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-rw-r--r--src/gxvalid/gxvmorx1.c274
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diff --git a/src/gxvalid/gxvmorx1.c b/src/gxvalid/gxvmorx1.c
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+/***************************************************************************/
+/* */
+/* gxvmorx1.c */
+/* */
+/* TrueTypeGX/AAT morx table validation */
+/* body for type1 (Contextual Substitution) subtable. */
+/* */
+/* Copyright 2005, 2007 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 "gxvmorx.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_gxvmorx
+
+
+ typedef struct GXV_morx_subtable_type1_StateOptRec_
+ {
+ FT_ULong substitutionTable;
+ FT_ULong substitutionTable_length;
+ FT_UShort substitutionTable_num_lookupTables;
+
+ } GXV_morx_subtable_type1_StateOptRec,
+ *GXV_morx_subtable_type1_StateOptRecData;
+
+
+#define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE \
+ ( GXV_STATETABLE_HEADER_SIZE + 2 )
+
+
+ static void
+ gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ GXV_morx_subtable_type1_StateOptRecData optdata =
+ (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
+
+
+ GXV_LIMIT_CHECK( 2 );
+ optdata->substitutionTable = FT_NEXT_USHORT( p );
+ }
+
+
+ static void
+ gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size,
+ FT_ULong classTable,
+ FT_ULong stateArray,
+ FT_ULong entryTable,
+ FT_ULong* classTable_length_p,
+ FT_ULong* stateArray_length_p,
+ FT_ULong* entryTable_length_p,
+ GXV_Validator valid )
+ {
+ FT_ULong o[4];
+ FT_ULong *l[4];
+ FT_ULong buff[5];
+
+ GXV_morx_subtable_type1_StateOptRecData optdata =
+ (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
+
+
+ o[0] = classTable;
+ o[1] = stateArray;
+ o[2] = entryTable;
+ o[3] = optdata->substitutionTable;
+ l[0] = classTable_length_p;
+ l[1] = stateArray_length_p;
+ l[2] = entryTable_length_p;
+ l[3] = &(optdata->substitutionTable_length);
+
+ gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
+ }
+
+
+ static void
+ gxv_morx_subtable_type1_entry_validate(
+ FT_UShort state,
+ FT_UShort flags,
+ GXV_StateTable_GlyphOffsetDesc glyphOffset,
+ FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_UShort setMark;
+ FT_UShort dontAdvance;
+ FT_UShort reserved;
+ FT_Short markIndex;
+ FT_Short currentIndex;
+
+ GXV_morx_subtable_type1_StateOptRecData optdata =
+ (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
+
+ FT_UNUSED( state );
+ FT_UNUSED( table );
+ FT_UNUSED( limit );
+
+
+ setMark = (FT_UShort)( ( flags >> 15 ) & 1 );
+ dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
+
+ reserved = (FT_UShort)( flags & 0x3FFF );
+
+ markIndex = (FT_Short)( glyphOffset.ul >> 16 );
+ currentIndex = (FT_Short)( glyphOffset.ul );
+
+ GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n",
+ setMark, dontAdvance ));
+
+ if ( 0 < reserved )
+ {
+ GXV_TRACE(( " non-zero bits found in reserved range\n" ));
+ if ( valid->root->level >= FT_VALIDATE_PARANOID )
+ FT_INVALID_DATA;
+ }
+
+ GXV_TRACE(( "markIndex = %d, currentIndex = %d\n",
+ markIndex, currentIndex ));
+
+ if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 )
+ optdata->substitutionTable_num_lookupTables =
+ (FT_Short)( markIndex + 1 );
+
+ if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 )
+ optdata->substitutionTable_num_lookupTables =
+ (FT_Short)( currentIndex + 1 );
+ }
+
+
+ static void
+ gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph,
+ GXV_LookupValueDesc value,
+ GXV_Validator valid )
+ {
+ FT_UNUSED( glyph ); /* for the non-debugging case */
+
+ GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value.u ));
+
+ if ( value.u > valid->face->num_glyphs )
+ FT_INVALID_GLYPH_ID;
+ }
+
+
+ static GXV_LookupValueDesc
+ gxv_morx_subtable_type1_LookupFmt4_transit(
+ FT_UShort relative_gindex,
+ GXV_LookupValueDesc base_value,
+ FT_Bytes lookuptbl_limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p;
+ FT_Bytes limit;
+ FT_UShort offset;
+ GXV_LookupValueDesc value;
+
+ /* XXX: check range? */
+ offset = (FT_UShort)( base_value.u +
+ relative_gindex * sizeof ( FT_UShort ) );
+
+ p = valid->lookuptbl_head + offset;
+ limit = lookuptbl_limit;
+
+ GXV_LIMIT_CHECK ( 2 );
+ value.u = FT_NEXT_USHORT( p );
+
+ return value;
+ }
+
+
+ /*
+ * TODO: length should be limit?
+ **/
+ static void
+ gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+ FT_UShort i;
+
+ GXV_morx_subtable_type1_StateOptRecData optdata =
+ (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata;
+
+
+ /* TODO: calculate offset/length for each lookupTables */
+ valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED;
+ valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate;
+ valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit;
+
+ for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ )
+ {
+ FT_ULong offset;
+
+
+ GXV_LIMIT_CHECK( 4 );
+ offset = FT_NEXT_ULONG( p );
+
+ gxv_LookupTable_validate( table + offset, limit, valid );
+ }
+
+ /* TODO: overlapping of lookupTables in substitutionTable */
+ }
+
+
+ /*
+ * subtable for Contextual glyph substitution is a modified StateTable.
+ * In addition to classTable, stateArray, entryTable, the field
+ * `substitutionTable' is added.
+ */
+ FT_LOCAL_DEF( void )
+ gxv_morx_subtable_type1_validate( FT_Bytes table,
+ FT_Bytes limit,
+ GXV_Validator valid )
+ {
+ FT_Bytes p = table;
+
+ GXV_morx_subtable_type1_StateOptRec st_rec;
+
+
+ GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" );
+
+ GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE );
+
+ st_rec.substitutionTable_num_lookupTables = 0;
+
+ valid->xstatetable.optdata =
+ &st_rec;
+ valid->xstatetable.optdata_load_func =
+ gxv_morx_subtable_type1_substitutionTable_load;
+ valid->xstatetable.subtable_setup_func =
+ gxv_morx_subtable_type1_subtable_setup;
+ valid->xstatetable.entry_glyphoffset_fmt =
+ GXV_GLYPHOFFSET_ULONG;
+ valid->xstatetable.entry_validate_func =
+ gxv_morx_subtable_type1_entry_validate;
+
+ gxv_XStateTable_validate( p, limit, valid );
+
+ gxv_morx_subtable_type1_substitutionTable_validate(
+ table + st_rec.substitutionTable,
+ table + st_rec.substitutionTable + st_rec.substitutionTable_length,
+ valid );
+
+ GXV_EXIT;
+ }
+
+
+/* END */
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