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-rw-r--r--src/gxvalid/gxvmort2.c282
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diff --git a/src/gxvalid/gxvmort2.c b/src/gxvalid/gxvmort2.c
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+/***************************************************************************/
+/* */
+/* gxvmort2.c */
+/* */
+/* TrueTypeGX/AAT mort table validation */
+/* body for type2 (Ligature Substitution) subtable. */
+/* */
+/* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+/***************************************************************************/
+/* */
+/* gxvalid is derived from both gxlayout module and otvalid module. */
+/* Development of gxlayout is supported by the Information-technology */
+/* Promotion Agency(IPA), Japan. */
+/* */
+/***************************************************************************/
+
+
+#include "gxvmort.h"
+
+
+ /*************************************************************************/
+ /* */
+ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
+ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
+ /* messages during execution. */
+ /* */
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_gxvmort
+
+
+ typedef struct GXV_mort_subtable_type2_StateOptRec_
+ {
+ FT_UShort ligActionTable;
+ FT_UShort componentTable;
+ FT_UShort ligatureTable;
+ FT_UShort ligActionTable_length;
+ FT_UShort componentTable_length;
+ FT_UShort ligatureTable_length;
+
+ } GXV_mort_subtable_type2_StateOptRec,
+ *GXV_mort_subtable_type2_StateOptRecData;
+
+#define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \
+ ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 )
+
+
+ static void
+ gxv_mort_subtable_type2_opttable_load( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+ GXV_mort_subtable_type2_StateOptRecData optdata =
+ (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
+
+
+ GXV_LIMIT_CHECK( 2 + 2 + 2 );
+ optdata->ligActionTable = FT_NEXT_USHORT( p );
+ optdata->componentTable = FT_NEXT_USHORT( p );
+ optdata->ligatureTable = FT_NEXT_USHORT( p );
+
+ GXV_TRACE(( "offset to ligActionTable=0x%04x\n",
+ optdata->ligActionTable ));
+ GXV_TRACE(( "offset to componentTable=0x%04x\n",
+ optdata->componentTable ));
+ GXV_TRACE(( "offset to ligatureTable=0x%04x\n",
+ optdata->ligatureTable ));
+ }
+
+
+ static void
+ gxv_mort_subtable_type2_subtable_setup( FT_UShort table_size,
+ FT_UShort classTable,
+ FT_UShort stateArray,
+ FT_UShort entryTable,
+ FT_UShort *classTable_length_p,
+ FT_UShort *stateArray_length_p,
+ FT_UShort *entryTable_length_p,
+ GXV_Validator valid )
+ {
+ FT_UShort o[6];
+ FT_UShort *l[6];
+ FT_UShort buff[7];
+
+ GXV_mort_subtable_type2_StateOptRecData optdata =
+ (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
+
+
+ GXV_NAME_ENTER( "subtable boundaries setup" );
+
+ o[0] = classTable;
+ o[1] = stateArray;
+ o[2] = entryTable;
+ o[3] = optdata->ligActionTable;
+ o[4] = optdata->componentTable;
+ o[5] = optdata->ligatureTable;
+ l[0] = classTable_length_p;
+ l[1] = stateArray_length_p;
+ l[2] = entryTable_length_p;
+ l[3] = &(optdata->ligActionTable_length);
+ l[4] = &(optdata->componentTable_length);
+ l[5] = &(optdata->ligatureTable_length);
+
+ gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, valid );
+
+ GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n",
+ classTable, *classTable_length_p ));
+ GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n",
+ stateArray, *stateArray_length_p ));
+ GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n",
+ entryTable, *entryTable_length_p ));
+ GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n",
+ optdata->ligActionTable,
+ optdata->ligActionTable_length ));
+ GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n",
