ref: 03ceda9701cd8c08ea5b4ee0c2d558a98fc4ed7d
dir: /src/otvalid/otvbase.c/
/****************************************************************************
*
* otvbase.c
*
* OpenType BASE table validation (body).
*
* Copyright (C) 2004-2020 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 %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 ), 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 = %d)\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 = %d)\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 = %d)\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 = %d)\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 = %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 ), 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 */