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kc3-lang/freetype/src/otvalid/otvbase.c
Werner Lemberg
- src/otvalid/otvbase.c
-
/**************************************************************************** * * otvbase.c * * OpenType BASE table validation (body). * * Copyright (C) 2004-2025 by * David Turner, Robert Wilhelm, and Werner Lemberg. * * 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" /************************************************************************** * * 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 otvbase static void otv_BaseCoord_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt BaseCoordFormat; OTV_NAME_ENTER( "BaseCoord" ); OTV_LIMIT_CHECK( 4 ); BaseCoordFormat = FT_NEXT_USHORT( p ); p += 2; /* skip Coordinate */ OTV_TRACE(( " (format %u)\n", BaseCoordFormat )); switch ( BaseCoordFormat ) { case 1: /* BaseCoordFormat1 */ break; case 2: /* BaseCoordFormat2 */ OTV_LIMIT_CHECK( 4 ); /* ReferenceGlyph, BaseCoordPoint */ break; case 3: /* BaseCoordFormat3 */ OTV_LIMIT_CHECK( 2 ); /* DeviceTable */ otv_Device_validate( table + FT_NEXT_USHORT( p ), otvalid ); break; default: FT_INVALID_FORMAT; } OTV_EXIT; } static void otv_BaseTagList_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt BaseTagCount; OTV_NAME_ENTER( "BaseTagList" ); OTV_LIMIT_CHECK( 2 ); BaseTagCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseTagCount = %u)\n", BaseTagCount )); OTV_LIMIT_CHECK( BaseTagCount * 4 ); /* BaselineTag */ OTV_EXIT; } static void otv_BaseValues_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt BaseCoordCount; OTV_NAME_ENTER( "BaseValues" ); OTV_LIMIT_CHECK( 4 ); p += 2; /* skip DefaultIndex */ BaseCoordCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseCoordCount = %u)\n", BaseCoordCount )); OTV_LIMIT_CHECK( BaseCoordCount * 2 ); /* BaseCoord */ for ( ; BaseCoordCount > 0; BaseCoordCount-- ) otv_BaseCoord_validate( table + FT_NEXT_USHORT( p ), otvalid ); OTV_EXIT; } static void otv_MinMax_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt table_size; FT_UInt FeatMinMaxCount; OTV_OPTIONAL_TABLE( MinCoord ); OTV_OPTIONAL_TABLE( MaxCoord ); OTV_NAME_ENTER( "MinMax" ); OTV_LIMIT_CHECK( 6 ); OTV_OPTIONAL_OFFSET( MinCoord ); OTV_OPTIONAL_OFFSET( MaxCoord ); FeatMinMaxCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (FeatMinMaxCount = %u)\n", FeatMinMaxCount )); table_size = FeatMinMaxCount * 8 + 6; OTV_SIZE_CHECK( MinCoord ); if ( MinCoord ) otv_BaseCoord_validate( table + MinCoord, otvalid ); OTV_SIZE_CHECK( MaxCoord ); if ( MaxCoord ) otv_BaseCoord_validate( table + MaxCoord, otvalid ); OTV_LIMIT_CHECK( FeatMinMaxCount * 8 ); /* FeatMinMaxRecord */ for ( ; FeatMinMaxCount > 0; FeatMinMaxCount-- ) { p += 4; /* skip FeatureTableTag */ OTV_OPTIONAL_OFFSET( MinCoord ); OTV_OPTIONAL_OFFSET( MaxCoord ); OTV_SIZE_CHECK( MinCoord ); if ( MinCoord ) otv_BaseCoord_validate( table + MinCoord, otvalid ); OTV_SIZE_CHECK( MaxCoord ); if ( MaxCoord ) otv_BaseCoord_validate( table + MaxCoord, otvalid ); } OTV_EXIT; } static