How to use the mutagen._util.cdata function in mutagen

def zlib_int(*args):
            return cdata.int_be(cdata.to_uint_be(old_crc(*args) & 0xffffffff))

def load(self, fileobj, errors='replace', framing=True):
        """Parse a Vorbis comment from a file-like object.

        Keyword arguments:
        errors:
          'strict', 'replace', or 'ignore'. This affects Unicode decoding
          and how other malformed content is interpreted.
        framing -- if true, fail if a framing bit is not present

        Framing bits are required by the Vorbis comment specification,
        but are not used in FLAC Vorbis comment blocks.

        """
        try:
            vendor_length = cdata.uint_le(fileobj.read(4))
            self.vendor = fileobj.read(vendor_length).decode('utf-8', errors)
            count = cdata.uint_le(fileobj.read(4))
            for i in range(count):
                length = cdata.uint_le(fileobj.read(4))
                try: string = fileobj.read(length).decode('utf-8', errors)
                except (OverflowError, MemoryError):
                    raise error("cannot read %d bytes, too large" % length)
                try: tag, value = string.split('=', 1)
                except ValueError, err:
                    if errors == "ignore":
                        continue
                    elif errors == "replace":
                        tag, value = u"unknown%d" % i, string
                    else:
                        raise VorbisEncodingError, str(err), sys.exc_info()[2]
                try: tag = tag.encode('ascii', errors)

lacing_data = []
        for datum in self.packets:
            quot, rem = divmod(len(datum), 255)
            lacing_data.append(b"\xff" * quot + chr_(rem))
        lacing_data = b"".join(lacing_data)
        if not self.complete and lacing_data.endswith(b"\x00"):
            lacing_data = lacing_data[:-1]
        data.append(chr_(len(lacing_data)))
        data.append(lacing_data)
        data.extend(self.packets)
        data = b"".join(data)

        # Python's CRC is swapped relative to Ogg's needs.
        # crc32 returns uint prior to py2.6 on some platforms, so force uint
        crc = (~zlib.crc32(data.translate(cdata.bitswap), -1)) & 0xffffffff
        # Although we're using to_uint_be, this actually makes the CRC
        # a proper le integer, since Python's CRC is byteswapped.
        crc = cdata.to_uint_be(crc).translate(cdata.bitswap)
        data = data[:22] + crc + data[26:]
        return data

lacing_data = []
        for datum in self.packets:
            quot, rem = divmod(len(datum), 255)
            lacing_data.append(b"\xff" * quot + bchr(rem))
        lacing_data = b"".join(lacing_data)
        if not self.complete and lacing_data.endswith(b"\x00"):
            lacing_data = lacing_data[:-1]
        data.append(bchr(len(lacing_data)))
        data.append(lacing_data)
        data.extend(self.packets)
        data = b"".join(data)

        # Python's CRC is swapped relative to Ogg's needs.
        # crc32 returns uint prior to py2.6 on some platforms, so force uint
        crc = (~zlib.crc32(data.translate(cdata.bitswap), -1)) & 0xffffffff
        # Although we're using to_uint_be, this actually makes the CRC
        # a proper le integer, since Python's CRC is byteswapped.
        crc = cdata.to_uint_be(crc).translate(cdata.bitswap)
        data = data[:22] + crc + data[26:]
        return data

self.album_peak /= 65535.0

            self.sample_rate = RATES[(flags >> 16) & 0x0003]
            self.bitrate = 0
        # SV4-SV6
        else:
            header_dword = cdata.uint_le(header[0:4])
            self.version = (header_dword >> 11) & 0x03FF
            if self.version < 4 or self.version > 6:
                raise MusepackHeaderError("not a Musepack file")
            self.bitrate = (header_dword >> 23) & 0x01FF
            self.sample_rate = 44100
            if self.version >= 5:
                frames = cdata.uint_le(header[4:8])
            else:
                frames = cdata.ushort_le(header[6:8])
            if self.version < 6:
                frames -= 1
        self.channels = 2
        self.length = float(frames * 1152 - 576) / self.sample_rate

def __init__(self, fileobj):
        page = OggPage(fileobj)
        while not page.packets[0].startswith("Speex   "):
            page = OggPage(fileobj)
        if not page.first:
            raise OggSpeexHeaderError(
                "page has ID header, but doesn't start a stream")
        self.sample_rate = cdata.uint_le(page.packets[0][36:40])
        self.channels = cdata.uint_le(page.packets[0][48:52])
        self.bitrate = max(0, cdata.int_le(page.packets[0][52:56]))
        self.serial = page.serial

quot, rem = divmod(len(datum), 255)
            lacing_data.append(b"\xff" * quot + chr_(rem))
        lacing_data = b"".join(lacing_data)
        if not self.complete and lacing_data.endswith(b"\x00"):
            lacing_data = lacing_data[:-1]
        data.append(chr_(len(lacing_data)))
        data.append(lacing_data)
        data.extend(self.packets)
        data = b"".join(data)

        # Python's CRC is swapped relative to Ogg's needs.
        # crc32 returns uint prior to py2.6 on some platforms, so force uint
        crc = (~zlib.crc32(data.translate(cdata.bitswap), -1)) & 0xffffffff
        # Although we're using to_uint_be, this actually makes the CRC
        # a proper le integer, since Python's CRC is byteswapped.
        crc = cdata.to_uint_be(crc).translate(cdata.bitswap)
        data = data[:22] + crc + data[26:]
        return data

def __init__(self, fileobj, offset):
        """Raises TrueAudioHeaderError"""

        fileobj.seek(offset or 0)
        header = fileobj.read(18)
        if len(header) != 18 or not header.startswith(b"TTA"):
            raise TrueAudioHeaderError("TTA header not found")
        self.sample_rate = cdata.int_le(header[10:14])
        samples = cdata.uint_le(header[14:18])
        self.length = float(samples) / self.sample_rate

else:
                        reraise(VorbisEncodingError, err, sys.exc_info()[2])
                try:
                    tag = tag.encode('ascii', errors)
                except UnicodeEncodeError:
                    raise VorbisEncodingError("invalid tag name %r" % tag)
                else:
                    # string keys in py3k
                    if PY3:
                        tag = tag.decode("ascii")
                    if is_valid_key(tag):
                        self.append((tag, value))

            if framing and not bytearray(fileobj.read(1))[0] & 0x01:
                raise VorbisUnsetFrameError("framing bit was unset")
        except (cdata.error, TypeError):
            raise error("file is not a valid Vorbis comment")