| /**************************************************************************** |
| * |
| * otvgpos.c |
| * |
| * OpenType GPOS table validation (body). |
| * |
| * Copyright (C) 2002-2021 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 "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 otvgpos |
| |
| |
| static void |
| otv_Anchor_validate( FT_Bytes table, |
| OTV_Validator valid ); |
| |
| static void |
| otv_MarkArray_validate( FT_Bytes table, |
| OTV_Validator valid ); |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** UTILITY FUNCTIONS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| #define BaseArrayFunc otv_x_sxy |
| #define LigatureAttachFunc otv_x_sxy |
| #define Mark2ArrayFunc otv_x_sxy |
| |
| /* uses valid->extra1 (counter) */ |
| /* uses valid->extra2 (boolean to handle NULL anchor field) */ |
| |
| static void |
| otv_x_sxy( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Count, count1, table_size; |
| |
| |
| OTV_ENTER; |
| |
| OTV_LIMIT_CHECK( 2 ); |
| |
| Count = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (Count = %d)\n", Count )); |
| |
| OTV_LIMIT_CHECK( Count * otvalid->extra1 * 2 ); |
| |
| table_size = Count * otvalid->extra1 * 2 + 2; |
| |
| for ( ; Count > 0; Count-- ) |
| for ( count1 = otvalid->extra1; count1 > 0; count1-- ) |
| { |
| OTV_OPTIONAL_TABLE( anchor_offset ); |
| |
| |
| OTV_OPTIONAL_OFFSET( anchor_offset ); |
| |
| if ( otvalid->extra2 ) |
| { |
| OTV_SIZE_CHECK( anchor_offset ); |
| if ( anchor_offset ) |
| otv_Anchor_validate( table + anchor_offset, otvalid ); |
| } |
| else |
| otv_Anchor_validate( table + anchor_offset, otvalid ); |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| #define MarkBasePosFormat1Func otv_u_O_O_u_O_O |
| #define MarkLigPosFormat1Func otv_u_O_O_u_O_O |
| #define MarkMarkPosFormat1Func otv_u_O_O_u_O_O |
| |
| /* sets otvalid->extra1 (class count) */ |
| |
| static void |
| otv_u_O_O_u_O_O( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt Coverage1, Coverage2, ClassCount; |
| FT_UInt Array1, Array2; |
| OTV_Validate_Func func; |
| |
| |
| OTV_ENTER; |
| |
| p += 2; /* skip PosFormat */ |
| |
| OTV_LIMIT_CHECK( 10 ); |
| Coverage1 = FT_NEXT_USHORT( p ); |
| Coverage2 = FT_NEXT_USHORT( p ); |
| ClassCount = FT_NEXT_USHORT( p ); |
| Array1 = FT_NEXT_USHORT( p ); |
| Array2 = FT_NEXT_USHORT( p ); |
| |
| otv_Coverage_validate( table + Coverage1, otvalid, -1 ); |
| otv_Coverage_validate( table + Coverage2, otvalid, -1 ); |
| |
| otv_MarkArray_validate( table + Array1, otvalid ); |
| |
| otvalid->nesting_level++; |
| func = otvalid->func[otvalid->nesting_level]; |
| otvalid->extra1 = ClassCount; |
| |
| func( table + Array2, otvalid ); |
| |
| otvalid->nesting_level--; |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** VALUE RECORDS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static FT_UInt |
| otv_value_length( FT_UInt format ) |
| { |
| FT_UInt count; |
| |
| |
| count = ( ( format & 0xAA ) >> 1 ) + ( format & 0x55 ); |
| count = ( ( count & 0xCC ) >> 2 ) + ( count & 0x33 ); |
| count = ( ( count & 0xF0 ) >> 4 ) + ( count & 0x0F ); |
| |
| return count * 2; |
| } |
| |
| |
| /* uses otvalid->extra3 (pointer to base table) */ |
| |
| static void |
| otv_ValueRecord_validate( FT_Bytes table, |
| FT_UInt format, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt count; |
| |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| FT_Int loop; |
| FT_ULong res = 0; |
| |
| |
| OTV_NAME_ENTER( "ValueRecord" ); |
| |
| /* display `format' in dual representation */ |
| for ( loop = 7; loop >= 0; loop-- ) |
| { |
| res <<= 4; |
| res += ( format >> loop ) & 1; |
| } |
| |
| OTV_TRACE(( " (format 0b%08lx)\n", res )); |
| #endif |
| |
| if ( format >= 0x100 ) |
| FT_INVALID_FORMAT; |
| |
