📄 gxvkern.c
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+ GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] )
- GXV_KERN_FMT2_DATA( array ),
"array", odtect );
gxv_odtect_validate( odtect, valid );
GXV_EXIT;
}
/* ============================= format 3 ============================== */
static void
gxv_kern_subtable_fmt3_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
FT_UShort glyphCount;
FT_Byte kernValueCount;
FT_Byte leftClassCount;
FT_Byte rightClassCount;
FT_Byte flags;
GXV_NAME_ENTER( "kern subtable format 3" );
GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 );
glyphCount = FT_NEXT_USHORT( p );
kernValueCount = FT_NEXT_BYTE( p );
leftClassCount = FT_NEXT_BYTE( p );
rightClassCount = FT_NEXT_BYTE( p );
flags = FT_NEXT_BYTE( p );
if ( valid->face->num_glyphs != glyphCount )
{
GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n",
valid->face->num_glyphs, glyphCount ));
if ( valid->root->level >= FT_VALIDATE_PARANOID )
FT_INVALID_GLYPH_ID;
}
/*
* just skip kernValue[kernValueCount]
*/
GXV_LIMIT_CHECK( 2 * kernValueCount );
p += 2 * kernValueCount;
/*
* check leftClass[gid] < leftClassCount
*/
{
FT_Byte min, max;
GXV_LIMIT_CHECK( glyphCount );
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
p += valid->subtable_length;
if ( leftClassCount < max )
FT_INVALID_DATA;
}
/*
* check rightClass[gid] < rightClassCount
*/
{
FT_Byte min, max;
GXV_LIMIT_CHECK( glyphCount );
gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
p += valid->subtable_length;
if ( rightClassCount < max )
FT_INVALID_DATA;
}
/*
* check kernIndex[i, j] < kernValueCount
*/
{
FT_UShort i, j;
for ( i = 0; i < leftClassCount; i++ )
{
for ( j = 0; j < rightClassCount; j++ )
{
GXV_LIMIT_CHECK( 1 );
if ( kernValueCount < FT_NEXT_BYTE( p ) )
FT_INVALID_OFFSET;
}
}
}
valid->subtable_length = p - table;
GXV_EXIT;
}
static FT_Bool
gxv_kern_coverage_new_apple_validate( FT_UShort coverage,
FT_UShort* format,
GXV_Validator valid )
{
/* new Apple-dialect */
FT_Bool kernVertical;
FT_Bool kernCrossStream;
FT_Bool kernVariation;
FT_UNUSED( valid );
/* reserved bits = 0 */
if ( coverage & 0x1FFC )
return 0;
kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 );
kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 );
kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 );
*format = (FT_UShort)( coverage & 0x0003 );
GXV_TRACE(( "new Apple-dialect: "
"horizontal=%d, cross-stream=%d, variation=%d, format=%d\n",
!kernVertical, kernCrossStream, kernVariation, *format ));
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
return 1;
}
static FT_Bool
gxv_kern_coverage_classic_apple_validate( FT_UShort coverage,
FT_UShort* format,
GXV_Validator valid )
{
/* classic Apple-dialect */
FT_Bool horizontal;
FT_Bool cross_stream;
/* check expected flags, but don't check if MS-dialect is impossible */
if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( valid ) )
return 0;
/* reserved bits = 0 */
if ( coverage & 0x02FC )
return 0;
horizontal = FT_BOOL( ( coverage >> 15 ) & 1 );
cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 );
*format = (FT_UShort)( coverage & 0x0003 );
GXV_TRACE(( "classic Apple-dialect: "
"horizontal=%d, cross-stream=%d, format=%d\n",
horizontal, cross_stream, *format ));
/* format 1 requires GX State Machine, too new for classic */
if ( *format == 1 )
return 0;
GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
return 1;
}
static FT_Bool
gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage,
FT_UShort* format,
GXV_Validator valid )
{
/* classic Microsoft-dialect */
FT_Bool horizontal;
FT_Bool minimum;
FT_Bool cross_stream;
FT_Bool override;
FT_UNUSED( valid );
/* reserved bits = 0 */
if ( coverage & 0xFDF0 )
return 0;
horizontal = FT_BOOL( coverage & 1 );
minimum = FT_BOOL( ( coverage >> 1 ) & 1 );
cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 );
override = FT_BOOL( ( coverage >> 3 ) & 1 );
*format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 );
GXV_TRACE(( "classic Microsoft-dialect: "
"horizontal=%d, minimum=%d, cross-stream=%d, "
"override=%d, format=%d\n",
horizontal, minimum, cross_stream, override, *format ));
if ( *format == 2 )
GXV_TRACE((
"kerning values in Microsoft format 2 subtable are ignored\n" ));
return 1;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** MAIN *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static GXV_kern_Dialect
gxv_kern_coverage_validate( FT_UShort coverage,
