ref: d45d4b97e6a03cfe21a2952138cf6e970fc358e5
dir: /src/otvalid/otvcommn.c/
/***************************************************************************/
/* */
/* otvcommn.c */
/* */
/* OpenType common tables validation (body). */
/* */
/* Copyright 2004-2018 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 "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_otvcommon
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** COVERAGE TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
otv_Coverage_validate( FT_Bytes table,
OTV_Validator otvalid,
FT_Int expected_count )
{
FT_Bytes p = table;
FT_UInt CoverageFormat;
FT_UInt total = 0;
OTV_NAME_ENTER( "Coverage" );
OTV_LIMIT_CHECK( 4 );
CoverageFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", CoverageFormat ));
switch ( CoverageFormat )
{
case 1: /* CoverageFormat1 */
{
FT_UInt GlyphCount;
FT_UInt i;
GlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */
for ( i = 0; i < GlyphCount; i++ )
{
FT_UInt gid;
gid = FT_NEXT_USHORT( p );
if ( gid >= otvalid->glyph_count )
FT_INVALID_GLYPH_ID;
}
total = GlyphCount;
}
break;
case 2: /* CoverageFormat2 */
{
FT_UInt n, RangeCount;
FT_UInt Start, End, StartCoverageIndex, last = 0;
RangeCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (RangeCount = %d)\n", RangeCount ));
OTV_LIMIT_CHECK( RangeCount * 6 );
/* RangeRecord */
for ( n = 0; n < RangeCount; n++ )
{
Start = FT_NEXT_USHORT( p );
End = FT_NEXT_USHORT( p );
StartCoverageIndex = FT_NEXT_USHORT( p );
if ( Start > End || StartCoverageIndex != total )
FT_INVALID_DATA;
if ( End >= otvalid->glyph_count )
FT_INVALID_GLYPH_ID;
if ( n > 0 && Start <= last )
FT_INVALID_DATA;
total += End - Start + 1;
last = End;
}
}
break;
default:
FT_INVALID_FORMAT;
}
/* Generally, a coverage table offset has an associated count field. */
/* The number of glyphs in the table should match this field. If */
/* there is no associated count, a value of -1 tells us not to check. */
if ( expected_count != -1 && (FT_UInt)expected_count != total )
FT_INVALID_DATA;
OTV_EXIT;
}
FT_LOCAL_DEF( FT_UInt )
otv_Coverage_get_first( FT_Bytes table )
{
FT_Bytes p = table;
p += 4; /* skip CoverageFormat and Glyph/RangeCount */
return FT_NEXT_USHORT( p );
}
FT_LOCAL_DEF( FT_UInt )
otv_Coverage_get_last( FT_Bytes table )
{
FT_Bytes p = table;
FT_UInt CoverageFormat = FT_NEXT_USHORT( p );
FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */
FT_UInt result = 0;
switch ( CoverageFormat )
{
case 1:
p += ( count - 1 ) * 2;
result = FT_NEXT_USHORT( p );
break;
case 2:
p += ( count - 1 ) * 6 + 2;
result = FT_NEXT_USHORT( p );
break;
default:
;
}
return result;
}
FT_LOCAL_DEF( FT_UInt )
otv_Coverage_get_count( FT_Bytes table )
{
FT_Bytes p = table;
FT_UInt CoverageFormat = FT_NEXT_USHORT( p );
FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */
FT_UInt result = 0;
switch ( CoverageFormat )
{
case 1:
return count;
case 2:
{
FT_UInt Start, End;
for ( ; count > 0; count-- )
{
Start = FT_NEXT_USHORT( p );
End = FT_NEXT_USHORT( p );
p += 2; /* skip StartCoverageIndex */
result += End - Start + 1;
}
}
break;
default:
;
}
return result;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CLASS DEFINITION TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
otv_ClassDef_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt ClassFormat;
OTV_NAME_ENTER( "ClassDef" );
OTV_LIMIT_CHECK( 4 );
ClassFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", ClassFormat ));
switch ( ClassFormat )
{
case 1: /* ClassDefFormat1 */
{
FT_UInt StartGlyph;
FT_UInt GlyphCount;
OTV_LIMIT_CHECK( 4 );
StartGlyph = FT_NEXT_USHORT( p );
GlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */
