < *remaining_bits ? bits_still_required : *remaining_bits; - bits_still_required -= bits_to_use; - - *input_bits <<= bits_to_use; /* Shift bits into MSByte */ - value = (value << bits_to_use) /* Then add to the accumulated value */ - | ((*input_bits >> 8) & 0xFF); - *remaining_bits -= bits_to_use; - *input_bits &= 0x00FF; /* Leave just the remaining bits */ - } - - if (bit_order != 0) - { - /* Bit reverse the entire word. */ - guint16 lsb = reverse[(value >> 8) & 0xFF]; - guint16 msb = reverse[value & 0xFF]; - - value = ((msb << 8) | lsb) >> (16 - length); - } - - return value; -} - - -/* end udvm */ - -/* - * Editor modelines - http://www.wireshark.org/tools/modelines.html - * - * Local variables: - * c-basic-offset: 8 - * tab-width: 8 - * indent-tabs-mode: t - * End: - * - * vi: set shiftwidth=8 tabstop=8 noexpandtab: - * :indentSize=8:tabSize=8:noTabs=false: - */ diff --git a/epan/sigcomp-udvm.h b/epan/sigcomp-udvm.h deleted file mode 100644 index 870ee5bdcd..0000000000 --- a/epan/sigcomp-udvm.h +++ /dev/null @@ -1,47 +0,0 @@ -/* udvm.h - * Routines making up the Univerasl Decompressor Virtual Machine (UDVM) used for - * Signaling Compression (SigComp) dissection. - * Copyright 2004, Anders Broman <anders.broman@ericsson.com> - * - * Wireshark - Network traffic analyzer - * By Gerald Combs <gerald@wireshark.org> - * Copyright 1998 Gerald Combs - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * References: - * http://www.ietf.org/rfc/rfc3320.txt?number=3320 - * http://www.ietf.org/rfc/rfc3321.txt?number=3321 - * Useful links : - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-impl-guide-02.txt - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-sip-01.txt - */ - -#ifndef SIGCOMP_UDVM_H -#define SIGCOMP_UDVM_H - -#define UDVM_MEMORY_SIZE 65536 - -extern tvbuff_t* decompress_sigcomp_message(tvbuff_t *bytecode_tvb, tvbuff_t *message_tvb, packet_info *pinfo, - proto_tree *tree, gint destination, - gint print_flags, gint hf_id, gint header_len, - gint byte_code_state_len, gint byte_code_id_len, - gint udvm_start_ip); - - - -/* example: extern const value_string q931_cause_location_vals[]; */ -#endif -/* SIGCOMP_UDVM_H */ - diff --git a/epan/sigcomp_state_hdlr.c b/epan/sigcomp_state_hdlr.c deleted file mode 100644 index 575a36debe..0000000000 --- a/epan/sigcomp_state_hdlr.c +++ /dev/null @@ -1,884 +0,0 @@ -/* sigcomp_state_hdlr.c - * Routines making up the State handler of the Univerasl Decompressor Virtual Machine (UDVM) - * used for Signaling Compression (SigComp) dissection. - * Copyright 2004, Anders Broman <anders.broman@ericsson.com> - * - * Wireshark - Network traffic analyzer - * By Gerald Combs <gerald@wireshark.org> - * Copyright 1998 Gerald Combs - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * References: - * The Session Initiation Protocol (SIP) and Session Description Protocol - * (SDP) Static Dictionary for Signaling Compression (SigComp) - * http://www.ietf.org/rfc/rfc3485.txt?number=3485 - * - * http://www.ietf.org/rfc/rfc3320.txt?number=3320 - * http://www.ietf.org/rfc/rfc3321.txt?number=3321 - * Useful links : - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-impl-guide-03.txt - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-sip-01.txt - */ - -#include "config.h" - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <math.h> -#include <glib.h> -#include "to_str.h" - -#include "packet.h" -#include "sigcomp_state_hdlr.h" -#include "sigcomp-udvm.h" - -/* - * Defenitions for: - * The Session Initiation Protocol (SIP) and Session Description Protocol - * (SDP) Static Dictionary for Signaling Compression (SigComp) - * http://www.ietf.org/rfc/rfc3485.txt?number=3485 - */ -#define SIP_SDP_STATE_LENGTH 0x12e4 - -static const guint8 sip_sdp_state_identifier[STATE_BUFFER_SIZE] = -{ - /* -0000, */ 0xfb, 0xe5, 0x07, 0xdf, 0xe5, 0xe6, 0xaa, 0x5a, 0xf2, 0xab, 0xb9, 0x14, 0xce, 0xaa, 0x05, 0xf9, - /* -0010, */ 0x9c, 0xe6, 0x1b, 0xa5 -}; - -static const guint8 sip_sdp_static_dictionaty_for_sigcomp[0x12e4] = -{ - - /* -0000, */ 0x0d, 0x0a, 0x52, 0x65, 0x6a, 0x65, 0x63, 0x74, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x61, 0x63, 0x74, - /* -0010, */ 0x3a, 0x20, 0x0d, 0x0a, 0x45, 0x72, 0x72, 0x6f, 0x72, 0x2d, 0x49, 0x6e, 0x66, 0x6f, 0x3a, 0x20, - /* -0020, */ 0x0d, 0x0a, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x3a, 0x20, 0x0d, 0x0a, 0x43, - /* -0030, */ 0x61, 0x6c, 0x6c, 0x2d, 0x49, 0x6e, 0x66, 0x6f, 0x3a, 0x20, 0x0d, 0x0a, 0x52, 0x65, 0x70, 0x6c, - /* -0040, */ 0x79, 0x2d, 0x54, 0x6f, 0x3a, 0x20, 0x0d, 0x0a, 0x57, 0x61, 0x72, 0x6e, 0x69, 0x6e, 0x67, 0x3a, - /* -0050, */ 0x20, 0x0d, 0x0a, 0x53, 0x75, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x3a, 0x20, 0x3b, 0x68, 0x61, 0x6e, - /* -0060, */ 0x64, 0x6c, 0x69, 0x6e, 0x67, 0x3d, 0x69, 0x6d, 0x61, 0x67, 0x65, 0x3b, 0x70, 0x75, 0x72, 0x70, - /* -0070, */ 0x6f, 0x73, 0x65, 0x3d, 0x3b, 0x63, 0x61, 0x75, 0x73, 0x65, 0x3d, 0x3b, 0x74, 0x65, 0x78, 0x74, - /* -0080, */ 0x3d, 0x63, 0x61, 0x72, 0x64, 0x33, 0x30, 0x30, 0x20, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, - /* -0090, */ 0x65, 0x20, 0x43, 0x68, 0x6f, 0x69, 0x63, 0x65, 0x73, 0x6d, 0x69, 0x6d, 0x65, 0x73, 0x73, 0x61, - /* -00A0, */ 0x67, 0x65, 0x2f, 0x73, 0x69, 0x70, 0x66, 0x72, 0x61, 0x67, 0x34, 0x30, 0x37, 0x20, 0x50, 0x72, - /* -00B0, */ 0x6f, 0x78, 0x79, 0x20, 0x41, 0x75, 0x74, 0x68, 0x65, 0x6e, 0x74, 0x69, 0x63, 0x61, 0x74, 0x69, - /* -00C0, */ 0x6f, 0x6e, 0x20, 0x52, 0x65, 0x71, 0x75, 0x69, 0x72, 0x65, 0x64, 0x69, 0x67, 0x65, 0x73, 0x74, - /* -00D0, */ 0x2d, 0x69, 0x6e, 0x74, 0x65, 0x67, 0x72, 0x69, 0x74, 0x79, 0x34, 0x38, 0x34, 0x20, 0x41, 0x64, - 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/* -0EA0, */ 0x14, 0x0e, 0xb4, 0x0b, 0x0f, 0xa3, 0x0b, 0x07, 0x34, 0x0f, 0x0d, 0x56, 0x04, 0x0e, 0xf4, 0x03, - /* -0EB0, */ 0x10, 0xaf, 0x07, 0x0d, 0x34, 0x09, 0x0f, 0x27, 0x04, 0x10, 0x9b, 0x04, 0x10, 0x9f, 0x09, 0x10, - /* -0EC0, */ 0x59, 0x08, 0x10, 0x72, 0x09, 0x10, 0x35, 0x0a, 0x10, 0x21, 0x0a, 0x10, 0x17, 0x08, 0x0f, 0xe3, - /* -0ED0, */ 0x03, 0x10, 0xa9, 0x05, 0x0c, 0xac, 0x04, 0x0c, 0xbd, 0x07, 0x0c, 0xc1, 0x08, 0x0c, 0xc1, 0x09, - /* -0EE0, */ 0x0c, 0xf6, 0x10, 0x0c, 0x72, 0x0c, 0x0c, 0x86, 0x04, 0x0d, 0x64, 0x0c, 0x0c, 0xd5, 0x09, 0x0c, - /* -0EF0, */ 0xff, 0x1b, 0x0b, 0xfc, 0x11, 0x0c, 0x5d, 0x13, 0x0c, 0x30, 0x09, 0x0c, 0xa4, 0x0c, 0x0c, 0x24, - /* -0F00, */ 0x0c, 0x0d, 0x3b, 0x03, 0x0d, 0x1a, 0x03, 0x0d, 0x1d, 0x16, 0x0c, 0x43, 0x09, 0x0c, 0x92, 0x09, - /* -0F10, */ 0x0c, 0x9b, 0x0d, 0x0e, 0xcb, 0x04, 0x0d, 0x16, 0x06, 0x0d, 0x10, 0x05, 0x04, 0xf2, 0x0b, 0x0c, - /* -0F20, */ 0xe1, 0x05, 0x0b, 0xde, 0x0a, 0x0c, 0xec, 0x13, 0x0b, 0xe3, 0x07, 0x0b, 0xd4, 0x08, 0x0d, 0x08, - /* -0F30, */ 0x0c, 0x0c, 0xc9, 0x09, 0x0c, 0x3a, 0x04, 0x0a, 0xe5, 0x0c, 0x0a, 0x23, 0x08, 0x0b, 0x3a, 0x0e, - /* -0F40, */ 0x09, 0xab, 0x0f, 0x0e, 0xfa, 0x09, 0x0f, 0x6f, 0x0c, 0x0a, 0x17, 0x0f, 0x09, 0x76, 0x0c, 0x0a, - /* -0F50, */ 0x5f, 0x17, 0x0d, 0xe2, 0x0f, 0x07, 0xa8, 0x0a, 0x0f, 0x85, 0x0f, 0x08, 0xd6, 0x0e, 0x09, 0xb9, - /* -0F60, */ 0x0b, 0x0a, 0x7a, 