319 lines
8.1 KiB
C
319 lines
8.1 KiB
C
/***************************************************************************/
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/* */
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/* otvbase.c */
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/* */
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/* OpenType BASE table validation (body). */
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/* */
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/* Copyright 2004-2017 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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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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/*************************************************************************/
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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_otvbase
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static void
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otv_BaseCoord_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 BaseCoordFormat;
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OTV_NAME_ENTER( "BaseCoord" );
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OTV_LIMIT_CHECK( 4 );
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BaseCoordFormat = FT_NEXT_USHORT( p );
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p += 2; /* skip Coordinate */
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OTV_TRACE(( " (format %d)\n", BaseCoordFormat ));
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switch ( BaseCoordFormat )
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{
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case 1: /* BaseCoordFormat1 */
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break;
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case 2: /* BaseCoordFormat2 */
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OTV_LIMIT_CHECK( 4 ); /* ReferenceGlyph, BaseCoordPoint */
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break;
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case 3: /* BaseCoordFormat3 */
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OTV_LIMIT_CHECK( 2 );
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/* DeviceTable */
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otv_Device_validate( table + FT_NEXT_USHORT( p ), otvalid );
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break;
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default:
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FT_INVALID_FORMAT;
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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_BaseTagList_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 BaseTagCount;
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OTV_NAME_ENTER( "BaseTagList" );
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OTV_LIMIT_CHECK( 2 );
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BaseTagCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (BaseTagCount = %d)\n", BaseTagCount ));
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OTV_LIMIT_CHECK( BaseTagCount * 4 ); /* BaselineTag */
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OTV_EXIT;
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}
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static void
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otv_BaseValues_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 BaseCoordCount;
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OTV_NAME_ENTER( "BaseValues" );
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OTV_LIMIT_CHECK( 4 );
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p += 2; /* skip DefaultIndex */
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BaseCoordCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (BaseCoordCount = %d)\n", BaseCoordCount ));
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OTV_LIMIT_CHECK( BaseCoordCount * 2 );
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/* BaseCoord */
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for ( ; BaseCoordCount > 0; BaseCoordCount-- )
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otv_BaseCoord_validate( table + FT_NEXT_USHORT( p ), otvalid );
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OTV_EXIT;
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}
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static void
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otv_MinMax_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 table_size;
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FT_UInt FeatMinMaxCount;
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OTV_OPTIONAL_TABLE( MinCoord );
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OTV_OPTIONAL_TABLE( MaxCoord );
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OTV_NAME_ENTER( "MinMax" );
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OTV_LIMIT_CHECK( 6 );
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OTV_OPTIONAL_OFFSET( MinCoord );
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OTV_OPTIONAL_OFFSET( MaxCoord );
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FeatMinMaxCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (FeatMinMaxCount = %d)\n", FeatMinMaxCount ));
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table_size = FeatMinMaxCount * 8 + 6;
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OTV_SIZE_CHECK( MinCoord );
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if ( MinCoord )
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otv_BaseCoord_validate( table + MinCoord, otvalid );
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OTV_SIZE_CHECK( MaxCoord );
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if ( MaxCoord )
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otv_BaseCoord_validate( table + MaxCoord, otvalid );
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OTV_LIMIT_CHECK( FeatMinMaxCount * 8 );
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/* FeatMinMaxRecord */
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for ( ; FeatMinMaxCount > 0; FeatMinMaxCount-- )
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{
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p += 4; /* skip FeatureTableTag */
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OTV_OPTIONAL_OFFSET( MinCoord );
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OTV_OPTIONAL_OFFSET( MaxCoord );
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OTV_SIZE_CHECK( MinCoord );
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if ( MinCoord )
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otv_BaseCoord_validate( table + MinCoord, otvalid );
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OTV_SIZE_CHECK( MaxCoord );
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if ( MaxCoord )
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otv_BaseCoord_validate( table + MaxCoord, 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_BaseScript_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 table_size;
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FT_UInt BaseLangSysCount;
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OTV_OPTIONAL_TABLE( BaseValues );
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OTV_OPTIONAL_TABLE( DefaultMinMax );
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OTV_NAME_ENTER( "BaseScript" );
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OTV_LIMIT_CHECK( 6 );
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OTV_OPTIONAL_OFFSET( BaseValues );
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OTV_OPTIONAL_OFFSET( DefaultMinMax );
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BaseLangSysCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (BaseLangSysCount = %d)\n", BaseLangSysCount ));
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table_size = BaseLangSysCount * 6 + 6;
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OTV_SIZE_CHECK( BaseValues );
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if ( BaseValues )
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otv_BaseValues_validate( table + BaseValues, otvalid );
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OTV_SIZE_CHECK( DefaultMinMax );
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if ( DefaultMinMax )
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otv_MinMax_validate( table + DefaultMinMax, otvalid );
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OTV_LIMIT_CHECK( BaseLangSysCount * 6 );
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/* BaseLangSysRecord */
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for ( ; BaseLangSysCount > 0; BaseLangSysCount-- )
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{
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p += 4; /* skip BaseLangSysTag */
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otv_MinMax_validate( table + FT_NEXT_USHORT( p ), 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_BaseScriptList_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 BaseScriptCount;
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OTV_NAME_ENTER( "BaseScriptList" );
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OTV_LIMIT_CHECK( 2 );
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BaseScriptCount = FT_NEXT_USHORT( p );
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OTV_TRACE(( " (BaseScriptCount = %d)\n", BaseScriptCount ));
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OTV_LIMIT_CHECK( BaseScriptCount * 6 );
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/* BaseScriptRecord */
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for ( ; BaseScriptCount > 0; BaseScriptCount-- )
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{
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p += 4; /* skip BaseScriptTag */
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/* BaseScript */
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otv_BaseScript_validate( table + FT_NEXT_USHORT( p ), 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_Axis_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 table_size;
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OTV_OPTIONAL_TABLE( BaseTagList );
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OTV_NAME_ENTER( "Axis" );
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OTV_LIMIT_CHECK( 4 );
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OTV_OPTIONAL_OFFSET( BaseTagList );
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table_size = 4;
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OTV_SIZE_CHECK( BaseTagList );
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if ( BaseTagList )
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otv_BaseTagList_validate( table + BaseTagList, otvalid );
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/* BaseScriptList */
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otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), otvalid );
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OTV_EXIT;
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}
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FT_LOCAL_DEF( void )
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otv_BASE_validate( FT_Bytes table,
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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 table_size;
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OTV_OPTIONAL_TABLE( HorizAxis );
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OTV_OPTIONAL_TABLE( VertAxis );
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otvalid->root = ftvalid;
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FT_TRACE3(( "validating BASE table\n" ));
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OTV_INIT;
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OTV_LIMIT_CHECK( 6 );
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if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */
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FT_INVALID_FORMAT;
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table_size = 6;
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OTV_OPTIONAL_OFFSET( HorizAxis );
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OTV_SIZE_CHECK( HorizAxis );
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if ( HorizAxis )
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otv_Axis_validate( table + HorizAxis, otvalid );
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OTV_OPTIONAL_OFFSET( VertAxis );
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OTV_SIZE_CHECK( VertAxis );
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if ( VertAxis )
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otv_Axis_validate( table + VertAxis, otvalid );
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FT_TRACE4(( "\n" ));
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}
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/* END */
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