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5172
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/***************************************************************************/
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/* */
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/* otvgsub.c */
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/* */
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/* OpenType GSUB table validation (body). */
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/* */
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/* Copyright 2004, 2005, 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 "otvalid.h"
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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_otvgsub
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 1 *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* uses valid->glyph_count */
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static void
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otv_SingleSubst_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 SubstFormat;
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OTV_NAME_ENTER( "SingleSubst" );
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OTV_LIMIT_CHECK( 2 );
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SubstFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", SubstFormat ));
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switch ( SubstFormat )
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{
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case 1: /* SingleSubstFormat1 */
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{
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FT_Bytes Coverage;
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FT_Int DeltaGlyphID;
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FT_Long idx;
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OTV_LIMIT_CHECK( 4 );
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Coverage = table + FT_NEXT_USHORT( p );
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DeltaGlyphID = FT_NEXT_SHORT( p );
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otv_Coverage_validate( Coverage, valid, -1 );
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idx = otv_Coverage_get_first( Coverage ) + DeltaGlyphID;
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if ( idx < 0 )
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FT_INVALID_DATA;
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idx = otv_Coverage_get_last( Coverage ) + DeltaGlyphID;
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if ( (FT_UInt)idx >= valid->glyph_count )
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FT_INVALID_DATA;
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}
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break;
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case 2: /* SingleSubstFormat2 */
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{
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FT_UInt Coverage, GlyphCount;
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OTV_LIMIT_CHECK( 4 );
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Coverage = 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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otv_Coverage_validate( table + Coverage, valid, GlyphCount );
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OTV_LIMIT_CHECK( GlyphCount * 2 );
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/* Substitute */
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for ( ; GlyphCount > 0; GlyphCount-- )
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if ( FT_NEXT_USHORT( p ) >= valid->glyph_count )
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FT_INVALID_GLYPH_ID;
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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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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 2 *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* sets valid->extra1 (glyph count) */
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static void
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otv_MultipleSubst_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 SubstFormat;
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OTV_NAME_ENTER( "MultipleSubst" );
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OTV_LIMIT_CHECK( 2 );
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SubstFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", SubstFormat ));
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switch ( SubstFormat )
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{
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case 1:
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valid->extra1 = valid->glyph_count;
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OTV_NEST2( MultipleSubstFormat1, Sequence );
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OTV_RUN( table, valid );
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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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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 3 *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* sets valid->extra1 (glyph count) */
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static void
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otv_AlternateSubst_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 SubstFormat;
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OTV_NAME_ENTER( "AlternateSubst" );
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OTV_LIMIT_CHECK( 2 );
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SubstFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", SubstFormat ));
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switch ( SubstFormat )
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{
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case 1:
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valid->extra1 = valid->glyph_count;
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OTV_NEST2( AlternateSubstFormat1, AlternateSet );
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OTV_RUN( table, valid );
