Con.UBInt32("geometry_matrix_y"), Con.UBInt32("geometry_matrix_w")), Con.UBInt64("quicktime_preview"), Con.UBInt32("quicktime_still_poster"), Con.UBInt64("quicktime_selection_time"), Con.UBInt32("quicktime_current_time"), Con.UBInt32("next_track_id")) ATOM_IODS = Con.Struct( "iods", Con.Byte("version"), Con.String("flags", 3), Con.Byte("type_tag"), Con.Switch( "descriptor", lambda ctx: ctx.type_tag, { 0x10: Con.Struct( None, Con.StrictRepeater(3, Con.Byte("extended_descriptor_type")), Con.Byte("descriptor_type_length"), Con.UBInt16("OD_ID"), Con.Byte("OD_profile"), Con.Byte("scene_profile"), Con.Byte("audio_profile"), Con.Byte("video_profile"), Con.Byte("graphics_profile")), 0x0E: Con.Struct( None, Con.StrictRepeater(3, Con.Byte("extended_descriptor_type")), Con.Byte("descriptor_type_length"), Con.String("track_id", 4)) })) ATOM_TKHD = Con.Struct( "tkhd", Con.Byte("version"), Con.BitStruct("flags", Con.Padding(20), Con.Flag("TrackInPoster"), Con.Flag("TrackInPreview"), Con.Flag("TrackInMovie"), Con.Flag("TrackEnabled")), VersionLength("created_mac_UTC_date"), VersionLength("modified_mac_UTC_date"), Con.UBInt32("track_id"),
class __TIFF__(ImageMetrics): HEADER = Con.Struct('header', Con.String('byte_order', 2), Con.Switch('order', lambda ctx: ctx['byte_order'], {"II": Con.Embed( Con.Struct('little_endian', Con.Const(Con.ULInt16('version'), 42), Con.ULInt32('offset'))), "MM": Con.Embed( Con.Struct('big_endian', Con.Const(Con.UBInt16('version'), 42), Con.UBInt32('offset')))})) L_IFD = Con.Struct('ifd', Con.PrefixedArray( length_field=Con.ULInt16('length'), subcon=Con.Struct('tags', Con.ULInt16('id'), Con.ULInt16('type'), Con.ULInt32('count'), Con.ULInt32('offset'))), Con.ULInt32('next')) B_IFD = Con.Struct('ifd', Con.PrefixedArray( length_field=Con.UBInt16('length'), subcon=Con.Struct('tags', Con.UBInt16('id'), Con.UBInt16('type'), Con.UBInt32('count'), Con.UBInt32('offset'))), Con.UBInt32('next')) def __init__(self, width, height, bits_per_pixel, color_count): ImageMetrics.__init__(self, width, height, bits_per_pixel, color_count, u'image/tiff') @classmethod def b_tag_value(cls, file, tag): subtype = {1: Con.Byte("data"), 2: Con.CString("data"), 3: Con.UBInt16("data"), 4: Con.UBInt32("data"), 5: Con.Struct("data", Con.UBInt32("high"), Con.UBInt32("low"))}[tag.type] data = Con.StrictRepeater(tag.count, subtype) if ((tag.type != 2) and (data.sizeof() <= 4)): return tag.offset else: file.seek(tag.offset, 0) return data.parse_stream(file) @classmethod def l_tag_value(cls, file, tag): subtype = {1: Con.Byte("data"), 2: Con.CString("data"), 3: Con.ULInt16("data"), 4: Con.ULInt32("data"), 5: Con.Struct("data", Con.ULInt32("high"), Con.ULInt32("low"))}[tag.type] data = Con.StrictRepeater(tag.count, subtype) if ((tag.type != 2) and (data.sizeof() <= 4)): return tag.offset else: file.seek(tag.offset, 0) return data.parse_stream(file) @classmethod def parse(cls, file): width = 0 height = 0 bits_per_sample = 0 color_count = 0 try: header = cls.HEADER.parse_stream(file) if (header.byte_order == 'II'): IFD = cls.L_IFD tag_value = cls.l_tag_value elif (header.byte_order == 'MM'): IFD = cls.B_IFD tag_value = cls.b_tag_value else: raise InvalidTIFF(_(u'Invalid byte order')) file.seek(header.offset, 0) ifd = IFD.parse_stream(file) while (True): for tag in ifd.tags: if (tag.id == 0x0100): width = tag_value(file, tag) elif (tag.id == 0x0101): height = tag_value(file, tag) elif (tag.id == 0x0102): try: bits_per_sample = sum(tag_value(file, tag)) except TypeError: bits_per_sample = tag_value(file, tag) elif (tag.id == 0x0140): color_count = tag.count / 3 else: pass if (ifd.next == 0x00): break else: file.seek(ifd.next, 0) ifd = IFD.parse_stream(file) return __TIFF__(width, height, bits_per_sample, color_count) except Con.ConstError: raise InvalidTIFF(_(u'Invalid TIFF'))