if ( StartGlyph + GlyphCount - 1 >= otvalid->glyph_count )
FT_INVALID_GLYPH_ID;
}
break;
case 2: /* ClassDefFormat2 */
{
FT_UInt n, ClassRangeCount;
FT_UInt Start, End, last = 0;
ClassRangeCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ClassRangeCount = %d)\n", ClassRangeCount ));
OTV_LIMIT_CHECK( ClassRangeCount * 6 );
/* ClassRangeRecord */
for ( n = 0; n < ClassRangeCount; n++ )
{
Start = FT_NEXT_USHORT( p );
End = FT_NEXT_USHORT( p );
p += 2; /* skip Class */
if ( Start > End || ( n > 0 && Start <= last ) )
FT_INVALID_DATA;
if ( End >= otvalid->glyph_count )
FT_INVALID_GLYPH_ID;
last = End;
}
}
break;
default:
FT_INVALID_FORMAT;
}
/* no need to check glyph indices used as input to class definition */
/* tables since even invalid glyph indices return a meaningful result */
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** DEVICE TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
otv_Device_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt StartSize, EndSize, DeltaFormat, count;
OTV_NAME_ENTER( "Device" );
OTV_LIMIT_CHECK( 6 );
StartSize = FT_NEXT_USHORT( p );
EndSize = FT_NEXT_USHORT( p );
DeltaFormat = FT_NEXT_USHORT( p );
if ( DeltaFormat == 0x8000U )
{
/* VariationIndex, nothing to do */
}
else
{
if ( DeltaFormat < 1 || DeltaFormat > 3 )
FT_INVALID_FORMAT;
if ( EndSize < StartSize )
FT_INVALID_DATA;
count = EndSize - StartSize + 1;
OTV_LIMIT_CHECK( ( 1 << DeltaFormat ) * count / 8 ); /* DeltaValue */
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** LOOKUPS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* uses otvalid->type_count */
/* uses otvalid->type_funcs */
FT_LOCAL_DEF( void )
otv_Lookup_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt LookupType, LookupFlag, SubTableCount;
OTV_Validate_Func validate;
OTV_NAME_ENTER( "Lookup" );
OTV_LIMIT_CHECK( 6 );
LookupType = FT_NEXT_USHORT( p );
LookupFlag = FT_NEXT_USHORT( p );
SubTableCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (type %d)\n", LookupType ));
if ( LookupType == 0 || LookupType > otvalid->type_count )
FT_INVALID_DATA;
validate = otvalid->type_funcs[LookupType - 1];
OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount ));
OTV_LIMIT_CHECK( SubTableCount * 2 );
/* SubTable */
for ( ; SubTableCount > 0; SubTableCount-- )
validate( table + FT_NEXT_USHORT( p ), otvalid );
if ( LookupFlag & 0x10 )
OTV_LIMIT_CHECK( 2 ); /* MarkFilteringSet */
OTV_EXIT;
}
/* uses valid->lookup_count */
FT_LOCAL_DEF( void )
otv_LookupList_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt LookupCount;
OTV_NAME_ENTER( "LookupList" );
OTV_LIMIT_CHECK( 2 );
LookupCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount ));
OTV_LIMIT_CHECK( LookupCount * 2 );
otvalid->lookup_count = LookupCount;
/* Lookup */
for ( ; LookupCount > 0; LookupCount-- )
otv_Lookup_validate( table + FT_NEXT_USHORT( p ), otvalid );
OTV_EXIT;
}
static FT_UInt
otv_LookupList_get_count( FT_Bytes table )
{
return FT_NEXT_USHORT( table );
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FEATURES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* uses otvalid->lookup_count */
FT_LOCAL_DEF( void )
otv_Feature_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt LookupCount;
OTV_NAME_ENTER( "Feature" );
OTV_LIMIT_CHECK( 4 );
p += 2; /* skip FeatureParams (unused) */
LookupCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount ));
OTV_LIMIT_CHECK( LookupCount * 2 );
/* LookupListIndex */
for ( ; LookupCount > 0; LookupCount-- )
if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count )
FT_INVALID_DATA;
OTV_EXIT;
}
static FT_UInt
otv_Feature_get_count( FT_Bytes table )
{
return FT_NEXT_USHORT( table );
}
