| /**************************************************************************** |
| * |
| * otvcommn.c |
| * |
| * OpenType common tables validation (body). |
| * |
| * Copyright (C) 2004-2021 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 "otvcommn.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 otvcommon |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** COVERAGE TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| otv_Coverage_validate( FT_Bytes table, |
| OTV_Validator otvalid, |
| FT_Int expected_count ) |
| { |
| FT_Bytes p = table; |
| FT_UInt CoverageFormat; |
| FT_UInt total = 0; |
| |
| |
| OTV_NAME_ENTER( "Coverage" ); |
| |
| OTV_LIMIT_CHECK( 4 ); |
| CoverageFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", CoverageFormat )); |
| |
| switch ( CoverageFormat ) |
| { |
| case 1: /* CoverageFormat1 */ |
| { |
| FT_UInt GlyphCount; |
| FT_UInt i; |
| |
| |
| GlyphCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| |
| OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */ |
| |
| for ( i = 0; i < GlyphCount; i++ ) |
| { |
| FT_UInt gid; |
| |
| |
| gid = FT_NEXT_USHORT( p ); |
| if ( gid >= otvalid->glyph_count ) |
| FT_INVALID_GLYPH_ID; |
| } |
| |
| total = GlyphCount; |
| } |
| break; |
| |
| case 2: /* CoverageFormat2 */ |
| { |
| FT_UInt n, RangeCount; |
| FT_UInt Start, End, StartCoverageIndex, last = 0; |
| |
| |
| RangeCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (RangeCount = %d)\n", RangeCount )); |
| |
| OTV_LIMIT_CHECK( RangeCount * 6 ); |
| |
| /* RangeRecord */ |
| for ( n = 0; n < RangeCount; n++ ) |
| { |
| Start = FT_NEXT_USHORT( p ); |
| End = FT_NEXT_USHORT( p ); |
| StartCoverageIndex = FT_NEXT_USHORT( p ); |
| |
| if ( Start > End || StartCoverageIndex != total ) |
| FT_INVALID_DATA; |
| |
| if ( End >= otvalid->glyph_count ) |
| FT_INVALID_GLYPH_ID; |
| |
| if ( n > 0 && Start <= last ) |
| FT_INVALID_DATA; |
| |
| total += End - Start + 1; |
| last = End; |
| } |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| /* Generally, a coverage table offset has an associated count field. */ |
| /* The number of glyphs in the table should match this field. If */ |
| /* there is no associated count, a value of -1 tells us not to check. */ |
| if ( expected_count != -1 && (FT_UInt)expected_count != total ) |
| FT_INVALID_DATA; |
| |
| OTV_EXIT; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| otv_Coverage_get_first( FT_Bytes table ) |
| { |
| FT_Bytes p = table; |
| |
| |
| p += 4; /* skip CoverageFormat and Glyph/RangeCount */ |
| |
| return FT_NEXT_USHORT( p ); |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| otv_Coverage_get_last( FT_Bytes table ) |
| { |
| FT_Bytes p = table; |
| FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
| FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
| FT_UInt result = 0; |
| |
| |
| if ( !count ) |
| return result; |
| |
| switch ( CoverageFormat ) |
| { |
| case 1: |
| p += ( count - 1 ) * 2; |
| result = FT_NEXT_USHORT( p ); |
| break; |
| |
| case 2: |
| p += ( count - 1 ) * 6 + 2; |
| result = FT_NEXT_USHORT( p ); |
| break; |
| |
| default: |
| ; |
| } |
| |
| return result; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| otv_Coverage_get_count( FT_Bytes table ) |
| { |
| FT_Bytes p = table; |
| FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
| FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
| FT_UInt result = 0; |
| |
| |
| switch ( CoverageFormat ) |
| { |
| case 1: |
| return count; |
| |
| case 2: |
| { |
| FT_UInt Start, End; |
| |
| |
| for ( ; count > 0; count-- ) |
| { |
| Start = FT_NEXT_USHORT( p ); |
| End = FT_NEXT_USHORT( p ); |
| p += 2; /* skip StartCoverageIndex */ |
| |
| result += End - Start + 1; |
| } |
| } |
| break; |
| |
| default: |
| ; |
| } |
| |
| return result; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** CLASS DEFINITION TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| otv_ClassDef_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt ClassFormat; |
| |
| |
| OTV_NAME_ENTER( "ClassDef" ); |
| |
| OTV_LIMIT_CHECK( 4 ); |
| ClassFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", ClassFormat )); |
| |
| switch ( ClassFormat ) |
| { |
| case 1: /* ClassDefFormat1 */ |
| { |
| FT_UInt StartGlyph; |
| FT_UInt GlyphCount; |
| |
| |
| OTV_LIMIT_CHECK( 4 ); |