void otv_BaseScript_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt table_size; FT_UInt BaseLangSysCount; OTV_OPTIONAL_TABLE( BaseValues ); OTV_OPTIONAL_TABLE( DefaultMinMax ); OTV_NAME_ENTER( "BaseScript" ); OTV_LIMIT_CHECK( 6 ); OTV_OPTIONAL_OFFSET( BaseValues ); OTV_OPTIONAL_OFFSET( DefaultMinMax ); BaseLangSysCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseLangSysCount = %u)\n", BaseLangSysCount )); table_size = BaseLangSysCount * 6 + 6; OTV_SIZE_CHECK( BaseValues ); if ( BaseValues ) otv_BaseValues_validate( table + BaseValues, otvalid ); OTV_SIZE_CHECK( DefaultMinMax ); if ( DefaultMinMax ) otv_MinMax_validate( table + DefaultMinMax, otvalid ); OTV_LIMIT_CHECK( BaseLangSysCount * 6 ); /* BaseLangSysRecord */ for ( ; BaseLangSysCount > 0; BaseLangSysCount-- ) { p += 4; /* skip BaseLangSysTag */ otv_MinMax_validate( table + FT_NEXT_USHORT( p ), otvalid ); } OTV_EXIT; } static void otv_BaseScriptList_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt BaseScriptCount; OTV_NAME_ENTER( "BaseScriptList" ); OTV_LIMIT_CHECK( 2 ); BaseScriptCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseScriptCount = %u)\n", BaseScriptCount )); OTV_LIMIT_CHECK( BaseScriptCount * 6 ); /* BaseScriptRecord */ for ( ; BaseScriptCount > 0; BaseScriptCount-- ) { p += 4; /* skip BaseScriptTag */ /* BaseScript */ otv_BaseScript_validate( table + FT_NEXT_USHORT( p ), otvalid ); } OTV_EXIT; } static void otv_Axis_validate( FT_Bytes table, OTV_Validator otvalid ) { FT_Bytes p = table; FT_UInt table_size; OTV_OPTIONAL_TABLE( BaseTagList ); OTV_NAME_ENTER( "Axis" ); OTV_LIMIT_CHECK( 4 ); OTV_OPTIONAL_OFFSET( BaseTagList ); table_size = 4; OTV_SIZE_CHECK( BaseTagList ); if ( BaseTagList ) otv_BaseTagList_validate( table + BaseTagList, otvalid ); /* BaseScriptList */ otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), otvalid ); OTV_EXIT; } FT_LOCAL_DEF( void ) otv_BASE_validate( FT_Bytes table, FT_Validator ftvalid ) { OTV_ValidatorRec otvalidrec; OTV_Validator otvalid = &otvalidrec; FT_Bytes p = table; FT_UInt table_size; FT_UShort version; OTV_OPTIONAL_TABLE( HorizAxis ); OTV_OPTIONAL_TABLE( VertAxis ); OTV_OPTIONAL_TABLE32( itemVarStore ); otvalid->root = ftvalid; FT_TRACE3(( "validating BASE table\n" )); OTV_INIT; OTV_LIMIT_CHECK( 4 ); if ( FT_NEXT_USHORT( p ) != 1 ) /* majorVersion */ FT_INVALID_FORMAT; version = FT_NEXT_USHORT( p ); /* minorVersion */ table_size = 8; switch ( version ) { case 0: OTV_LIMIT_CHECK( 4 ); break; case 1: OTV_LIMIT_CHECK( 8 ); table_size += 4; break; default: FT_INVALID_FORMAT; } OTV_OPTIONAL_OFFSET( HorizAxis ); OTV_SIZE_CHECK( HorizAxis ); if ( HorizAxis ) otv_Axis_validate( table + HorizAxis, otvalid ); OTV_OPTIONAL_OFFSET( VertAxis ); OTV_SIZE_CHECK( VertAxis ); if ( VertAxis ) otv_Axis_validate( table + VertAxis, otvalid ); if ( version > 0 ) { OTV_OPTIONAL_OFFSET32( itemVarStore ); OTV_SIZE_CHECK32( itemVarStore ); if ( itemVarStore ) OTV_TRACE(( " [omitting itemVarStore validation]\n" )); /* XXX */ } FT_TRACE4(( "\n" )); } /* END */