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|
/****************************************************************************
*
* otvgpos.c
*
* OpenType GPOS table validation (body).
*
* Copyright (C) 2002-2019 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"
#include "otvgpos.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 otvgpos
static void
otv_Anchor_validate( FT_Bytes table,
OTV_Validator valid );
static void
otv_MarkArray_validate( FT_Bytes table,
OTV_Validator valid );
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define BaseArrayFunc otv_x_sxy
#define LigatureAttachFunc otv_x_sxy
#define Mark2ArrayFunc otv_x_sxy
/* uses valid->extra1 (counter) */
/* uses valid->extra2 (boolean to handle NULL anchor field) */
static void
otv_x_sxy( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Count, count1, table_size;
OTV_ENTER;
OTV_LIMIT_CHECK( 2 );
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", Count ));
OTV_LIMIT_CHECK( Count * otvalid->extra1 * 2 );
table_size = Count * otvalid->extra1 * 2 + 2;
for ( ; Count > 0; Count-- )
for ( count1 = otvalid->extra1; count1 > 0; count1-- )
{
OTV_OPTIONAL_TABLE( anchor_offset );
OTV_OPTIONAL_OFFSET( anchor_offset );
if ( otvalid->extra2 )
{
OTV_SIZE_CHECK( anchor_offset );
if ( anchor_offset )
otv_Anchor_validate( table + anchor_offset, otvalid );
}
else
otv_Anchor_validate( table + anchor_offset, otvalid );
}
OTV_EXIT;
}
#define MarkBasePosFormat1Func otv_u_O_O_u_O_O
#define MarkLigPosFormat1Func otv_u_O_O_u_O_O
#define MarkMarkPosFormat1Func otv_u_O_O_u_O_O
/* sets otvalid->extra1 (class count) */
static void
otv_u_O_O_u_O_O( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Coverage1, Coverage2, ClassCount;
FT_UInt Array1, Array2;
OTV_Validate_Func func;
OTV_ENTER;
p += 2; /* skip PosFormat */
OTV_LIMIT_CHECK( 10 );
Coverage1 = FT_NEXT_USHORT( p );
Coverage2 = FT_NEXT_USHORT( p );
ClassCount = FT_NEXT_USHORT( p );
Array1 = FT_NEXT_USHORT( p );
Array2 = FT_NEXT_USHORT( p );
otv_Coverage_validate( table + Coverage1, otvalid, -1 );
otv_Coverage_validate( table + Coverage2, otvalid, -1 );
otv_MarkArray_validate( table + Array1, otvalid );
otvalid->nesting_level++;
func = otvalid->func[otvalid->nesting_level];
otvalid->extra1 = ClassCount;
func( table + Array2, otvalid );
otvalid->nesting_level--;
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** VALUE RECORDS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static FT_UInt
otv_value_length( FT_UInt format )
{
FT_UInt count;
count = ( ( format & 0xAA ) >> 1 ) + ( format & 0x55 );
count = ( ( count & 0xCC ) >> 2 ) + ( count & 0x33 );
count = ( ( count & 0xF0 ) >> 4 ) + ( count & 0x0F );
return count * 2;
}
/* uses otvalid->extra3 (pointer to base table) */
static void
otv_ValueRecord_validate( FT_Bytes table,
FT_UInt format,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt count;
#ifdef FT_DEBUG_LEVEL_TRACE
FT_Int loop;
FT_ULong res = 0;
OTV_NAME_ENTER( "ValueRecord" );
/* display `format' in dual representation */
for ( loop = 7; loop >= 0; loop-- )
{
res <<= 4;
res += ( format >> loop ) & 1;
}
OTV_TRACE(( " (format 0b%08lx)\n", res ));
#endif
if ( format >= 0x100 )
FT_INVALID_FORMAT;
for ( count = 4; count > 0; count-- )
{
if ( format & 1 )
{
/* XPlacement, YPlacement, XAdvance, YAdvance */
OTV_LIMIT_CHECK( 2 );
p += 2;
}
format >>= 1;
}
for ( count = 4; count > 0; count-- )
{
if ( format & 1 )
{
FT_PtrDist table_size;
OTV_OPTIONAL_TABLE( device );
/* XPlaDevice, YPlaDevice, XAdvDevice, YAdvDevice */
OTV_LIMIT_CHECK( 2 );
OTV_OPTIONAL_OFFSET( device );
table_size = p - otvalid->extra3;
OTV_SIZE_CHECK( device );
if ( device )
otv_Device_validate( otvalid->extra3 + device, otvalid );
}
format >>= 1;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** ANCHORS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
otv_Anchor_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt AnchorFormat;
OTV_NAME_ENTER( "Anchor");
