<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _GenerateZipInfo(self, arcname=None, compress_type=None, st=None):
 """Generate ZipInfo instance for the given name, compression and stat. Args: arcname: The name in the archive this should take. compress_type: Compression type (zipfile.ZIP_DEFLATED, or ZIP_STORED) st: An optional stat object to be used for setting headers. Returns: ZipInfo instance. Raises: ValueError: If arcname is not provided. """

    # Fake stat response.
    if st is None:
      # TODO(user):pytype: stat_result typing is not correct.
      # pytype: disable=wrong-arg-count
      st = os.stat_result((0o100644, 0, 0, 0, 0, 0, 0, 0, 0, 0))
      # pytype: enable=wrong-arg-count

    mtime = time.localtime(st.st_mtime or time.time())
    date_time = mtime[0:6]
    # Create ZipInfo instance to store file information
    if arcname is None:
      raise ValueError("An arcname must be provided.")

    zinfo = zipfile.ZipInfo(arcname, date_time)
    zinfo.external_attr = (st[0] & 0xFFFF) << 16  # Unix attributes

    if compress_type is None:
      zinfo.compress_type = self._compression
    else:
      zinfo.compress_type = compress_type

    zinfo.file_size = 0
    zinfo.compress_size = 0
    zinfo.flag_bits = 0x08  # Setting data descriptor flag.
    zinfo.CRC = 0x08074b50  # Predefined CRC for archives using data
    # descriptors.
    # This fills an empty Info-ZIP Unix extra field.
    zinfo.extra = struct.pack(
        "<HHIIHH",
        0x5855,
        12,
        0,  # time of last access (UTC/GMT)
        0,  # time of last modification (UTC/GMT)
        0,  # user ID
        0)  # group ID
    return zinfo