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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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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GSUB LOOKUP TYPE 4 *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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#define LigatureFunc otv_Ligature_validate
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/* uses valid->glyph_count */
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static void
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otv_Ligature_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 LigatureGlyph, CompCount;
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214 |
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OTV_ENTER;
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OTV_LIMIT_CHECK( 4 );
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LigatureGlyph = FT_NEXT_USHORT( p );
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if ( LigatureGlyph >= valid->glyph_count )
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FT_INVALID_DATA;
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CompCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (CompCount = %d)\n", CompCount ));
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if ( CompCount == 0 )
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FT_INVALID_DATA;
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CompCount--;
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OTV_LIMIT_CHECK( CompCount * 2 ); /* Component */
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232 |
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/* no need to check the Component glyph indices */
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OTV_EXIT;
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}
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static void
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otv_LigatureSubst_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 SubstFormat;
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245 |
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246 |
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OTV_NAME_ENTER( "LigatureSubst" );
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248 |
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OTV_LIMIT_CHECK( 2 );
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SubstFormat = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (format %d)\n", SubstFormat ));
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switch ( SubstFormat )
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{
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case 1:
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OTV_NEST3( LigatureSubstFormat1, LigatureSet, Ligature );
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OTV_RUN( table, valid );
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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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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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272 |
/***** GSUB LOOKUP TYPE 5 *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* sets valid->extra1 (lookup count) */
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static void
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otv_ContextSubst_validate( FT_Bytes table,
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281 |
OTV_Validator valid )
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{
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FT_Bytes p = table;
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FT_UInt SubstFormat;
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285 |
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286 |
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287 |
OTV_NAME_ENTER( "ContextSubst" );
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288 |
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OTV_LIMIT_CHECK( 2 );
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SubstFormat = FT_NEXT_USHORT( p );
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291 |
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OTV_TRACE(( " (format %d)\n", SubstFormat ));
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293 |
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switch ( SubstFormat )
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{
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case 1:
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/* no need to check glyph indices/classes used as input for these */
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/* context rules since even invalid glyph indices/classes return */
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299 |
/* meaningful results */
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300 |
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valid->extra1 = valid->lookup_count;
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302 |
OTV_NEST3( ContextSubstFormat1, SubRuleSet, SubRule );
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OTV_RUN( table, valid );
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304 |
break;
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305 |
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306 |
case 2:
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/* no need to check glyph indices/classes used as input for these */
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/* context rules since even invalid glyph indices/classes return */
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309 |
/* meaningful results */
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310 |
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311 |
OTV_NEST3( ContextSubstFormat2, SubClassSet, SubClassRule );
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312 |
OTV_RUN( table, valid );
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313 |
break;
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314 |
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315 |
case 3:
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316 |
OTV_NEST1( ContextSubstFormat3 );
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OTV_RUN( table, valid );
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318 |
break;
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319 |
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default:
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321 |
FT_INVALID_FORMAT;
