otv_Lookup_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt LookupType, SubTableCount;
OTV_Validate_Func validate;
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 > 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 );
OTV_EXIT;
}
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;
}
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;
}
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;
}
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;
}
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;
}
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_LigatureSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "LigatureSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1:
OTV_NEST3( LigatureSubstFormat1, LigatureSet, Ligature );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
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_O_x_Ox( FT_Bytes table,
OTV_Validator valid )
{
FT_Bytes p = table;
FT_Bytes Coverage;
FT_UInt GlyphCount;
OTV_Validate_Func func;
OTV_ENTER;
OTV_LIMIT_CHECK( 4 );
Coverage = table + FT_NEXT_USHORT( p );
GlyphCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
otv_Coverage_validate( Coverage, valid, GlyphCount );
if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
FT_INVALID_DATA;
OTV_LIMIT_CHECK( GlyphCount * 2 );
valid->nesting_level++;
func = valid->func[valid->nesting_level];
valid->extra1 = 0;
for ( ; GlyphCount > 0; GlyphCount-- )
func( table + FT_NEXT_USHORT( p ), valid );
valid->nesting_level--;
OTV_EXIT;
}
static void
otv_Ligature_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt LigatureGlyph, CompCount;
OTV_ENTER;
OTV_LIMIT_CHECK( 4 );
LigatureGlyph = FT_NEXT_USHORT( p );
if ( LigatureGlyph >= otvalid->glyph_count )
FT_INVALID_DATA;
CompCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (CompCount = %d)\n", CompCount ));
if ( CompCount == 0 )
FT_INVALID_DATA;
CompCount--;
OTV_LIMIT_CHECK( CompCount * 2 ); /* Component */
/* no need to check the Component glyph indices */
OTV_EXIT;
}
static void
otv_AlternateSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "AlternateSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1:
otvalid->extra1 = otvalid->glyph_count;
OTV_NEST2( AlternateSubstFormat1, AlternateSet );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
static void
otv_MultipleSubst_validate( FT_Bytes table,
OTV_Validator valid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "MultipleSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1:
valid->extra1 = valid->glyph_count;
OTV_NEST2( MultipleSubstFormat1, Sequence );
OTV_RUN( table, valid );
break;
default:
FT_INVALID_DATA;
}
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_JstfScript_validate( FT_Bytes table,
OTV_Validator valid )
{
FT_Bytes p = table;
FT_UInt table_size;
FT_UInt JstfLangSysCount;
OTV_OPTIONAL_TABLE( ExtGlyph );
OTV_OPTIONAL_TABLE( DefJstfLangSys );
OTV_NAME_ENTER( "JstfScript" );
OTV_LIMIT_CHECK( 6 );
OTV_OPTIONAL_OFFSET( ExtGlyph );
OTV_OPTIONAL_OFFSET( DefJstfLangSys );
JstfLangSysCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount ));
table_size = JstfLangSysCount * 6 + 6;
OTV_SIZE_CHECK( ExtGlyph );
if ( ExtGlyph )
{
valid->extra1 = valid->glyph_count;
OTV_NEST1( ExtenderGlyph );
OTV_RUN( table + ExtGlyph, valid );
}
OTV_SIZE_CHECK( DefJstfLangSys );
if ( DefJstfLangSys )
{
OTV_NEST2( JstfLangSys, JstfPriority );
OTV_RUN( table + DefJstfLangSys, valid );
}
OTV_LIMIT_CHECK( 6 * JstfLangSysCount );
/* JstfLangSysRecord */
OTV_NEST2( JstfLangSys, JstfPriority );
for ( ; JstfLangSysCount > 0; JstfLangSysCount-- )
{
p += 4; /* skip JstfLangSysTag */
OTV_RUN( table + FT_NEXT_USHORT( p ), valid );
}
OTV_EXIT;
}
static void
otv_ChainContextSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "ChainContextSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
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( ChainContextSubstFormat1,
ChainSubRuleSet, ChainSubRule );
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( ChainContextSubstFormat2,
ChainSubClassSet, ChainSubClassRule );
OTV_RUN( table, otvalid );
break;
case 3:
OTV_NEST1( ChainContextSubstFormat3 );
OTV_RUN( table, otvalid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
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;
}
static void
otv_ExtensionSubst_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt SubstFormat;
OTV_NAME_ENTER( "ExtensionSubst" );
OTV_LIMIT_CHECK( 2 );
SubstFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format %d)\n", SubstFormat ));
switch ( SubstFormat )
{
case 1: /* ExtensionSubstFormat1 */
{
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 == 7 ||
ExtensionLookupType > 8 )
FT_INVALID_DATA;
validate = otvalid->type_funcs[ExtensionLookupType - 1];
validate( table + ExtensionOffset, otvalid );
}
break;
default:
FT_INVALID_FORMAT;
}
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_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_CaretValue_validate( FT_Bytes table,
OTV_Validator valid )
{
FT_Bytes p = table;
FT_UInt CaretValueFormat;
OTV_ENTER;
OTV_LIMIT_CHECK( 4 );
CaretValueFormat = FT_NEXT_USHORT( p );
OTV_TRACE(( " (format = %d)\n", CaretValueFormat ));
switch ( CaretValueFormat )
{
case 1: /* CaretValueFormat1 */
/* skip Coordinate, no test */
break;
case 2: /* CaretValueFormat2 */
/* skip CaretValuePoint, no test */
break;
case 3: /* CaretValueFormat3 */
p += 2; /* skip Coordinate */
OTV_LIMIT_CHECK( 2 );
/* DeviceTable */
otv_Device_validate( table + FT_NEXT_USHORT( p ), valid );
break;
default:
FT_INVALID_FORMAT;
}
OTV_EXIT;
}
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_MarkGlyphSets_validate( FT_Bytes table,
OTV_Validator otvalid )
{
FT_Bytes p = table;
FT_UInt MarkGlyphSetCount;
OTV_NAME_ENTER( "MarkGlyphSets" );
p += 2; /* skip Format */
OTV_LIMIT_CHECK( 2 );
MarkGlyphSetCount = FT_NEXT_USHORT( p );
OTV_TRACE(( " (MarkGlyphSetCount = %d)\n", MarkGlyphSetCount ));
OTV_LIMIT_CHECK( MarkGlyphSetCount * 4 ); /* CoverageOffsets */
for ( ; MarkGlyphSetCount > 0; MarkGlyphSetCount-- )
otv_Coverage_validate( table + FT_NEXT_ULONG( p ), otvalid, -1 );
OTV_EXIT;
}
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;
}