FT_UShort* format,
GXV_Validator valid )
{
GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN;
GXV_NAME_ENTER( "validating coverage" );
GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage ));
if ( KERN_IS_NEW( valid ) )
{
if ( gxv_kern_coverage_new_apple_validate( coverage,
format,
valid ) )
{
result = KERN_DIALECT_APPLE;
goto Exit;
}
}
if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_APPLE( valid ) )
{
if ( gxv_kern_coverage_classic_apple_validate( coverage,
format,
valid ) )
{
result = KERN_DIALECT_APPLE;
goto Exit;
}
}
if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_MS( valid ) )
{
if ( gxv_kern_coverage_classic_microsoft_validate( coverage,
format,
valid ) )
{
result = KERN_DIALECT_MS;
goto Exit;
}
}
GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" ));
Exit:
GXV_EXIT;
return result;
}
static void
gxv_kern_subtable_validate( FT_Bytes table,
FT_Bytes limit,
GXV_Validator valid )
{
FT_Bytes p = table;
FT_UShort version = 0; /* MS only: subtable version, unused */
FT_ULong length; /* MS: 16bit, Apple: 32bit*/
FT_UShort coverage;
FT_UShort tupleIndex = 0; /* Apple only */
FT_UShort u16[2];
FT_UShort format = 255; /* subtable format */
GXV_NAME_ENTER( "kern subtable" );
GXV_LIMIT_CHECK( 2 + 2 + 2 );
u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */
u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */
coverage = FT_NEXT_USHORT( p );
switch ( gxv_kern_coverage_validate( coverage, &format, valid ) )
{
case KERN_DIALECT_MS:
version = u16[0];
length = u16[1];
tupleIndex = 0;
GXV_TRACE(( "Subtable version = %d\n", version ));
GXV_TRACE(( "Subtable length = %d\n", length ));
break;
case KERN_DIALECT_APPLE:
version = 0;
length = ( u16[0] << 16 ) + u16[1];
tupleIndex = 0;
GXV_TRACE(( "Subtable length = %d\n", length ));
if ( KERN_IS_NEW( valid ) )
{
GXV_LIMIT_CHECK( 2 );
tupleIndex = FT_NEXT_USHORT( p );
GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex ));
}
break;
default:
length = u16[1];
GXV_TRACE(( "cannot detect subtable dialect, "
"just skip %d byte\n", length ));
goto Exit;
}
/* formats 1, 2, 3 require the position of the start of this subtable */
if ( format == 0 )
gxv_kern_subtable_fmt0_validate( table, table + length, valid );
else if ( format == 1 )
gxv_kern_subtable_fmt1_validate( table, table + length, valid );
else if ( format == 2 )
gxv_kern_subtable_fmt2_validate( table, table + length, valid );
else if ( format == 3 )
gxv_kern_subtable_fmt3_validate( table, table + length, valid );
else
FT_INVALID_DATA;
Exit:
valid->subtable_length = length;
GXV_EXIT;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** kern TABLE *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
static void
gxv_kern_validate_generic( FT_Bytes table,
FT_Face face,
FT_Bool classic_only,
GXV_kern_Dialect dialect_request,
FT_Validator ftvalid )
{
GXV_ValidatorRec validrec;
GXV_Validator valid = &validrec;
GXV_kern_DataRec kernrec;
GXV_kern_Data kern = &kernrec;
FT_Bytes p = table;
FT_Bytes limit = 0;
FT_ULong nTables = 0;
FT_UInt i;
valid->root = ftvalid;
valid->table_data = kern;
valid->face = face;
FT_TRACE3(( "validating `kern' table\n" ));
GXV_INIT;
KERN_DIALECT( valid ) = dialect_request;
GXV_LIMIT_CHECK( 2 );
GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p );
GXV_TRACE(( "version 0x%04x (higher 16bit)\n",
GXV_KERN_DATA( version ) ));
if ( 0x0001 < GXV_KERN_DATA( version ) )
FT_INVALID_FORMAT;
else if ( KERN_IS_CLASSIC( valid ) )
{
GXV_LIMIT_CHECK( 2 );
nTables = FT_NEXT_USHORT( p );
}
else if ( KERN_IS_NEW( valid ) )
{
if ( classic_only )
FT_INVALID_FORMAT;
if ( 0x0000 != FT_NEXT_USHORT( p ) )
FT_INVALID_FORMAT;
GXV_LIMIT_CHECK( 4 );
nTables = FT_NEXT_ULONG( p );
}
for ( i = 0; i < nTables; i++ )
{
GXV_TRACE(( "validating subtable %d/%d\n", i, nTables ));
/* p should be 32bit-aligned? */
gxv_kern_subtable_validate( p, 0, valid );
p += valid->subtable_length;
}
FT_TRACE4(( "\n" ));
}
FT_LOCAL_DEF( void )
gxv_kern_validate( FT_Bytes table,
FT_Face face,
FT_Validator ftvalid )
{
gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid );
}
FT_LOCAL_DEF( void )
gxv_kern_validate_classic( FT_Bytes table,
FT_Face face,
FT_Int dialect_flags,
FT_Validator ftvalid )
{
GXV_kern_Dialect dialect_request;
dialect_request = (GXV_kern_Dialect)dialect_flags;
gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid );
}
/* END */
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