0x03, 0x0b, 0xdb, 0x03, 0x08, 0xc1, 0x04, 0x0e, 0xc7, 0x03, 0x08, 0xd3, 0x02, - /* -0F70, */ 0x04, 0x8d, 0x08, 0x0b, 0x4a, 0x05, 0x0b, 0x8c, 0x07, 0x0b, 0x61, 0x06, 0x05, 0x48, 0x04, 0x07, - /* -0F80, */ 0xf4, 0x05, 0x10, 0x30, 0x04, 0x07, 0x1e, 0x08, 0x07, 0x1e, 0x05, 0x0b, 0x91, 0x10, 0x04, 0xca, - /* -0F90, */ 0x09, 0x0a, 0x71, 0x09, 0x0e, 0x87, 0x05, 0x04, 0x98, 0x05, 0x0b, 0x6e, 0x0b, 0x04, 0x9b, 0x0f, - /* -0FA0, */ 0x04, 0x9b, 0x07, 0x04, 0x9b, 0x03, 0x04, 0xa3, 0x07, 0x04, 0xa3, 0x10, 0x07, 0x98, 0x09, 0x07, - /* -0FB0, */ 0x98, 0x05, 0x0b, 0x73, 0x05, 0x0b, 0x78, 0x05, 0x0b, 0x7d, 0x05, 0x07, 0xb9, 0x05, 0x0b, 0x82, - /* -0FC0, */ 0x05, 0x0b, 0x87, 0x05, 0x0b, 0x1d, 0x05, 0x08, 0xe4, 0x05, 0x0c, 0x81, 0x05, 0x0f, 0x44, 0x05, - /* -0FD0, */ 0x11, 0x40, 0x05, 0x08, 0x78, 0x05, 0x08, 0x9d, 0x05, 0x0f, 0x58, 0x05, 0x07, 0x3f, 0x05, 0x0c, - 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/* -1120, */ 0x0c, 0xb1, 0x0e, 0x0c, 0x17, 0x11, 0x09, 0x4a, 0x0c, 0x0a, 0x53, 0x0c, 0x0a, 0x47, 0x09, 0x0a, - /* -1130, */ 0xf7, 0x0e, 0x09, 0xc7, 0x0c, 0x0a, 0x3b, 0x07, 0x06, 0x69, 0x08, 0x06, 0x69, 0x06, 0x09, 0xe3, - /* -1140, */ 0x08, 0x0b, 0x52, 0x0a, 0x0a, 0xd8, 0x12, 0x06, 0x57, 0x0d, 0x06, 0x57, 0x07, 0x09, 0xe3, 0x04, - /* -1150, */ 0x0a, 0xe9, 0x10, 0x07, 0x30, 0x09, 0x0b, 0x00, 0x0c, 0x0a, 0x2f, 0x05, 0x0a, 0xe9, 0x05, 0x0a, - /* -1160, */ 0x6b, 0x06, 0x0a, 0x6b, 0x0a, 0x0a, 0xce, 0x09, 0x0a, 0xee, 0x03, 0x0b, 0xdb, 0x07, 0x0f, 0x7e, - /* -1170, */ 0x0a, 0x09, 0x97, 0x0a, 0x06, 0x71, 0x0e, 0x09, 0xd5, 0x17, 0x06, 0x93, 0x07, 0x0e, 0x5c, 0x07, - /* -1180, */ 0x0f, 0xda, 0x0a, 0x0f, 0x35, 0x0d, 0x0d, 0xec, 0x0a, 0x09, 0x97, 0x0a, 0x06, 0x71, 0x08, 0x0b, - /* -1190, */ 0x22, 0x0f, 0x09, 0x85, 0x06, 0x0b, 0x68, 0x0c, 0x0d, 0x4a, 0x09, 0x0b, 0x09, 0x13, 0x08, 0xf8, - /* -11A0, */ 0x15, 0x08, 0xa2, 0x04, 0x0b, 0xaa, 0x0f, 0x05, 0x66, 0x0d, 0x07, 0x23, 0x09, 0x0a, 0x06, 0x0b, - /* -11B0, */ 0x0d, 0x4a, 0x0f, 0x04, 0xee, 0x06, 0x04, 0xf8, 0x04, 0x09, 0x2b, 0x04, 0x08, 0x53, 0x07, 0x08, - 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/* -1260, */ 0x08, 0x0b, 0xf4, 0x04, 0x07, 0xf8, 0x04, 0x07, 0x30, 0x04, 0x07, 0xbe, 0x04, 0x08, 0x57, 0x05, - /* -1270, */ 0x0d, 0x46, 0x04, 0x04, 0xfe, 0x04, 0x06, 0x0a, 0x04, 0x05, 0x4e, 0x04, 0x0e, 0x3b, 0x04, 0x08, - /* -1280, */ 0x0b, 0x04, 0x09, 0x30, 0x04, 0x08, 0xe9, 0x05, 0x05, 0xee, 0x04, 0x06, 0xc5, 0x04, 0x06, 0xf2, - /* -1290, */ 0x04, 0x06, 0x7b, 0x04, 0x09, 0xa1, 0x04, 0x05, 0xf1, 0x04, 0x08, 0x1e, 0x04, 0x07, 0x44, 0x04, - /* -12A0, */ 0x0b, 0xdd, 0x04, 0x0d, 0xfb, 0x04, 0x04, 0xaa, 0x04, 0x0b, 0xe3, 0x07, 0x0e, 0xee, 0x04, 0x0f, - /* -12B0, */ 0x09, 0x04, 0x0e, 0xb4, 0x04, 0x0d, 0xbe, 0x04, 0x10, 0xc5, 0x04, 0x08, 0x30, 0x05, 0x0f, 0x30, - /* -12C0, */ 0x04, 0x07, 0x59, 0x04, 0x0a, 0x0f, 0x06, 0x0e, 0x61, 0x04, 0x04, 0x81, 0x04, 0x0d, 0xab, 0x04, - /* -12D0, */ 0x0d, 0x93, 0x04, 0x11, 0x6b, 0x04, 0x0e, 0x96, 0x05, 0x04, 0x66, 0x09, 0x04, 0x6b, 0x0b, 0x04, - /* -12E0, */ 0x46, 0x04, 0x0c, 0xe1 - -}; - -/* - * Definitions for: - * The Presence-Specific Static Dictionary for Signaling - * http://www.ietf.org/rfc/rfc5112.txt?number=5112 - */ -#define PRESENCE_STATE_LENGTH 0x0d93 - -static const guint8 presence_state_identifier[STATE_BUFFER_SIZE] = -{ - /* -0000, */ 0xd9, 0x42, 0x29, 0x7d, 0x0b, 0xb3, 0x8f, 0xc0, 0x1d, 0x67, 0x41, 0xd6, 0xb3, 0xb4, 0x81, 0x57, - /* -0010, */ 0xac, 0x8e, 0x1b, 0xe0 -}; - -static const guint8 presence_static_dictionary_for_sigcomp[PRESENCE_STATE_LENGTH] = -{ - /* -0000, */ 