| /***************************************************************************/ |
| /* */ |
| /* otvjstf.c */ |
| /* */ |
| /* OpenType JSTF table validation (body). */ |
| /* */ |
| /* Copyright 2004-2015 by */ |
| /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
| /* */ |
| /* This file is part of the FreeType project, and may only be used, */ |
| /* modified, and distributed under the terms of the FreeType project */ |
| /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
| /* this file you indicate that you have read the license and */ |
| /* understand and accept it fully. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| #include "otvalid.h" |
| #include "otvcommn.h" |
| #include "otvgpos.h" |
| |
| |
| /*************************************************************************/ |
| /* */ |
| /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| /* messages during execution. */ |
| /* */ |
| #undef FT_COMPONENT |
| #define FT_COMPONENT trace_otvjstf |
| |
| |
| #define JstfPriorityFunc otv_JstfPriority_validate |
| #define JstfLookupFunc otv_GPOS_subtable_validate |
| |
| /* uses otvalid->extra1 (GSUB lookup count) */ |
| /* uses otvalid->extra2 (GPOS lookup count) */ |
| /* sets otvalid->extra1 (counter) */ |
| |
| static void |
| otv_JstfPriority_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt table_size; |
| FT_UInt gsub_lookup_count, gpos_lookup_count; |
| |
| OTV_OPTIONAL_TABLE( ShrinkageEnableGSUB ); |
| OTV_OPTIONAL_TABLE( ShrinkageDisableGSUB ); |
| OTV_OPTIONAL_TABLE( ShrinkageEnableGPOS ); |
| OTV_OPTIONAL_TABLE( ShrinkageDisableGPOS ); |
| OTV_OPTIONAL_TABLE( ExtensionEnableGSUB ); |
| OTV_OPTIONAL_TABLE( ExtensionDisableGSUB ); |
| OTV_OPTIONAL_TABLE( ExtensionEnableGPOS ); |
| OTV_OPTIONAL_TABLE( ExtensionDisableGPOS ); |
| OTV_OPTIONAL_TABLE( ShrinkageJstfMax ); |
| OTV_OPTIONAL_TABLE( ExtensionJstfMax ); |
| |
| |
| OTV_ENTER; |
| OTV_TRACE(( "JstfPriority table\n" )); |
| |
| OTV_LIMIT_CHECK( 20 ); |
| |
| gsub_lookup_count = otvalid->extra1; |
| gpos_lookup_count = otvalid->extra2; |
| |
| table_size = 20; |
| |
| otvalid->extra1 = gsub_lookup_count; |
| |
| OTV_OPTIONAL_OFFSET( ShrinkageEnableGSUB ); |
| OTV_SIZE_CHECK( ShrinkageEnableGSUB ); |
| if ( ShrinkageEnableGSUB ) |
| otv_x_ux( table + ShrinkageEnableGSUB, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ShrinkageDisableGSUB ); |
| OTV_SIZE_CHECK( ShrinkageDisableGSUB ); |
| if ( ShrinkageDisableGSUB ) |
| otv_x_ux( table + ShrinkageDisableGSUB, otvalid ); |
| |
| otvalid->extra1 = gpos_lookup_count; |
| |
| OTV_OPTIONAL_OFFSET( ShrinkageEnableGPOS ); |
| OTV_SIZE_CHECK( ShrinkageEnableGPOS ); |
| if ( ShrinkageEnableGPOS ) |
| otv_x_ux( table + ShrinkageEnableGPOS, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ShrinkageDisableGPOS ); |
| OTV_SIZE_CHECK( ShrinkageDisableGPOS ); |
| if ( ShrinkageDisableGPOS ) |
| otv_x_ux( table + ShrinkageDisableGPOS, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ShrinkageJstfMax ); |
| OTV_SIZE_CHECK( ShrinkageJstfMax ); |
| if ( ShrinkageJstfMax ) |
| { |
| /* XXX: check lookup types? */ |
| OTV_NEST2( JstfMax, JstfLookup ); |
| OTV_RUN( table + ShrinkageJstfMax, otvalid ); |
| } |
| |
| otvalid->extra1 = gsub_lookup_count; |
| |
| OTV_OPTIONAL_OFFSET( ExtensionEnableGSUB ); |
| OTV_SIZE_CHECK( ExtensionEnableGSUB ); |
| if ( ExtensionEnableGSUB ) |
| otv_x_ux( table + ExtensionEnableGSUB, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ExtensionDisableGSUB ); |
| OTV_SIZE_CHECK( ExtensionDisableGSUB ); |
