📄 ftobjs.c
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error = FT_Stream_Read( stream, (FT_Byte *)pfb_data + pfb_pos, rlen );
pfb_pos += rlen;
}
pfb_data[pfb_pos++] = 0x80;
pfb_data[pfb_pos++] = 3;
pfb_data[pfb_lenpos ] = (FT_Byte)( len );
pfb_data[pfb_lenpos + 1] = (FT_Byte)( len >> 8 );
pfb_data[pfb_lenpos + 2] = (FT_Byte)( len >> 16 );
pfb_data[pfb_lenpos + 3] = (FT_Byte)( len >> 24 );
return open_face_from_buffer( library,
pfb_data,
pfb_pos,
face_index,
"type1",
aface );
Exit2:
FT_FREE( pfb_data );
Exit:
return error;
}
/* The resource header says we've got resource_cnt `sfnt' */
/* (TrueType/OpenType) resources in this file. Look through */
/* them for the one indicated by face_index, load it into mem, */
/* pass it on the the truetype driver and return it. */
/* */
static FT_Error
Mac_Read_sfnt_Resource( FT_Library library,
FT_Stream stream,
FT_Long *offsets,
FT_Long resource_cnt,
FT_Long face_index,
FT_Face *aface )
{
FT_Memory memory = library->memory;
FT_Byte* sfnt_data;
FT_Error error;
FT_Long flag_offset;
FT_Long rlen;
int is_cff;
FT_Long face_index_in_resource = 0;
if ( face_index == -1 )
face_index = 0;
if ( face_index >= resource_cnt )
return FT_Err_Cannot_Open_Resource;
flag_offset = offsets[face_index];
error = FT_Stream_Seek( stream, flag_offset );
if ( error )
goto Exit;
if ( FT_READ_LONG( rlen ) )
goto Exit;
if ( rlen == -1 )
return FT_Err_Cannot_Open_Resource;
if ( FT_ALLOC( sfnt_data, (FT_Long)rlen ) )
return error;
error = FT_Stream_Read( stream, (FT_Byte *)sfnt_data, rlen );
if ( error )
goto Exit;
is_cff = rlen > 4 && sfnt_data[0] == 'O' &&
sfnt_data[1] == 'T' &&
sfnt_data[2] == 'T' &&
sfnt_data[3] == 'O';
error = open_face_from_buffer( library,
sfnt_data,
rlen,
face_index_in_resource,
is_cff ? "cff" : "truetype",
aface );
Exit:
return error;
}
/* Check for a valid resource fork header, or a valid dfont */
/* header. In a resource fork the first 16 bytes are repeated */
/* at the location specified by bytes 4-7. In a dfont bytes */
/* 4-7 point to 16 bytes of zeroes instead. */
/* */
static FT_Error
IsMacResource( FT_Library library,
FT_Stream stream,
FT_Long resource_offset,
FT_Long face_index,
FT_Face *aface )
{
FT_Memory memory = library->memory;
FT_Error error;
FT_Long map_offset, rdara_pos;
FT_Long *data_offsets;
FT_Long count;
error = FT_Raccess_Get_HeaderInfo( library, stream, resource_offset,
&map_offset, &rdara_pos );
if ( error )
return error;
error = FT_Raccess_Get_DataOffsets( library, stream,
map_offset, rdara_pos,
FT_MAKE_TAG( 'P', 'O', 'S', 'T' ),
&data_offsets, &count );
if ( !error )
{
error = Mac_Read_POST_Resource( library, stream, data_offsets, count,
face_index, aface );
FT_FREE( data_offsets );
/* POST exists in an LWFN providing a single face */
if ( !error )
(*aface)->num_faces = 1;
return error;
}
error = FT_Raccess_Get_DataOffsets( library, stream,
map_offset, rdara_pos,
FT_MAKE_TAG( 's', 'f', 'n', 't' ),
&data_offsets, &count );
if ( !error )
{
FT_Long face_index_internal = face_index % count;
error = Mac_Read_sfnt_Resource( library, stream, data_offsets, count,
face_index_internal, aface );
FT_FREE( data_offsets );
if ( !error )
(*aface)->num_faces = count;
}
return error;
}
/* Check for a valid macbinary header, and if we find one */
/* check that the (flattened) resource fork in it is valid. */
/* */
static FT_Error
IsMacBinary( FT_Library library,
FT_Stream stream,
FT_Long face_index,
FT_Face *aface )
{
unsigned char header[128];
FT_Error error;
FT_Long dlen, offset;
error = FT_Stream_Seek( stream, 0 );
if ( error )
goto Exit;
error = FT_Stream_Read( stream, (FT_Byte*)header, 128 );
if ( error )
goto Exit;
if ( header[ 0] != 0 ||
header[74] != 0 ||
header[82] != 0 ||
header[ 1] == 0 ||
header[ 1] > 33 ||
header[63] != 0 ||
header[2 + header[1]] != 0 )
return FT_Err_Unknown_File_Format;
dlen = ( header[0x53] << 24 ) |
( header[0x54] << 16 ) |
( header[0x55] << 8 ) |
header[0x56];
#if 0
rlen = ( header[0x57] << 24 ) |
( header[0x58] << 16 ) |
( header[0x59] << 8 ) |
header[0x5a];
#endif /* 0 */
offset = 128 + ( ( dlen + 127 ) & ~127 );
return IsMacResource( library, stream, offset, face_index, aface );
Exit:
return error;
}
static FT_Error
load_face_in_embedded_rfork( FT_Library library,
FT_Stream stream,
FT_Long face_index,
FT_Face *aface,
const FT_Open_Args *args )
{
#undef FT_COMPONENT
#define FT_COMPONENT trace_raccess
FT_Memory memory = library->memory;
FT_Error error = FT_Err_Unknown_File_Format;
int i;
char * file_names[FT_RACCESS_N_RULES];
FT_Long offsets[FT_RACCESS_N_RULES];
FT_Error errors[FT_RACCESS_N_RULES];
FT_Open_Args args2;
FT_Stream stream2;
FT_Raccess_Guess( library, stream,
args->pathname, file_names, offsets, errors );
