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5172
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/***************************************************************************/
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/* */
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/* otvcommn.c */
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/* */
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/* OpenType common tables validation (body). */
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/* */
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/* Copyright 2004, 2005, 2006, 2007 by */
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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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#include "otvcommn.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_otvcommon
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** COVERAGE TABLE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( void )
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otv_Coverage_validate( FT_Bytes table,
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OTV_Validator valid,
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FT_Int expected_count )
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{
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FT_Bytes p = table;
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FT_UInt CoverageFormat;
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FT_UInt total = 0;
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OTV_NAME_ENTER( "Coverage" );
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OTV_LIMIT_CHECK( 4 );
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CoverageFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", CoverageFormat ));
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switch ( CoverageFormat )
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{
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case 1: /* CoverageFormat1 */
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{
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FT_UInt GlyphCount;
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FT_UInt i;
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GlyphCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
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OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */
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for ( i = 0; i < GlyphCount; ++i )
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{
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FT_UInt gid;
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gid = FT_NEXT_USHORT( p );
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if ( gid >= valid->glyph_count )
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FT_INVALID_GLYPH_ID;
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}
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total = GlyphCount;
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}
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break;
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case 2: /* CoverageFormat2 */
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{
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FT_UInt n, RangeCount;
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FT_UInt Start, End, StartCoverageIndex, last = 0;
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RangeCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (RangeCount = %d)\n", RangeCount ));
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OTV_LIMIT_CHECK( RangeCount * 6 );
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/* RangeRecord */
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for ( n = 0; n < RangeCount; n++ )
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{
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Start = FT_NEXT_USHORT( p );
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End = FT_NEXT_USHORT( p );
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StartCoverageIndex = FT_NEXT_USHORT( p );
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if ( Start > End || StartCoverageIndex != total )
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FT_INVALID_DATA;
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if ( End >= valid->glyph_count )
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FT_INVALID_GLYPH_ID;
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if ( n > 0 && Start <= last )
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FT_INVALID_DATA;
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total += End - Start + 1;
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last = End;
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}
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}
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break;
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default:
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FT_INVALID_FORMAT;
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}
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/* Generally, a coverage table offset has an associated count field. */
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/* The number of glyphs in the table should match this field. If */
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/* there is no associated count, a value of -1 tells us not to check. */
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if ( expected_count != -1 && (FT_UInt)expected_count != total )
