static FT_Error
pcf_get_metrics( FT_Stream stream,
PCF_Face face )
{
FT_Error error = PCF_Err_Ok;
FT_Memory memory = FT_FACE(face)->memory;
FT_ULong format = 0;
FT_ULong size = 0;
PCF_Metric metrics = 0;
int i;
int nmetrics = -1;
error = pcf_seek_to_table_type( stream,
face->toc.tables,
face->toc.count,
PCF_METRICS,
&format,
&size );
if ( error )
return error;
error = FT_READ_ULONG_LE( format );
if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) &&
!PCF_FORMAT_MATCH( format, PCF_COMPRESSED_METRICS ) )
return PCF_Err_Invalid_File_Format;
if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_ULONG( nmetrics );
else
(void)FT_READ_ULONG_LE( nmetrics );
}
else
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_USHORT( nmetrics );
else
(void)FT_READ_USHORT_LE( nmetrics );
}
if ( error || nmetrics == -1 )
return PCF_Err_Invalid_File_Format;
face->nmetrics = nmetrics;
if ( FT_NEW_ARRAY( face->metrics, nmetrics ) )
return PCF_Err_Out_Of_Memory;
metrics = face->metrics;
for ( i = 0; i < nmetrics; i++ )
{
pcf_get_metric( stream, format, metrics + i );
metrics[i].bits = 0;
FT_TRACE4(( "%d : width=%d, "
"lsb=%d, rsb=%d, ascent=%d, descent=%d, swidth=%d\n",
i,
( metrics + i )->characterWidth,
( metrics + i )->leftSideBearing,
( metrics + i )->rightSideBearing,
( metrics + i )->ascent,
( metrics + i )->descent,
( metrics + i )->attributes ));
if ( error )
break;
}
if ( error )
FT_FREE( face->metrics );
return error;
}
static FT_Error
pcf_get_metrics( FT_Stream stream,
PCF_Face face )
{
FT_Error error = PCF_Err_Ok;
FT_Memory memory = FT_FACE(face)->memory;
FT_ULong format, size;
PCF_Metric metrics = 0;
FT_ULong nmetrics, i;
error = pcf_seek_to_table_type( stream,
face->toc.tables,
face->toc.count,
PCF_METRICS,
&format,
&size );
if ( error )
return error;
if ( FT_READ_ULONG_LE( format ) )
goto Bail;
if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) &&
!PCF_FORMAT_MATCH( format, PCF_COMPRESSED_METRICS ) )
return PCF_Err_Invalid_File_Format;
if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_ULONG( nmetrics );
else
(void)FT_READ_ULONG_LE( nmetrics );
}
else
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_USHORT( nmetrics );
else
(void)FT_READ_USHORT_LE( nmetrics );
}
if ( error )
return PCF_Err_Invalid_File_Format;
face->nmetrics = nmetrics;
if ( !nmetrics )
return PCF_Err_Invalid_Table;
FT_TRACE4(( "pcf_get_metrics:\n" ));
FT_TRACE4(( " number of metrics: %d\n", nmetrics ));
/* rough estimate */
if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
{
if ( nmetrics > size / PCF_METRIC_SIZE )
return PCF_Err_Invalid_Table;
}
else
{
if ( nmetrics > size / PCF_COMPRESSED_METRIC_SIZE )
return PCF_Err_Invalid_Table;
}
if ( FT_NEW_ARRAY( face->metrics, nmetrics ) )
return PCF_Err_Out_Of_Memory;
metrics = face->metrics;
for ( i = 0; i < nmetrics; i++ )
{
error = pcf_get_metric( stream, format, metrics + i );
metrics[i].bits = 0;
FT_TRACE5(( " idx %d: width=%d, "
"lsb=%d, rsb=%d, ascent=%d, descent=%d, swidth=%d\n",
i,
( metrics + i )->characterWidth,
( metrics + i )->leftSideBearing,
( metrics + i )->rightSideBearing,
( metrics + i )->ascent,
( metrics + i )->descent,
( metrics + i )->attributes ));
if ( error )
break;
}
if ( error )
FT_FREE( face->metrics );
Bail:
return error;
}
/* check and skip .gz header - we don't support `transparent' compression */