for ( i = 0; i < FT_RACCESS_N_RULES; i++ )
{
if ( errors[i] )
{
FT_TRACE3(( "Error[%d] has occurred in rule %d\n", errors[i], i ));
continue;
}
args2.flags = FT_OPEN_PATHNAME;
args2.pathname = file_names[i] ? file_names[i] : args->pathname;
FT_TRACE3(( "Try rule %d: %s (offset=%d) ...",
i, args2.pathname, offsets[i] ));
error = FT_Stream_New( library, &args2, &stream2 );
if ( error )
{
FT_TRACE3(( "failed\n" ));
continue;
}
error = IsMacResource( library, stream2, offsets[i],
face_index, aface );
FT_Stream_Free( stream2, 0 );
FT_TRACE3(( "%s\n", error ? "failed": "successful" ));
if ( !error )
break;
}
for (i = 0; i < FT_RACCESS_N_RULES; i++)
{
if ( file_names[i] )
FT_FREE( file_names[i] );
}
/* Caller (load_mac_face) requires FT_Err_Unknown_File_Format. */
if ( error )
error = FT_Err_Unknown_File_Format;
return error;
#undef FT_COMPONENT
#define FT_COMPONENT trace_objs
}
/* Check for some macintosh formats. */
/* Is this a macbinary file? If so look at the resource fork. */
/* Is this a mac dfont file? */
/* Is this an old style resource fork? (in data) */
/* Else call load_face_in_embedded_rfork to try extra rules */
/* (defined in `ftrfork.c'). */
/* */
static FT_Error
load_mac_face( FT_Library library,
FT_Stream stream,
FT_Long face_index,
FT_Face *aface,
const FT_Open_Args *args )
{
FT_Error error;
FT_UNUSED( args );
error = IsMacBinary( library, stream, face_index, aface );
if ( FT_ERROR_BASE( error ) == FT_Err_Unknown_File_Format )
{
#undef FT_COMPONENT
#define FT_COMPONENT trace_raccess
FT_TRACE3(( "Try as dfont: %s ...", args->pathname ));
error = IsMacResource( library, stream, 0, face_index, aface );
FT_TRACE3(( "%s\n", error ? "failed" : "successful" ));
#undef FT_COMPONENT
#define FT_COMPONENT trace_objs
}
if ( ( FT_ERROR_BASE( error ) == FT_Err_Unknown_File_Format ||
FT_ERROR_BASE( error ) == FT_Err_Invalid_Stream_Operation ) &&
( args->flags & FT_OPEN_PATHNAME ) )
error = load_face_in_embedded_rfork( library, stream,
face_index, aface, args );
return error;
}
#endif /* !FT_MACINTOSH && FT_CONFIG_OPTION_MAC_FONTS */
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_Open_Face( FT_Library library,
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_Face face = 0;
FT_ListNode node = 0;
FT_Bool external_stream;
/* test for valid `library' delayed to */
/* FT_Stream_New() */
if ( ( !aface && face_index >= 0 ) || !args )
return FT_Err_Invalid_Argument;
external_stream = FT_BOOL( ( args->flags & FT_OPEN_STREAM ) &&
args->stream );
/* create input stream */
error = FT_Stream_New( library, args, &stream );
if ( error )
goto Exit;
memory = library->memory;
/* If the font driver is specified in the `args' structure, use */
/* it. Otherwise, we scan the list of registered drivers. */
if ( ( args->flags & FT_OPEN_DRIVER ) && args->driver )
{
driver = FT_DRIVER( args->driver );
/* not all modules are drivers, so check... */
if ( FT_MODULE_IS_DRIVER( driver ) )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
if ( args->flags & FT_OPEN_PARAMS )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
}
else
error = FT_Err_Invalid_Handle;
FT_Stream_Free( stream, external_stream );
goto Fail;
}
else
{
/* check each font driver for an appropriate format */
FT_Module* cur = library->modules;
FT_Module* limit = cur + library->num_modules;
for ( ; cur < limit; cur++ )
{
/* not all modules are font drivers, so check... */
if ( FT_MODULE_IS_DRIVER( cur[0] ) )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
driver = FT_DRIVER( cur[0] );
if ( args->flags & FT_OPEN_PARAMS )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format )
goto Fail3;
}
}
Fail3:
/* If we are on the mac, and we get an FT_Err_Invalid_Stream_Operation */
/* it may be because we have an empty data fork, so we need to check */
/* the resource fork. */
if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format &&
FT_ERROR_BASE( error ) != FT_Err_Invalid_Stream_Operation )
goto Fail2;
#if !defined( FT_MACINTOSH ) && defined( FT_CONFIG_OPTION_MAC_FONTS )
error = load_mac_face( library, stream, face_index, aface, args );
if ( !error )
{
/* We don't want to go to Success here. We've already done that. */
/* On the other hand, if we succeeded we still need to close this */
/* stream (we opened a different stream which extracted the */
/* interesting information out of this stream here. That stream */
/* will still be open and the face will point to it). */
FT_Stream_Free( stream, external_stream );
return error;
}
if ( FT_ERROR_BASE( error ) != FT_Err_Unknown_File_Format )
goto Fail2;
#endif /* !FT_MACINTOSH && FT_CONFIG_OPTION_MAC_FONTS */
/* no driver is able to handle this format */
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