| for ( count = 4; count > 0; count-- ) |
| { |
| if ( format & 1 ) |
| { |
| /* XPlacement, YPlacement, XAdvance, YAdvance */ |
| OTV_LIMIT_CHECK( 2 ); |
| p += 2; |
| } |
| |
| format >>= 1; |
| } |
| |
| for ( count = 4; count > 0; count-- ) |
| { |
| if ( format & 1 ) |
| { |
| FT_PtrDist table_size; |
| |
| OTV_OPTIONAL_TABLE( device ); |
| |
| |
| /* XPlaDevice, YPlaDevice, XAdvDevice, YAdvDevice */ |
| OTV_LIMIT_CHECK( 2 ); |
| OTV_OPTIONAL_OFFSET( device ); |
| |
| table_size = p - otvalid->extra3; |
| |
| OTV_SIZE_CHECK( device ); |
| if ( device ) |
| otv_Device_validate( otvalid->extra3 + device, otvalid ); |
| } |
| format >>= 1; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** ANCHORS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| otv_Anchor_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt AnchorFormat; |
| |
| |
| OTV_NAME_ENTER( "Anchor"); |
| |
| OTV_LIMIT_CHECK( 6 ); |
| AnchorFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", AnchorFormat )); |
| |
| p += 4; /* skip XCoordinate and YCoordinate */ |
| |
| switch ( AnchorFormat ) |
| { |
| case 1: |
| break; |
| |
| case 2: |
| OTV_LIMIT_CHECK( 2 ); /* AnchorPoint */ |
| break; |
| |
| case 3: |
| { |
| FT_UInt table_size; |
| |
| OTV_OPTIONAL_TABLE( XDeviceTable ); |
| OTV_OPTIONAL_TABLE( YDeviceTable ); |
| |
| |
| OTV_LIMIT_CHECK( 4 ); |
| OTV_OPTIONAL_OFFSET( XDeviceTable ); |
| OTV_OPTIONAL_OFFSET( YDeviceTable ); |
| |
| table_size = 6 + 4; |
| |
| OTV_SIZE_CHECK( XDeviceTable ); |
| if ( XDeviceTable ) |
| otv_Device_validate( table + XDeviceTable, otvalid ); |
| |
| OTV_SIZE_CHECK( YDeviceTable ); |
| if ( YDeviceTable ) |
| otv_Device_validate( table + YDeviceTable, otvalid ); |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** MARK ARRAYS *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| otv_MarkArray_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt MarkCount; |
| |
| |
| OTV_NAME_ENTER( "MarkArray" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| MarkCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (MarkCount = %d)\n", MarkCount )); |
| |
| OTV_LIMIT_CHECK( MarkCount * 4 ); |
| |
| /* MarkRecord */ |
| for ( ; MarkCount > 0; MarkCount-- ) |
| { |
| p += 2; /* skip Class */ |
| /* MarkAnchor */ |
| otv_Anchor_validate( table + FT_NEXT_USHORT( p ), otvalid ); |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 1 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra3 (pointer to base table) */ |
| |
| static void |
| otv_SinglePos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "SinglePos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| otvalid->extra3 = table; |
| |
| switch ( PosFormat ) |
| { |
| case 1: /* SinglePosFormat1 */ |
| { |
| FT_UInt Coverage, ValueFormat; |
| |
| |
| OTV_LIMIT_CHECK( 4 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| ValueFormat = FT_NEXT_USHORT( p ); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, -1 ); |
| otv_ValueRecord_validate( p, ValueFormat, otvalid ); /* Value */ |
| } |
| break; |
| |
| case 2: /* SinglePosFormat2 */ |
| { |
| FT_UInt Coverage, ValueFormat, ValueCount, len_value; |
| |
| |
| OTV_LIMIT_CHECK( 6 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| ValueFormat = FT_NEXT_USHORT( p ); |
| ValueCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ValueCount = %d)\n", ValueCount )); |
| |
| len_value = otv_value_length( ValueFormat ); |
| |
| otv_Coverage_validate( table + Coverage, |
| otvalid, |
| (FT_Int)ValueCount ); |
| |
| OTV_LIMIT_CHECK( ValueCount * len_value ); |
| |
| /* Value */ |
| for ( ; ValueCount > 0; ValueCount-- ) |
| { |
| otv_ValueRecord_validate( p, ValueFormat, otvalid ); |
| p += len_value; |
| } |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 2 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra3 (pointer to base table) */ |