/* sets otvalid->lookup_count */
FT_LOCAL_DEF( void )
otv_FeatureList_validate( FT_Bytes table,
FT_Bytes lookups,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt FeatureCount;
OTV_NAME_ENTER( "FeatureList" );
OTV_LIMIT_CHECK( 2 );
FeatureCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount ));
OTV_LIMIT_CHECK( FeatureCount * 2 );
otvalid->lookup_count = otv_LookupList_get_count( lookups );
/* FeatureRecord */
for ( ; FeatureCount > 0; FeatureCount-- )
{
p += 4; /* skip FeatureTag */
/* Feature */
otv_Feature_validate( table + FT_NEXT_USHORT( p ), otvalid );
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** LANGUAGE SYSTEM *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* uses otvalid->extra1 (number of features) */
FT_LOCAL_DEF( void )
otv_LangSys_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt ReqFeatureIndex;
FT_UInt FeatureCount;
OTV_NAME_ENTER( "LangSys" );
OTV_LIMIT_CHECK( 6 );
p += 2; /* skip LookupOrder (unused) */
ReqFeatureIndex = FT_NEXT_USHORT( p );
FeatureCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ReqFeatureIndex = %d)\n", ReqFeatureIndex ));
OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount ));
if ( ReqFeatureIndex != 0xFFFFU && ReqFeatureIndex >= otvalid->extra1 )
FT_INVALID_DATA;
OTV_LIMIT_CHECK( FeatureCount * 2 );
/* FeatureIndex */
for ( ; FeatureCount > 0; FeatureCount-- )
if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 )
FT_INVALID_DATA;
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SCRIPTS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( void )
otv_Script_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_UInt DefaultLangSys, LangSysCount;
FT_Bytes p = table;
OTV_NAME_ENTER( "Script" );
OTV_LIMIT_CHECK( 4 );
DefaultLangSys = FT_NEXT_USHORT( p );
LangSysCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LangSysCount = %d)\n", LangSysCount ));
if ( DefaultLangSys != 0 )
otv_LangSys_validate( table + DefaultLangSys, otvalid );
OTV_LIMIT_CHECK( LangSysCount * 6 );
/* LangSysRecord */
for ( ; LangSysCount > 0; LangSysCount-- )
{
p += 4; /* skip LangSysTag */
/* LangSys */
otv_LangSys_validate( table + FT_NEXT_USHORT( p ), otvalid );
}
OTV_EXIT;
}
/* sets otvalid->extra1 (number of features) */
FT_LOCAL_DEF( void )
otv_ScriptList_validate( FT_Bytes table,
FT_Bytes features,
OTV_Validator otvalid )
{
FT_UInt ScriptCount;
FT_Bytes p = table;
OTV_NAME_ENTER( "ScriptList" );
OTV_LIMIT_CHECK( 2 );
ScriptCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount ));
OTV_LIMIT_CHECK( ScriptCount * 6 );
otvalid->extra1 = otv_Feature_get_count( features );
/* ScriptRecord */
for ( ; ScriptCount > 0; ScriptCount-- )
{
p += 4; /* skip ScriptTag */
otv_Script_validate( table + FT_NEXT_USHORT( p ), otvalid ); /* Script */
}
OTV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** UTILITY FUNCTIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*
u: uint16
ux: unit16 [x]
s: struct
sx: struct [x]
sxy: struct [x], using external y count
x: uint16 x
C: Coverage
O: Offset
On: Offset (NULL)
Ox: Offset [x]
Onx: Offset (NULL) [x]
*/
FT_LOCAL_DEF( void )
otv_x_Ox( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Count;
OTV_Validate_Func func;
OTV_ENTER;
OTV_LIMIT_CHECK( 2 );
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", Count ));
OTV_LIMIT_CHECK( Count * 2 );
otvalid->nesting_level++;
func = otvalid->func[otvalid->nesting_level];
for ( ; Count > 0; Count-- )
func( table + FT_NEXT_USHORT( p ), otvalid );
otvalid->nesting_level--;
OTV_EXIT;
}
FT_LOCAL_DEF( void )
otv_u_C_x_Ox( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Count, Coverage;
OTV_Validate_Func func;
OTV_ENTER;
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 4 );