static FT_Error
ft_gzip_check_header( FT_Stream stream )
{
FT_Error error;
FT_Byte head[4];
if ( FT_STREAM_SEEK( 0 ) ||
FT_STREAM_READ( head, 4 ) )
goto Exit;
/* head[0] && head[1] are the magic numbers; */
/* head[2] is the method, and head[3] the flags */
if ( head[0] != 0x1f ||
head[1] != 0x8b ||
head[2] != Z_DEFLATED ||
(head[3] & FT_GZIP_RESERVED) )
{
error = Gzip_Err_Invalid_File_Format;
goto Exit;
}
/* skip time, xflags and os code */
(void)FT_STREAM_SKIP( 6 );
/* skip the extra field */
if ( head[3] & FT_GZIP_EXTRA_FIELD )
{
FT_UInt len;
if ( FT_READ_USHORT_LE( len ) ||
FT_STREAM_SKIP( len ) )
goto Exit;
}
/* skip original file name */
if ( head[3] & FT_GZIP_ORIG_NAME )
for (;;)
{
FT_UInt c;
if ( FT_READ_BYTE( c ) )
goto Exit;
if ( c == 0 )
break;
}
/* skip .gz comment */
if ( head[3] & FT_GZIP_COMMENT )
for (;;)
{
FT_UInt c;
if ( FT_READ_BYTE( c ) )
goto Exit;
if ( c == 0 )
break;
}
/* skip CRC */
if ( head[3] & FT_GZIP_HEAD_CRC )
if ( FT_STREAM_SKIP( 2 ) )
goto Exit;
Exit:
return error;
}
static FT_Error
pcf_get_metrics( FT_Stream stream,
PCF_Face face )
{
FT_Error error;
FT_Memory memory = FT_FACE( face )->memory;
FT_ULong format, size;
PCF_Metric metrics = NULL;
FT_ULong nmetrics, i;
error = pcf_seek_to_table_type( stream,
face->toc.tables,
face->toc.count,
PCF_METRICS,
&format,
&size );
if ( error )
return error;
if ( FT_READ_ULONG_LE( format ) )
goto Bail;
if ( !PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) &&
!PCF_FORMAT_MATCH( format, PCF_COMPRESSED_METRICS ) )
return FT_THROW( Invalid_File_Format );
if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_ULONG( nmetrics );
else
(void)FT_READ_ULONG_LE( nmetrics );
}
else
{
if ( PCF_BYTE_ORDER( format ) == MSBFirst )
(void)FT_READ_USHORT( nmetrics );
else
(void)FT_READ_USHORT_LE( nmetrics );
}
if ( error )
return FT_THROW( Invalid_File_Format );
face->nmetrics = nmetrics;
if ( !nmetrics )
return FT_THROW( Invalid_Table );
FT_TRACE4(( "pcf_get_metrics:\n" ));
FT_TRACE4(( " number of metrics: %d\n", nmetrics ));
/* rough estimate */
if ( PCF_FORMAT_MATCH( format, PCF_DEFAULT_FORMAT ) )
{
if ( nmetrics > size / PCF_METRIC_SIZE )
return FT_THROW( Invalid_Table );
}
else
{
if ( nmetrics > size / PCF_COMPRESSED_METRIC_SIZE )
return FT_THROW( Invalid_Table );
}
if ( FT_NEW_ARRAY( face->metrics, nmetrics ) )
return FT_THROW( Out_Of_Memory );
metrics = face->metrics;
for ( i = 0; i < nmetrics; i++, metrics++ )
{
error = pcf_get_metric( stream, format, metrics );
metrics->bits = 0;
FT_TRACE5(( " idx %d: width=%d, "
"lsb=%d, rsb=%d, ascent=%d, descent=%d, swidth=%d\n",
i,
metrics->characterWidth,
metrics->leftSideBearing,
metrics->rightSideBearing,
metrics->ascent,
metrics->descent,
metrics->attributes ));
if ( error )
break;
/* sanity checks -- those values are used in `PCF_Glyph_Load' to */
/* compute a glyph's bitmap dimensions, thus setting them to zero in */
/* case of an error disables this particular glyph only */
if ( metrics->rightSideBearing < metrics->leftSideBearing ||
metrics->ascent + metrics->descent < 0 )
{
metrics->characterWidth = 0;
metrics->leftSideBearing = 0;
metrics->rightSideBearing = 0;
metrics->ascent = 0;
metrics->descent = 0;
FT_TRACE0(( "pcf_get_metrics:"
" invalid metrics for glyph %d\n", i ));
}
}
if ( error )
FT_FREE( face->metrics );
Bail:
return error;
}
