Werner Lemberg
18 years ago
parent
b66178851a
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d76fe5a1af
15 changed files with 537 additions and 45 deletions
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/***************************************************************************/ |
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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 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 valid ) |
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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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/* 57 constants, 52 have device tables */ |
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OTV_LIMIT_CHECK( 2 * ( 57 + 52 ) ); |
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table_size = 2 * ( 57 + 52 ); |
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p += 4 * 2; /* First 4 constants have no device tables */ |
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for ( i = 0; i < 52; ++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, valid ); |
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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 valid, |
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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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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, valid ); |
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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, valid ); |
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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 valid ) |
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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, valid ); |
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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, valid ); |
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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 valid ) |
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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, valid ); |
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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, valid ); |
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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 valid ) |
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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, valid, 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, valid, FALSE ); |
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if ( ExtendedShapeCoverage ) { |
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OTV_NAME_ENTER( "ExtendedShapeCoverage" ); |
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otv_Coverage_validate( table + ExtendedShapeCoverage, valid ); |
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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, valid ); |
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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 valid ) |
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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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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, valid ); |
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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 valid ) |
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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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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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OTV_SIZE_CHECK( GlyphAssembly ); |
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if ( GlyphAssembly ) |
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otv_GlyphAssembly_validate( table+GlyphAssembly, valid ); |
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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 valid ) |
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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, valid ); |
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OTV_SIZE_CHECK( HCoverage ); |
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if ( HCoverage ) |
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otv_Coverage_validate( table + HCoverage, valid ); |
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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, valid ); |
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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, valid ); |
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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 valid->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 validrec; |
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OTV_Validator valid = &validrec; |
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FT_Bytes p = table; |
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FT_UInt MathConstants, MathGlyphInfo, MathVariants; |
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valid->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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valid->glyph_count = glyph_count; |
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otv_MathConstants_validate( table + MathConstants, |
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valid ); |
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otv_MathGlyphInfo_validate( table + MathGlyphInfo, |
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valid ); |
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otv_MathVariants_validate ( table + MathVariants, |
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valid ); |
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FT_TRACE4(( "\n" )); |
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} |
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/* END */ |
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