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