0,0 → 1,1086 |
/***************************************************************************/ |
/* */ |
/* otvcommn.c */ |
/* */ |
/* OpenType common tables validation (body). */ |
/* */ |
/* Copyright 2004, 2005, 2006, 2007 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. */ |
/* */ |
/***************************************************************************/ |
|
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#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 valid, |
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 )); |
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OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */ |
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for ( i = 0; i < GlyphCount; ++i ) |
{ |
FT_UInt gid; |
|
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gid = FT_NEXT_USHORT( p ); |
if ( gid >= valid->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 >= valid->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; |
|
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p += 4; /* skip CoverageFormat and Glyph/RangeCount */ |
|
return FT_NEXT_USHORT( p ); |
} |
|
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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; |
} |
|
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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; |
|
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switch ( CoverageFormat ) |
{ |
case 1: |
return count; |
|
case 2: |
{ |
FT_UInt Start, End; |
|
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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; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** CLASS DEFINITION TABLE *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
FT_LOCAL_DEF( void ) |
otv_ClassDef_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt ClassFormat; |
|
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OTV_NAME_ENTER( "ClassDef" ); |
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OTV_LIMIT_CHECK( 4 ); |
ClassFormat = FT_NEXT_USHORT( p ); |
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OTV_TRACE(( " (format %d)\n", ClassFormat )); |
|
switch ( ClassFormat ) |
{ |
case 1: /* ClassDefFormat1 */ |
{ |
FT_UInt StartGlyph; |
FT_UInt GlyphCount; |
|
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OTV_LIMIT_CHECK( 4 ); |
|
StartGlyph = FT_NEXT_USHORT( p ); |
GlyphCount = FT_NEXT_USHORT( p ); |
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OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
|
OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */ |
|
if ( StartGlyph + GlyphCount - 1 >= valid->glyph_count ) |
FT_INVALID_GLYPH_ID; |
} |
break; |
|
case 2: /* ClassDefFormat2 */ |
{ |
FT_UInt n, ClassRangeCount; |
FT_UInt Start, End, last = 0; |
|
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ClassRangeCount = FT_NEXT_USHORT( p ); |
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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 >= valid->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; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** DEVICE TABLE *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
FT_LOCAL_DEF( void ) |
otv_Device_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt StartSize, EndSize, DeltaFormat, count; |
|
|
OTV_NAME_ENTER( "Device" ); |
|
OTV_LIMIT_CHECK( 8 ); |
StartSize = FT_NEXT_USHORT( p ); |
EndSize = FT_NEXT_USHORT( p ); |
DeltaFormat = FT_NEXT_USHORT( p ); |
|
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; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** LOOKUPS *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
/* uses valid->type_count */ |
/* uses valid->type_funcs */ |
|
FT_LOCAL_DEF( void ) |
otv_Lookup_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt LookupType, SubTableCount; |
OTV_Validate_Func validate; |
|
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OTV_NAME_ENTER( "Lookup" ); |
|
OTV_LIMIT_CHECK( 6 ); |
LookupType = FT_NEXT_USHORT( p ); |
p += 2; /* skip LookupFlag */ |
SubTableCount = FT_NEXT_USHORT( p ); |
|
OTV_TRACE(( " (type %d)\n", LookupType )); |
|
if ( LookupType == 0 || LookupType > valid->type_count ) |
FT_INVALID_DATA; |
|
validate = valid->type_funcs[LookupType - 1]; |
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OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount )); |
|
OTV_LIMIT_CHECK( SubTableCount * 2 ); |
|
/* SubTable */ |
