code: def read_zfile(file_handle):
      """Read the z-file and return the content as a string.
  
      Z-files are raw data compressed with zlib used internally by joblib
      for persistence. Backward compatibility is not guaranteed. Do not
      use for external purposes.
      """
      file_handle.seek(0)
      header_length = len(_ZFILE_PREFIX) + _MAX_LEN
      length = file_handle.read(header_length)
      length = length[len(_ZFILE_PREFIX) :]
      length = int(length, 16)
  
      # With python2 and joblib version <= 0.8.4 compressed pickle header is one
      # character wider so we need to ignore an additional space if present.
      # Note: the first byte of the zlib data is guaranteed not to be a
      # space according to
      # https://tools.ietf.org/html/rfc6713#section-2.1
      next_byte = file_handle.read(1)
      if next_byte != b" ":
          # The zlib compressed data has started and we need to go back
          # one byte
          file_handle.seek(header_length)
  
      # We use the known length of the data to tell Zlib the size of the
      # buffer to allocate.
      data = zlib.decompress(file_handle.read(), 15, length)
      assert len(data) == length, (
          "Incorrect data length while decompressing %s."
          "The file could be corrupted." % file_handle
      )
      return data
  
imports: import pickle
  import os
  import zlib
  import inspect
  from io import BytesIO
  from .numpy_pickle_utils import _ZFILE_PREFIX
  from .numpy_pickle_utils import Unpickler
  from .numpy_pickle_utils import _ensure_native_byte_order
label_desc: Use image node_id 3 for calling a global function with example usage: read_zfile(file_handle) and returns: data