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kc3-lang/freetype/src/otvalid/otvmath.c
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Author :
Werner Lemberg
Date : 2008-11-29 22:50:24
Hash : 1a5d561d
Message : * src/autofit/afcjk.c, src/base/ftoutln.c, src/base/ftrfork.c, src/bdf/bdfdrivr.c, src/gxvalid/gxvmorx.c, src/otvalid/otvmath.c, src/pcf/pcfdrivr.c, src/psnames/pstables.h, src/smooth/ftgrays.c, src/tools/glnames.py, src/truetype/ttinterp.c, src/type1/t1load.c, src/type42/t42objs.c, src/winfonts/winfnt.c: Fix compiler warnings (Atari PureC).
- src/otvalid/otvmath.c
-
/***************************************************************************/ /* */ /* otvmath.c */ /* */ /* OpenType MATH table validation (body). */ /* */ /* Copyright 2007, 2008 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* Written by George Williams. */ /* */ /* 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_otvmath /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH TYPOGRAPHIC CONSTANTS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_MathConstants_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt i; FT_UInt table_size; OTV_OPTIONAL_TABLE( DeviceTableOffset ); OTV_NAME_ENTER( "MathConstants" ); /* 56 constants, 51 have device tables */ OTV_LIMIT_CHECK( 2 * ( 56 + 51 ) ); table_size = 2 * ( 56 + 51 ); p += 4 * 2; /* First 4 constants have no device tables */ for ( i = 0; i < 51; ++i ) { p += 2; /* skip the value */ OTV_OPTIONAL_OFFSET( DeviceTableOffset ); OTV_SIZE_CHECK( DeviceTableOffset ); if ( DeviceTableOffset ) otv_Device_validate( table + DeviceTableOffset, valid ); } OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH ITALICS CORRECTION *****/ /***** MATH TOP ACCENT ATTACHMENT *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_MathItalicsCorrectionInfo_validate( FT_Bytes table, OTV_Validator valid, FT_Int isItalic ) { FT_Bytes p = table; FT_UInt i, cnt, table_size ; OTV_OPTIONAL_TABLE( Coverage ); OTV_OPTIONAL_TABLE( DeviceTableOffset ); FT_UNUSED( isItalic ); /* only used if tracing is active */ OTV_NAME_ENTER( isItalic ? "MathItalicsCorrectionInfo" : "MathTopAccentAttachment" ); OTV_LIMIT_CHECK( 4 ); OTV_OPTIONAL_OFFSET( Coverage ); cnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 4 * cnt ); table_size = 4 + 4 * cnt; OTV_SIZE_CHECK( Coverage ); otv_Coverage_validate( table + Coverage, valid, cnt ); for ( i = 0; i < cnt; ++i ) { p += 2; /* Skip the value */ OTV_OPTIONAL_OFFSET( DeviceTableOffset ); OTV_SIZE_CHECK( DeviceTableOffset ); if ( DeviceTableOffset ) otv_Device_validate( table + DeviceTableOffset, valid ); } OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH KERNING *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_MathKern_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt i, cnt, table_size; OTV_OPTIONAL_TABLE( DeviceTableOffset ); /* OTV_NAME_ENTER( "MathKern" );*/ OTV_LIMIT_CHECK( 2 ); cnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 4 * cnt + 2 ); table_size = 4 + 4 * cnt; /* Heights */ for ( i = 0; i < cnt; ++i ) { p += 2; /* Skip the value */ OTV_OPTIONAL_OFFSET( DeviceTableOffset ); OTV_SIZE_CHECK( DeviceTableOffset ); if ( DeviceTableOffset ) otv_Device_validate( table + DeviceTableOffset, valid ); } /* One more Kerning value */ for ( i = 0; i < cnt + 1; ++i ) { p += 2; /* Skip the value */ OTV_OPTIONAL_OFFSET( DeviceTableOffset ); OTV_SIZE_CHECK( DeviceTableOffset ); if ( DeviceTableOffset ) otv_Device_validate( table + DeviceTableOffset, valid ); } OTV_EXIT; } static void otv_MathKernInfo_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt i, j, cnt, table_size; OTV_OPTIONAL_TABLE( Coverage ); OTV_OPTIONAL_TABLE( MKRecordOffset ); OTV_NAME_ENTER( "MathKernInfo" ); OTV_LIMIT_CHECK( 4 ); OTV_OPTIONAL_OFFSET( Coverage ); cnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 8 * cnt ); table_size = 4 + 8 * cnt; OTV_SIZE_CHECK( Coverage ); otv_Coverage_validate( table + Coverage, valid, cnt ); for ( i = 0; i < cnt; ++i ) { for ( j = 0; j < 4; ++j ) { OTV_OPTIONAL_OFFSET( MKRecordOffset ); OTV_SIZE_CHECK( MKRecordOffset ); if ( MKRecordOffset ) otv_MathKern_validate( table + MKRecordOffset, valid ); } } OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH GLYPH INFO *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_MathGlyphInfo_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt MathItalicsCorrectionInfo, MathTopAccentAttachment; FT_UInt ExtendedShapeCoverage, MathKernInfo; OTV_NAME_ENTER( "MathGlyphInfo" ); OTV_LIMIT_CHECK( 8 ); MathItalicsCorrectionInfo = FT_NEXT_USHORT( p ); MathTopAccentAttachment = FT_NEXT_USHORT( p ); ExtendedShapeCoverage = FT_NEXT_USHORT( p ); MathKernInfo = FT_NEXT_USHORT( p ); if ( MathItalicsCorrectionInfo ) otv_MathItalicsCorrectionInfo_validate( table + MathItalicsCorrectionInfo, valid, TRUE ); /* Italic correction and Top Accent Attachment have the same format */ if ( MathTopAccentAttachment ) otv_MathItalicsCorrectionInfo_validate( table + MathTopAccentAttachment, valid, FALSE ); if ( ExtendedShapeCoverage ) { OTV_NAME_ENTER( "ExtendedShapeCoverage" ); otv_Coverage_validate( table + ExtendedShapeCoverage, valid, -1 ); OTV_EXIT; } if ( MathKernInfo ) otv_MathKernInfo_validate( table + MathKernInfo, valid ); OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH GLYPH CONSTRUCTION *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ static void otv_GlyphAssembly_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt pcnt, table_size; FT_UInt i; OTV_OPTIONAL_TABLE( DeviceTableOffset ); /* OTV_NAME_ENTER( "GlyphAssembly" ); */ OTV_LIMIT_CHECK( 6 ); p += 2; /* Skip the Italics Correction value */ OTV_OPTIONAL_OFFSET( DeviceTableOffset ); pcnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 8 * pcnt ); table_size = 6 + 8 * pcnt; OTV_SIZE_CHECK( DeviceTableOffset ); if ( DeviceTableOffset ) otv_Device_validate( table + DeviceTableOffset, valid ); for ( i = 0; i < pcnt; ++i ) { FT_UInt gid; gid = FT_NEXT_USHORT( p ); if ( gid >= valid->glyph_count ) FT_INVALID_GLYPH_ID; p += 2*4; /* skip the Start, End, Full, and Flags fields */ } /* OTV_EXIT; */ } static void otv_MathGlyphConstruction_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt vcnt, table_size; FT_UInt i; OTV_OPTIONAL_TABLE( GlyphAssembly ); /* OTV_NAME_ENTER( "MathGlyphConstruction" ); */ OTV_LIMIT_CHECK( 4 ); OTV_OPTIONAL_OFFSET( GlyphAssembly ); vcnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 4 * vcnt ); table_size = 4 + 4 * vcnt; for ( i = 0; i < vcnt; ++i ) { FT_UInt gid; gid = FT_NEXT_USHORT( p ); if ( gid >= valid->glyph_count ) FT_INVALID_GLYPH_ID; p += 2; /* skip the size */ } OTV_SIZE_CHECK( GlyphAssembly ); if ( GlyphAssembly ) otv_GlyphAssembly_validate( table+GlyphAssembly, valid ); /* OTV_EXIT; */ } static void otv_MathVariants_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt vcnt, hcnt, i, table_size; OTV_OPTIONAL_TABLE( VCoverage ); OTV_OPTIONAL_TABLE( HCoverage ); OTV_OPTIONAL_TABLE( Offset ); OTV_NAME_ENTER( "MathVariants" ); OTV_LIMIT_CHECK( 10 ); p += 2; /* Skip the MinConnectorOverlap constant */ OTV_OPTIONAL_OFFSET( VCoverage ); OTV_OPTIONAL_OFFSET( HCoverage ); vcnt = FT_NEXT_USHORT( p ); hcnt = FT_NEXT_USHORT( p ); OTV_LIMIT_CHECK( 2 * vcnt + 2 * hcnt ); table_size = 10 + 2 * vcnt + 2 * hcnt; OTV_SIZE_CHECK( VCoverage ); if ( VCoverage ) otv_Coverage_validate( table + VCoverage, valid, vcnt ); OTV_SIZE_CHECK( HCoverage ); if ( HCoverage ) otv_Coverage_validate( table + HCoverage, valid, hcnt ); for ( i = 0; i < vcnt; ++i ) { OTV_OPTIONAL_OFFSET( Offset ); OTV_SIZE_CHECK( Offset ); otv_MathGlyphConstruction_validate( table + Offset, valid ); } for ( i = 0; i < hcnt; ++i ) { OTV_OPTIONAL_OFFSET( Offset ); OTV_SIZE_CHECK( Offset ); otv_MathGlyphConstruction_validate( table + Offset, valid ); } OTV_EXIT; } /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** MATH TABLE *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /* sets valid->glyph_count */ FT_LOCAL_DEF( void ) otv_MATH_validate( FT_Bytes table, FT_UInt glyph_count, FT_Validator ftvalid ) { OTV_ValidatorRec validrec; OTV_Validator valid = &validrec; FT_Bytes p = table; FT_UInt MathConstants, MathGlyphInfo, MathVariants; valid->root = ftvalid; FT_TRACE3(( "validating MATH table\n" )); OTV_INIT; OTV_LIMIT_CHECK( 10 ); if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ FT_INVALID_FORMAT; MathConstants = FT_NEXT_USHORT( p ); MathGlyphInfo = FT_NEXT_USHORT( p ); MathVariants = FT_NEXT_USHORT( p ); valid->glyph_count = glyph_count; otv_MathConstants_validate( table + MathConstants, valid ); otv_MathGlyphInfo_validate( table + MathGlyphInfo, valid ); otv_MathVariants_validate ( table + MathVariants, valid ); FT_TRACE4(( "\n" )); } /* END */