OTV_LIMIT_CHECK( 6 );
AnchorFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", AnchorFormat ));
p += 4; /* skip XCoordinate and YCoordinate */
switch ( AnchorFormat )
{
case 1:
break;
case 2:
OTV_LIMIT_CHECK( 2 ); /* AnchorPoint */
break;
case 3:
{
FT_UInt table_size;
OTV_OPTIONAL_TABLE( XDeviceTable );
OTV_OPTIONAL_TABLE( YDeviceTable );
OTV_LIMIT_CHECK( 4 );
OTV_OPTIONAL_OFFSET( XDeviceTable );
OTV_OPTIONAL_OFFSET( YDeviceTable );
table_size = 6 + 4;
OTV_SIZE_CHECK( XDeviceTable );
if ( XDeviceTable )
otv_Device_validate( table + XDeviceTable, otvalid );
OTV_SIZE_CHECK( YDeviceTable );
if ( YDeviceTable )
otv_Device_validate( table + YDeviceTable, otvalid );
}
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** MARK ARRAYS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
otv_MarkArray_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt MarkCount;
OTV_NAME_ENTER( "MarkArray" );
OTV_LIMIT_CHECK( 2 );
MarkCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (MarkCount = %d)\n", MarkCount ));
OTV_LIMIT_CHECK( MarkCount * 4 );
/* MarkRecord */
for ( ; MarkCount > 0; MarkCount-- )
{
p += 2; /* skip Class */
/* MarkAnchor */
otv_Anchor_validate( table + FT_NEXT_USHORT( p ), otvalid );
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 1 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra3 (pointer to base table) */
static void
otv_SinglePos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "SinglePos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
otvalid->extra3 = table;
switch ( PosFormat )
{
case 1: /* SinglePosFormat1 */
{
FT_UInt Coverage, ValueFormat;
OTV_LIMIT_CHECK( 4 );
Coverage = FT_NEXT_USHORT( p );
ValueFormat = FT_NEXT_USHORT( p );
otv_Coverage_validate( table + Coverage, otvalid, -1 );
otv_ValueRecord_validate( p, ValueFormat, otvalid ); /* Value */
}
break;
case 2: /* SinglePosFormat2 */
{
FT_UInt Coverage, ValueFormat, ValueCount, len_value;
OTV_LIMIT_CHECK( 6 );
Coverage = FT_NEXT_USHORT( p );
ValueFormat = FT_NEXT_USHORT( p );
ValueCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ValueCount = %d)\n", ValueCount ));
len_value = otv_value_length( ValueFormat );
otv_Coverage_validate( table + Coverage,
otvalid,
(FT_Int)ValueCount );
OTV_LIMIT_CHECK( ValueCount * len_value );
/* Value */
for ( ; ValueCount > 0; ValueCount-- )
{
otv_ValueRecord_validate( p, ValueFormat, otvalid );
p += len_value;
}
}
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 2 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra3 (pointer to base table) */
static void
otv_PairSet_validate( FT_Bytes table,
FT_UInt format1,
FT_UInt format2,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt value_len1, value_len2, PairValueCount;
OTV_NAME_ENTER( "PairSet" );
otvalid->extra3 = table;
OTV_LIMIT_CHECK( 2 );
PairValueCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (PairValueCount = %d)\n", PairValueCount ));
value_len1 = otv_value_length( format1 );
value_len2 = otv_value_length( format2 );
OTV_LIMIT_CHECK( PairValueCount * ( value_len1 + value_len2 + 2 ) );
/* PairValueRecord */
for ( ; PairValueCount > 0; PairValueCount-- )
{
p += 2; /* skip SecondGlyph */
if ( format1 )
otv_ValueRecord_validate( p, format1, otvalid ); /* Value1 */
p += value_len1;
if ( format2 )
otv_ValueRecord_validate( p, format2, otvalid ); /* Value2 */
p += value_len2;
}
OTV_EXIT;
}
/* sets otvalid->extra3 (pointer to base table) */
static void
otv_PairPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "PairPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1: /* PairPosFormat1 */
{
FT_UInt Coverage, ValueFormat1, ValueFormat2, PairSetCount;
OTV_LIMIT_CHECK( 8 );
Coverage = FT_NEXT_USHORT( p );
ValueFormat1 = FT_NEXT_USHORT( p );
ValueFormat2 = FT_NEXT_USHORT( p );
PairSetCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (PairSetCount = %d)\n", PairSetCount ));
otv_Coverage_validate( table + Coverage, otvalid, -1 );
