227 lines
7.1 KiB
C
227 lines
7.1 KiB
C
/****************************************************************************
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*
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* gxvmorx5.c
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*
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* TrueTypeGX/AAT morx table validation
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* body for type5 (Contextual Glyph Insertion) subtable.
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*
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* Copyright (C) 2005-2022 by
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* 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 "gxvmorx.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 gxvmorx
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/*
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* `morx' subtable type5 (Contextual Glyph Insertion)
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* has format of a StateTable with insertion-glyph-list
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* without name. However, the 32bit offset from the head
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* of subtable to the i-g-l is given after `entryTable',
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* without variable name specification (the existence of
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* this offset to the table is different from mort type5).
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*/
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typedef struct GXV_morx_subtable_type5_StateOptRec_
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{
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FT_ULong insertionGlyphList;
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FT_ULong insertionGlyphList_length;
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} GXV_morx_subtable_type5_StateOptRec,
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*GXV_morx_subtable_type5_StateOptRecData;
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#define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE \
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( GXV_STATETABLE_HEADER_SIZE + 4 )
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static void
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gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type5_StateOptRecData optdata =
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(GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata;
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GXV_LIMIT_CHECK( 4 );
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optdata->insertionGlyphList = FT_NEXT_ULONG( p );
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}
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static void
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gxv_morx_subtable_type5_subtable_setup( FT_ULong table_size,
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FT_ULong classTable,
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FT_ULong stateArray,
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FT_ULong entryTable,
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FT_ULong* classTable_length_p,
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FT_ULong* stateArray_length_p,
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FT_ULong* entryTable_length_p,
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GXV_Validator gxvalid )
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{
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FT_ULong o[4];
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FT_ULong* l[4];
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FT_ULong buff[5];
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GXV_morx_subtable_type5_StateOptRecData optdata =
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(GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata;
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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->insertionGlyphList;
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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->insertionGlyphList_length);
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gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, gxvalid );
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}
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static void
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gxv_morx_subtable_type5_InsertList_validate( FT_UShort table_index,
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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 gxvalid )
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{
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FT_Bytes p = table + table_index * 2;
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#ifndef GXV_LOAD_TRACE_VARS
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GXV_LIMIT_CHECK( count * 2 );
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#else
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while ( p < table + count * 2 + table_index * 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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#endif
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}
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static void
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gxv_morx_subtable_type5_entry_validate(
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FT_UShort 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 gxvalid )
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{
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#ifdef GXV_LOAD_UNUSED_VARS
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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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#endif
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FT_Byte currentInsertCount;
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FT_Byte markedInsertCount;
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FT_Byte currentInsertList;
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FT_UShort markedInsertList;
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FT_UNUSED( state );
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#ifdef GXV_LOAD_UNUSED_VARS
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setMark = FT_BOOL( ( flags >> 15 ) & 1 );
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dontAdvance = FT_BOOL( ( flags >> 14 ) & 1 );
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currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
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markedIsKashidaLike = FT_BOOL( ( flags >> 12 ) & 1 );
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currentInsertBefore = FT_BOOL( ( flags >> 11 ) & 1 );
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markedInsertBefore = FT_BOOL( ( flags >> 10 ) & 1 );
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#endif
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currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F );
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markedInsertCount = (FT_Byte)( flags & 0x001F );
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currentInsertList = (FT_Byte) ( glyphOffset_p->ul >> 16 );
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markedInsertList = (FT_UShort)( glyphOffset_p->ul );
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if ( currentInsertList && 0 != currentInsertCount )
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gxv_morx_subtable_type5_InsertList_validate( currentInsertList,
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currentInsertCount,
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table, limit,
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gxvalid );
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if ( markedInsertList && 0 != markedInsertCount )
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gxv_morx_subtable_type5_InsertList_validate( markedInsertList,
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markedInsertCount,
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table, limit,
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gxvalid );
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}
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FT_LOCAL_DEF( void )
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gxv_morx_subtable_type5_validate( FT_Bytes table,
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FT_Bytes limit,
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GXV_Validator gxvalid )
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{
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FT_Bytes p = table;
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GXV_morx_subtable_type5_StateOptRec et_rec;
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GXV_morx_subtable_type5_StateOptRecData et = &et_rec;
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GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" );
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GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE );
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gxvalid->xstatetable.optdata =
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et;
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gxvalid->xstatetable.optdata_load_func =
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gxv_morx_subtable_type5_insertionGlyphList_load;
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gxvalid->xstatetable.subtable_setup_func =
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gxv_morx_subtable_type5_subtable_setup;
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gxvalid->xstatetable.entry_glyphoffset_fmt =
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GXV_GLYPHOFFSET_ULONG;
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gxvalid->xstatetable.entry_validate_func =
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gxv_morx_subtable_type5_entry_validate;
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gxv_XStateTable_validate( p, limit, gxvalid );
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GXV_EXIT;
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}
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/* END */
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