+ optdata->componentTable,
+ optdata->componentTable_length ));
+ GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n",
+ optdata->ligatureTable,
+ optdata->ligatureTable_length ));
+
+ GXV_EXIT;
+ }
+
+
+ static void
+ gxv_mort_subtable_type2_ligActionOffset_validate(
+ FT_Bytes table,
+ FT_UShort ligActionOffset,
+ GXV_Validator valid )
+ {
+ /* access ligActionTable */
+ GXV_mort_subtable_type2_StateOptRecData optdata =
+ (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
+
+ FT_Bytes lat_base = table + optdata->ligActionTable;
+ FT_Bytes p = table + ligActionOffset;
+ FT_Bytes lat_limit = lat_base + optdata->ligActionTable;
+
+
+ GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset );
+ if ( p < lat_base )
+ {
+ GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n",
+ ligActionOffset, lat_base - p ));
+
+ /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
+ if ( valid->root->level >= FT_VALIDATE_PARANOID )
+ FT_INVALID_OFFSET;
+ }
+ else if ( lat_limit < p )
+ {
+ GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n",
+ ligActionOffset, p - lat_limit ));
+
+ /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */
+ if ( valid->root->level >= FT_VALIDATE_PARANOID )
+ FT_INVALID_OFFSET;
+ }
+ else
+ {
+ /* validate entry in ligActionTable */
+ FT_ULong lig_action;
+ FT_UShort last;
+ FT_UShort store;
+ FT_ULong offset;
+
+
+ lig_action = FT_NEXT_ULONG( p );
+ last = (FT_UShort)( ( lig_action >> 31 ) & 1 );
+ store = (FT_UShort)( ( lig_action >> 30 ) & 1 );
+
+ offset = lig_action & 0x3FFFFFFFUL;
+ }
+ }
+
+
+ static void
+ gxv_mort_subtable_type2_entry_validate(
+ FT_Byte state,
+ FT_UShort flags,
+ GXV_StateTable_GlyphOffsetDesc glyphOffset,
+ FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_UShort setComponent;
+ FT_UShort dontAdvance;
+ FT_UShort offset;
+
+ FT_UNUSED( state );
+ FT_UNUSED( glyphOffset );
+ FT_UNUSED( limit );
+
+
+ setComponent = (FT_UShort)( ( flags >> 15 ) & 1 );
+ dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
+
+ offset = (FT_UShort)( flags & 0x3FFFU );
+
+ if ( 0 < offset )
+ gxv_mort_subtable_type2_ligActionOffset_validate( table, offset,
+ valid );
+ }
+
+
+ static void
+ gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table,
+ GXV_Validator valid )
+ {
+ GXV_mort_subtable_type2_StateOptRecData optdata =
+ (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata;
+
+ FT_Bytes p = table + optdata->ligatureTable;
+ FT_Bytes limit = table + optdata->ligatureTable
+ + optdata->ligatureTable_length;
+
+
+ GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" );
+ if ( 0 != optdata->ligatureTable )
+ {
+ /* Apple does not give specification of ligatureTable format */
+ while ( p < limit )
+ {
+ FT_UShort lig_gid;
+
+
+ GXV_LIMIT_CHECK( 2 );
+ lig_gid = FT_NEXT_USHORT( p );
+ }
+ }
+ GXV_EXIT;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ gxv_mort_subtable_type2_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ GXV_mort_subtable_type2_StateOptRec lig_rec;
+
+
+ GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" );
+
+ GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE );
+
+ valid->statetable.optdata =
+ &lig_rec;
+ valid->statetable.optdata_load_func =
+ gxv_mort_subtable_type2_opttable_load;
+ valid->statetable.subtable_setup_func =
+ gxv_mort_subtable_type2_subtable_setup;
+ valid->statetable.entry_glyphoffset_fmt =
+ GXV_GLYPHOFFSET_NONE;
+ valid->statetable.entry_validate_func =
+ gxv_mort_subtable_type2_entry_validate;
+
+ gxv_StateTable_validate( p, limit, valid );
+
+ p += valid->subtable_length;
+ gxv_mort_subtable_type2_ligatureTable_validate( table, valid );
+
+ valid->subtable_length = p - table;
+
+ GXV_EXIT;
+ }
+
+
+/* END */
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