for ( ; SubTableCount > 0; SubTableCount-- ) |
validate( table + FT_NEXT_USHORT( p ), valid ); |
|
OTV_EXIT; |
} |
|
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/* uses valid->lookup_count */ |
|
FT_LOCAL_DEF( void ) |
otv_LookupList_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt LookupCount; |
|
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OTV_NAME_ENTER( "LookupList" ); |
|
OTV_LIMIT_CHECK( 2 ); |
LookupCount = FT_NEXT_USHORT( p ); |
|
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
|
OTV_LIMIT_CHECK( LookupCount * 2 ); |
|
valid->lookup_count = LookupCount; |
|
/* Lookup */ |
for ( ; LookupCount > 0; LookupCount-- ) |
otv_Lookup_validate( table + FT_NEXT_USHORT( p ), valid ); |
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OTV_EXIT; |
} |
|
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static FT_UInt |
otv_LookupList_get_count( FT_Bytes table ) |
{ |
return FT_NEXT_USHORT( table ); |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** FEATURES *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
/* uses valid->lookup_count */ |
|
FT_LOCAL_DEF( void ) |
otv_Feature_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt LookupCount; |
|
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OTV_NAME_ENTER( "Feature" ); |
|
OTV_LIMIT_CHECK( 4 ); |
p += 2; /* skip FeatureParams (unused) */ |
LookupCount = FT_NEXT_USHORT( p ); |
|
OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
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OTV_LIMIT_CHECK( LookupCount * 2 ); |
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/* LookupListIndex */ |
for ( ; LookupCount > 0; LookupCount-- ) |
if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
FT_INVALID_DATA; |
|
OTV_EXIT; |
} |
|
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static FT_UInt |
otv_Feature_get_count( FT_Bytes table ) |
{ |
return FT_NEXT_USHORT( table ); |
} |
|
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/* sets valid->lookup_count */ |
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FT_LOCAL_DEF( void ) |
otv_FeatureList_validate( FT_Bytes table, |
FT_Bytes lookups, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt FeatureCount; |
|
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OTV_NAME_ENTER( "FeatureList" ); |
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OTV_LIMIT_CHECK( 2 ); |
FeatureCount = FT_NEXT_USHORT( p ); |
|
OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
|
OTV_LIMIT_CHECK( FeatureCount * 2 ); |
|
valid->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 ), valid ); |
} |
|
OTV_EXIT; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** LANGUAGE SYSTEM *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
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/* uses valid->extra1 (number of features) */ |
|
FT_LOCAL_DEF( void ) |
otv_LangSys_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_Bytes p = table; |
FT_UInt ReqFeatureIndex; |
FT_UInt FeatureCount; |
|
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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 >= valid->extra1 ) |
FT_INVALID_DATA; |
|
OTV_LIMIT_CHECK( FeatureCount * 2 ); |
|
/* FeatureIndex */ |
for ( ; FeatureCount > 0; FeatureCount-- ) |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
FT_INVALID_DATA; |
|
OTV_EXIT; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** SCRIPTS *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
FT_LOCAL_DEF( void ) |
otv_Script_validate( FT_Bytes table, |
OTV_Validator valid ) |
{ |
FT_UInt DefaultLangSys, LangSysCount; |
FT_Bytes p = table; |
|
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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, valid ); |
|
OTV_LIMIT_CHECK( LangSysCount * 6 ); |
|
/* LangSysRecord */ |
for ( ; LangSysCount > 0; LangSysCount-- ) |
{ |
p += 4; /* skip LangSysTag */ |
|
/* LangSys */ |
otv_LangSys_validate( table + FT_NEXT_USHORT( p ), valid ); |
} |
|
OTV_EXIT; |
} |
|
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/* sets valid->extra1 (number of features) */ |
|
FT_LOCAL_DEF( void ) |
otv_ScriptList_validate( FT_Bytes table, |
FT_Bytes features, |
OTV_Validator valid ) |
{ |
FT_UInt ScriptCount; |
FT_Bytes p = table; |
|
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OTV_NAME_ENTER( "ScriptList" ); |
|
OTV_LIMIT_CHECK( 2 ); |
ScriptCount = FT_NEXT_USHORT( p ); |
|
OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount )); |
|
OTV_LIMIT_CHECK( ScriptCount * 6 ); |
