forked from minhngoc25a/freetype2
259 lines
7.8 KiB
C
259 lines
7.8 KiB
C
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/***************************************************************************/
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/* */
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/* otvjstf.c */
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/* */
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/* OpenType JSTF table validation (body). */
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/* */
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/* Copyright 2004 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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#include "otvgpos.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_otvjstf
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#define JstfPriority otv_JstfPriority_validate, "JstfPriority"
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#define JstfLookup otv_GPOS_subtable_validate, ""
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/* uses valid->extra1 (GSUB lookup count) */
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/* uses valid->extra2 (GPOS lookup count) */
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/* sets valid->extra1 (counter) */
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static void
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otv_JstfPriority_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 table_size;
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FT_UInt gsub_lookup_count, gpos_lookup_count;
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OTV_OPTIONAL_TABLE( ShrinkageEnableGSUB );
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OTV_OPTIONAL_TABLE( ShrinkageDisableGSUB );
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OTV_OPTIONAL_TABLE( ShrinkageEnableGPOS );
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OTV_OPTIONAL_TABLE( ShrinkageDisableGPOS );
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OTV_OPTIONAL_TABLE( ExtensionEnableGSUB );
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OTV_OPTIONAL_TABLE( ExtensionDisableGSUB );
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OTV_OPTIONAL_TABLE( ExtensionEnableGPOS );
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OTV_OPTIONAL_TABLE( ExtensionDisableGPOS );
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OTV_OPTIONAL_TABLE( ShrinkageJstfMax );
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OTV_OPTIONAL_TABLE( ExtensionJstfMax );
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OTV_ENTER;
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OTV_TRACE(( "JstfPriority table\n" ));
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OTV_LIMIT_CHECK( 20 );
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gsub_lookup_count = valid->extra1;
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gpos_lookup_count = valid->extra2;
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table_size = 20;
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valid->extra1 = gsub_lookup_count;
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OTV_OPTIONAL_OFFSET( ShrinkageEnableGSUB );
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OTV_SIZE_CHECK( ShrinkageEnableGSUB );
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if ( ShrinkageEnableGSUB )
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otv_x_ux( table + ShrinkageEnableGSUB, valid );
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OTV_OPTIONAL_OFFSET( ShrinkageDisableGSUB );
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OTV_SIZE_CHECK( ShrinkageDisableGSUB );
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if ( ShrinkageDisableGSUB )
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otv_x_ux( table + ShrinkageDisableGSUB, valid );
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valid->extra1 = gpos_lookup_count;
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OTV_OPTIONAL_OFFSET( ShrinkageEnableGPOS );
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OTV_SIZE_CHECK( ShrinkageEnableGPOS );
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if ( ShrinkageEnableGPOS )
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otv_x_ux( table + ShrinkageEnableGPOS, valid );
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OTV_OPTIONAL_OFFSET( ShrinkageDisableGPOS );
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OTV_SIZE_CHECK( ShrinkageDisableGPOS );
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if ( ShrinkageDisableGPOS )
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otv_x_ux( table + ShrinkageDisableGPOS, valid );
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OTV_OPTIONAL_OFFSET( ShrinkageJstfMax );
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OTV_SIZE_CHECK( ShrinkageJstfMax );
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if ( ShrinkageJstfMax )
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{
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/* XXX: check lookup types? */
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OTV_NEST2( JstfMax, JstfLookup );
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OTV_RUN( table + ShrinkageJstfMax, valid );
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}
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valid->extra1 = gsub_lookup_count;
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OTV_OPTIONAL_OFFSET( ExtensionEnableGSUB );
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OTV_SIZE_CHECK( ExtensionEnableGSUB );
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if ( ExtensionEnableGSUB )
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otv_x_ux( table + ExtensionEnableGSUB, valid );
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OTV_OPTIONAL_OFFSET( ExtensionDisableGSUB );
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OTV_SIZE_CHECK( ExtensionDisableGSUB );
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if ( ExtensionDisableGSUB )
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otv_x_ux( table + ExtensionDisableGSUB, valid );
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valid->extra1 = gpos_lookup_count;
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OTV_OPTIONAL_OFFSET( ExtensionEnableGPOS );
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OTV_SIZE_CHECK( ExtensionEnableGPOS );
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if ( ExtensionEnableGPOS )
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otv_x_ux( table + ExtensionEnableGPOS, valid );
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OTV_OPTIONAL_OFFSET( ExtensionDisableGPOS );
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OTV_SIZE_CHECK( ExtensionDisableGPOS );
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if ( ExtensionDisableGPOS )
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otv_x_ux( table + ExtensionDisableGPOS, valid );
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OTV_OPTIONAL_OFFSET( ExtensionJstfMax );
