--- /dev/null
+/***************************************************************************/
+/* */
+/* otvmath.c */
+/* */
+/* OpenType MATH table validation (body). */
+/* */
+/* Copyright 2007-2017 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 otvalid )
+ {
+ 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, otvalid );
+ }
+
+ OTV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MATH ITALICS CORRECTION *****/
+ /***** MATH TOP ACCENT ATTACHMENT *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ otv_MathItalicsCorrectionInfo_validate( FT_Bytes table,
+ OTV_Validator otvalid,
+ 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, otvalid, (FT_Int)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, otvalid );
+ }
+
+ OTV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MATH KERNING *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ otv_MathKern_validate( FT_Bytes table,
+ OTV_Validator otvalid )
+ {
+ 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, otvalid );
+ }
+
+ /* 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, otvalid );
+ }
+
+ OTV_EXIT;
+ }
+
+
+ static void
+ otv_MathKernInfo_validate( FT_Bytes table,
+ OTV_Validator otvalid )
+ {
+ 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, otvalid, (FT_Int)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, otvalid );
+ }
+ }
+
+ OTV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MATH GLYPH INFO *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ otv_MathGlyphInfo_validate( FT_Bytes table,
+ OTV_Validator otvalid )
+ {
+ 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, otvalid, TRUE );
+
+ /* Italic correction and Top Accent Attachment have the same format */
+ if ( MathTopAccentAttachment )
+ otv_MathItalicsCorrectionInfo_validate(
+ table + MathTopAccentAttachment, otvalid, FALSE );
+
+ if ( ExtendedShapeCoverage )
+ {
+ OTV_NAME_ENTER( "ExtendedShapeCoverage" );
+ otv_Coverage_validate( table + ExtendedShapeCoverage, otvalid, -1 );
+ OTV_EXIT;
+ }
+
+ if ( MathKernInfo )
+ otv_MathKernInfo_validate( table + MathKernInfo, otvalid );
+
+ OTV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MATH GLYPH CONSTRUCTION *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static void
+ otv_GlyphAssembly_validate( FT_Bytes table,
+ OTV_Validator otvalid )
+ {
+ 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, otvalid );
+
+ for ( i = 0; i < pcnt; i++ )
+ {
+ FT_UInt gid;
+
+
+ gid = FT_NEXT_USHORT( p );
+ if ( gid >= otvalid->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 otvalid )
+ {
+ 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 >= otvalid->glyph_count )
+ FT_INVALID_GLYPH_ID;
+ p += 2; /* skip the size */
+ }
+
+ OTV_SIZE_CHECK( GlyphAssembly );
+ if ( GlyphAssembly )
+ otv_GlyphAssembly_validate( table+GlyphAssembly, otvalid );
+
+ /* OTV_EXIT; */
+ }
+
+
+ static void
+ otv_MathVariants_validate( FT_Bytes table,
+ OTV_Validator otvalid )
+ {
+ 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, otvalid, (FT_Int)vcnt );
+
+ OTV_SIZE_CHECK( HCoverage );
+ if ( HCoverage )
+ otv_Coverage_validate( table + HCoverage, otvalid, (FT_Int)hcnt );
+
+ for ( i = 0; i < vcnt; i++ )
+ {
+ OTV_OPTIONAL_OFFSET( Offset );
+ OTV_SIZE_CHECK( Offset );
+ otv_MathGlyphConstruction_validate( table + Offset, otvalid );
+ }
+
+ for ( i = 0; i < hcnt; i++ )
+ {
+ OTV_OPTIONAL_OFFSET( Offset );
+ OTV_SIZE_CHECK( Offset );
+ otv_MathGlyphConstruction_validate( table + Offset, otvalid );
+ }
+
+ OTV_EXIT;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** MATH TABLE *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ /* sets otvalid->glyph_count */
+
+ FT_LOCAL_DEF( void )
+ otv_MATH_validate( FT_Bytes table,
+ FT_UInt glyph_count,
+ FT_Validator ftvalid )
+ {
+ OTV_ValidatorRec otvalidrec;
+ OTV_Validator otvalid = &otvalidrec;
+ FT_Bytes p = table;
+ FT_UInt MathConstants, MathGlyphInfo, MathVariants;
+
+
+ otvalid->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 );
+
+ otvalid->glyph_count = glyph_count;
+
+ otv_MathConstants_validate( table + MathConstants,
+ otvalid );
+ otv_MathGlyphInfo_validate( table + MathGlyphInfo,
+ otvalid );
+ otv_MathVariants_validate ( table + MathVariants,
+ otvalid );
+
+ FT_TRACE4(( "\n" ));
+ }
+
+
+/* END */
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