Coverage = FT_NEXT_USHORT( p );
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", Count ));
otv_Coverage_validate( table + Coverage, otvalid, (FT_Int)Count );
OTV_LIMIT_CHECK( Count * 2 );
otvalid->nesting_level++;
func = otvalid->func[otvalid->nesting_level];
for ( ; Count > 0; Count-- )
func( table + FT_NEXT_USHORT( p ), otvalid );
otvalid->nesting_level--;
OTV_EXIT;
}
/* uses otvalid->extra1 (if > 0: array value limit) */
FT_LOCAL_DEF( void )
otv_x_ux( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Count;
OTV_ENTER;
OTV_LIMIT_CHECK( 2 );
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", Count ));
OTV_LIMIT_CHECK( Count * 2 );
if ( otvalid->extra1 )
{
for ( ; Count > 0; Count-- )
if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 )
FT_INVALID_DATA;
}
OTV_EXIT;
}
/* `ux' in the function's name is not really correct since only x-1 */
/* elements are tested */
/* uses otvalid->extra1 (array value limit) */
FT_LOCAL_DEF( void )
otv_x_y_ux_sy( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Count1, Count2;
OTV_ENTER;
OTV_LIMIT_CHECK( 4 );
Count1 = FT_NEXT_USHORT( p );
Count2 = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count1 = %d)\n", Count1 ));
OTV_TRACE(( " (Count2 = %d)\n", Count2 ));
if ( Count1 == 0 )
FT_INVALID_DATA;
OTV_LIMIT_CHECK( ( Count1 - 1 ) * 2 + Count2 * 4 );
p += ( Count1 - 1 ) * 2;
for ( ; Count2 > 0; Count2-- )
{
if ( FT_NEXT_USHORT( p ) >= Count1 )
FT_INVALID_DATA;
if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 )
FT_INVALID_DATA;
}
OTV_EXIT;
}
/* `uy' in the function's name is not really correct since only y-1 */
/* elements are tested */
/* uses otvalid->extra1 (array value limit) */
FT_LOCAL_DEF( void )
otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt BacktrackCount, InputCount, LookaheadCount;
FT_UInt Count;
OTV_ENTER;
OTV_LIMIT_CHECK( 2 );
BacktrackCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (BacktrackCount = %d)\n", BacktrackCount ));
OTV_LIMIT_CHECK( BacktrackCount * 2 + 2 );
p += BacktrackCount * 2;
InputCount = FT_NEXT_USHORT( p );
if ( InputCount == 0 )
FT_INVALID_DATA;
OTV_TRACE(( " (InputCount = %d)\n", InputCount ));
OTV_LIMIT_CHECK( InputCount * 2 );
p += ( InputCount - 1 ) * 2;
LookaheadCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LookaheadCount = %d)\n", LookaheadCount ));
OTV_LIMIT_CHECK( LookaheadCount * 2 + 2 );
p += LookaheadCount * 2;
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", Count ));
OTV_LIMIT_CHECK( Count * 4 );
for ( ; Count > 0; Count-- )
{
if ( FT_NEXT_USHORT( p ) >= InputCount )
FT_INVALID_DATA;
if ( FT_NEXT_USHORT( p ) >= otvalid->extra1 )
FT_INVALID_DATA;
}
OTV_EXIT;
}
/* sets otvalid->extra1 (valid->lookup_count) */
FT_LOCAL_DEF( void )
otv_u_O_O_x_Onx( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Coverage, ClassDef, ClassSetCount;
OTV_Validate_Func func;
OTV_ENTER;
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 6 );
Coverage = FT_NEXT_USHORT( p );
ClassDef = FT_NEXT_USHORT( p );
ClassSetCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ClassSetCount = %d)\n", ClassSetCount ));
otv_Coverage_validate( table + Coverage, otvalid, -1 );
otv_ClassDef_validate( table + ClassDef, otvalid );
OTV_LIMIT_CHECK( ClassSetCount * 2 );
otvalid->nesting_level++;
func = otvalid->func[otvalid->nesting_level];
otvalid->extra1 = otvalid->lookup_count;
for ( ; ClassSetCount > 0; ClassSetCount-- )
{
FT_UInt offset = FT_NEXT_USHORT( p );
if ( offset )
func( table + offset, otvalid );
}
otvalid->nesting_level--;
OTV_EXIT;
}
/* uses otvalid->lookup_count */
FT_LOCAL_DEF( void )
otv_u_x_y_Ox_sy( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt GlyphCount, Count, count1;