OTV_LIMIT_CHECK( PairSetCount * 2 );
/* PairSetOffset */
for ( ; PairSetCount > 0; PairSetCount-- )
otv_PairSet_validate( table + FT_NEXT_USHORT( p ),
ValueFormat1, ValueFormat2, otvalid );
}
break;
case 2: /* PairPosFormat2 */
{
FT_UInt Coverage, ValueFormat1, ValueFormat2, ClassDef1, ClassDef2;
FT_UInt ClassCount1, ClassCount2, len_value1, len_value2, count;
OTV_LIMIT_CHECK( 14 );
Coverage = FT_NEXT_USHORT( p );
ValueFormat1 = FT_NEXT_USHORT( p );
ValueFormat2 = FT_NEXT_USHORT( p );
ClassDef1 = FT_NEXT_USHORT( p );
ClassDef2 = FT_NEXT_USHORT( p );
ClassCount1 = FT_NEXT_USHORT( p );
ClassCount2 = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ClassCount1 = %d)\n", ClassCount1 ));
OTV_TRACE(( " (ClassCount2 = %d)\n", ClassCount2 ));
len_value1 = otv_value_length( ValueFormat1 );
len_value2 = otv_value_length( ValueFormat2 );
otv_Coverage_validate( table + Coverage, otvalid, -1 );
otv_ClassDef_validate( table + ClassDef1, otvalid );
otv_ClassDef_validate( table + ClassDef2, otvalid );
OTV_LIMIT_CHECK( ClassCount1 * ClassCount2 *
( len_value1 + len_value2 ) );
otvalid->extra3 = table;
/* Class1Record */
for ( ; ClassCount1 > 0; ClassCount1-- )
{
/* Class2Record */
for ( count = ClassCount2; count > 0; count-- )
{
if ( ValueFormat1 )
/* Value1 */
otv_ValueRecord_validate( p, ValueFormat1, otvalid );
p += len_value1;
if ( ValueFormat2 )
/* Value2 */
otv_ValueRecord_validate( p, ValueFormat2, otvalid );
p += len_value2;
}
}
}
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 3 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
otv_CursivePos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "CursivePos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1: /* CursivePosFormat1 */
{
FT_UInt table_size;
FT_UInt Coverage, EntryExitCount;
OTV_OPTIONAL_TABLE( EntryAnchor );
OTV_OPTIONAL_TABLE( ExitAnchor );
OTV_LIMIT_CHECK( 4 );
Coverage = FT_NEXT_USHORT( p );
EntryExitCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (EntryExitCount = %d)\n", EntryExitCount ));
otv_Coverage_validate( table + Coverage,
otvalid,
(FT_Int)EntryExitCount );
OTV_LIMIT_CHECK( EntryExitCount * 4 );
table_size = EntryExitCount * 4 + 4;
/* EntryExitRecord */
for ( ; EntryExitCount > 0; EntryExitCount-- )
{
OTV_OPTIONAL_OFFSET( EntryAnchor );
OTV_OPTIONAL_OFFSET( ExitAnchor );
OTV_SIZE_CHECK( EntryAnchor );
if ( EntryAnchor )
otv_Anchor_validate( table + EntryAnchor, otvalid );
OTV_SIZE_CHECK( ExitAnchor );
if ( ExitAnchor )
otv_Anchor_validate( table + ExitAnchor, otvalid );
}
}
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 4 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* UNDOCUMENTED (in OpenType 1.5): */
/* BaseRecord tables can contain NULL pointers. */
/* sets otvalid->extra2 (1) */
static void
otv_MarkBasePos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "MarkBasePos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1:
otvalid->extra2 = 1;
OTV_NEST2( MarkBasePosFormat1, BaseArray );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 5 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra2 (1) */
static void
otv_MarkLigPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "MarkLigPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1:
otvalid->extra2 = 1;
OTV_NEST3( MarkLigPosFormat1, LigatureArray, LigatureAttach );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 6 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra2 (0) */
static void
otv_MarkMarkPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "MarkMarkPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1:
otvalid->extra2 = 0;
OTV_NEST2( MarkMarkPosFormat1, Mark2Array );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 7 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra1 (lookup count) */
static void
otv_ContextPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "ContextPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
otvalid->extra1 = otvalid->lookup_count;
