201 lines
8.5 KiB
C
201 lines
8.5 KiB
C
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/***************************************************************************/
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/* */
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/* gxvmort5.c */
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/* */
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/* TrueTypeGX/AAT mort table validation */
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/* body for type5 (Contextual Glyph Insertion) 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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/* gxvalid is derived from both gxlayout module and otvalid module. */
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/* Development of gxlayout was support of Information-technology Promotion */
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/* Agency(IPA), Japan. */
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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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/*
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* mort subtable type5 (Contextual Glyph Insertion)
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* has format of StateTable with insertion-glyph-list
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* without name. the offset is given by glyphOffset in
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* entryTable. there's no table location declaration
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* like xxxTable.
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*/
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typedef struct GXV_mort_subtable_type5_StateOptRec_
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{
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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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#define GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE GXV_STATETABLE_HEADER_SIZE
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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_mort_subtable_type5_StateOptRec,
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*GXV_mort_subtable_type5_StateOptRecData;
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FT_LOCAL_DEF( void )
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gxv_mort_subtable_type5_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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GXV_mort_subtable_type5_StateOptRecData optdata = valid->statetable.optdata;
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gxv_StateTable_subtable_setup( table_size,
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classTable,
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stateArray,
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entryTable,
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classTable_length_p,
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stateArray_length_p,
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entryTable_length_p,
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valid );
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optdata->classTable = classTable;
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optdata->stateArray = stateArray;
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optdata->entryTable = entryTable;
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optdata->classTable_length_p = classTable_length_p;
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optdata->stateArray_length_p = stateArray_length_p;
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optdata->entryTable_length_p = entryTable_length_p;
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}
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static void
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gxv_mort_subtable_type5_InsertList_validate( FT_UShort offset,
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FT_UShort count,
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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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/*
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* we don't know the range of insertion-glyph-list.
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* set range by whole of state table
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*/
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FT_Bytes p = table + offset;
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GXV_mort_subtable_type5_StateOptRecData optdata = valid->statetable.optdata;
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if ( optdata->classTable < offset &&
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offset < optdata->classTable + *(optdata->classTable_length_p) )
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GXV_TRACE(( " offset runs into ClassTable" ));
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if ( optdata->stateArray < offset &&
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offset < optdata->stateArray + *(optdata->stateArray_length_p) )
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GXV_TRACE(( " offset runs into StateArray" ));
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if ( optdata->entryTable < offset &&
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offset < optdata->entryTable + *(optdata->entryTable_length_p) )
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GXV_TRACE(( " offset runs into EntryTable" ));
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while ( p < table + offset + ( count * 2 ) )
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{
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FT_UShort insert_glyphID;
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GXV_LIMIT_CHECK( 2 );
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insert_glyphID = FT_NEXT_USHORT( p );
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GXV_TRACE(( " 0x%04x", insert_glyphID ));
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}
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GXV_TRACE(( "\n" ));
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}
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static void
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gxv_mort_subtable_type5_entry_validate( FT_Byte state,
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FT_UShort flags,
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GXV_StateTable_GlyphOffsetDesc glyphOffset,
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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_Bool setMark;
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FT_Bool dontAdvance;
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FT_Bool currentIsKashidaLike;
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FT_Bool markedIsKashidaLike;
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FT_Bool currentInsertBefore;
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FT_Bool markedInsertBefore;
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FT_Byte currentInsertCount;
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FT_Byte markedInsertCount;
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FT_UShort currentInsertList;
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FT_UShort markedInsertList;
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setMark = ( flags >> 15 ) & 1;
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dontAdvance = ( flags >> 14 ) & 1;
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currentIsKashidaLike = ( flags >> 13 ) & 1;
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markedIsKashidaLike = ( flags >> 12 ) & 1;
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currentInsertBefore = ( flags >> 11 ) & 1;
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markedInsertBefore = ( flags >> 10 ) & 1;
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currentInsertCount = ( flags & 0x03E0 ) / 0x0020;
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markedInsertCount = ( flags & 0x001F );
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currentInsertList = glyphOffset.ul / 0x00010000;
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markedInsertList = glyphOffset.ul & 0x0000FFFF;
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if ( 0 != currentInsertList && 0 != currentInsertCount )
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{
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gxv_mort_subtable_type5_InsertList_validate( currentInsertList,
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currentInsertCount,
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table,
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limit,
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valid );
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}
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if ( 0 != markedInsertList && 0 != markedInsertCount )
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{
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gxv_mort_subtable_type5_InsertList_validate( markedInsertList,
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markedInsertCount,
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table,
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limit,
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valid );
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}
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}
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static void
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gxv_mort_subtable_type5_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_type5_StateOptRec et_rec;
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GXV_mort_subtable_type5_StateOptRecData et = &et_rec;
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GXV_NAME_ENTER( "mort chain subtable type5 (Glyph Insertion)" );
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GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE );
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valid->statetable.optdata = et;
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valid->statetable.optdata_load_func = NULL;
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valid->statetable.subtable_setup_func = gxv_mort_subtable_type5_subtable_setup;
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valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_ULONG;
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valid->statetable.entry_validate_func = gxv_mort_subtable_type5_entry_validate;
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gxv_StateTable_validate( p, limit, valid );
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GXV_EXIT;
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}
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/* END */
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