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kc3-lang/freetype/src/otvalid/otvgdef.c
Werner Lemberg
- src/otvalid/otvgdef.c
-
/**************************************************************************** * * otvgdef.c * * OpenType GDEF table validation (body). * * Copyright (C) 2004-2023 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" /************************************************************************** * * 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 otvgdef /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** UTILITY FUNCTIONS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ #define AttachListFunc otv_O_x_Ox #define LigCaretListFunc otv_O_x_Ox /* sets valid->extra1 (0) */ static void otv_O_x_Ox( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_Bytes Coverage; FT_UInt GlyphCount; OTV_Validate_Func func; OTV_ENTER; OTV_LIMIT_CHECK( 4 ); Coverage = table + FT_NEXT_USHORT( p ); GlyphCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); otv_Coverage_validate( Coverage, otvalid, (FT_Int)GlyphCount ); if ( GlyphCount != otv_Coverage_get_count( Coverage ) ) FT_INVALID_DATA; OTV_LIMIT_CHECK( GlyphCount * 2 ); otvalid->nesting_level++; func = otvalid->func[otvalid->nesting_level]; otvalid->extra1 = 0; for ( ; GlyphCount > 0; GlyphCount-- ) func( table + FT_NEXT_USHORT( p ), otvalid ); otvalid->nesting_level--; OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** LIGATURE CARETS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ #define CaretValueFunc otv_CaretValue_validate static void otv_CaretValue_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt CaretValueFormat; OTV_ENTER; OTV_LIMIT_CHECK( 4 ); CaretValueFormat = FT_NEXT_USHORT( p ); OTV_TRACE(( " (format = %d)\n", CaretValueFormat )); switch ( CaretValueFormat ) { case 1: /* CaretValueFormat1 */ /* skip Coordinate, no test */ break; case 2: /* CaretValueFormat2 */ /* skip CaretValuePoint, no test */ break; case 3: /* CaretValueFormat3 */ p += 2; /* skip Coordinate */ OTV_LIMIT_CHECK( 2 ); /* DeviceTable */ otv_Device_validate( table + FT_NEXT_USHORT( p ), otvalid ); break; default: FT_INVALID_FORMAT; } OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MARK GLYPH SETS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_MarkGlyphSets_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt MarkGlyphSetCount; OTV_NAME_ENTER( "MarkGlyphSets" ); p += 2; /* skip Format */ OTV_LIMIT_CHECK( 2 ); MarkGlyphSetCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (MarkGlyphSetCount = %d)\n", MarkGlyphSetCount )); OTV_LIMIT_CHECK( MarkGlyphSetCount * 4 ); /* CoverageOffsets */ for ( ; MarkGlyphSetCount > 0; MarkGlyphSetCount-- ) otv_Coverage_validate( table + FT_NEXT_ULONG( p ), otvalid, -1 ); OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** GDEF TABLE *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /* sets otvalid->glyph_count */ FT_LOCAL_DEF( void ) otv_GDEF_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 table_size; FT_UShort version; FT_Bool need_MarkAttachClassDef = 1; OTV_OPTIONAL_TABLE( GlyphClassDef ); OTV_OPTIONAL_TABLE( AttachListOffset ); OTV_OPTIONAL_TABLE( LigCaretListOffset ); OTV_OPTIONAL_TABLE( MarkAttachClassDef ); OTV_OPTIONAL_TABLE( MarkGlyphSetsDef ); OTV_OPTIONAL_TABLE32( itemVarStore ); otvalid->root = ftvalid; FT_TRACE3(( "validating GDEF 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: /* MarkAttachClassDef has been added to the OpenType */ /* specification without increasing GDEF's version, */ /* so we use this ugly hack to find out whether the */ /* table is needed actually. */ need_MarkAttachClassDef = FT_BOOL( otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) || otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) ); if ( need_MarkAttachClassDef ) { OTV_LIMIT_CHECK( 8 ); table_size += 2; } else OTV_LIMIT_CHECK( 6 ); /* OpenType < 1.2 */ break; case 2: OTV_LIMIT_CHECK( 10 ); table_size += 4; break; case 3: OTV_LIMIT_CHECK( 14 ); table_size += 8; break; default: FT_INVALID_FORMAT; } otvalid->glyph_count = glyph_count; OTV_OPTIONAL_OFFSET( GlyphClassDef ); OTV_SIZE_CHECK( GlyphClassDef ); if ( GlyphClassDef ) otv_ClassDef_validate( table + GlyphClassDef, otvalid ); OTV_OPTIONAL_OFFSET( AttachListOffset ); OTV_SIZE_CHECK( AttachListOffset ); if ( AttachListOffset ) { OTV_NEST2( AttachList, AttachPoint ); OTV_RUN( table + AttachListOffset, otvalid ); } OTV_OPTIONAL_OFFSET( LigCaretListOffset ); OTV_SIZE_CHECK( LigCaretListOffset ); if ( LigCaretListOffset ) { OTV_NEST3( LigCaretList, LigGlyph, CaretValue ); OTV_RUN( table + LigCaretListOffset, otvalid ); } if ( need_MarkAttachClassDef ) { OTV_OPTIONAL_OFFSET( MarkAttachClassDef ); OTV_SIZE_CHECK( MarkAttachClassDef ); if ( MarkAttachClassDef ) otv_ClassDef_validate( table + MarkAttachClassDef, otvalid ); } if ( version > 0 ) { OTV_OPTIONAL_OFFSET( MarkGlyphSetsDef ); OTV_SIZE_CHECK( MarkGlyphSetsDef ); if ( MarkGlyphSetsDef ) otv_MarkGlyphSets_validate( table + MarkGlyphSetsDef, otvalid ); } if ( version > 2 ) { OTV_OPTIONAL_OFFSET32( itemVarStore ); OTV_SIZE_CHECK32( itemVarStore ); if ( itemVarStore ) OTV_TRACE(( " [omitting itemVarStore validation]\n" )); /* XXX */ } FT_TRACE4(( "\n" )); } /* END */