OTV_NEST3( ContextPosFormat1, PosRuleSet, PosRule );
OTV_RUN( table, otvalid );
break;
case 2:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
OTV_NEST3( ContextPosFormat2, PosClassSet, PosClassRule );
OTV_RUN( table, otvalid );
break;
case 3:
OTV_NEST1( ContextPosFormat3 );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 8 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->extra1 (lookup count) */
static void
otv_ChainContextPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "ChainContextPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
otvalid->extra1 = otvalid->lookup_count;
OTV_NEST3( ChainContextPosFormat1,
ChainPosRuleSet, ChainPosRule );
OTV_RUN( table, otvalid );
break;
case 2:
/* no need to check glyph indices/classes used as input for these */
/* context rules since even invalid glyph indices/classes return */
/* meaningful results */
OTV_NEST3( ChainContextPosFormat2,
ChainPosClassSet, ChainPosClassRule );
OTV_RUN( table, otvalid );
break;
case 3:
OTV_NEST1( ChainContextPosFormat3 );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS LOOKUP TYPE 9 *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* uses otvalid->type_funcs */
static void
otv_ExtensionPos_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt PosFormat;
OTV_NAME_ENTER( "ExtensionPos" );
OTV_LIMIT_CHECK( 2 );
PosFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", PosFormat ));
switch ( PosFormat )
{
case 1: /* ExtensionPosFormat1 */
{
FT_UInt ExtensionLookupType;
FT_ULong ExtensionOffset;
OTV_Validate_Func validate;
OTV_LIMIT_CHECK( 6 );
ExtensionLookupType = FT_NEXT_USHORT( p );
ExtensionOffset = FT_NEXT_ULONG( p );
if ( ExtensionLookupType == 0 || ExtensionLookupType >= 9 )
FT_INVALID_DATA;
validate = otvalid->type_funcs[ExtensionLookupType - 1];
validate( table + ExtensionOffset, otvalid );
}
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
static const OTV_Validate_Func otv_gpos_validate_funcs[9] =
{
otv_SinglePos_validate,
otv_PairPos_validate,
otv_CursivePos_validate,
otv_MarkBasePos_validate,
otv_MarkLigPos_validate,
otv_MarkMarkPos_validate,
otv_ContextPos_validate,
otv_ChainContextPos_validate,
otv_ExtensionPos_validate
};
/* sets otvalid->type_count */
/* sets otvalid->type_funcs */
FT_LOCAL_DEF( void )
otv_GPOS_subtable_validate( FT_Bytes table,
OTV_Validator otvalid )
{
otvalid->type_count = 9;
otvalid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs;
otv_Lookup_validate( table, otvalid );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** GPOS TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* sets otvalid->glyph_count */
FT_LOCAL_DEF( void )
otv_GPOS_validate( FT_Bytes table,
FT_UInt glyph_count,
FT_Validator ftvalid )
{
OTV_ValidatorRec validrec;
OTV_Validator otvalid = &validrec;
FT_Bytes p = table;
FT_UInt table_size;
FT_UShort version;
FT_UInt ScriptList, FeatureList, LookupList;
OTV_OPTIONAL_TABLE32( featureVariations );
otvalid->root = ftvalid;
FT_TRACE3(( "validating GPOS 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 = 10;
switch ( version )
{
case 0:
OTV_LIMIT_CHECK( 6 );
break;
case 1:
OTV_LIMIT_CHECK( 10 );
table_size += 4;
break;
default:
FT_INVALID_FORMAT;
}
ScriptList = FT_NEXT_USHORT( p );
FeatureList = FT_NEXT_USHORT( p );
LookupList = FT_NEXT_USHORT( p );
otvalid->type_count = 9;
otvalid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs;
otvalid->glyph_count = glyph_count;
otv_LookupList_validate( table + LookupList,
otvalid );
otv_FeatureList_validate( table + FeatureList, table + LookupList,
otvalid );
otv_ScriptList_validate( table + ScriptList, table + FeatureList,
otvalid );
if ( version > 0 )
{
OTV_OPTIONAL_OFFSET32( featureVariations );
OTV_SIZE_CHECK32( featureVariations );
if ( featureVariations )
OTV_TRACE(( " [omitting featureVariations validation]\n" )); /* XXX */
}
FT_TRACE4(( "\n" ));
}
/* END */
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