|
valid->extra1 = otv_Feature_get_count( features ); |
|
/* ScriptRecord */ |
for ( ; ScriptCount > 0; ScriptCount-- ) |
{ |
p += 4; /* skip ScriptTag */ |
|
otv_Script_validate( table + FT_NEXT_USHORT( p ), valid ); /* Script */ |
} |
|
OTV_EXIT; |
} |
|
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/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** 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 valid ) |
{ |
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 ); |
|
valid->nesting_level++; |
func = valid->func[valid->nesting_level]; |
|
for ( ; Count > 0; Count-- ) |
func( table + FT_NEXT_USHORT( p ), valid ); |
|
valid->nesting_level--; |
|
OTV_EXIT; |
} |
|
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FT_LOCAL_DEF( void ) |
otv_u_C_x_Ox( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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, valid, Count ); |
|
OTV_LIMIT_CHECK( Count * 2 ); |
|
valid->nesting_level++; |
func = valid->func[valid->nesting_level]; |
|
for ( ; Count > 0; Count-- ) |
func( table + FT_NEXT_USHORT( p ), valid ); |
|
valid->nesting_level--; |
|
OTV_EXIT; |
} |
|
|
/* uses valid->extra1 (if > 0: array value limit) */ |
|
FT_LOCAL_DEF( void ) |
otv_x_ux( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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 ( valid->extra1 ) |
{ |
for ( ; Count > 0; Count-- ) |
if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
FT_INVALID_DATA; |
} |
|
OTV_EXIT; |
} |
|
|
/* `ux' in the function's name is not really correct since only x-1 */ |
/* elements are tested */ |
|
/* uses valid->extra1 (array value limit) */ |
|
FT_LOCAL_DEF( void ) |
otv_x_y_ux_sy( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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 ) >= valid->extra1 ) |
FT_INVALID_DATA; |
} |
|
OTV_EXIT; |
} |
|
|
/* `uy' in the function's name is not really correct since only y-1 */ |
/* elements are tested */ |
|
/* uses valid->extra1 (array value limit) */ |
|
FT_LOCAL_DEF( void ) |
otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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 ) >= valid->extra1 ) |
FT_INVALID_DATA; |
} |
|
OTV_EXIT; |
} |
|
|
/* sets valid->extra1 (valid->lookup_count) */ |
|
FT_LOCAL_DEF( void ) |
otv_u_O_O_x_Onx( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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, valid, -1 ); |
otv_ClassDef_validate( table + ClassDef, valid ); |
|
OTV_LIMIT_CHECK( ClassSetCount * 2 ); |
|
valid->nesting_level++; |
func = valid->func[valid->nesting_level]; |
valid->extra1 = valid->lookup_count; |
|
for ( ; ClassSetCount > 0; ClassSetCount-- ) |
{ |
FT_UInt offset = FT_NEXT_USHORT( p ); |
|
|
if ( offset ) |
func( table + offset, valid ); |
} |
|
valid->nesting_level--; |
|
OTV_EXIT; |
} |
|
|
/* uses valid->lookup_count */ |
|
FT_LOCAL_DEF( void ) |
otv_u_x_y_Ox_sy( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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 ), valid, -1 ); |
|
for ( ; Count > 0; Count-- ) |
{ |
if ( FT_NEXT_USHORT( p ) >= GlyphCount ) |
FT_INVALID_DATA; |
|
if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
FT_INVALID_DATA; |
} |
|
OTV_EXIT; |
} |
|
|
/* sets valid->extra1 (valid->lookup_count) */ |
|
FT_LOCAL_DEF( void ) |
otv_u_O_O_O_O_x_Onx( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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, valid, -1 ); |
|
otv_ClassDef_validate( table + BacktrackClassDef, valid ); |
otv_ClassDef_validate( table + InputClassDef, valid ); |
otv_ClassDef_validate( table + LookaheadClassDef, valid ); |
|
OTV_LIMIT_CHECK( ChainClassSetCount * 2 ); |
|
valid->nesting_level++; |
func = valid->func[valid->nesting_level]; |
valid->extra1 = valid->lookup_count; |
|
for ( ; ChainClassSetCount > 0; ChainClassSetCount-- ) |
{ |
FT_UInt offset = FT_NEXT_USHORT( p ); |
|
|
if ( offset ) |
func( table + offset, valid ); |
} |
|
valid->nesting_level--; |
|
OTV_EXIT; |
} |
|
|
/* uses valid->lookup_count */ |
|
FT_LOCAL_DEF( void ) |
otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table, |
OTV_Validator valid ) |
{ |
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 ), valid, -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 ), valid, -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 ), valid, -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 ) >= valid->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 */ |