0x63, 0x6f, 0x6e, 0x76, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2d, 0x63, 0x65, 0x6e, 0x74, 0x65, - /* -0010, */ 0x72, 0x6d, 0x69, 0x6e, 0x61, 0x74, 0x65, 0x64, 0x65, 0x70, 0x72, 0x65, 0x73, 0x73, 0x65, 0x64, - /* -0020, */ 0x69, 0x73, 0x67, 0x75, 0x73, 0x74, 0x65, 0x64, 0x69, 0x6e, 0x64, 0x75, 0x73, 0x74, 0x72, 0x69, - /* -0030, */ 0x61, 0x6c, 0x61, 0x73, 0x74, 0x2d, 0x69, 0x6e, 0x70, 0x75, 0x74, 0x3d, 0x68, 0x75, 0x6d, 0x69, - /* -0040, */ 0x6c, 0x69, 0x61, 0x74, 0x65, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x3d, 0x61, 0x75, 0x74, 0x6f, - /* -0050, */ 0x6d, 0x6f, 0x62, 0x69, 0x6c, 0x65, 0x63, 0x75, 0x72, 0x69, 0x6f, 0x75, 0x73, 0x70, 0x69, 0x72, - 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/* -09C0, */ 0xb2, 0x1d, 0x09, 0x56, 0x0d, 0x0c, 0x38, 0x06, 0x07, 0xba, 0x0b, 0x08, 0xb9, 0x0b, 0x07, 0xec, - /* -09D0, */ 0x06, 0x0d, 0x02, 0x0a, 0x0a, 0x46, 0x04, 0x08, 0xf4, 0x06, 0x0b, 0x6a, 0x04, 0x0a, 0xb6, 0x0c, - /* -09E0, */ 0x0c, 0x55, 0x08, 0x0a, 0x31, 0x04, 0x0a, 0x92, 0x08, 0x0a, 0x1b, 0x05, 0x0a, 0xb1, 0x04, 0x08, - /* -09F0, */ 0xc0, 0x05, 0x0a, 0x27, 0x05, 0x0a, 0xa7, 0x05, 0x0a, 0xac, 0x04, 0x0a, 0xba, 0x04, 0x07, 0xdc, - /* -0A00, */ 0x05, 0x08, 0xad, 0x0a, 0x09, 0x29, 0x0a, 0x08, 0xa7, 0x05, 0x0a, 0x56, 0x05, 0x0b, 0x4d, 0x07, - /* -0A10, */ 0x09, 0x2a, 0x0d, 0x09, 0xa7, 0x0b, 0x07, 0xa9, 0x06, 0x09, 0xc6, 0x0b, 0x0b, 0x5f, 0x0c, 0x09, - /* -0A20, */ 0xdf, 0x0b, 0x09, 0xe0, 0x06, 0x07, 0xcb, 0x0c, 0x0a, 0x0b, 0x09, 0x09, 0x20, 0x08, 0x0a, 0x97, - /* -0A30, */ 0x07, 0x09, 0xe0, 0x07, 0x0c, 0xfb, 0x06, 0x0a, 0x8c, 0x0e, 0x09, 0x7f, 0x0a, 0x09, 0x87, 0x0b, - /* -0A40, */ 0x0c, 0x71, 0x0a, 0x0c, 0x71, 0x06, 0x07, 0x93, 0x05, 0x0a, 0x66, 0x04, 0x08, 0x67, 0x04, 0x09, - /* -0A50, */ 0xba, 0x08, 0x09, 0x20, 0x0a, 0x0b, 0x72, 0x05, 0x0a, 0x72, 0x08, 0x07, 0xb3, 0x0b, 0x0a, 0xc5, - /* -0A60, */ 0x07, 0x09, 0xf2, 0x07, 0x08, 0x89, 0x04, 0x08, 0xad, 0x08, 0x0a, 0xbe, 0x06, 0x0c, 0x9f, 0x0b, - /* -0A70, */ 0x06, 0xd0, 0x0e, 0x08, 0x26, 0x08, 0x0a, 0x9f, 0x07, 0x09, 0xc6, 0x0a, 0x0c, 0x69, 0x07, 0x08, - /* -0A80, */ 0x85, 0x05, 0x0b, 0x7c, 0x07, 0x0a, 0x39, 0x0c, 0x09, 0x34, 0x07, 0x0a, 0x21, 0x09, 0x08, 0x7d, - /* -0A90, */ 0x07, 0x0c, 0xf5, 0x0b, 0x0c, 0xa3, 0x14, 0x06, 0xa6, 0x0d, 0x08, 0xb2, 0x0c, 0x07, 0x2a, 0x0c, - /* -0AA0, */ 0x08, 0xb3, 0x04, 0x07, 0x56, 0x07, 0x09, 0x1a, 0x04, 0x07, 0x52, 0x07, 0x07, 0x40, 0x05, 0x07, - /* -0AB0, */ 0x4d, 0x07, 0x0b, 0x80, 0x06, 0x07, 0x47, 0x16, 0x06, 0x91, 0x08, 0x0c, 0x62, 0x10, 0x09, 0xcf, - /* -0AC0, */ 0x10, 0x07, 0xdd, 0x09, 0x0a, 0xf6, 0x09, 0x06, 0xfc, 0x0c, 0x0b, 0x17, 0x07, 0x07, 0x39, 0x04, - /* -0AD0, */ 0x06, 0xf8, 0x07, 0x09, 0xa1, 0x06, 0x06, 0x8d, 0x05, 0x07, 0x21, 0x04, 0x0a, 0x55, 0x09, 0x0a, - /* -0AE0, */ 0xd2, 0x0c, 0x0a, 0xcf, 0x13, 0x06, 0xc8, 0x0a, 0x08, 0xec, 0x07, 0x0d, 0x06, 0x0b, 0x08, 0x0c, - /* -0AF0, */ 0x14, 0x0b, 0xd5, 0x12, 0x07, 0xbe, 0x0d, 0x07, 0xd1, 0x16, 0x08, 0x01, 0x14, 0x0b, 0xf1, 0x06, - /* -0B00, */ 0x05, 0xb4, 0x07, 0x04, 0x56, 0x09, 0x04, 0x17, 0x0c, 0x0a, 0xea, 0x09, 0x04, 0x1f, 0x0a, 0x07, - /* -0B10, */ 0x7e, 0x0b, 0x07, 0x6a, 0x07, 0x0c, 0x0f, 0x0b, 0x07, 0xa0, 0x0a, 0x0c, 0x96, 0x06, 0x05, 0x28, - /* -0B20, */ 0x06, 0x0a, 0x7d, 0x05, 0x06, 0x1f, 0x07, 0x05, 0x8b, 0x0a, 0x04, 0x3c, 0x06, 0x05, 0xae, 0x04, - /* -0B30, */ 0x06, 0x50, 0x09, 0x0a, 0xe2, 0x06, 0x05, 0xf6, 0x07, 0x07, 0xfd, 0x09, 0x0b, 0x33, 0x0a, 0x0c, - /* -0B40, */ 0xec, 0x0a, 0x0a, 0x83, 0x07, 0x06, 0x54, 0x06, 0x04, 0x90, 0x04, 0x05, 0x3f, 0x05, 0x0a, 0x92, - /* -0B50, */ 