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FT_INVALID_DATA;
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OTV_EXIT;
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}
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FT_LOCAL_DEF( FT_UInt )
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otv_Coverage_get_first( FT_Bytes table )
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{
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FT_Bytes p = table;
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p += 4; /* skip CoverageFormat and Glyph/RangeCount */
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return FT_NEXT_USHORT( p );
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}
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FT_LOCAL_DEF( FT_UInt )
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otv_Coverage_get_last( FT_Bytes table )
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{
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FT_Bytes p = table;
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FT_UInt CoverageFormat = FT_NEXT_USHORT( p );
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FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */
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FT_UInt result = 0;
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switch ( CoverageFormat )
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{
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case 1:
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p += ( count - 1 ) * 2;
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result = FT_NEXT_USHORT( p );
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break;
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case 2:
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p += ( count - 1 ) * 6 + 2;
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result = FT_NEXT_USHORT( p );
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break;
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default:
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;
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}
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return result;
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}
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FT_LOCAL_DEF( FT_UInt )
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otv_Coverage_get_count( FT_Bytes table )
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{
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FT_Bytes p = table;
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FT_UInt CoverageFormat = FT_NEXT_USHORT( p );
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FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */
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FT_UInt result = 0;
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switch ( CoverageFormat )
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{
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case 1:
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return count;
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case 2:
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{
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FT_UInt Start, End;
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for ( ; count > 0; count-- )
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{
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Start = FT_NEXT_USHORT( p );
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End = FT_NEXT_USHORT( p );
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p += 2; /* skip StartCoverageIndex */
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result += End - Start + 1;
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}
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}
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break;
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default:
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;
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}
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return result;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** CLASS DEFINITION TABLE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_LOCAL_DEF( void )
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otv_ClassDef_validate( FT_Bytes table,
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OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt ClassFormat;
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OTV_NAME_ENTER( "ClassDef" );
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OTV_LIMIT_CHECK( 4 );
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ClassFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", ClassFormat ));
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switch ( ClassFormat )
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{
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case 1: /* ClassDefFormat1 */
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{
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FT_UInt StartGlyph;
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FT_UInt GlyphCount;
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242 |
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OTV_LIMIT_CHECK( 4 );
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StartGlyph = FT_NEXT_USHORT( p );
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GlyphCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