| if ( ExtensionDisableGSUB ) |
| otv_x_ux( table + ExtensionDisableGSUB, otvalid ); |
| |
| otvalid->extra1 = gpos_lookup_count; |
| |
| OTV_OPTIONAL_OFFSET( ExtensionEnableGPOS ); |
| OTV_SIZE_CHECK( ExtensionEnableGPOS ); |
| if ( ExtensionEnableGPOS ) |
| otv_x_ux( table + ExtensionEnableGPOS, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ExtensionDisableGPOS ); |
| OTV_SIZE_CHECK( ExtensionDisableGPOS ); |
| if ( ExtensionDisableGPOS ) |
| otv_x_ux( table + ExtensionDisableGPOS, otvalid ); |
| |
| OTV_OPTIONAL_OFFSET( ExtensionJstfMax ); |
| OTV_SIZE_CHECK( ExtensionJstfMax ); |
| if ( ExtensionJstfMax ) |
| { |
| /* XXX: check lookup types? */ |
| OTV_NEST2( JstfMax, JstfLookup ); |
| OTV_RUN( table + ExtensionJstfMax, otvalid ); |
| } |
| |
| otvalid->extra1 = gsub_lookup_count; |
| otvalid->extra2 = gpos_lookup_count; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra (glyph count) */ |
| /* sets otvalid->func1 (otv_JstfPriority_validate) */ |
| |
| static void |
| otv_JstfScript_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt table_size; |
| FT_UInt JstfLangSysCount; |
| |
| OTV_OPTIONAL_TABLE( ExtGlyph ); |
| OTV_OPTIONAL_TABLE( DefJstfLangSys ); |
| |
| |
| OTV_NAME_ENTER( "JstfScript" ); |
| |
| OTV_LIMIT_CHECK( 6 ); |
| OTV_OPTIONAL_OFFSET( ExtGlyph ); |
| OTV_OPTIONAL_OFFSET( DefJstfLangSys ); |
| JstfLangSysCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount )); |
| |
| table_size = JstfLangSysCount * 6 + 6; |
| |
| OTV_SIZE_CHECK( ExtGlyph ); |
| if ( ExtGlyph ) |
| { |
| otvalid->extra1 = otvalid->glyph_count; |
| OTV_NEST1( ExtenderGlyph ); |
| OTV_RUN( table + ExtGlyph, otvalid ); |
| } |
| |
| OTV_SIZE_CHECK( DefJstfLangSys ); |
| if ( DefJstfLangSys ) |
| { |
| OTV_NEST2( JstfLangSys, JstfPriority ); |
| OTV_RUN( table + DefJstfLangSys, otvalid ); |
| } |
| |
| OTV_LIMIT_CHECK( 6 * JstfLangSysCount ); |
| |
| /* JstfLangSysRecord */ |
| OTV_NEST2( JstfLangSys, JstfPriority ); |
| for ( ; JstfLangSysCount > 0; JstfLangSysCount-- ) |
| { |
| p += 4; /* skip JstfLangSysTag */ |
| |
| OTV_RUN( table + FT_NEXT_USHORT( p ), otvalid ); |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra1 (GSUB lookup count) */ |
| /* sets otvalid->extra2 (GPOS lookup count) */ |
| /* sets otvalid->glyph_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_JSTF_validate( FT_Bytes table, |
| FT_Bytes gsub, |
| FT_Bytes gpos, |
| FT_UInt glyph_count, |
| FT_Validator ftvalid ) |
| { |
| OTV_ValidatorRec otvalidrec; |
| OTV_Validator otvalid = &otvalidrec; |
| FT_Bytes p = table; |
| FT_UInt JstfScriptCount; |
| |
| |
| otvalid->root = ftvalid; |
| |
| |
| FT_TRACE3(( "validating JSTF table\n" )); |
| OTV_INIT; |
| |
| OTV_LIMIT_CHECK( 6 ); |
| |
| if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
| FT_INVALID_FORMAT; |
| |
| JstfScriptCount = FT_NEXT_USHORT( p ); |
| |
| FT_TRACE3(( " (JstfScriptCount = %d)\n", JstfScriptCount )); |
| |
| OTV_LIMIT_CHECK( JstfScriptCount * 6 ); |
| |
| if ( gsub ) |
| otvalid->extra1 = otv_GSUBGPOS_get_Lookup_count( gsub ); |
| else |
| otvalid->extra1 = 0; |
| |
| if ( gpos ) |
| otvalid->extra2 = otv_GSUBGPOS_get_Lookup_count( gpos ); |
| else |
| otvalid->extra2 = 0; |
| |
| otvalid->glyph_count = glyph_count; |
| |
| /* JstfScriptRecord */ |
| for ( ; JstfScriptCount > 0; JstfScriptCount-- ) |
| { |
| p += 4; /* skip JstfScriptTag */ |
| |
| /* JstfScript */ |
| otv_JstfScript_validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| } |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| /* END */ |