235 lines
7.8 KiB
C
235 lines
7.8 KiB
C
/****************************************************************************
|
|
*
|
|
* gxvmort5.c
|
|
*
|
|
* TrueTypeGX/AAT mort table validation
|
|
* body for type5 (Contextual Glyph Insertion) subtable.
|
|
*
|
|
* Copyright (C) 2005-2021 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 gxvmort
|
|
|
|
|
|
/*
|
|
* mort subtable type5 (Contextual Glyph Insertion)
|
|
* has the format of StateTable with insertion-glyph-list,
|
|
* but without name. The offset is given by glyphOffset in
|
|
* entryTable. There is no table location declaration
|
|
* like xxxTable.
|
|
*/
|
|
|
|
typedef struct GXV_mort_subtable_type5_StateOptRec_
|
|
{
|
|
FT_UShort classTable;
|
|
FT_UShort stateArray;
|
|
FT_UShort entryTable;
|
|
|
|
#define GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE GXV_STATETABLE_HEADER_SIZE
|
|
|
|
FT_UShort* classTable_length_p;
|
|
FT_UShort* stateArray_length_p;
|
|
FT_UShort* entryTable_length_p;
|
|
|
|
} GXV_mort_subtable_type5_StateOptRec,
|
|
*GXV_mort_subtable_type5_StateOptRecData;
|
|
|
|
|
|
FT_LOCAL_DEF( void )
|
|
gxv_mort_subtable_type5_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 gxvalid )
|
|
{
|
|
GXV_mort_subtable_type5_StateOptRecData optdata =
|
|
(GXV_mort_subtable_type5_StateOptRecData)gxvalid->statetable.optdata;
|
|
|
|
|
|
gxv_StateTable_subtable_setup( table_size,
|
|
classTable,
|
|
stateArray,
|
|
entryTable,
|
|
classTable_length_p,
|
|
stateArray_length_p,
|
|
entryTable_length_p,
|
|
gxvalid );
|
|
|
|
optdata->classTable = classTable;
|
|
optdata->stateArray = stateArray;
|
|
optdata->entryTable = entryTable;
|
|
|
|
optdata->classTable_length_p = classTable_length_p;
|
|
optdata->stateArray_length_p = stateArray_length_p;
|
|
optdata->entryTable_length_p = entryTable_length_p;
|
|
}
|
|
|
|
|
|
static void
|
|
gxv_mort_subtable_type5_InsertList_validate( FT_UShort offset,
|
|
FT_UShort count,
|
|
FT_Bytes table,
|
|
FT_Bytes limit,
|
|
GXV_Validator gxvalid )
|
|
{
|
|
/*
|
|
* We don't know the range of insertion-glyph-list.
|
|
* Set range by whole of state table.
|
|
*/
|
|
FT_Bytes p = table + offset;
|
|
|
|
GXV_mort_subtable_type5_StateOptRecData optdata =
|
|
(GXV_mort_subtable_type5_StateOptRecData)gxvalid->statetable.optdata;
|
|
|
|
if ( optdata->classTable < offset &&
|
|
offset < optdata->classTable + *(optdata->classTable_length_p) )
|
|
GXV_TRACE(( " offset runs into ClassTable" ));
|
|
if ( optdata->stateArray < offset &&
|
|
offset < optdata->stateArray + *(optdata->stateArray_length_p) )
|
|
GXV_TRACE(( " offset runs into StateArray" ));
|
|
if ( optdata->entryTable < offset &&
|
|
offset < optdata->entryTable + *(optdata->entryTable_length_p) )
|
|
GXV_TRACE(( " offset runs into EntryTable" ));
|
|
|
|
#ifndef GXV_LOAD_TRACE_VARS
|
|