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249 |
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OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */
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251 |
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if ( StartGlyph + GlyphCount - 1 >= valid->glyph_count )
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FT_INVALID_GLYPH_ID;
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}
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break;
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case 2: /* ClassDefFormat2 */
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{
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FT_UInt n, ClassRangeCount;
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FT_UInt Start, End, last = 0;
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261 |
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262 |
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ClassRangeCount = FT_NEXT_USHORT( p );
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264 |
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OTV_TRACE(( " (ClassRangeCount = %d)\n", ClassRangeCount ));
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266 |
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OTV_LIMIT_CHECK( ClassRangeCount * 6 );
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268 |
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/* ClassRangeRecord */
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for ( n = 0; n < ClassRangeCount; n++ )
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{
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Start = FT_NEXT_USHORT( p );
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End = FT_NEXT_USHORT( p );
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p += 2; /* skip Class */
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275 |
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if ( Start > End || ( n > 0 && Start <= last ) )
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FT_INVALID_DATA;
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278 |
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if ( End >= valid->glyph_count )
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FT_INVALID_GLYPH_ID;
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last = End;
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}
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}
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break;
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default:
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FT_INVALID_FORMAT;
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}
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290 |
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/* no need to check glyph indices used as input to class definition */
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/* tables since even invalid glyph indices return a meaningful result */
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293 |
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OTV_EXIT;
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}
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296 |
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297 |
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298 |
/*************************************************************************/
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/*************************************************************************/
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300 |
/***** *****/
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301 |
/***** DEVICE TABLE *****/
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302 |
/***** *****/
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303 |
/*************************************************************************/
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304 |
/*************************************************************************/
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305 |
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306 |
FT_LOCAL_DEF( void )
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307 |
otv_Device_validate( FT_Bytes table,
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308 |
OTV_Validator valid )
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309 |
{
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310 |
FT_Bytes p = table;
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311 |
FT_UInt StartSize, EndSize, DeltaFormat, count;
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312 |
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313 |
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314 |
OTV_NAME_ENTER( "Device" );
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315 |
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316 |
OTV_LIMIT_CHECK( 8 );
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317 |
StartSize = FT_NEXT_USHORT( p );
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318 |
EndSize = FT_NEXT_USHORT( p );
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319 |
DeltaFormat = FT_NEXT_USHORT( p );
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320 |
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321 |
if ( DeltaFormat < 1 || DeltaFormat > 3 )
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FT_INVALID_FORMAT;