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322 |
}
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323 |
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324 |
OTV_EXIT;
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325 |
}
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326 |
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327 |
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328 |
/*************************************************************************/
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329 |
/*************************************************************************/
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330 |
/***** *****/
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331 |
/***** GSUB LOOKUP TYPE 6 *****/
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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 |
/* sets valid->extra1 (lookup count) */
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337 |
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338 |
static void
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339 |
otv_ChainContextSubst_validate( FT_Bytes table,
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340 |
OTV_Validator valid )
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341 |
{
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342 |
FT_Bytes p = table;
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343 |
FT_UInt SubstFormat;
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344 |
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345 |
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346 |
OTV_NAME_ENTER( "ChainContextSubst" );
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347 |
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348 |
OTV_LIMIT_CHECK( 2 );
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349 |
SubstFormat = FT_NEXT_USHORT( p );
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350 |
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351 |
OTV_TRACE(( " (format %d)\n", SubstFormat ));
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352 |
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353 |
switch ( SubstFormat )
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354 |
{
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355 |
case 1:
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356 |
/* no need to check glyph indices/classes used as input for these */
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357 |
/* context rules since even invalid glyph indices/classes return */
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358 |
/* meaningful results */
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359 |
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360 |
valid->extra1 = valid->lookup_count;
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361 |
OTV_NEST3( ChainContextSubstFormat1,
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362 |
ChainSubRuleSet, ChainSubRule );
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363 |
OTV_RUN( table, valid );
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364 |
break;
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365 |
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366 |
case 2:
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367 |
/* no need to check glyph indices/classes used as input for these */
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368 |
/* context rules since even invalid glyph indices/classes return */
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369 |
/* meaningful results */
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370 |
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371 |
OTV_NEST3( ChainContextSubstFormat2,
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372 |
ChainSubClassSet, ChainSubClassRule );
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373 |
OTV_RUN( table, valid );
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374 |
break;
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375 |
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376 |
case 3:
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377 |
OTV_NEST1( ChainContextSubstFormat3 );
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378 |
OTV_RUN( table, valid );
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379 |
break;
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380 |
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381 |
default:
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382 |
FT_INVALID_FORMAT;
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383 |
}
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384 |
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385 |
OTV_EXIT;
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386 |
}
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387 |
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388 |
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389 |
/*************************************************************************/
|
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|
390 |
/*************************************************************************/
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|
391 |
/***** *****/
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|
392 |
/***** GSUB LOOKUP TYPE 7 *****/
|
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|
393 |
/***** *****/
|
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|
394 |
/*************************************************************************/
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395 |
/*************************************************************************/
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396 |
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|
397 |
/* uses valid->type_funcs */
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398 |
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|
399 |
static void
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|
400 |
otv_ExtensionSubst_validate( FT_Bytes table,
|
|
|
401 |
OTV_Validator valid )
|
|
|
402 |
{
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|
403 |
FT_Bytes p = table;
|
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|
404 |
FT_UInt SubstFormat;
|
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|
405 |
|
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406 |
