ref: 9fbfc6af07bf1d199712b317e5a179237834b144
dir: /src/otvalid/otvbase.c/
/***************************************************************************/ /* */ /* otvbase.c */ /* */ /* OpenType BASE table validation (body). */ /* */ /* Copyright 2004 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 trace_otvbase static void otv_BaseCoord_validate( FT_Bytes table, OTV_Validator valid ) { 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 %d)\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 ), valid ); break; default: FT_INVALID_DATA; } OTV_EXIT; } static void otv_BaseTagList_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt BaseTagCount; OTV_NAME_ENTER( "BaseTagList" ); OTV_LIMIT_CHECK( 2 ); BaseTagCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseTagCount = %d)\n", BaseTagCount )); OTV_LIMIT_CHECK( BaseTagCount * 4 ); /* BaselineTag */ OTV_EXIT; } static void otv_BaseValues_validate( FT_Bytes table, OTV_Validator valid ) { 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 = %d)\n", BaseCoordCount )); OTV_LIMIT_CHECK( BaseCoordCount * 2 ); /* BaseCoord */ for ( ; BaseCoordCount > 0; BaseCoordCount-- ) otv_BaseCoord_validate( table + FT_NEXT_USHORT( p ), valid ); OTV_EXIT; } static void otv_MinMax_validate( FT_Bytes table, OTV_Validator valid ) { 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 = %d)\n", FeatMinMaxCount )); table_size = FeatMinMaxCount * 8 + 6; OTV_SIZE_CHECK( MinCoord ); if ( MinCoord ) otv_BaseCoord_validate( table + MinCoord, valid ); OTV_SIZE_CHECK( MaxCoord ); if ( MaxCoord ) otv_BaseCoord_validate( table + MaxCoord, valid ); 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, valid ); OTV_SIZE_CHECK( MaxCoord ); if ( MaxCoord ) otv_BaseCoord_validate( table + MaxCoord, valid ); } OTV_EXIT; } static void otv_BaseScript_validate( FT_Bytes table, OTV_Validator valid ) { 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 = %d)\n", BaseLangSysCount )); table_size = BaseLangSysCount * 6 + 6; OTV_SIZE_CHECK( BaseValues ); if ( BaseValues ) otv_BaseValues_validate( table + BaseValues, valid ); OTV_SIZE_CHECK( DefaultMinMax ); if ( DefaultMinMax ) otv_MinMax_validate( table + DefaultMinMax, valid ); OTV_LIMIT_CHECK( BaseLangSysCount * 6 ); /* BaseLangSysRecord */ for ( ; BaseLangSysCount > 0; BaseLangSysCount-- ) { p += 4; /* skip BaseLangSysTag */ otv_MinMax_validate( table + FT_NEXT_USHORT( p ), valid ); } OTV_EXIT; } static void otv_BaseScriptList_validate( FT_Bytes table, OTV_Validator valid ) { FT_Bytes p = table; FT_UInt BaseScriptCount; OTV_NAME_ENTER( "BaseScriptList" ); OTV_LIMIT_CHECK( 2 ); BaseScriptCount = FT_NEXT_USHORT( p ); OTV_TRACE(( " (BaseScriptCount = %d)\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 ), valid ); } OTV_EXIT; } static void otv_Axis_validate( FT_Bytes table, OTV_Validator valid ) { 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, valid ); /* BaseScriptList */ otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), valid ); OTV_EXIT; } FT_LOCAL_DEF( void ) otv_BASE_validate( FT_Bytes table, FT_Validator ftvalid ) { OTV_ValidatorRec validrec; OTV_Validator valid = &validrec; FT_Bytes p = table; FT_UInt table_size; OTV_OPTIONAL_TABLE( HorizAxis ); OTV_OPTIONAL_TABLE( VertAxis ); valid->root = ftvalid; FT_TRACE3(( "validating BASE table\n" )); OTV_INIT; OTV_LIMIT_CHECK( 6 ); if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ FT_INVALID_DATA; table_size = 6; OTV_OPTIONAL_OFFSET( HorizAxis ); OTV_SIZE_CHECK( HorizAxis ); if ( HorizAxis ) otv_Axis_validate( table + HorizAxis, valid ); OTV_OPTIONAL_OFFSET( VertAxis ); OTV_SIZE_CHECK( VertAxis ); if ( VertAxis ) otv_Axis_validate( table + VertAxis, valid ); FT_TRACE4(( "\n" )); } /* END */