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323 |
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324 |
if ( EndSize < StartSize )
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FT_INVALID_DATA;
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326 |
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327 |
count = EndSize - StartSize + 1;
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328 |
OTV_LIMIT_CHECK( ( 1 << DeltaFormat ) * count / 8 ); /* DeltaValue */
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329 |
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330 |
OTV_EXIT;
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331 |
}
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332 |
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333 |
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334 |
/*************************************************************************/
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335 |
/*************************************************************************/
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336 |
/***** *****/
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337 |
/***** LOOKUPS *****/
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338 |
/***** *****/
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339 |
/*************************************************************************/
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340 |
/*************************************************************************/
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341 |
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342 |
/* uses valid->type_count */
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343 |
/* uses valid->type_funcs */
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344 |
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345 |
FT_LOCAL_DEF( void )
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346 |
otv_Lookup_validate( FT_Bytes table,
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347 |
OTV_Validator valid )
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348 |
{
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349 |
FT_Bytes p = table;
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350 |
FT_UInt LookupType, SubTableCount;
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351 |
OTV_Validate_Func validate;
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352 |
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353 |
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354 |
OTV_NAME_ENTER( "Lookup" );
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355 |
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356 |
OTV_LIMIT_CHECK( 6 );
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357 |
LookupType = FT_NEXT_USHORT( p );
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358 |
p += 2; /* skip LookupFlag */
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359 |
SubTableCount = FT_NEXT_USHORT( p );
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360 |
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361 |
OTV_TRACE(( " (type %d)\n", LookupType ));
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362 |
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363 |
if ( LookupType == 0 || LookupType > valid->type_count )
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364 |
FT_INVALID_DATA;
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365 |
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366 |
validate = valid->type_funcs[LookupType - 1];
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367 |
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368 |
OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount ));
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369 |
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370 |
OTV_LIMIT_CHECK( SubTableCount * 2 );
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371 |
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372 |
/* SubTable */
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373 |
for ( ; SubTableCount > 0; SubTableCount-- )
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374 |
validate( table + FT_NEXT_USHORT( p ), valid );
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375 |
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376 |
OTV_EXIT;
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377 |
}
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378 |
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379 |
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380 |
/* uses valid->lookup_count */
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381 |
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382 |
FT_LOCAL_DEF( void )
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|
383 |
otv_LookupList_validate( FT_Bytes table,
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|
384 |
OTV_Validator valid )
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|
385 |
{
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|
386 |
FT_Bytes p = table;
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|
387 |
FT_UInt LookupCount;
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388 |
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389 |
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390 |
OTV_NAME_ENTER( "LookupList" );
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391 |
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392 |
OTV_LIMIT_CHECK( 2 );