OTV_ENTER;
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 4 );
GlyphCount = FT_NEXT_USHORT( p );
Count = FT_NEXT_USHORT( p );
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
OTV_TRACE(( " (Count = %d)\n", Count ));
OTV_LIMIT_CHECK( GlyphCount * 2 + Count * 4 );
for ( count1 = GlyphCount; count1 > 0; count1-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
for ( ; Count > 0; Count-- )
{
if ( FT_NEXT_USHORT( p ) >= GlyphCount )
FT_INVALID_DATA;
if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count )
FT_INVALID_DATA;
}
OTV_EXIT;
}
/* sets otvalid->extra1 (valid->lookup_count) */
FT_LOCAL_DEF( void )
otv_u_O_O_O_O_x_Onx( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt Coverage;
FT_UInt BacktrackClassDef, InputClassDef, LookaheadClassDef;
FT_UInt ChainClassSetCount;
OTV_Validate_Func func;
OTV_ENTER;
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 10 );
Coverage = FT_NEXT_USHORT( p );
BacktrackClassDef = FT_NEXT_USHORT( p );
InputClassDef = FT_NEXT_USHORT( p );
LookaheadClassDef = FT_NEXT_USHORT( p );
ChainClassSetCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (ChainClassSetCount = %d)\n", ChainClassSetCount ));
otv_Coverage_validate( table + Coverage, otvalid, -1 );
otv_ClassDef_validate( table + BacktrackClassDef, otvalid );
otv_ClassDef_validate( table + InputClassDef, otvalid );
otv_ClassDef_validate( table + LookaheadClassDef, otvalid );
OTV_LIMIT_CHECK( ChainClassSetCount * 2 );
otvalid->nesting_level++;
func = otvalid->func[otvalid->nesting_level];
otvalid->extra1 = otvalid->lookup_count;
for ( ; ChainClassSetCount > 0; ChainClassSetCount-- )
{
FT_UInt offset = FT_NEXT_USHORT( p );
if ( offset )
func( table + offset, otvalid );
}
otvalid->nesting_level--;
OTV_EXIT;
}
/* uses otvalid->lookup_count */
FT_LOCAL_DEF( void )
otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt BacktrackGlyphCount, InputGlyphCount, LookaheadGlyphCount;
FT_UInt count1, count2;
OTV_ENTER;
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 2 );
BacktrackGlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount ));
OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 );
for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
InputGlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (InputGlyphCount = %d)\n", InputGlyphCount ));
OTV_LIMIT_CHECK( InputGlyphCount * 2 + 2 );
for ( count1 = InputGlyphCount; count1 > 0; count1-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
LookaheadGlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount ));
OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 );
for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- )
otv_Coverage_validate( table + FT_NEXT_USHORT( p ), otvalid, -1 );
count2 = FT_NEXT_USHORT( p );
OTV_TRACE(( " (Count = %d)\n", count2 ));
OTV_LIMIT_CHECK( count2 * 4 );
for ( ; count2 > 0; count2-- )
{
if ( FT_NEXT_USHORT( p ) >= InputGlyphCount )
FT_INVALID_DATA;
if ( FT_NEXT_USHORT( p ) >= otvalid->lookup_count )
FT_INVALID_DATA;
}
OTV_EXIT;
}
FT_LOCAL_DEF( FT_UInt )
otv_GSUBGPOS_get_Lookup_count( FT_Bytes table )
{
FT_Bytes p = table + 8;
return otv_LookupList_get_count( table + FT_NEXT_USHORT( p ) );
}
FT_LOCAL_DEF( FT_UInt )
otv_GSUBGPOS_have_MarkAttachmentType_flag( FT_Bytes table )
{
FT_Bytes p, lookup;
FT_UInt count;
if ( !table )
return 0;
/* LookupList */
p = table + 8;
table += FT_NEXT_USHORT( p );
/* LookupCount */
p = table;
count = FT_NEXT_USHORT( p );
for ( ; count > 0; count-- )
{
FT_Bytes oldp;
/* Lookup */
lookup = table + FT_NEXT_USHORT( p );
oldp = p;
/* LookupFlag */
p = lookup + 2;
if ( FT_NEXT_USHORT( p ) & 0xFF00U )
return 1;
p = oldp;
}
return 0;
}
/* END */