| |
| StartGlyph = FT_NEXT_USHORT( p ); |
| GlyphCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| |
| OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */ |
| |
| if ( StartGlyph + GlyphCount - 1 >= otvalid->glyph_count ) |
| FT_INVALID_GLYPH_ID; |
| } |
| break; |
| |
| case 2: /* ClassDefFormat2 */ |
| { |
| FT_UInt n, ClassRangeCount; |
| FT_UInt Start, End, last = 0; |
| |
| |
| ClassRangeCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ClassRangeCount = %d)\n", ClassRangeCount )); |
| |
| OTV_LIMIT_CHECK( ClassRangeCount * 6 ); |
| |
| /* ClassRangeRecord */ |
| for ( n = 0; n < ClassRangeCount; n++ ) |
| { |
| Start = FT_NEXT_USHORT( p ); |
| End = FT_NEXT_USHORT( p ); |
| p += 2; /* skip Class */ |
| |
| if ( Start > End || ( n > 0 && Start <= last ) ) |
| FT_INVALID_DATA; |
| |
| if ( End >= otvalid->glyph_count ) |
| FT_INVALID_GLYPH_ID; |
| |
| last = End; |
| } |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| /* no need to check glyph indices used as input to class definition */ |
| /* tables since even invalid glyph indices return a meaningful result */ |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** DEVICE TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| otv_Device_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt StartSize, EndSize, DeltaFormat, count; |
| |
| |
| OTV_NAME_ENTER( "Device" ); |
| |
| OTV_LIMIT_CHECK( 6 ); |
| StartSize = FT_NEXT_USHORT( p ); |
| EndSize = FT_NEXT_USHORT( p ); |
| DeltaFormat = FT_NEXT_USHORT( p ); |
| |
| if ( DeltaFormat == 0x8000U ) |
| { |
| /* VariationIndex, nothing to do */ |
| } |
| else |
| { |
| if ( DeltaFormat < 1 || DeltaFormat > 3 ) |
| FT_INVALID_FORMAT; |
| |
| if ( EndSize < StartSize ) |
| FT_INVALID_DATA; |
| |
| count = EndSize - StartSize + 1; |
| OTV_LIMIT_CHECK( ( 1 << DeltaFormat ) * count / 8 ); /* DeltaValue */ |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** LOOKUPS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* uses otvalid->type_count */ |
| /* uses otvalid->type_funcs */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_Lookup_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt LookupType, LookupFlag, SubTableCount; |
| OTV_Validate_Func validate; |
| |
| |
| OTV_NAME_ENTER( "Lookup" ); |
| |
| OTV_LIMIT_CHECK( 6 ); |
| LookupType = FT_NEXT_USHORT( p ); |
| LookupFlag = FT_NEXT_USHORT( p ); |
| SubTableCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (type %d)\n", LookupType )); |
| |
| if ( LookupType == 0 || LookupType > otvalid->type_count ) |
| FT_INVALID_DATA; |
| |
| validate = otvalid->type_funcs[LookupType - 1]; |
| |
| OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount )); |
| |
| OTV_LIMIT_CHECK( SubTableCount * 2 ); |
| |
| /* SubTable */ |
| for ( ; SubTableCount > 0; SubTableCount-- ) |
| validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| |
| if ( LookupFlag & 0x10 ) |
| OTV_LIMIT_CHECK( 2 ); /* MarkFilteringSet */ |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* uses valid->lookup_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_LookupList_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt LookupCount; |
| |
| |
| OTV_NAME_ENTER( "LookupList" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| LookupCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
| |
| OTV_LIMIT_CHECK( LookupCount * 2 ); |
| |
| otvalid->lookup_count = LookupCount; |
| |
| /* Lookup */ |
| for ( ; LookupCount > 0; LookupCount-- ) |
| otv_Lookup_validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| |
| OTV_EXIT; |
| } |
| |
| |
| static FT_UInt |
| otv_LookupList_get_count( FT_Bytes table ) |
| { |
| return FT_NEXT_USHORT( table ); |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** FEATURES *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* uses otvalid->lookup_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_Feature_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt LookupCount; |
| |
| |
| OTV_NAME_ENTER( "Feature" ); |
| |
| OTV_LIMIT_CHECK( 4 ); |
| p += 2; /* skip FeatureParams (unused) */ |
| LookupCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
| |
| OTV_LIMIT_CHECK( LookupCount * 2 ); |
| |
| /* LookupListIndex */ |
| for ( ; LookupCount > 0; LookupCount-- ) |
| if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count ) |
| FT_INVALID_DATA; |