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393 |
LookupCount = FT_NEXT_USHORT( p );
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394 |
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395 |
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount ));
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396 |
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397 |
OTV_LIMIT_CHECK( LookupCount * 2 );
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398 |
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399 |
valid->lookup_count = LookupCount;
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400 |
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401 |
/* Lookup */
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402 |
for ( ; LookupCount > 0; LookupCount-- )
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403 |
otv_Lookup_validate( table + FT_NEXT_USHORT( p ), valid );
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404 |
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405 |
OTV_EXIT;
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|
406 |
}
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|
407 |
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|
408 |
|
|
|
409 |
static FT_UInt
|
|
|
410 |
otv_LookupList_get_count( FT_Bytes table )
|
|
|
411 |
{
|
|
|
412 |
return FT_NEXT_USHORT( table );
|
|
|
413 |
}
|
|
|
414 |
|
|
|
415 |
|
|
|
416 |
/*************************************************************************/
|
|
|
417 |
/*************************************************************************/
|
|
|
418 |
/***** *****/
|
|
|
419 |
/***** FEATURES *****/
|
|
|
420 |
/***** *****/
|
|
|
421 |
/*************************************************************************/
|
|
|
422 |
/*************************************************************************/
|
|
|
423 |
|
|
|
424 |
/* uses valid->lookup_count */
|
|
|
425 |
|
|
|
426 |
FT_LOCAL_DEF( void )
|
|
|
427 |
otv_Feature_validate( FT_Bytes table,
|
|
|
428 |
OTV_Validator valid )
|
|
|
429 |
{
|
|
|
430 |
FT_Bytes p = table;
|
|
|
431 |
FT_UInt LookupCount;
|
|
|
432 |
|
|
|
433 |
|
|
|
434 |
OTV_NAME_ENTER( "Feature" );
|
|
|
435 |
|
|
|
436 |
OTV_LIMIT_CHECK( 4 );
|
|
|
437 |
p += 2; /* skip FeatureParams (unused) */
|
|
|
438 |
LookupCount = FT_NEXT_USHORT( p );
|
|
|
439 |
|
|
|
440 |
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount ));
|
|
|
441 |
|
|
|
442 |
OTV_LIMIT_CHECK( LookupCount * 2 );
|
|
|
443 |
|
|
|
444 |
/* LookupListIndex */
|
|
|
445 |
for ( ; LookupCount > 0; LookupCount-- )
|
|
|
446 |
if ( FT_NEXT_USHORT( p ) >= valid->lookup_count )
|
|
|
447 |
FT_INVALID_DATA;
|
|
|
448 |
|
|
|
449 |
OTV_EXIT;
|
|
|
450 |
}
|
|
|
451 |
|
|
|
452 |
|
|
|
453 |
static FT_UInt
|
|
|
454 |
otv_Feature_get_count( FT_Bytes table )
|
|
|
455 |
{
|
|
|
456 |
return FT_NEXT_USHORT( table );
|
|
|
457 |
}
|
|
|
458 |
|
|
|
459 |
|
|
|
460 |
/* sets valid->lookup_count */
|
|
|
461 |
|
|
|
462 |
FT_LOCAL_DEF( void )
|
|
|
463 |
otv_FeatureList_validate( FT_Bytes table,
|
|
|
464 |
FT_Bytes lookups,
|
|
|
465 |
OTV_Validator valid )
|
|
|
466 |
{
|
|
|
467 |
FT_Bytes p = table;
|
|
|
468 |
FT_UInt FeatureCount;
|
|
|
469 |
|
|
|
470 |
|
|
|
471 |
OTV_NAME_ENTER( "FeatureList" );
|
|
|
472 |
|
|
|
473 |
OTV_LIMIT_CHECK( 2 );
|
|
|
474 |
FeatureCount = FT_NEXT_USHORT( p );
|
|
|
475 |
|
|
|
476 |
OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount ));
|
|
|
477 |
|
|
|
478 |
OTV_LIMIT_CHECK( FeatureCount * 2 );
|
|
|
479 |
|
|
|
480 |
valid->lookup_count = otv_LookupList_get_count( lookups );
|
|
|
481 |
|
|
|
482 |
/* FeatureRecord */
|
|
|
483 |
for ( ; FeatureCount > 0; FeatureCount-- )
|
|
|
484 |
{
|
|
|
485 |
p += 4; /* skip FeatureTag */
|
|
|
486 |
|
|
|
487 |
/* Feature */
|
|
|
488 |
otv_Feature_validate( table + FT_NEXT_USHORT( p ), valid );
|
|
|
489 |
}
|
|
|
490 |
|
|
|
491 |
OTV_EXIT;
|
|
|
492 |
}
|
|
|
493 |
|
|
|
494 |
|
|
|
495 |
/*************************************************************************/
|
|
|
496 |
/*************************************************************************/
|
|
|
497 |
/***** *****/
|
|
|
498 |
/***** LANGUAGE SYSTEM *****/
|
|
|
499 |
/***** *****/
|
|
|
500 |
/*************************************************************************/
|
|
|
501 |
/*************************************************************************/
|
|
|
502 |
|
|
|
503 |
|
|
|
504 |
/* uses valid->extra1 (number of features) */
|
|
|
505 |
|
|
|
506 |
FT_LOCAL_DEF( void )
|
|
|
507 |
otv_LangSys_validate( FT_Bytes table,
|
|
|
508 |
OTV_Validator valid )
|
|
|
509 |
{
|
|
|
510 |
FT_Bytes p = table;
|
|
|
511 |
FT_UInt ReqFeatureIndex;
|
|
|
512 |
FT_UInt FeatureCount;
|
|
|
513 |
|
|
|
514 |
|
|
|
515 |
OTV_NAME_ENTER( "LangSys" );
|
|
|
516 |
|
|
|
517 |
OTV_LIMIT_CHECK( 6 );
|
|
|
518 |
p += 2; /* skip LookupOrder (unused) */
|
|
|
519 |
ReqFeatureIndex = FT_NEXT_USHORT( p );
|
|
|
520 |
FeatureCount = FT_NEXT_USHORT( p );
|
|
|
521 |
|
|
|
522 |
OTV_TRACE(( " (ReqFeatureIndex = %d)\n", ReqFeatureIndex ));
|
|
|
523 |
OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount ));
|
|
|
524 |
|
|
|
525 |
if ( ReqFeatureIndex != 0xFFFFU && ReqFeatureIndex >= valid->extra1 )
|
|
|
526 |
FT_INVALID_DATA;
|
|
|
527 |
|
|
|
528 |
OTV_LIMIT_CHECK( FeatureCount * 2 );
|
|
|
529 |
|
|
|
530 |
/* FeatureIndex */
|
|
|
531 |
for ( ; FeatureCount > 0; FeatureCount-- )
|
|
|
532 |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 )
|
|
|
533 |
FT_INVALID_DATA;
|
|
|
534 |
|
|
|
535 |
OTV_EXIT;
|
|
|
536 |
}
|
|
|
537 |
|
|
|
538 |
|
|
|
539 |