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OTV_SIZE_CHECK( ExtensionJstfMax );
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if ( ExtensionJstfMax )
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{
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/* XXX: check lookup types? */
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OTV_NEST2( JstfMax, JstfLookup );
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OTV_RUN( table + ExtensionJstfMax, valid );
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}
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valid->extra1 = gsub_lookup_count;
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valid->extra2 = gpos_lookup_count;
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OTV_EXIT;
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}
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/* sets valid->extra (glyph count) */
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/* sets valid->func1 (otv_JstfPriority_validate) */
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static void
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otv_JstfScript_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 table_size;
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FT_UInt JstfLangSysCount;
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OTV_OPTIONAL_TABLE( ExtGlyph );
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OTV_OPTIONAL_TABLE( DefJstfLangSys );
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OTV_NAME_ENTER( "JstfScript" );
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OTV_LIMIT_CHECK( 6 );
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OTV_OPTIONAL_OFFSET( ExtGlyph );
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OTV_OPTIONAL_OFFSET( DefJstfLangSys );
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JstfLangSysCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount ));
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table_size = JstfLangSysCount * 6 + 6;
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OTV_SIZE_CHECK( ExtGlyph );
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if ( ExtGlyph )
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{
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valid->extra1 = valid->glyph_count;
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OTV_NEST1( ExtenderGlyph );
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OTV_RUN( table + ExtGlyph, valid );
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}
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OTV_SIZE_CHECK( DefJstfLangSys );
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if ( DefJstfLangSys )
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{
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OTV_NEST2( JstfLangSys, JstfPriority );
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OTV_RUN( table + DefJstfLangSys, valid );
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}
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OTV_LIMIT_CHECK( 6 * JstfLangSysCount );
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/* JstfLangSysRecord */
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OTV_NEST2( JstfLangSys, JstfPriority );
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for ( ; JstfLangSysCount > 0; JstfLangSysCount-- )
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{
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p += 4; /* skip JstfLangSysTag */
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OTV_RUN( table + FT_NEXT_USHORT( p ), valid );
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}
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OTV_EXIT;
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}
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/* sets valid->extra1 (GSUB lookup count) */
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/* sets valid->extra2 (GPOS lookup count) */
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/* sets valid->glyph_count */
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FT_LOCAL_DEF( void )
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otv_JSTF_validate( FT_Bytes table,
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FT_Bytes gsub,
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FT_Bytes gpos,
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FT_UInt glyph_count,
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FT_Validator ftvalid )
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{
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OTV_ValidatorRec validrec;
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OTV_Validator valid = &validrec;
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FT_Bytes p = table;
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FT_UInt JstfScriptCount;
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valid->root = ftvalid;
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FT_TRACE3(( "validating JSTF table\n" ));
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OTV_INIT;
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OTV_LIMIT_CHECK( 6 );
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if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
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FT_INVALID_DATA;
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JstfScriptCount = FT_NEXT_USHORT( p );
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FT_TRACE3(( " (JstfScriptCount = %d)\n", JstfScriptCount ));
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OTV_LIMIT_CHECK( JstfScriptCount * 6 );
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if ( gsub )
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valid->extra1 = otv_GSUBGPOS_get_Lookup_count( gsub );
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else
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valid->extra1 = 0;
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if ( gpos )
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valid->extra2 = otv_GSUBGPOS_get_Lookup_count( gpos );
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else
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valid->extra2 = 0;
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valid->glyph_count = glyph_count;
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/* JstfScriptRecord */
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for ( ; JstfScriptCount > 0; JstfScriptCount-- )
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{
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p += 4; /* skip JstfScriptTag */
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/* JstfScript */
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otv_JstfScript_validate( table + FT_NEXT_USHORT( p ), valid );
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}
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FT_TRACE4(( "\n" ));
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}
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/* END */
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