0x07, 0x07, 0x8a, 0x07, 0x08, 0xcc, 0x08, 0x09, 0xea, 0x07, 0x04, 0x96, 0x05, 0x06, 0x10, 0x08, - /* -0B60, */ 0x07, 0x98, 0x0a, 0x06, 0xf1, 0x08, 0x04, 0x79, 0x09, 0x0b, 0x22, 0x07, 0x0b, 0x8e, 0x07, 0x0b, - /* -0B70, */ 0x46, 0x04, 0x0d, 0x3c, 0x06, 0x04, 0x80, 0x08, 0x07, 0x12, 0x09, 0x09, 0x4a, 0x07, 0x04, 0xe3, - /* -0B80, */ 0x07, 0x05, 0x84, 0x05, 0x09, 0x7a, 0x05, 0x06, 0x01, 0x09, 0x09, 0x12, 0x04, 0x09, 0x52, 0x0d, - /* -0B90, */ 0x04, 0xaa, 0x0d, 0x08, 0x56, 0x08, 0x04, 0xdc, 0x07, 0x05, 0x92, 0x05, 0x05, 0x0c, 0x0a, 0x04, - /* -0BA0, */ 0x4c, 0x04, 0x06, 0x2c, 0x0b, 0x04, 0xd1, 0x04, 0x06, 0x24, 0x09, 0x0c, 0x40, 0x04, 0x04, 0xce, - /* -0BB0, */ 0x0c, 0x08, 0xc1, 0x11, 0x04, 0x00, 0x05, 0x07, 0x34, 0x0a, 0x06, 0x6a, 0x08, 0x0d, 0x28, 0x05, - /* -0BC0, */ 0x06, 0x1a, 0x0a, 0x04, 0x28, 0x07, 0x0a, 0xfe, 0x06, 0x04, 0xff, 0x08, 0x09, 0x94, 0x07, 0x05, - /* -0BD0, */ 0x76, 0x10, 0x08, 0x98, 0x06, 0x05, 0xf0, 0x06, 0x09, 0x03, 0x10, 0x09, 0x03, 0x09, 0x08, 0x1e, - /* -0BE0, */ 0x0a, 0x08, 0x3c, 0x06, 0x09, 0x9b, 0x0d, 0x0c, 0xbb, 0x07, 0x06, 0xe3, 0x05, 0x09, 0xcc, 0x06, - /* -0BF0, */ 0x0a, 0x15, 0x07, 0x04, 0x73, 0x05, 0x06, 0x73, 0x0d, 0x06, 0x73, 0x05, 0x08, 0x45, 0x08, 0x0a, - /* -0C00, */ 0x29, 0x09, 0x0a, 0x40, 0x05, 0x07, 0x1a, 0x0a, 0x07, 0x1a, 0x09, 0x0b, 0x4f, 0x09, 0x0c, 0xdb, - /* -0C10, */ 0x06, 0x05, 0xea, 0x06, 0x05, 0xde, 0x0a, 0x04, 0x0e, 0x0a, 0x0b, 0x0e, 0x09, 0x06, 0x86, 0x08, - /* -0C20, */ 0x05, 0x60, 0x0b, 0x07, 0x74, 0x09, 0x05, 0x4f, 0x08, 0x04, 0xf0, 0x07, 0x09, 0x90, 0x06, 0x08, - /* -0C30, */ 0x70, 0x0a, 0x0c, 0x21, 0x07, 0x05, 0x6f, 0x0b, 0x0c, 0xcc, 0x04, 0x07, 0x90, 0x07, 0x04, 0xea, - /* -0C40, */ 0x0a, 0x08, 0x33, 0x04, 0x06, 0x34, 0x09, 0x06, 0xdc, 0x04, 0x06, 0x40, 0x07, 0x05, 0x2e, 0x04, - /* -0C50, */ 0x06, 0x48, 0x06, 0x07, 0x87, 0x07, 0x05, 0x68, 0x0a, 0x0d, 0x1a, 0x07, 0x04, 0x45, 0x07, 0x05, - /* -0C60, */ 0x05, 0x08, 0x05, 0x0e, 0x08, 0x05, 0x58, 0x08, 0x04, 0xb6, 0x10, 0x09, 0xf8, 0x04, 0x06, 0x3c, - /* -0C70, */ 0x07, 0x09, 0xbc, 0x0c, 0x06, 0xd0, 0x0c, 0x0b, 0xe7, 0x04, 0x06, 0x44, 0x04, 0x0a, 0x31, 0x0b, - /* -0C80, */ 0x0c, 0x05, 0x04, 0x06, 0x28, 0x11, 0x07, 0x5a, 0x07, 0x0c, 0xc5, 0x07, 0x05, 0xa0, 0x0c, 0x09, - /* -0C90, */ 0x6f, 0x08, 0x0c, 0xbb, 0x08, 0x0a, 0x76, 0x09, 0x08, 0x16, 0x08, 0x08, 0x69, 0x06, 0x05, 0xe4, - /* -0CA0, */ 0x09, 0x04, 0x86, 0x07, 0x05, 0x38, 0x06, 0x0a, 0x4f, 0x08, 0x04, 0xc6, 0x0f, 0x08, 0xf4, 0x0b, - /* -0CB0, */ 0x04, 0x31, 0x07, 0x0a, 0x04, 0x07, 0x08, 0xa1, 0x0d, 0x0c, 0x55, 0x06, 0x05, 0xc0, 0x06, 0x05, - /* -0CC0, */ 0xba, 0x05, 0x05, 0x41, 0x08, 0x0b, 0x87, 0x08, 0x04, 0x89, 0x04, 0x05, 0x35, 0x0c, 0x0a, 0x5a, - /* -0CD0, */ 0x09, 0x04, 0x68, 0x09, 0x04, 0x9c, 0x0a, 0x06, 0xba, 0x06, 0x07, 0x0d, 0x05, 0x07, 0x25, 0x09, - /* -0CE0, */ 0x0b, 0x9d, 0x09, 0x0a, 0x69, 0x06, 0x0a, 0x6c, 0x04, 0x06, 0x38, 0x04, 0x06, 0x30, 0x07, 0x0d, - /* -0CF0, */ 0x13, 0x08, 0x08, 0x4c, 0x05, 0x06, 0x15, 0x06, 0x04, 0x50, 0x0a, 0x07, 0x04, 0x06, 0x07, 0xf7, - /* -0D00, */ 0x04, 0x08, 0x49, 0x0f, 0x08, 0x89, 0x0c, 0x09, 0x3f, 0x05, 0x06, 0x81, 0x11, 0x08, 0xdc, 0x0d, - /* -0D10, */ 0x04, 0x5c, 0x11, 0x06, 0x5a, 0x05, 0x0d, 0x0e, 0x06, 0x05, 0xd8, 0x04, 0x08, 0xd3, 0x06, 0x05, - /* -0D20, */ 0xd2, 0x07, 0x05, 0x7d, 0x06, 0x05, 0xcc, 0x07, 0x08, 0xd6, 0x05, 0x06, 0x0b, 0x07, 0x05, 0xa7, - /* -0D30, */ 0x05, 0x05, 0x16, 0x08, 0x05, 0x1a, 0x09, 0x05, 0x46, 0x06, 0x05, 0xc6, 0x06, 0x09, 0x31, 0x0d, - /* -0D40, */ 0x0b, 0xcf, 0x09, 0x08, 0x62, 0x08, 0x04, 0xf8, 0x04, 0x08, 0x54, 0x0a, 