/*************************************************************************/
|
|
|
540 |
/*************************************************************************/
|
|
|
541 |
/***** *****/
|
|
|
542 |
/***** SCRIPTS *****/
|
|
|
543 |
/***** *****/
|
|
|
544 |
/*************************************************************************/
|
|
|
545 |
/*************************************************************************/
|
|
|
546 |
|
|
|
547 |
FT_LOCAL_DEF( void )
|
|
|
548 |
otv_Script_validate( FT_Bytes table,
|
|
|
549 |
OTV_Validator valid )
|
|
|
550 |
{
|
|
|
551 |
FT_UInt DefaultLangSys, LangSysCount;
|
|
|
552 |
FT_Bytes p = table;
|
|
|
553 |
|
|
|
554 |
|
|
|
555 |
OTV_NAME_ENTER( "Script" );
|
|
|
556 |
|
|
|
557 |
OTV_LIMIT_CHECK( 4 );
|
|
|
558 |
DefaultLangSys = FT_NEXT_USHORT( p );
|
|
|
559 |
LangSysCount = FT_NEXT_USHORT( p );
|
|
|
560 |
|
|
|
561 |
OTV_TRACE(( " (LangSysCount = %d)\n", LangSysCount ));
|
|
|
562 |
|
|
|
563 |
if ( DefaultLangSys != 0 )
|
|
|
564 |
otv_LangSys_validate( table + DefaultLangSys, valid );
|
|
|
565 |
|
|
|
566 |
OTV_LIMIT_CHECK( LangSysCount * 6 );
|
|
|
567 |
|
|
|
568 |
/* LangSysRecord */
|
|
|
569 |
for ( ; LangSysCount > 0; LangSysCount-- )
|
|
|
570 |
{
|
|
|
571 |
p += 4; /* skip LangSysTag */
|
|
|
572 |
|
|
|
573 |
/* LangSys */
|
|
|
574 |
otv_LangSys_validate( table + FT_NEXT_USHORT( p ), valid );
|
|
|
575 |
}
|
|
|
576 |
|
|
|
577 |
OTV_EXIT;
|
|
|
578 |
}
|
|
|
579 |
|
|
|
580 |
|
|
|
581 |
/* sets valid->extra1 (number of features) */
|
|
|
582 |
|
|
|
583 |
FT_LOCAL_DEF( void )
|
|
|
584 |
otv_ScriptList_validate( FT_Bytes table,
|
|
|
585 |
FT_Bytes features,
|
|
|
586 |
OTV_Validator valid )
|
|
|
587 |
{
|
|
|
588 |
FT_UInt ScriptCount;
|
|
|
589 |
FT_Bytes p = table;
|
|
|
590 |
|
|
|
591 |
|
|
|
592 |
OTV_NAME_ENTER( "ScriptList" );
|
|
|
593 |
|
|
|
594 |
OTV_LIMIT_CHECK( 2 );
|
|
|
595 |
ScriptCount = FT_NEXT_USHORT( p );
|
|
|
596 |
|
|
|
597 |
OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount ));
|
|
|
598 |
|
|
|
599 |
OTV_LIMIT_CHECK( ScriptCount * 6 );
|
|
|
600 |
|
|
|
601 |
valid->extra1 = otv_Feature_get_count( features );
|
|
|
602 |
|
|
|
603 |
/* ScriptRecord */
|
|
|
604 |
for ( ; ScriptCount > 0; ScriptCount-- )
|
|
|
605 |
{
|
|
|
606 |
p += 4; /* skip ScriptTag */
|
|
|
607 |
|
|
|
608 |
otv_Script_validate( table + FT_NEXT_USHORT( p ), valid ); /* Script */
|
|
|
609 |
}
|
|
|
610 |
|
|
|
611 |
OTV_EXIT;
|
|
|
612 |
}
|
|
|
613 |
|
|
|
614 |
|
|
|
615 |
/*************************************************************************/
|
|
|
616 |
/*************************************************************************/
|
|
|
617 |
/***** *****/
|
|
|
618 |
/***** UTILITY FUNCTIONS *****/
|
|
|
619 |
/***** *****/
|
|
|
620 |
/*************************************************************************/
|
|
|
621 |
/*************************************************************************/
|
|
|
622 |
|
|
|
623 |
/*
|
|
|
624 |
u: uint16
|
|
|
625 |
ux: unit16 [x]
|
|
|
626 |
|
|
|
627 |
s: struct
|
|
|
628 |
sx: struct [x]
|
|
|
629 |
sxy: struct [x], using external y count
|
|
|
630 |
|
|
|
631 |
x: uint16 x
|
|
|
632 |
|
|
|
633 |
C: Coverage
|
|
|
634 |
|
|
|
635 |
O: Offset
|
|
|
636 |
On: Offset (NULL)
|
|
|
637 |
Ox: Offset [x]
|
|
|
638 |
Onx: Offset (NULL) [x]
|
|
|
639 |
*/
|
|
|
640 |
|
|
|
641 |
FT_LOCAL_DEF( void )
|
|
|
642 |
otv_x_Ox( FT_Bytes table,
|
|
|
643 |
OTV_Validator valid )
|
|
|
644 |
{
|
|
|
645 |
FT_Bytes p = table;
|
|
|
646 |
FT_UInt Count;
|
|
|
647 |
OTV_Validate_Func func;
|
|
|
648 |
|
|
|
649 |
|
|
|
650 |
OTV_ENTER;
|
|
|
651 |
|
|
|
652 |
OTV_LIMIT_CHECK( 2 );
|
|
|
653 |
Count = FT_NEXT_USHORT( p );
|
|
|
654 |
|
|
|
655 |
OTV_TRACE(( " (Count = %d)\n", Count ));
|
|
|
656 |
|
|
|
657 |
OTV_LIMIT_CHECK( Count * 2 );
|
|
|
658 |
|
|
|
659 |
valid->nesting_level++;
|
|
|
660 |
func = valid->func[valid->nesting_level];
|
|
|
661 |
|
|
|
662 |
for ( ; Count > 0; Count-- )
|
|
|
663 |
func( table + FT_NEXT_USHORT( p ), valid );
|
|
|
664 |
|
|
|
665 |
valid->nesting_level--;
|
|
|
666 |
|
|
|
667 |
OTV_EXIT;
|
|
|
668 |
}
|
|
|
669 |
|
|
|
670 |
|
|
|
671 |
FT_LOCAL_DEF( void )
|
|
|
672 |
otv_u_C_x_Ox( FT_Bytes table,
|
|
|
673 |
OTV_Validator valid )
|
|
|
674 |
{
|
|
|
675 |
FT_Bytes p = table;
|
|
|
676 |
FT_UInt Count, Coverage;
|
|
|
677 |
OTV_Validate_Func func;
|
|
|
678 |
|
|
|
679 |
|
|
|
680 |
OTV_ENTER;
|
|
|
681 |
|
|
|
682 |
p += 2; /* skip Format */
|
|
|
683 |
|
|
|
684 |
OTV_LIMIT_CHECK( 4 );
|
|
|
685 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
686 |
Count = FT_NEXT_USHORT( p );
|
|
|
687 |
|
|
|
688 |
OTV_TRACE(( " (Count = %d)\n", Count ));
|
|
|
689 |
|
|
|
690 |
otv_Coverage_validate( table + Coverage, valid, Count );
|
|
|
691 |
|
|
|
692 |
OTV_LIMIT_CHECK( Count * 2 );
|
|
|
693 |
|
|
|
694 |
valid->nesting_level++;
|
|
|
695 |
func = valid->func[valid->nesting_level];
|
|
|
696 |
|
|
|
697 |
for ( ; Count > 0; Count-- )
|
|
|
698 |
func( table + FT_NEXT_USHORT( p ), valid );
|
|
|
699 |
|
|
|
700 |
valid->nesting_level--;
|
|
|
701 |
|
|
|
702 |
OTV_EXIT;
|
|
|
703 |
}
|
|
|
704 |
|
|
|
705 |
|
|
|
706 |
/* uses valid->extra1 (if > 0: array value limit) */
|
|
|
707 |
|
|
|
708 |
FT_LOCAL_DEF( void )
|
|
|
709 |
otv_x_ux( FT_Bytes table,
|
|
|
710 |
OTV_Validator valid )
|
|
|
711 |
{
|
|
|
712 |
FT_Bytes p = table;
|
|
|
713 |
FT_UInt Count;
|
|
|
714 |
|
|
|
715 |
|
|
|
716 |
OTV_ENTER;
|
|
|
717 |
|
|
|
718 |
OTV_LIMIT_CHECK( 2 );
|
|
|
719 |
Count = FT_NEXT_USHORT( p );
|
|
|
720 |
|
|
|
721 |
OTV_TRACE(( " (Count = %d)\n", Count ));
|
|
|
722 |
|
|
|
723 |