| |
| OTV_EXIT; |
| } |
| |
| |
| static FT_UInt |
| otv_Feature_get_count( FT_Bytes table ) |
| { |
| return FT_NEXT_USHORT( table ); |
| } |
| |
| |
| /* sets otvalid->lookup_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_FeatureList_validate( FT_Bytes table, |
| FT_Bytes lookups, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt FeatureCount; |
| |
| |
| OTV_NAME_ENTER( "FeatureList" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| FeatureCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
| |
| OTV_LIMIT_CHECK( FeatureCount * 2 ); |
| |
| otvalid->lookup_count = otv_LookupList_get_count( lookups ); |
| |
| /* FeatureRecord */ |
| for ( ; FeatureCount > 0; FeatureCount-- ) |
| { |
| p += 4; /* skip FeatureTag */ |
| |
| /* Feature */ |
| otv_Feature_validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** LANGUAGE SYSTEM *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| /* uses otvalid->extra1 (number of features) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_LangSys_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt ReqFeatureIndex; |
| FT_UInt FeatureCount; |
| |
| |
| OTV_NAME_ENTER( "LangSys" ); |
| |
| OTV_LIMIT_CHECK( 6 ); |
| p += 2; /* skip LookupOrder (unused) */ |
| ReqFeatureIndex = FT_NEXT_USHORT( p ); |
| FeatureCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ReqFeatureIndex = %d)\n", ReqFeatureIndex )); |
| OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
| |
| if ( ReqFeatureIndex != 0xFFFFU && ReqFeatureIndex >= otvalid->extra1 ) |
| FT_INVALID_DATA; |
| |
| OTV_LIMIT_CHECK( FeatureCount * 2 ); |
| |
| /* FeatureIndex */ |
| for ( ; FeatureCount > 0; FeatureCount-- ) |
| if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 ) |
| FT_INVALID_DATA; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** SCRIPTS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| FT_LOCAL_DEF( void ) |
| otv_Script_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_UInt DefaultLangSys, LangSysCount; |
| FT_Bytes p = table; |
| |
| |
| OTV_NAME_ENTER( "Script" ); |
| |
| OTV_LIMIT_CHECK( 4 ); |
| DefaultLangSys = FT_NEXT_USHORT( p ); |
| LangSysCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (LangSysCount = %d)\n", LangSysCount )); |
| |
| if ( DefaultLangSys != 0 ) |
| otv_LangSys_validate( table + DefaultLangSys, otvalid ); |
| |
| OTV_LIMIT_CHECK( LangSysCount * 6 ); |
| |
| /* LangSysRecord */ |
| for ( ; LangSysCount > 0; LangSysCount-- ) |
| { |
| p += 4; /* skip LangSysTag */ |
| |
| /* LangSys */ |
| otv_LangSys_validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra1 (number of features) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_ScriptList_validate( FT_Bytes table, |
| FT_Bytes features, |
| OTV_Validator otvalid ) |
| { |
| FT_UInt ScriptCount; |
| FT_Bytes p = table; |
| |
| |
| OTV_NAME_ENTER( "ScriptList" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| ScriptCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount )); |
| |
| OTV_LIMIT_CHECK( ScriptCount * 6 ); |
| |
| otvalid->extra1 = otv_Feature_get_count( features ); |
| |
| /* ScriptRecord */ |
| for ( ; ScriptCount > 0; ScriptCount-- ) |
| { |
| p += 4; /* skip ScriptTag */ |
| |
| otv_Script_validate( table + FT_NEXT_USHORT( p ), otvalid ); /* Script */ |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** UTILITY FUNCTIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* |
| u: uint16 |
| ux: unit16 [x] |
| |
| s: struct |
| sx: struct [x] |
| sxy: struct [x], using external y count |
| |
| x: uint16 x |
| |
| C: Coverage |
| |
| O: Offset |
| On: Offset (NULL) |
| Ox: Offset [x] |
| Onx: Offset (NULL) [x] |
| */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_x_Ox( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Count; |
| OTV_Validate_Func func; |
| |
| |
| OTV_ENTER; |
| |
| OTV_LIMIT_CHECK( 2 ); |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| OTV_LIMIT_CHECK( Count * 2 ); |
| |
| otvalid->nesting_level++; |
| func = otvalid->func[otvalid->nesting_level]; |
| |
| for ( ; Count > 0; Count-- ) |
| func( table + FT_NEXT_USHORT( p ), otvalid ); |
| |
| otvalid->nesting_level--; |
| |
| OTV_EXIT; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| otv_u_C_x_Ox( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Count, Coverage; |
