forked from minhngoc25a/freetype2
454 lines
14 KiB
C
454 lines
14 KiB
C
/***************************************************************************/
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/* */
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/* otvmath.c */
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/* */
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/* OpenType MATH table validation (body). */
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/* */
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/* Copyright 2007-2018 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* Written by George Williams. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include "otvalid.h"
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#include "otvcommn.h"
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#include "otvgpos.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_otvmath
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH TYPOGRAPHIC CONSTANTS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_MathConstants_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt i;
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FT_UInt table_size;
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OTV_OPTIONAL_TABLE( DeviceTableOffset );
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OTV_NAME_ENTER( "MathConstants" );
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/* 56 constants, 51 have device tables */
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OTV_LIMIT_CHECK( 2 * ( 56 + 51 ) );
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table_size = 2 * ( 56 + 51 );
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p += 4 * 2; /* First 4 constants have no device tables */
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for ( i = 0; i < 51; i++ )
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{
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p += 2; /* skip the value */
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OTV_OPTIONAL_OFFSET( DeviceTableOffset );
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OTV_SIZE_CHECK( DeviceTableOffset );
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if ( DeviceTableOffset )
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otv_Device_validate( table + DeviceTableOffset, otvalid );
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH ITALICS CORRECTION *****/
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/***** MATH TOP ACCENT ATTACHMENT *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_MathItalicsCorrectionInfo_validate( FT_Bytes table,
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OTV_Validator otvalid,
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FT_Int isItalic )
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{
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FT_Bytes p = table;
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FT_UInt i, cnt, table_size;
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OTV_OPTIONAL_TABLE( Coverage );
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OTV_OPTIONAL_TABLE( DeviceTableOffset );
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FT_UNUSED( isItalic ); /* only used if tracing is active */
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OTV_NAME_ENTER( isItalic ? "MathItalicsCorrectionInfo"
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: "MathTopAccentAttachment" );
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OTV_LIMIT_CHECK( 4 );
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OTV_OPTIONAL_OFFSET( Coverage );
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cnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 4 * cnt );
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table_size = 4 + 4 * cnt;
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OTV_SIZE_CHECK( Coverage );
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otv_Coverage_validate( table + Coverage, otvalid, (FT_Int)cnt );
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for ( i = 0; i < cnt; i++ )
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{
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p += 2; /* Skip the value */
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OTV_OPTIONAL_OFFSET( DeviceTableOffset );
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OTV_SIZE_CHECK( DeviceTableOffset );
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if ( DeviceTableOffset )
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otv_Device_validate( table + DeviceTableOffset, otvalid );
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH KERNING *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_MathKern_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt i, cnt, table_size;
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OTV_OPTIONAL_TABLE( DeviceTableOffset );
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/* OTV_NAME_ENTER( "MathKern" );*/
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OTV_LIMIT_CHECK( 2 );
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cnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 4 * cnt + 2 );
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table_size = 4 + 4 * cnt;
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/* Heights */
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for ( i = 0; i < cnt; i++ )
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{
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p += 2; /* Skip the value */
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OTV_OPTIONAL_OFFSET( DeviceTableOffset );
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OTV_SIZE_CHECK( DeviceTableOffset );
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if ( DeviceTableOffset )
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otv_Device_validate( table + DeviceTableOffset, otvalid );
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}
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/* One more Kerning value */
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for ( i = 0; i < cnt + 1; i++ )
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{
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p += 2; /* Skip the value */
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OTV_OPTIONAL_OFFSET( DeviceTableOffset );
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OTV_SIZE_CHECK( DeviceTableOffset );
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if ( DeviceTableOffset )
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otv_Device_validate( table + DeviceTableOffset, otvalid );
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}
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OTV_EXIT;
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}
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static void
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otv_MathKernInfo_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt i, j, cnt, table_size;
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OTV_OPTIONAL_TABLE( Coverage );
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OTV_OPTIONAL_TABLE( MKRecordOffset );
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OTV_NAME_ENTER( "MathKernInfo" );
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OTV_LIMIT_CHECK( 4 );
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OTV_OPTIONAL_OFFSET( Coverage );
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cnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 8 * cnt );
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table_size = 4 + 8 * cnt;
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OTV_SIZE_CHECK( Coverage );
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otv_Coverage_validate( table + Coverage, otvalid, (FT_Int)cnt );
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for ( i = 0; i < cnt; i++ )
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{
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for ( j = 0; j < 4; j++ )
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{
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OTV_OPTIONAL_OFFSET( MKRecordOffset );
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OTV_SIZE_CHECK( MKRecordOffset );
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if ( MKRecordOffset )
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otv_MathKern_validate( table + MKRecordOffset, otvalid );
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}
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH GLYPH INFO *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_MathGlyphInfo_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt MathItalicsCorrectionInfo, MathTopAccentAttachment;
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FT_UInt ExtendedShapeCoverage, MathKernInfo;
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OTV_NAME_ENTER( "MathGlyphInfo" );
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OTV_LIMIT_CHECK( 8 );
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MathItalicsCorrectionInfo = FT_NEXT_USHORT( p );
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MathTopAccentAttachment = FT_NEXT_USHORT( p );
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ExtendedShapeCoverage = FT_NEXT_USHORT( p );
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MathKernInfo = FT_NEXT_USHORT( p );
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if ( MathItalicsCorrectionInfo )
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otv_MathItalicsCorrectionInfo_validate(
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table + MathItalicsCorrectionInfo, otvalid, TRUE );
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/* Italic correction and Top Accent Attachment have the same format */
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if ( MathTopAccentAttachment )
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otv_MathItalicsCorrectionInfo_validate(