0x06, 0x7f, 0x04, 0x04, - /* -0D50, */ 0x71, 0x0c, 0x0c, 0x16, 0x04, 0x05, 0x2e, 0x08, 0x0b, 0x3f, 0x11, 0x0c, 0x23, 0x08, 0x0c, 0x7b, - /* -0D60, */ 0x09, 0x0b, 0xc7, 0x07, 0x07, 0xf6, 0x05, 0x0b, 0x3b, 0x09, 0x08, 0x75, 0x09, 0x0c, 0x81, 0x09, - /* -0D70, */ 0x06, 0xe9, 0x0b, 0x09, 0xb0, 0x07, 0x05, 0x22, 0x07, 0x04, 0xa3, 0x07, 0x06, 0xc2, 0x07, 0x05, - /* -0D80, */ 0x99, 0x05, 0x06, 0x06, 0x05, 0x05, 0xfc, 0x04, 0x09, 0xc3, 0x04, 0x06, 0x4c, 0x08, 0x04, 0xbe, - /* -0D90, */ 0x09, 0x0b, 0x2a -}; - -static GHashTable *state_buffer_table=NULL; - - -void -sigcomp_init_udvm(void){ - - gchar *partial_state_str; - guint8 *sip_sdp_buff, *presence_buff; - - /* Destroy any existing memory chunks / hashes. */ - if (state_buffer_table){ - g_hash_table_destroy(state_buffer_table); - } - - - state_buffer_table = g_hash_table_new_full(g_str_hash, - g_str_equal, - g_free, /* key_destroy_func */ - g_free); /* value_destroy_func */ - /* - * Store static dictionaries in hash table - */ - sip_sdp_buff = (guint8 *)g_malloc(SIP_SDP_STATE_LENGTH + 8); - - partial_state_str = bytes_to_str(NULL, sip_sdp_state_identifier, 6); - - /* - * Debug g_warning("Sigcomp init: Storing partial state =%s",partial_state_str); - */ - memset(sip_sdp_buff, 0, 8); - sip_sdp_buff[0] = SIP_SDP_STATE_LENGTH >> 8; - sip_sdp_buff[1] = SIP_SDP_STATE_LENGTH & 0xff; - memcpy(sip_sdp_buff+8, sip_sdp_static_dictionaty_for_sigcomp, SIP_SDP_STATE_LENGTH); - - g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), sip_sdp_buff); - wmem_free(NULL, partial_state_str); - /* Debug - * g_warning("g_hash_table_insert = 0x%x",sip_sdp_buff); - * g_warning("g_hash_table_insert = 0x%x",sip_sdp_buff); - */ - - presence_buff = (guint8 *)g_malloc(PRESENCE_STATE_LENGTH + 8); - - partial_state_str = bytes_to_str(NULL, presence_state_identifier, 6); - - memset(presence_buff, 0, 8); - presence_buff[0] = PRESENCE_STATE_LENGTH >> 8; - presence_buff[1] = PRESENCE_STATE_LENGTH & 0xff; - memcpy(presence_buff+8, presence_static_dictionary_for_sigcomp, PRESENCE_STATE_LENGTH); - - g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), presence_buff); - wmem_free(NULL, partial_state_str); -} - - -int udvm_state_access(tvbuff_t *tvb, proto_tree *tree,guint8 *buff,guint16 p_id_start, guint16 p_id_length, guint16 state_begin, guint16 *state_length, - guint16 *state_address, guint16 *state_instruction, - gint hf_id) -{ - int result_code = 0; - guint32 n; - guint16 k; - guint16 buf_size_real; - guint16 byte_copy_right; - guint16 byte_copy_left; - char partial_state[STATE_BUFFER_SIZE]; /* Size is 6 - 20 */ - guint8 *state_buff; - gchar *partial_state_str; - - /* - * Perform initial checks on validity of data - * RFC 3320 : - * 9.4.5. STATE-ACCESS - * : - * Decompression failure occurs if partial_identifier_length does not - * lie between 6 and 20 inclusive. Decompression failure also occurs if - * no state item matching the partial state identifier can be found, if - * more than one state item matches the partial identifier, or if - * partial_identifier_length is less than the minimum_access_length of - * the matched state item. Otherwise, a state item is returned from the - * state handler. - */ - - if (( p_id_length < STATE_MIN_ACCESS_LEN ) || ( p_id_length > STATE_BUFFER_SIZE )){ - result_code = 1; - return result_code; - } - - n = 0; - while ( n < p_id_length && n < STATE_BUFFER_SIZE && p_id_start + n < UDVM_MEMORY_SIZE ){ - partial_state[n] = buff[p_id_start + n]; - n++; - } - partial_state_str = bytes_to_str(wmem_packet_scope(), partial_state, p_id_length); - proto_tree_add_text(tree,tvb, 0, -1,"### Accessing state ###"); - proto_tree_add_string(tree,hf_id, tvb, 0, 0, partial_state_str); - - /* Debug - * g_warning("State Access: partial state =%s",partial_state_str); - * g_warning("g_hash_table_lookup = 0x%x",state_buff); - * g_warning("State Access: partial state =%s",partial_state_str); - */ - state_buff = (guint8 *)g_hash_table_lookup(state_buffer_table, partial_state_str); - if ( state_buff == NULL ){ - result_code = 2; /* No state match */ - return result_code; - } - /* - * sip_sdp_static_dictionaty - * - * 8.4. Byte copying - * : - * The string of bytes is copied in ascending order of memory address, - * respecting the bounds set by byte_copy_left and byte_copy_right. - * More precisely, if a byte is copied from/to Address m then the next - * byte is copied from/to Address n where n is calculated as follows: - * - * Set k := m + 1 (modulo 2^16) - * If k = byte_copy_right then set n := byte_copy_left, else set n := k - * - */ - - /* - * buff = Where "state" will be stored - * p_id_start = Partial state identifier start pos in the buffer(buff) - * p-id_length = Partial state identifier length - * state_begin = Where to start to read state from - * state_length = Length of state - * state_address = Address where to store the state in the buffer(buff) - * state_instruction = - * FALSE = Indicates that state_* is in the stored state - */ - - buf_size_real = (state_buff[0] << 8) | state_buff[1]; - - /* - * The value of - * state_length MUST be taken from the returned item of state in the - * case that the state_length operand is set to 0. - * - * The same is true of state_address, state_instruction. - */ - if (*state_length == 0) { - *state_length = buf_size_real; - } - if ( *state_address == 0 ){ - *state_address = state_buff[2] << 8; - *state_address = *state_address | state_buff[3]; - } - if ( *state_instruction == 0 ){ - *state_instruction = state_buff[4] << 8; - *state_instruction = *state_instruction | state_buff[5]; - } - - /* - * Decompression failure occurs if bytes are copied from beyond the end of - * the state_value. - */ - if ((state_begin + *state_length) > buf_size_real) { - return 3; - } - - /* - * Note that decompression failure will always occur if the state_length - * operand is set to 0 but the state_begin operand is non-zero. - */ - if (*state_length == 0 && state_begin != 0) { - return 17; - } - - n = state_begin + 8; - k = *state_address; - - /* - * NOTE: Strictly speaking, byte_copy_left and byte_copy_right should - * not be used if this has been called for bytecode referenced in - * the message header. However, since the memory is initialised - * to zero, the code works OK. - */ - byte_copy_right = buff[66] << 8; - byte_copy_right = byte_copy_right | buff[67]; - byte_copy_left = buff[64] << 8; - byte_copy_left = byte_copy_left | buff[65]; - /* debug - *g_warning(" state_begin %u state_address %u",state_begin , *state_address); - */ - while ( (gint32) n < (state_begin + *state_length + 8) && n < UDVM_MEMORY_SIZE ){ - buff[k] = state_buff[n]; - /* debug - g_warning(" Loading 0x%x at address %u",buff[k] , k); - */ - k = ( k + 1 ) & 0xffff; - if ( k == byte_copy_right ){ - k = byte_copy_left; - } - n++; - } - return 0; - /* - * End SIP - */ - -} - -void udvm_state_create(guint8 *state_buff,guint8 *state_identifier,guint16 p_id_length){ - - char partial_state[STATE_BUFFER_SIZE]; - guint i; - gchar *partial_state_str; - gchar *dummy_buff; - /* - * Debug - g_warning("Received items of state,state_length_buff[0]= %u, state_length_buff[1]= %u", - state_length_buff[0],state_length_buff[1]); - - */ - i = 0; - while ( i < p_id_length && i < STATE_BUFFER_SIZE ){ - partial_state[i] = state_identifier[i]; - i++; - } - partial_state_str = bytes_to_str(NULL, partial_state, p_id_length); - - dummy_buff = (gchar *)g_hash_table_lookup(state_buffer_table, partial_state_str); - if ( dummy_buff == NULL ){ - g_hash_table_insert(state_buffer_table, g_strdup(partial_state_str), state_buff); - }else{ - /* The buffer allocated by sigcomp-udvm.c wasen't needed so free it - */ - g_free(state_buff); - - } - wmem_free(NULL, partial_state_str); -} - -#if 1 -void udvm_state_free(guint8 buff[] _U_,guint16 p_id_start _U_,guint16 p_id_length _U_){ -} -#else -void udvm_state_free(guint8 buff[],guint16 p_id_start,guint16 p_id_length){ - char partial_state[STATE_BUFFER_SIZE]; - guint i; - gchar *partial_state_str; - - gchar *dummy_buff; - - i = 0; - while ( i < p_id_length && i < STATE_BUFFER_SIZE && p_id_start + i < UDVM_MEMORY_SIZE ){ - partial_state[i] = buff[p_id_start + i]; - i++; - } - partial_state_str = bytes_to_str(NULL, partial_state, p_id_length); - /* TODO Implement a state create counter before actually freeing states - * Hmm is it a good idea to free the buffer at all? - */ - g_warning("State-free on %s ",partial_state_str); - dummy_buff = g_hash_table_lookup(state_buffer_table, partial_state_str); - if ( dummy_buff == NULL ){ - g_warning("State-free, state not found %s",partial_state_str); - }else{ - g_hash_table_remove (state_buffer_table, partial_state_str); - g_free(dummy_buff); - } - wmem_free(NULL, partial_state_str); -} -#endif - -/* - * Editor modelines - http://www.wireshark.org/tools/modelines.html - * - * Local variables: - * c-basic-offset: 8 - * tab-width: 8 - * indent-tabs-mode: t - * End: - * - * vi: set shiftwidth=8 tabstop=8 noexpandtab: - * :indentSize=8:tabSize=8:noTabs=false: - */ diff --git a/epan/sigcomp_state_hdlr.h b/epan/sigcomp_state_hdlr.h deleted file mode 100644 index 5c97ef5941..0000000000 --- a/epan/sigcomp_state_hdlr.h +++ /dev/null @@ -1,47 +0,0 @@ -/* sigcomp_state_hdlr.c - * Routines making up the State handler of the Univerasl Decompressor Virtual Machine (UDVM) - * used for Signaling Compression (SigComp) dissection. - * Copyright 2004, Anders Broman <anders.broman@ericsson.com> - * - * Wireshark - Network traffic analyzer - * By Gerald Combs <gerald@wireshark.org> - * Copyright 1998 Gerald Combs - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * References: - * http://www.ietf.org/rfc/rfc3320.txt?number=3320 - * http://www.ietf.org/rfc/rfc3321.txt?number=3321 - * Useful links : - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-impl-guide-03.txt - * http://www.ietf.org/internet-drafts/draft-ietf-rohc-sigcomp-sip-01.txt - */ - -#ifndef SIGCOMP_STATE_HDLR_H -#define SIGCOMP_STATE_HDLR_H - -extern const value_string result_code_vals[]; -extern int udvm_state_access(tvbuff_t *tvb, proto_tree *tree,guint8 *buff,guint16 p_id_start, guint16 p_id_length, guint16 state_begin, guint16 *state_length, - guint16 *state_address, guint16 *state_instruction, gint hf_id); - -extern void udvm_state_create(guint8 *state_buff,guint8 *state_identifier_buff,guint16 p_id_length); -extern void udvm_state_free(guint8 buff[],guint16 p_id_start,guint16 p_id_length); - -extern void sigcomp_init_udvm(void); - -#define STATE_BUFFER_SIZE 20 -#define STATE_MIN_ACCESS_LEN 6 - -#endif -/* SIGCOMP_STATE_HDLR_H */ |