ref: ece8b20e6c51924b85f3055e555a430a2d4bfd1b
dir: /src/otlayout/otlgdef.c/
/***************************************************************************/
/* */
/* otlgdef.c */
/* */
/* OpenType layout support, GDEF table (body). */
/* */
/* Copyright 2002, 2004 by */
/* 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. */
/* */
/***************************************************************************/
#include "otlgdef.h"
#include "otlcommn.h"
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** ATTACHMENTS LIST *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
otl_attach_point_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_UInt count;
OTL_CHECK( 2 );
count = OTL_NEXT_USHORT( p );
OTL_CHECK( count * 2 );
}
static void
otl_attach_list_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_Bytes coverage;
OTL_UInt num_glyphs;
OTL_CHECK( 4 );
coverage = table + OTL_NEXT_USHORT( p );
num_glyphs = OTL_NEXT_USHORT( p );
otl_coverage_validate( coverage, valid );
if ( num_glyphs != otl_coverage_get_count( coverage ) )
OTL_INVALID_DATA;
OTL_CHECK( num_glyphs * 2 );
/* scan attach point records */
for ( ; num_glyphs > 0; num_glyphs-- )
otl_attach_point_validate( table + OTL_NEXT_USHORT( p ), valid );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** LIGATURE CARETS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
otl_caret_value_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_Int format;
OTL_CHECK( 4 );
format = OTL_NEXT_USHORT( p );
switch ( format )
{
case 1:
/* skip coordinate, no test */
break;
case 2:
/* skip contour point index, no test */
break;
case 3:
p += 2; /* skip coordinate */
OTL_CHECK( 2 );
otl_device_table_validate( table + OTL_PEEK_USHORT( p ), valid );
break;
default:
OTL_INVALID_DATA;
}
}
static void
otl_ligature_glyph_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_UInt num_carets;
OTL_CHECK( 2 );
num_carets = OTL_NEXT_USHORT( p );
OTL_CHECK( num_carets * 2 );
/* scan caret value records */
for ( ; num_carets > 0; num_carets-- )
otl_caret_value_validate( table + OTL_NEXT_USHORT( p ), valid );
}
static void
otl_ligature_caret_list_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_Bytes coverage;
OTL_UInt num_ligglyphs;
OTL_CHECK( 4 );
coverage = table + OTL_NEXT_USHORT( p );
num_ligglyphs = OTL_NEXT_USHORT( p );
otl_coverage_validate( coverage, valid );
if ( num_ligglyphs != otl_coverage_get_count( coverage ) )
OTL_INVALID_DATA;
OTL_CHECK( num_ligglyphs * 2 );
/* scan ligature glyph records */
for ( ; num_ligglyphs > 0; num_ligglyphs-- )
otl_ligature_glyph_validate( table + OTL_NEXT_USHORT( p ), valid );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GDEF TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
OTL_APIDEF( void )
otl_gdef_validate( OTL_Bytes table,
OTL_Validator valid )
{
OTL_Bytes p = table;
OTL_UInt val;
OTL_CHECK( 12 );
/* check format */
if ( OTL_NEXT_ULONG( p ) != 0x00010000UL )
OTL_INVALID_FORMAT;
/* validate glyph class definition table */
val = OTL_NEXT_USHORT( p );
if ( val )
otl_class_definition_validate( table + val, valid );
/* validate attachment point list */
val = OTL_NEXT_USHORT( p );
if ( val )
otl_attach_list_validate( table + val, valid );
/* validate ligature caret list */
val = OTL_NEXT_USHORT( p );
if ( val )
otl_ligature_caret_list_validate( table + val, valid );
/* validate mark attachment class definition table */
val = OTL_NEXT_USHORT( p );
if ( val )
otl_class_definition_validate( table + val, valid );
}
/* END */