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table + MathTopAccentAttachment, otvalid, FALSE );
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if ( ExtendedShapeCoverage )
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{
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OTV_NAME_ENTER( "ExtendedShapeCoverage" );
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otv_Coverage_validate( table + ExtendedShapeCoverage, otvalid, -1 );
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OTV_EXIT;
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}
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if ( MathKernInfo )
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otv_MathKernInfo_validate( table + MathKernInfo, otvalid );
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH GLYPH CONSTRUCTION *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static void
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otv_GlyphAssembly_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt pcnt, table_size;
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FT_UInt i;
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OTV_OPTIONAL_TABLE( DeviceTableOffset );
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/* OTV_NAME_ENTER( "GlyphAssembly" ); */
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OTV_LIMIT_CHECK( 6 );
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p += 2; /* Skip the Italics Correction value */
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OTV_OPTIONAL_OFFSET( DeviceTableOffset );
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pcnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 8 * pcnt );
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table_size = 6 + 8 * pcnt;
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OTV_SIZE_CHECK( DeviceTableOffset );
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if ( DeviceTableOffset )
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otv_Device_validate( table + DeviceTableOffset, otvalid );
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for ( i = 0; i < pcnt; i++ )
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{
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FT_UInt gid;
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gid = FT_NEXT_USHORT( p );
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if ( gid >= otvalid->glyph_count )
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FT_INVALID_GLYPH_ID;
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p += 2*4; /* skip the Start, End, Full, and Flags fields */
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}
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/* OTV_EXIT; */
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}
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static void
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otv_MathGlyphConstruction_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt vcnt, table_size;
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FT_UInt i;
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OTV_OPTIONAL_TABLE( GlyphAssembly );
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/* OTV_NAME_ENTER( "MathGlyphConstruction" ); */
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OTV_LIMIT_CHECK( 4 );
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OTV_OPTIONAL_OFFSET( GlyphAssembly );
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vcnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 4 * vcnt );
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table_size = 4 + 4 * vcnt;
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for ( i = 0; i < vcnt; i++ )
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{
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FT_UInt gid;
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gid = FT_NEXT_USHORT( p );
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if ( gid >= otvalid->glyph_count )
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FT_INVALID_GLYPH_ID;
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p += 2; /* skip the size */
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}
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OTV_SIZE_CHECK( GlyphAssembly );
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if ( GlyphAssembly )
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otv_GlyphAssembly_validate( table+GlyphAssembly, otvalid );
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/* OTV_EXIT; */
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}
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static void
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otv_MathVariants_validate( FT_Bytes table,
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OTV_Validator otvalid )
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{
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FT_Bytes p = table;
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FT_UInt vcnt, hcnt, i, table_size;
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OTV_OPTIONAL_TABLE( VCoverage );
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OTV_OPTIONAL_TABLE( HCoverage );
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OTV_OPTIONAL_TABLE( Offset );
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OTV_NAME_ENTER( "MathVariants" );
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OTV_LIMIT_CHECK( 10 );
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p += 2; /* Skip the MinConnectorOverlap constant */
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OTV_OPTIONAL_OFFSET( VCoverage );
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OTV_OPTIONAL_OFFSET( HCoverage );
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vcnt = FT_NEXT_USHORT( p );
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hcnt = FT_NEXT_USHORT( p );
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OTV_LIMIT_CHECK( 2 * vcnt + 2 * hcnt );
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table_size = 10 + 2 * vcnt + 2 * hcnt;
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OTV_SIZE_CHECK( VCoverage );
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if ( VCoverage )
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otv_Coverage_validate( table + VCoverage, otvalid, (FT_Int)vcnt );
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OTV_SIZE_CHECK( HCoverage );
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if ( HCoverage )
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otv_Coverage_validate( table + HCoverage, otvalid, (FT_Int)hcnt );
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for ( i = 0; i < vcnt; i++ )
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{
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OTV_OPTIONAL_OFFSET( Offset );
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OTV_SIZE_CHECK( Offset );
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otv_MathGlyphConstruction_validate( table + Offset, otvalid );
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}
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for ( i = 0; i < hcnt; i++ )
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{
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OTV_OPTIONAL_OFFSET( Offset );
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OTV_SIZE_CHECK( Offset );
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otv_MathGlyphConstruction_validate( table + Offset, otvalid );
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}
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OTV_EXIT;
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** MATH TABLE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/* sets otvalid->glyph_count */
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FT_LOCAL_DEF( void )
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otv_MATH_validate( FT_Bytes table,
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FT_UInt glyph_count,
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FT_Validator ftvalid )
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{
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OTV_ValidatorRec otvalidrec;
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OTV_Validator otvalid = &otvalidrec;
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FT_Bytes p = table;
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FT_UInt MathConstants, MathGlyphInfo, MathVariants;
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otvalid->root = ftvalid;
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FT_TRACE3(( "validating MATH table\n" ));
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OTV_INIT;
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OTV_LIMIT_CHECK( 10 );
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if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
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FT_INVALID_FORMAT;
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MathConstants = FT_NEXT_USHORT( p );
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MathGlyphInfo = FT_NEXT_USHORT( p );
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MathVariants = FT_NEXT_USHORT( p );
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otvalid->glyph_count = glyph_count;
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otv_MathConstants_validate( table + MathConstants,
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otvalid );
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otv_MathGlyphInfo_validate( table + MathGlyphInfo,
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otvalid );
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otv_MathVariants_validate ( table + MathVariants,
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otvalid );
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FT_TRACE4(( "\n" ));
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}
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/* END */
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