GXV_LIMIT_CHECK( count * 2 );
|
|
#else
|
|
while ( p < table + offset + ( count * 2 ) )
|
|
{
|
|
FT_UShort insert_glyphID;
|
|
|
|
|
|
GXV_LIMIT_CHECK( 2 );
|
|
insert_glyphID = FT_NEXT_USHORT( p );
|
|
GXV_TRACE(( " 0x%04x", insert_glyphID ));
|
|
}
|
|
GXV_TRACE(( "\n" ));
|
|
#endif
|
|
}
|
|
|
|
|
|
static void
|
|
gxv_mort_subtable_type5_entry_validate(
|
|
FT_Byte state,
|
|
FT_UShort flags,
|
|
GXV_StateTable_GlyphOffsetCPtr glyphOffset,
|
|
FT_Bytes table,
|
|
FT_Bytes limit,
|
|
GXV_Validator gxvalid )
|
|
{
|
|
#ifdef GXV_LOAD_UNUSED_VARS
|
|
FT_Bool setMark;
|
|
FT_Bool dontAdvance;
|
|
FT_Bool currentIsKashidaLike;
|
|
FT_Bool markedIsKashidaLike;
|
|
FT_Bool currentInsertBefore;
|
|
FT_Bool markedInsertBefore;
|
|
#endif
|
|
FT_Byte currentInsertCount;
|
|
FT_Byte markedInsertCount;
|
|
FT_UShort currentInsertList;
|
|
FT_UShort markedInsertList;
|
|
|
|
FT_UNUSED( state );
|
|
|
|
|
|
#ifdef GXV_LOAD_UNUSED_VARS
|
|
setMark = FT_BOOL( ( flags >> 15 ) & 1 );
|
|
dontAdvance = FT_BOOL( ( flags >> 14 ) & 1 );
|
|
currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
|
|
markedIsKashidaLike = FT_BOOL( ( flags >> 12 ) & 1 );
|
|
currentInsertBefore = FT_BOOL( ( flags >> 11 ) & 1 );
|
|
markedInsertBefore = FT_BOOL( ( flags >> 10 ) & 1 );
|
|
#endif
|
|
|
|
currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F );
|
|
markedInsertCount = (FT_Byte)( flags & 0x001F );
|
|
|
|
currentInsertList = (FT_UShort)( glyphOffset->ul >> 16 );
|
|
markedInsertList = (FT_UShort)( glyphOffset->ul );
|
|
|
|
if ( 0 != currentInsertList && 0 != currentInsertCount )
|
|
{
|
|
gxv_mort_subtable_type5_InsertList_validate( currentInsertList,
|
|
currentInsertCount,
|
|
table,
|
|
limit,
|
|
gxvalid );
|
|
}
|
|
|
|
if ( 0 != markedInsertList && 0 != markedInsertCount )
|
|
{
|
|
gxv_mort_subtable_type5_InsertList_validate( markedInsertList,
|
|
markedInsertCount,
|
|
table,
|
|
limit,
|
|
gxvalid );
|
|
}
|
|
}
|
|
|
|
|
|
FT_LOCAL_DEF( void )
|
|
gxv_mort_subtable_type5_validate( FT_Bytes table,
|
|
FT_Bytes limit,
|
|
GXV_Validator gxvalid )
|
|
{
|
|
FT_Bytes p = table;
|
|
|
|
GXV_mort_subtable_type5_StateOptRec et_rec;
|
|
GXV_mort_subtable_type5_StateOptRecData et = &et_rec;
|
|
|
|
|
|
GXV_NAME_ENTER( "mort chain subtable type5 (Glyph Insertion)" );
|
|
|
|
GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE );
|
|
|
|
gxvalid->statetable.optdata =
|
|
et;
|
|
gxvalid->statetable.optdata_load_func =
|
|
NULL;
|
|
gxvalid->statetable.subtable_setup_func =
|
|
gxv_mort_subtable_type5_subtable_setup;
|
|
gxvalid->statetable.entry_glyphoffset_fmt =
|
|
GXV_GLYPHOFFSET_ULONG;
|
|
gxvalid->statetable.entry_validate_func =
|
|
gxv_mort_subtable_type5_entry_validate;
|
|
|
|
gxv_StateTable_validate( p, limit, gxvalid );
|
|
|
|
GXV_EXIT;
|
|
}
|
|
|
|
|
|
/* END */
|