| |
| static void |
| otv_PairSet_validate( FT_Bytes table, |
| FT_UInt format1, |
| FT_UInt format2, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt value_len1, value_len2, PairValueCount; |
| |
| |
| OTV_NAME_ENTER( "PairSet" ); |
| |
| otvalid->extra3 = table; |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PairValueCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (PairValueCount = %d)\n", PairValueCount )); |
| |
| value_len1 = otv_value_length( format1 ); |
| value_len2 = otv_value_length( format2 ); |
| |
| OTV_LIMIT_CHECK( PairValueCount * ( value_len1 + value_len2 + 2 ) ); |
| |
| /* PairValueRecord */ |
| for ( ; PairValueCount > 0; PairValueCount-- ) |
| { |
| p += 2; /* skip SecondGlyph */ |
| |
| if ( format1 ) |
| otv_ValueRecord_validate( p, format1, otvalid ); /* Value1 */ |
| p += value_len1; |
| |
| if ( format2 ) |
| otv_ValueRecord_validate( p, format2, otvalid ); /* Value2 */ |
| p += value_len2; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /* sets otvalid->extra3 (pointer to base table) */ |
| |
| static void |
| otv_PairPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "PairPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: /* PairPosFormat1 */ |
| { |
| FT_UInt Coverage, ValueFormat1, ValueFormat2, PairSetCount; |
| |
| |
| OTV_LIMIT_CHECK( 8 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| ValueFormat1 = FT_NEXT_USHORT( p ); |
| ValueFormat2 = FT_NEXT_USHORT( p ); |
| PairSetCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (PairSetCount = %d)\n", PairSetCount )); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, -1 ); |
| |
| OTV_LIMIT_CHECK( PairSetCount * 2 ); |
| |
| /* PairSetOffset */ |
| for ( ; PairSetCount > 0; PairSetCount-- ) |
| otv_PairSet_validate( table + FT_NEXT_USHORT( p ), |
| ValueFormat1, ValueFormat2, otvalid ); |
| } |
| break; |
| |
| case 2: /* PairPosFormat2 */ |
| { |
| FT_UInt Coverage, ValueFormat1, ValueFormat2, ClassDef1, ClassDef2; |
| FT_UInt ClassCount1, ClassCount2, len_value1, len_value2, count; |
| |
| |
| OTV_LIMIT_CHECK( 14 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| ValueFormat1 = FT_NEXT_USHORT( p ); |
| ValueFormat2 = FT_NEXT_USHORT( p ); |
| ClassDef1 = FT_NEXT_USHORT( p ); |
| ClassDef2 = FT_NEXT_USHORT( p ); |
| ClassCount1 = FT_NEXT_USHORT( p ); |
| ClassCount2 = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (ClassCount1 = %d)\n", ClassCount1 )); |
| OTV_TRACE(( " (ClassCount2 = %d)\n", ClassCount2 )); |
| |
| len_value1 = otv_value_length( ValueFormat1 ); |
| len_value2 = otv_value_length( ValueFormat2 ); |
| |
| otv_Coverage_validate( table + Coverage, otvalid, -1 ); |
| otv_ClassDef_validate( table + ClassDef1, otvalid ); |
| otv_ClassDef_validate( table + ClassDef2, otvalid ); |
| |
| OTV_LIMIT_CHECK( ClassCount1 * ClassCount2 * |
| ( len_value1 + len_value2 ) ); |
| |
| otvalid->extra3 = table; |
| |
| /* Class1Record */ |
| for ( ; ClassCount1 > 0; ClassCount1-- ) |
| { |
| /* Class2Record */ |
| for ( count = ClassCount2; count > 0; count-- ) |
| { |
| if ( ValueFormat1 ) |
| /* Value1 */ |
| otv_ValueRecord_validate( p, ValueFormat1, otvalid ); |
| p += len_value1; |
| |
| if ( ValueFormat2 ) |
| /* Value2 */ |
| otv_ValueRecord_validate( p, ValueFormat2, otvalid ); |
| p += len_value2; |
| } |
| } |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 3 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| static void |
| otv_CursivePos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "CursivePos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: /* CursivePosFormat1 */ |
| { |
| FT_UInt table_size; |
| FT_UInt Coverage, EntryExitCount; |
| |
| OTV_OPTIONAL_TABLE( EntryAnchor ); |
| OTV_OPTIONAL_TABLE( ExitAnchor ); |