| OTV_Validate_Func func; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip Format */ |
| |
| OTV_LIMIT_CHECK( 4 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, (FT_Int)Count ); |
| |
| OTV_LIMIT_CHECK( Count * 2 ); |
| |
| otvalid->nesting_level++; |
| func = otvalid->func[otvalid->nesting_level]; |
| |
| for ( ; Count > 0; Count-- ) |
| func( table + FT_NEXT_USHORT( p ), otvalid ); |
| |
| otvalid->nesting_level--; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* uses otvalid->extra1 (if > 0: array value limit) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_x_ux( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Count; |
| |
| |
| OTV_ENTER; |
| |
| OTV_LIMIT_CHECK( 2 ); |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| OTV_LIMIT_CHECK( Count * 2 ); |
| |
| if ( otvalid->extra1 ) |
| { |
| for ( ; Count > 0; Count-- ) |
| if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 ) |
| FT_INVALID_DATA; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* `ux' in the function's name is not really correct since only x-1 */ |
| /* elements are tested */ |
| |
| /* uses otvalid->extra1 (array value limit) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_x_y_ux_sy( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Count1, Count2; |
| |
| |
| OTV_ENTER; |
| |
| OTV_LIMIT_CHECK( 4 ); |
| Count1 = FT_NEXT_USHORT( p ); |
| Count2 = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count1 = %d)\n", Count1 )); |
| OTV_TRACE(( " (Count2 = %d)\n", Count2 )); |
| |
| if ( Count1 == 0 ) |
| FT_INVALID_DATA; |
| |
| OTV_LIMIT_CHECK( ( Count1 - 1 ) * 2 + Count2 * 4 ); |
| p += ( Count1 - 1 ) * 2; |
| |
| for ( ; Count2 > 0; Count2-- ) |
| { |
| if ( FT_NEXT_USHORT( p ) >= Count1 ) |
| FT_INVALID_DATA; |
| |
| if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 ) |
| FT_INVALID_DATA; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* `uy' in the function's name is not really correct since only y-1 */ |
| /* elements are tested */ |
| |
| /* uses otvalid->extra1 (array value limit) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt BacktrackCount, InputCount, LookaheadCount; |
| FT_UInt Count; |
| |
| |
| OTV_ENTER; |
| |
| OTV_LIMIT_CHECK( 2 ); |
| BacktrackCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (BacktrackCount = %d)\n", BacktrackCount )); |
| |
| OTV_LIMIT_CHECK( BacktrackCount * 2 + 2 ); |
| p += BacktrackCount * 2; |
| |
| InputCount = FT_NEXT_USHORT( p ); |
| if ( InputCount == 0 ) |
| FT_INVALID_DATA; |
| |
| OTV_TRACE(( " (InputCount = %d)\n", InputCount )); |
| |
| OTV_LIMIT_CHECK( InputCount * 2 ); |
| p += ( InputCount - 1 ) * 2; |
| |
| LookaheadCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (LookaheadCount = %d)\n", LookaheadCount )); |
| |
| OTV_LIMIT_CHECK( LookaheadCount * 2 + 2 ); |
| p += LookaheadCount * 2; |
| |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| OTV_LIMIT_CHECK( Count * 4 ); |
| |
| for ( ; Count > 0; Count-- ) |
| { |
| if ( FT_NEXT_USHORT( p ) >= InputCount ) |
| FT_INVALID_DATA; |
| |
| if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 ) |
| FT_INVALID_DATA; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra1 (valid->lookup_count) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_u_O_O_x_Onx( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Coverage, ClassDef, ClassSetCount; |
| OTV_Validate_Func func; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip Format */ |
| |
| OTV_LIMIT_CHECK( 6 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| ClassDef = FT_NEXT_USHORT( p ); |
| ClassSetCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ClassSetCount = %d)\n", ClassSetCount )); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, -1 ); |
| otv_ClassDef_validate( table + ClassDef, otvalid ); |
| |
| OTV_LIMIT_CHECK( ClassSetCount * 2 ); |
| |
| otvalid->nesting_level++; |
| func = otvalid->func[otvalid->nesting_level]; |
| otvalid->extra1 = otvalid->lookup_count; |
| |
| for ( ; ClassSetCount > 0; ClassSetCount-- ) |
| { |
| FT_UInt offset = FT_NEXT_USHORT( p ); |
| |
| |
| if ( offset ) |
| func( table + offset, otvalid ); |
| } |
| |
| otvalid->nesting_level--; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* uses otvalid->lookup_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_u_x_y_Ox_sy( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt GlyphCount, Count, count1; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip Format */ |