OTV_LIMIT_CHECK( Count * 2 );
|
|
|
724 |
|
|
|
725 |
if ( valid->extra1 )
|
|
|
726 |
{
|
|
|
727 |
for ( ; Count > 0; Count-- )
|
|
|
728 |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 )
|
|
|
729 |
FT_INVALID_DATA;
|
|
|
730 |
}
|
|
|
731 |
|
|
|
732 |
OTV_EXIT;
|
|
|
733 |
}
|
|
|
734 |
|
|
|
735 |
|
|
|
736 |
/* `ux' in the function's name is not really correct since only x-1 */
|
|
|
737 |
/* elements are tested */
|
|
|
738 |
|
|
|
739 |
/* uses valid->extra1 (array value limit) */
|
|
|
740 |
|
|
|
741 |
FT_LOCAL_DEF( void )
|
|
|
742 |
otv_x_y_ux_sy( FT_Bytes table,
|
|
|
743 |
OTV_Validator valid )
|
|
|
744 |
{
|
|
|
745 |
FT_Bytes p = table;
|
|
|
746 |
FT_UInt Count1, Count2;
|
|
|
747 |
|
|
|
748 |
|
|
|
749 |
OTV_ENTER;
|
|
|
750 |
|
|
|
751 |
OTV_LIMIT_CHECK( 4 );
|
|
|
752 |
Count1 = FT_NEXT_USHORT( p );
|
|
|
753 |
Count2 = FT_NEXT_USHORT( p );
|
|
|
754 |
|
|
|
755 |
OTV_TRACE(( " (Count1 = %d)\n", Count1 ));
|
|
|
756 |
OTV_TRACE(( " (Count2 = %d)\n", Count2 ));
|
|
|
757 |
|
|
|
758 |
if ( Count1 == 0 )
|
|
|
759 |
FT_INVALID_DATA;
|
|
|
760 |
|
|
|
761 |
OTV_LIMIT_CHECK( ( Count1 - 1 ) * 2 + Count2 * 4 );
|
|
|
762 |
p += ( Count1 - 1 ) * 2;
|
|
|
763 |
|
|
|
764 |
for ( ; Count2 > 0; Count2-- )
|
|
|
765 |
{
|
|
|
766 |
if ( FT_NEXT_USHORT( p ) >= Count1 )
|
|
|
767 |
FT_INVALID_DATA;
|
|
|
768 |
|
|
|
769 |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 )
|
|
|
770 |
FT_INVALID_DATA;
|
|
|
771 |
}
|
|
|
772 |
|
|
|
773 |
OTV_EXIT;
|
|
|
774 |
}
|
|
|
775 |
|
|
|
776 |
|
|
|
777 |
/* `uy' in the function's name is not really correct since only y-1 */
|
|
|
778 |
/* elements are tested */
|
|
|
779 |
|
|
|
780 |
/* uses valid->extra1 (array value limit) */
|
|
|
781 |
|
|
|
782 |
FT_LOCAL_DEF( void )
|
|
|
783 |
otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table,
|
|
|
784 |
OTV_Validator valid )
|
|
|
785 |
{
|
|
|
786 |
FT_Bytes p = table;
|
|
|
787 |
FT_UInt BacktrackCount, InputCount, LookaheadCount;
|
|
|
788 |
FT_UInt Count;
|
|
|
789 |
|
|
|
790 |
|
|
|
791 |
OTV_ENTER;
|
|
|
792 |
|
|
|
793 |
OTV_LIMIT_CHECK( 2 );
|
|
|
794 |
BacktrackCount = FT_NEXT_USHORT( p );
|
|
|
795 |
|
|
|
796 |
OTV_TRACE(( " (BacktrackCount = %d)\n", BacktrackCount ));
|
|
|
797 |
|
|
|
798 |
OTV_LIMIT_CHECK( BacktrackCount * 2 + 2 );
|
|
|
799 |
p += BacktrackCount * 2;
|
|
|
800 |
|
|
|
801 |
InputCount = FT_NEXT_USHORT( p );
|
|
|
802 |
if ( InputCount == 0 )
|
|
|
803 |
FT_INVALID_DATA;
|
|
|
804 |
|
|
|
805 |
OTV_TRACE(( " (InputCount = %d)\n", InputCount ));
|
|
|
806 |
|
|
|
807 |
OTV_LIMIT_CHECK( InputCount * 2 );
|
|
|
808 |
p += ( InputCount - 1 ) * 2;
|
|
|
809 |
|
|
|
810 |
LookaheadCount = FT_NEXT_USHORT( p );
|
|
|
811 |
|
|
|
812 |
OTV_TRACE(( " (LookaheadCount = %d)\n", LookaheadCount ));
|
|
|
813 |
|
|
|
814 |
OTV_LIMIT_CHECK( LookaheadCount * 2 + 2 );
|
|
|
815 |
p += LookaheadCount * 2;
|
|
|
816 |
|
|
|
817 |
Count = FT_NEXT_USHORT( p );
|
|
|
818 |
|
|
|
819 |
OTV_TRACE(( " (Count = %d)\n", Count ));
|
|
|
820 |
|
|
|
821 |
OTV_LIMIT_CHECK( Count * 4 );
|
|
|
822 |
|
|
|
823 |
for ( ; Count > 0; Count-- )
|
|
|
824 |
{
|
|
|
825 |
if ( FT_NEXT_USHORT( p ) >= InputCount )
|
|
|
826 |
FT_INVALID_DATA;
|
|
|
827 |
|
|
|
828 |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 )
|
|
|
829 |
FT_INVALID_DATA;
|
|
|
830 |
}
|
|
|
831 |
|
|
|
832 |
OTV_EXIT;
|
|
|
833 |
}
|
|
|
834 |
|
|
|
835 |
|
|
|
836 |
/* sets valid->extra1 (valid->lookup_count) */
|
|
|
837 |
|
|
|
838 |
FT_LOCAL_DEF( void )
|
|
|
839 |
otv_u_O_O_x_Onx( FT_Bytes table,
|
|
|
840 |
OTV_Validator valid )
|
|
|
841 |
{
|
|
|
842 |
FT_Bytes p = table;
|
|
|
843 |
FT_UInt Coverage, ClassDef, ClassSetCount;
|
|
|
844 |
OTV_Validate_Func func;
|
|
|
845 |
|
|
|
846 |
|
|
|
847 |
OTV_ENTER;
|
|
|
848 |
|
|
|
849 |
p += 2; /* skip Format */
|
|
|
850 |
|
|
|
851 |
OTV_LIMIT_CHECK( 6 );
|
|
|
852 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
853 |
ClassDef = FT_NEXT_USHORT( p );
|
|
|
854 |
ClassSetCount = FT_NEXT_USHORT( p );
|
|
|
855 |
|
|
|
856 |
OTV_TRACE(( " (ClassSetCount = %d)\n", ClassSetCount ));
|
|
|
857 |
|
|
|
858 |
otv_Coverage_validate( table + Coverage, valid, -1 );
|
|
|
859 |
otv_ClassDef_validate( table + ClassDef, valid );
|
|
|
860 |
|
|
|
861 |
OTV_LIMIT_CHECK( ClassSetCount * 2 );
|
|
|
862 |
|
|
|
863 |
valid->nesting_level++;
|
|
|
864 |
func = valid->func[valid->nesting_level];
|
|
|
865 |
valid->extra1 = valid->lookup_count;
|
|
|
866 |
|
|
|
867 |
for ( ; ClassSetCount > 0; ClassSetCount-- )
|
|
|
868 |
{
|
|
|
869 |
FT_UInt offset = FT_NEXT_USHORT( p );
|
|
|
870 |
|
|
|
871 |
|
|
|
872 |
if ( offset )
|
|
|
873 |
func( table + offset, valid );
|
|
|
874 |
}
|
|
|
875 |
|
|
|
876 |
valid->nesting_level--;
|
|
|
877 |
|
|
|
878 |
OTV_EXIT;
|
|
|
879 |
}
|
|
|
880 |
|
|
|
881 |
|
|
|
882 |
/* uses valid->lookup_count */
|
|
|
883 |
|
|
|
884 |
FT_LOCAL_DEF( void )
|
|
|
885 |
otv_u_x_y_Ox_sy( FT_Bytes table,
|
|
|
886 |
OTV_Validator valid )
|
|
|
887 |
{
|
|
|
888 |
FT_Bytes p = table;
|
|
|
889 |
FT_UInt GlyphCount, Count, count1;
|
|
|
890 |
|
|
|
891 |
|
|
|
892 |
OTV_ENTER;
|
|
|
893 |
|
|
|
894 |
p += 2; /* skip Format */
|
|
|
895 |
|
|
|
896 |
OTV_LIMIT_CHECK( 4 );
|
|
|
897 |
GlyphCount = FT_NEXT_USHORT( p );
|
|
|
898 |
Count = FT_NEXT_USHORT( p );
|
|
|
899 |
|
|
|
900 |
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
|
|
|
901 |
OTV_TRACE(( " (Count = %d)\n", Count ));
|
|
|
902 |
|
|
|
903 |
OTV_LIMIT_CHECK( GlyphCount * 2 + Count * 4 );
|
|
|
904 |
|
|
|
905 |
for ( count1 = GlyphCount; count1 > 0; count1-- )
|
|
|
906 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