| |
| |
| OTV_LIMIT_CHECK( 4 ); |
| Coverage = FT_NEXT_USHORT( p ); |
| EntryExitCount = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (EntryExitCount = %d)\n", EntryExitCount )); |
| |
| otv_Coverage_validate( table + Coverage, |
| otvalid, |
| (FT_Int)EntryExitCount ); |
| |
| OTV_LIMIT_CHECK( EntryExitCount * 4 ); |
| |
| table_size = EntryExitCount * 4 + 4; |
| |
| /* EntryExitRecord */ |
| for ( ; EntryExitCount > 0; EntryExitCount-- ) |
| { |
| OTV_OPTIONAL_OFFSET( EntryAnchor ); |
| OTV_OPTIONAL_OFFSET( ExitAnchor ); |
| |
| OTV_SIZE_CHECK( EntryAnchor ); |
| if ( EntryAnchor ) |
| otv_Anchor_validate( table + EntryAnchor, otvalid ); |
| |
| OTV_SIZE_CHECK( ExitAnchor ); |
| if ( ExitAnchor ) |
| otv_Anchor_validate( table + ExitAnchor, otvalid ); |
| } |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 4 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* UNDOCUMENTED (in OpenType 1.5): */ |
| /* BaseRecord tables can contain NULL pointers. */ |
| |
| /* sets otvalid->extra2 (1) */ |
| |
| static void |
| otv_MarkBasePos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "MarkBasePos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: |
| otvalid->extra2 = 1; |
| OTV_NEST2( MarkBasePosFormat1, BaseArray ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 5 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra2 (1) */ |
| |
| static void |
| otv_MarkLigPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "MarkLigPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: |
| otvalid->extra2 = 1; |
| OTV_NEST3( MarkLigPosFormat1, LigatureArray, LigatureAttach ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 6 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra2 (0) */ |
| |
| static void |
| otv_MarkMarkPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "MarkMarkPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: |
| otvalid->extra2 = 0; |
| OTV_NEST2( MarkMarkPosFormat1, Mark2Array ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 7 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra1 (lookup count) */ |
| |
| static void |
| otv_ContextPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "ContextPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: |
| /* no need to check glyph indices/classes used as input for these */ |
| /* context rules since even invalid glyph indices/classes return */ |
| /* meaningful results */ |
| |
| otvalid->extra1 = otvalid->lookup_count; |
| OTV_NEST3( ContextPosFormat1, PosRuleSet, PosRule ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| case 2: |
| /* no need to check glyph indices/classes used as input for these */ |
| /* context rules since even invalid glyph indices/classes return */ |
| /* meaningful results */ |
| |
| OTV_NEST3( ContextPosFormat2, PosClassSet, PosClassRule ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| case 3: |
| OTV_NEST1( ContextPosFormat3 ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 8 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->extra1 (lookup count) */ |
| |
| static void |
| otv_ChainContextPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "ChainContextPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: |
| /* no need to check glyph indices/classes used as input for these */ |
| /* context rules since even invalid glyph indices/classes return */ |
| /* meaningful results */ |
| |
| otvalid->extra1 = otvalid->lookup_count; |
| OTV_NEST3( ChainContextPosFormat1, |
| ChainPosRuleSet, ChainPosRule ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| case 2: |
| /* no need to check glyph indices/classes used as input for these */ |
| /* context rules since even invalid glyph indices/classes return */ |
| /* meaningful results */ |
| |
| OTV_NEST3( ChainContextPosFormat2, |