| |
| OTV_LIMIT_CHECK( 4 ); |
| GlyphCount = FT_NEXT_USHORT( p ); |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| OTV_LIMIT_CHECK( GlyphCount * 2 + Count * 4 ); |
| |
| for ( count1 = GlyphCount; count1 > 0; count1-- ) |
| otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 ); |
| |
| for ( ; Count > 0; Count-- ) |
| { |
| if ( FT_NEXT_USHORT( p ) >= GlyphCount ) |
| FT_INVALID_DATA; |
| |
| if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count ) |
| FT_INVALID_DATA; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra1 (valid->lookup_count) */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_u_O_O_O_O_x_Onx( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Coverage; |
| FT_UInt BacktrackClassDef, InputClassDef, LookaheadClassDef; |
| FT_UInt ChainClassSetCount; |
| OTV_Validate_Func func; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip Format */ |
| |
| OTV_LIMIT_CHECK( 10 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| BacktrackClassDef = FT_NEXT_USHORT( p ); |
| InputClassDef = FT_NEXT_USHORT( p ); |
| LookaheadClassDef = FT_NEXT_USHORT( p ); |
| ChainClassSetCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ChainClassSetCount = %d)\n", ChainClassSetCount )); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, -1 ); |
| |
| otv_ClassDef_validate( table + BacktrackClassDef, otvalid ); |
| otv_ClassDef_validate( table + InputClassDef, otvalid ); |
| otv_ClassDef_validate( table + LookaheadClassDef, otvalid ); |
| |
| OTV_LIMIT_CHECK( ChainClassSetCount * 2 ); |
| |
| otvalid->nesting_level++; |
| func = otvalid->func[otvalid->nesting_level]; |
| otvalid->extra1 = otvalid->lookup_count; |
| |
| for ( ; ChainClassSetCount > 0; ChainClassSetCount-- ) |
| { |
| FT_UInt offset = FT_NEXT_USHORT( p ); |
| |
| |
| if ( offset ) |
| func( table + offset, otvalid ); |
| } |
| |
| otvalid->nesting_level--; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* uses otvalid->lookup_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt BacktrackGlyphCount, InputGlyphCount, LookaheadGlyphCount; |
| FT_UInt count1, count2; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip Format */ |
| |
| OTV_LIMIT_CHECK( 2 ); |
| BacktrackGlyphCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount )); |
| |
| OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 ); |
| |
| for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- ) |
| otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 ); |
| |
| InputGlyphCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (InputGlyphCount = %d)\n", InputGlyphCount )); |
| |
| OTV_LIMIT_CHECK( InputGlyphCount * 2 + 2 ); |
| |
| for ( count1 = InputGlyphCount; count1 > 0; count1-- ) |
| otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 ); |
| |
| LookaheadGlyphCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount )); |
| |
| OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 ); |
| |
| for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- ) |
| otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 ); |
| |
| count2 = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", count2 )); |
| |
| OTV_LIMIT_CHECK( count2 * 4 ); |
| |
| for ( ; count2 > 0; count2-- ) |
| { |
| if ( FT_NEXT_USHORT( p ) >= InputGlyphCount ) |
| FT_INVALID_DATA; |
| |
| if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count ) |
| FT_INVALID_DATA; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| otv_GSUBGPOS_get_Lookup_count( FT_Bytes table ) |
| { |
| FT_Bytes p = table + 8; |
| |
| |
| return otv_LookupList_get_count( table + FT_NEXT_USHORT( p ) ); |
| } |
| |
| |
| FT_LOCAL_DEF( FT_UInt ) |
| otv_GSUBGPOS_have_MarkAttachmentType_flag( FT_Bytes table ) |
| { |
| FT_Bytes p, lookup; |
| FT_UInt count; |
| |
| |
| if ( !table ) |
| return 0; |
| |
| /* LookupList */ |
| p = table + 8; |
| table += FT_NEXT_USHORT( p ); |
| |
| /* LookupCount */ |
| p = table; |
| count = FT_NEXT_USHORT( p ); |
| |
| for ( ; count > 0; count-- ) |
| { |
| FT_Bytes oldp; |
| |
| |
| /* Lookup */ |
| lookup = table + FT_NEXT_USHORT( p ); |
| |
| oldp = p; |
| |
| /* LookupFlag */ |
| p = lookup + 2; |
| if ( FT_NEXT_USHORT( p ) & 0xFF00U ) |
| return 1; |
| |
| p = oldp; |
| } |
| |
| return 0; |
| } |
| |
| |
| /* END */ |