907 |
|
|
|
908 |
for ( ; Count > 0; Count-- )
|
|
|
909 |
{
|
|
|
910 |
if ( FT_NEXT_USHORT( p ) >= GlyphCount )
|
|
|
911 |
FT_INVALID_DATA;
|
|
|
912 |
|
|
|
913 |
if ( FT_NEXT_USHORT( p ) >= valid->lookup_count )
|
|
|
914 |
FT_INVALID_DATA;
|
|
|
915 |
}
|
|
|
916 |
|
|
|
917 |
OTV_EXIT;
|
|
|
918 |
}
|
|
|
919 |
|
|
|
920 |
|
|
|
921 |
/* sets valid->extra1 (valid->lookup_count) */
|
|
|
922 |
|
|
|
923 |
FT_LOCAL_DEF( void )
|
|
|
924 |
otv_u_O_O_O_O_x_Onx( FT_Bytes table,
|
|
|
925 |
OTV_Validator valid )
|
|
|
926 |
{
|
|
|
927 |
FT_Bytes p = table;
|
|
|
928 |
FT_UInt Coverage;
|
|
|
929 |
FT_UInt BacktrackClassDef, InputClassDef, LookaheadClassDef;
|
|
|
930 |
FT_UInt ChainClassSetCount;
|
|
|
931 |
OTV_Validate_Func func;
|
|
|
932 |
|
|
|
933 |
|
|
|
934 |
OTV_ENTER;
|
|
|
935 |
|
|
|
936 |
p += 2; /* skip Format */
|
|
|
937 |
|
|
|
938 |
OTV_LIMIT_CHECK( 10 );
|
|
|
939 |
Coverage = FT_NEXT_USHORT( p );
|
|
|
940 |
BacktrackClassDef = FT_NEXT_USHORT( p );
|
|
|
941 |
InputClassDef = FT_NEXT_USHORT( p );
|
|
|
942 |
LookaheadClassDef = FT_NEXT_USHORT( p );
|
|
|
943 |
ChainClassSetCount = FT_NEXT_USHORT( p );
|
|
|
944 |
|
|
|
945 |
OTV_TRACE(( " (ChainClassSetCount = %d)\n", ChainClassSetCount ));
|
|
|
946 |
|
|
|
947 |
otv_Coverage_validate( table + Coverage, valid, -1 );
|
|
|
948 |
|
|
|
949 |
otv_ClassDef_validate( table + BacktrackClassDef, valid );
|
|
|
950 |
otv_ClassDef_validate( table + InputClassDef, valid );
|
|
|
951 |
otv_ClassDef_validate( table + LookaheadClassDef, valid );
|
|
|
952 |
|
|
|
953 |
OTV_LIMIT_CHECK( ChainClassSetCount * 2 );
|
|
|
954 |
|
|
|
955 |
valid->nesting_level++;
|
|
|
956 |
func = valid->func[valid->nesting_level];
|
|
|
957 |
valid->extra1 = valid->lookup_count;
|
|
|
958 |
|
|
|
959 |
for ( ; ChainClassSetCount > 0; ChainClassSetCount-- )
|
|
|
960 |
{
|
|
|
961 |
FT_UInt offset = FT_NEXT_USHORT( p );
|
|
|
962 |
|
|
|
963 |
|
|
|
964 |
if ( offset )
|
|
|
965 |
func( table + offset, valid );
|
|
|
966 |
}
|
|
|
967 |
|
|
|
968 |
valid->nesting_level--;
|
|
|
969 |
|
|
|
970 |
OTV_EXIT;
|
|
|
971 |
}
|
|
|
972 |
|
|
|
973 |
|
|
|
974 |
/* uses valid->lookup_count */
|
|
|
975 |
|
|
|
976 |
FT_LOCAL_DEF( void )
|
|
|
977 |
otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table,
|
|
|
978 |
OTV_Validator valid )
|
|
|
979 |
{
|
|
|
980 |
FT_Bytes p = table;
|
|
|
981 |
FT_UInt BacktrackGlyphCount, InputGlyphCount, LookaheadGlyphCount;
|
|
|
982 |
FT_UInt count1, count2;
|
|
|
983 |
|
|
|
984 |
|
|
|
985 |
OTV_ENTER;
|
|
|
986 |
|
|
|
987 |
p += 2; /* skip Format */
|
|
|
988 |
|
|
|
989 |
OTV_LIMIT_CHECK( 2 );
|
|
|
990 |
BacktrackGlyphCount = FT_NEXT_USHORT( p );
|
|
|
991 |
|
|
|
992 |
OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount ));
|
|
|
993 |
|
|
|
994 |
OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 );
|
|
|
995 |
|
|
|
996 |
for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- )
|
|
|
997 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
998 |
|
|
|
999 |
InputGlyphCount = FT_NEXT_USHORT( p );
|
|
|
1000 |
|
|
|
1001 |
OTV_TRACE(( " (InputGlyphCount = %d)\n", InputGlyphCount ));
|
|
|
1002 |
|
|
|
1003 |
OTV_LIMIT_CHECK( InputGlyphCount * 2 + 2 );
|
|
|
1004 |
|
|
|
1005 |
for ( count1 = InputGlyphCount; count1 > 0; count1-- )
|
|
|
1006 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
1007 |
|
|
|
1008 |
LookaheadGlyphCount = FT_NEXT_USHORT( p );
|
|
|
1009 |
|
|
|
1010 |
OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount ));
|
|
|
1011 |
|
|
|
1012 |
OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 );
|
|
|
1013 |
|
|
|
1014 |
for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- )
|
|
|
1015 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
1016 |
|
|
|
1017 |
count2 = FT_NEXT_USHORT( p );
|
|
|
1018 |
|
|
|
1019 |
OTV_TRACE(( " (Count = %d)\n", count2 ));
|
|
|
1020 |
|
|
|
1021 |
OTV_LIMIT_CHECK( count2 * 4 );
|
|
|
1022 |
|
|
|
1023 |
for ( ; count2 > 0; count2-- )
|
|
|
1024 |
{
|
|
|
1025 |
if ( FT_NEXT_USHORT( p ) >= InputGlyphCount )
|
|
|
1026 |
FT_INVALID_DATA;
|
|
|
1027 |
|
|
|
1028 |
if ( FT_NEXT_USHORT( p ) >= valid->lookup_count )
|
|
|
1029 |
FT_INVALID_DATA;
|
|
|
1030 |
}
|
|
|
1031 |
|
|
|
1032 |
OTV_EXIT;
|
|
|
1033 |
}
|
|
|
1034 |
|
|
|
1035 |
|
|
|
1036 |
FT_LOCAL_DEF( FT_UInt )
|
|
|
1037 |
otv_GSUBGPOS_get_Lookup_count( FT_Bytes table )
|
|
|
1038 |
{
|
|
|
1039 |
FT_Bytes p = table + 8;
|
|
|
1040 |
|
|
|
1041 |
|
|
|
1042 |
return otv_LookupList_get_count( table + FT_NEXT_USHORT( p ) );
|
|
|
1043 |
}
|
|
|
1044 |
|
|
|
1045 |
|
|
|
1046 |
FT_LOCAL_DEF( FT_UInt )
|
|
|
1047 |
otv_GSUBGPOS_have_MarkAttachmentType_flag( FT_Bytes table )
|
|
|
1048 |
{
|
|
|
1049 |
FT_Bytes p, lookup;
|
|
|
1050 |
FT_UInt count;
|
|
|
1051 |
|
|
|
1052 |
|
|
|
1053 |
if ( !table )
|
|
|
1054 |
return 0;
|
|
|
1055 |
|
|
|
1056 |
/* LookupList */
|
|
|
1057 |
p = table + 8;
|
|
|
1058 |
table += FT_NEXT_USHORT( p );
|
|
|
1059 |
|
|
|
1060 |
/* LookupCount */
|
|
|
1061 |
p = table;
|
|
|
1062 |
count = FT_NEXT_USHORT( p );
|
|
|
1063 |
|
|
|
1064 |
for ( ; count > 0; count-- )
|
|
|
1065 |
{
|
|
|
1066 |
FT_Bytes oldp;
|
|
|
1067 |
|
|
|
1068 |
|
|
|
1069 |
/* Lookup */
|
|
|
1070 |
lookup = table + FT_NEXT_USHORT( p );
|
|
|
1071 |
|
|
|
1072 |
oldp = p;
|
|
|
1073 |
|
|
|
1074 |
/* LookupFlag */
|
|
|
1075 |
p = lookup + 2;
|
|
|
1076 |
if ( FT_NEXT_USHORT( p ) & 0xFF00U )
|
|
|
1077 |
return 1;
|
|
|
1078 |
|
|
|
1079 |
p = oldp;
|
|
|
1080 |
}
|
|
|
1081 |
|
|
|
1082 |
return 0;
|
|
|
1083 |
}
|
|
|
1084 |
|
|
|
1085 |
|
|
|
1086 |
/* END */
|