|
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|
407 |
OTV_NAME_ENTER( "ExtensionSubst" );
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408 |
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|
409 |
OTV_LIMIT_CHECK( 2 );
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|
410 |
SubstFormat = FT_NEXT_USHORT( p );
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411 |
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|
|
412 |
OTV_TRACE(( " (format %d)\n", SubstFormat ));
|
|
|
413 |
|
|
|
414 |
switch ( SubstFormat )
|
|
|
415 |
{
|
|
|
416 |
case 1: /* ExtensionSubstFormat1 */
|
|
|
417 |
{
|
|
|
418 |
FT_UInt ExtensionLookupType;
|
|
|
419 |
FT_ULong ExtensionOffset;
|
|
|
420 |
OTV_Validate_Func validate;
|
|
|
421 |
|
|
|
422 |
|
|
|
423 |
OTV_LIMIT_CHECK( 6 );
|
|
|
424 |
ExtensionLookupType = FT_NEXT_USHORT( p );
|
|
|
425 |
ExtensionOffset = FT_NEXT_ULONG( p );
|
|
|
426 |
|
|
|
427 |
if ( ExtensionLookupType == 0 ||
|
|
|
428 |
ExtensionLookupType == 7 ||
|
|
|
429 |
ExtensionLookupType > 8 )
|
|
|
430 |
FT_INVALID_DATA;
|
|
|
431 |
|
|
|
432 |
validate = valid->type_funcs[ExtensionLookupType - 1];
|
|
|
433 |
validate( table + ExtensionOffset, valid );
|
|
|
434 |
}
|
|
|
435 |
break;
|
|
|
436 |
|
|
|
437 |
default:
|
|
|
438 |
FT_INVALID_FORMAT;
|
|
|
439 |
}
|
|
|
440 |
|
|
|
441 |
OTV_EXIT;
|
|
|
442 |
}
|
|
|
443 |
|
|
|
444 |
|
|
|
445 |
/*************************************************************************/
|
|
|
446 |
/*************************************************************************/
|
|
|
447 |
/***** *****/
|
|
|
448 |
/***** GSUB LOOKUP TYPE 8 *****/
|
|
|
449 |
/***** *****/
|
|
|
450 |
/*************************************************************************/
|
|
|
451 |
/*************************************************************************/
|
|
|
452 |
|
|
|
453 |
/* uses valid->glyph_count */
|
|
|
454 |
|
|
|
455 |
static void
|
|
|
456 |
otv_ReverseChainSingleSubst_validate( FT_Bytes table,
|
|
|
457 |
OTV_Validator valid )
|
|
|
458 |
{
|
|
|
459 |
FT_Bytes p = table, Coverage;
|
|
|
460 |
FT_UInt SubstFormat;
|
|
|
461 |
FT_UInt BacktrackGlyphCount, LookaheadGlyphCount, GlyphCount;
|
|
|
462 |
|
|
|
463 |
|
|
|
464 |
OTV_NAME_ENTER( "ReverseChainSingleSubst" );
|
|
|
465 |
|
|
|
466 |
OTV_LIMIT_CHECK( 2 );
|
|
|
467 |
SubstFormat = FT_NEXT_USHORT( p );
|
|
|
468 |
|
|
|
469 |
OTV_TRACE(( " (format %d)\n", SubstFormat ));
|
|
|
470 |
|
|
|
471 |
switch ( SubstFormat )
|
|
|
472 |
{
|
|
|
473 |
case 1: /* ReverseChainSingleSubstFormat1 */
|
|
|
474 |
OTV_LIMIT_CHECK( 4 );
|
|
|
475 |
Coverage = table + FT_NEXT_USHORT( p );
|
|
|
476 |
BacktrackGlyphCount = FT_NEXT_USHORT( p );
|
|
|
477 |
|
|
|
478 |
OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount ));
|
|
|
479 |
|
|
|
480 |
otv_Coverage_validate( Coverage, valid, -1 );
|
|
|
481 |
|
|
|
482 |
OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 );
|
|
|
483 |
|
|
|
484 |
for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- )
|
|
|
485 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
486 |
|
|
|
487 |
LookaheadGlyphCount = FT_NEXT_USHORT( p );
|
|
|
488 |
|
|
|
489 |
OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount ));
|
|
|
490 |
|
|
|
491 |
OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 );
|
|
|
492 |
|
|
|
493 |
for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- )
|
|
|
494 |
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 );
|
|
|
495 |
|
|
|
496 |
GlyphCount = FT_NEXT_USHORT( p );
|
|
|
497 |
|
|
|
498 |
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
|
|
|
499 |
|
|
|
500 |
if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
|
|
|
501 |
FT_INVALID_DATA;
|
|
|
502 |
|
|
|
503 |
OTV_LIMIT_CHECK( GlyphCount * 2 );
|
|
|
504 |
|
|
|
505 |
/* Substitute */
|
|
|
506 |
for ( ; GlyphCount > 0; GlyphCount-- )
|
|
|
507 |
if ( FT_NEXT_USHORT( p ) >= valid->glyph_count )
|
|
|
508 |
FT_INVALID_DATA;
|
|
|
509 |
|
|
|
510 |
break;
|
|
|
511 |
|
|
|
512 |
default:
|
|
|
513 |
FT_INVALID_FORMAT;
|
|
|
514 |
}
|
|
|
515 |
|
|
|
516 |
OTV_EXIT;
|
|
|
517 |
}
|
|
|
518 |
|
|
|
519 |
|
|
|
520 |
static const OTV_Validate_Func otv_gsub_validate_funcs[8] =
|
|
|
521 |
{
|
|
|
522 |
otv_SingleSubst_validate,
|
|
|
523 |
otv_MultipleSubst_validate,
|
|
|
524 |
otv_AlternateSubst_validate,
|
|
|
525 |
otv_LigatureSubst_validate,
|
|
|
526 |
otv_ContextSubst_validate,
|
|
|
527 |
otv_ChainContextSubst_validate,
|
|
|
528 |
otv_ExtensionSubst_validate,
|
|
|
529 |
otv_ReverseChainSingleSubst_validate
|
|
|
530 |
};
|
|
|
531 |
|
|
|
532 |
|
|
|
533 |
/*************************************************************************/
|
|
|
534 |
/*************************************************************************/
|
|
|
535 |
/***** *****/
|
|
|
536 |
/***** GSUB TABLE *****/
|
|
|
537 |
/***** *****/
|
|
|
538 |
/*************************************************************************/
|
|
|
539 |
/*************************************************************************/
|
|
|
540 |
|
|
|
541 |
/* sets valid->type_count */
|
|
|
542 |
/* sets valid->type_funcs */
|
|
|
543 |
/* sets valid->glyph_count */
|
|
|
544 |
|
|
|
545 |
FT_LOCAL_DEF( void )
|
|
|
546 |
otv_GSUB_validate( FT_Bytes table,
|
|
|
547 |
FT_UInt glyph_count,
|
|
|
548 |
FT_Validator ftvalid )
|
|
|
549 |
{
|
|
|
550 |
OTV_ValidatorRec validrec;
|
|
|
551 |
OTV_Validator valid = &validrec;
|
|
|
552 |
FT_Bytes p = table;
|
|
|
553 |
FT_UInt ScriptList, FeatureList, LookupList;
|
|
|
554 |
|
|
|
555 |
|
|
|
556 |
valid->root = ftvalid;
|
|
|
557 |
|
|
|
558 |
FT_TRACE3(( "validating GSUB table\n" ));
|
|
|
559 |
OTV_INIT;
|
|
|
560 |
|
|
|
561 |
OTV_LIMIT_CHECK( 10 );
|
|
|
562 |
|
|
|
563 |
if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
|
|
|
564 |
FT_INVALID_FORMAT;
|
|
|
565 |
|
|
|
566 |
ScriptList = FT_NEXT_USHORT( p );
|
|
|
567 |
FeatureList = FT_NEXT_USHORT( p );
|
|
|
568 |
LookupList = FT_NEXT_USHORT( p );
|
|
|
569 |
|
|
|
570 |
valid->type_count = 8;
|
|
|
571 |
valid->type_funcs = (OTV_Validate_Func*)otv_gsub_validate_funcs;
|
|
|
572 |
valid->glyph_count = glyph_count;
|
|
|
573 |
|
|
|
574 |
otv_LookupList_validate( table + LookupList,
|
|
|
575 |
valid );
|
|
|
576 |
otv_FeatureList_validate( table + FeatureList, table + LookupList,
|
|
|
577 |
valid );
|
|
|
578 |
otv_ScriptList_validate( table + ScriptList, table + FeatureList,
|
|
|
579 |
valid );
|
|
|
580 |
|
|
|
581 |
FT_TRACE4(( "\n" ));
|
|
|
582 |
}
|
|
|
583 |
|
|
|
584 |
|
|
|
585 |
/* END */
|