| ChainPosClassSet, ChainPosClassRule ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| case 3: |
| OTV_NEST1( ChainContextPosFormat3 ); |
| OTV_RUN( table, otvalid ); |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS LOOKUP TYPE 9 *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* uses otvalid->type_funcs */ |
| |
| static void |
| otv_ExtensionPos_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| FT_Bytes p = table; |
| FT_UInt PosFormat; |
| |
| |
| OTV_NAME_ENTER( "ExtensionPos" ); |
| |
| OTV_LIMIT_CHECK( 2 ); |
| PosFormat = FT_NEXT_USHORT( p ); |
| |
| OTV_TRACE(( " (format %d)\n", PosFormat )); |
| |
| switch ( PosFormat ) |
| { |
| case 1: /* ExtensionPosFormat1 */ |
| { |
| FT_UInt ExtensionLookupType; |
| FT_ULong ExtensionOffset; |
| OTV_Validate_Func validate; |
| |
| |
| OTV_LIMIT_CHECK( 6 ); |
| ExtensionLookupType = FT_NEXT_USHORT( p ); |
| ExtensionOffset = FT_NEXT_ULONG( p ); |
| |
| if ( ExtensionLookupType == 0 || ExtensionLookupType >= 9 ) |
| FT_INVALID_DATA; |
| |
| validate = otvalid->type_funcs[ExtensionLookupType - 1]; |
| validate( table + ExtensionOffset, otvalid ); |
| } |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| OTV_EXIT; |
| } |
| |
| |
| static const OTV_Validate_Func otv_gpos_validate_funcs[9] = |
| { |
| otv_SinglePos_validate, |
| otv_PairPos_validate, |
| otv_CursivePos_validate, |
| otv_MarkBasePos_validate, |
| otv_MarkLigPos_validate, |
| otv_MarkMarkPos_validate, |
| otv_ContextPos_validate, |
| otv_ChainContextPos_validate, |
| otv_ExtensionPos_validate |
| }; |
| |
| |
| /* sets otvalid->type_count */ |
| /* sets otvalid->type_funcs */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_GPOS_subtable_validate( FT_Bytes table, |
| OTV_Validator otvalid ) |
| { |
| otvalid->type_count = 9; |
| otvalid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs; |
| |
| otv_Lookup_validate( table, otvalid ); |
| } |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /***** *****/ |
| /***** GPOS TABLE *****/ |
| /***** *****/ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| /* sets otvalid->glyph_count */ |
| |
| FT_LOCAL_DEF( void ) |
| otv_GPOS_validate( FT_Bytes table, |
| FT_UInt glyph_count, |
| FT_Validator ftvalid ) |
| { |
| OTV_ValidatorRec validrec; |
| OTV_Validator otvalid = &validrec; |
| FT_Bytes p = table; |
| FT_UInt table_size; |
| FT_UShort version; |
| FT_UInt ScriptList, FeatureList, LookupList; |
| |
| OTV_OPTIONAL_TABLE32( featureVariations ); |
| |
| |
| otvalid->root = ftvalid; |
| |
| FT_TRACE3(( "validating GPOS table\n" )); |
| OTV_INIT; |
| |
| OTV_LIMIT_CHECK( 4 ); |
| |
| if ( FT_NEXT_USHORT( p ) != 1 ) /* majorVersion */ |
| FT_INVALID_FORMAT; |
| |
| version = FT_NEXT_USHORT( p ); /* minorVersion */ |
| |
| table_size = 10; |
| switch ( version ) |
| { |
| case 0: |
| OTV_LIMIT_CHECK( 6 ); |
| break; |
| |
| case 1: |
| OTV_LIMIT_CHECK( 10 ); |
| table_size += 4; |
| break; |
| |
| default: |
| FT_INVALID_FORMAT; |
| } |
| |
| ScriptList = FT_NEXT_USHORT( p ); |
| FeatureList = FT_NEXT_USHORT( p ); |
| LookupList = FT_NEXT_USHORT( p ); |
| |
| otvalid->type_count = 9; |
| otvalid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs; |
| otvalid->glyph_count = glyph_count; |
| |
| otv_LookupList_validate( table + LookupList, |
| otvalid ); |
| otv_FeatureList_validate( table + FeatureList, table + LookupList, |
| otvalid ); |
| otv_ScriptList_validate( table + ScriptList, table + FeatureList, |
| otvalid ); |
| |
| if ( version > 0 ) |
| { |
| OTV_OPTIONAL_OFFSET32( featureVariations ); |
| OTV_SIZE_CHECK32( featureVariations ); |
| if ( featureVariations ) |
| OTV_TRACE(( " [omitting featureVariations validation]\n" )); /* XXX */ |
| } |
| |
| FT_TRACE4(( "\n" )); |
| } |
| |
| |
| /* END */ |
