appcfg.py 文件源码

def GetFileLength(fh):
  """Returns the length of the file represented by fh.

  This function is capable of finding the length of any seekable stream,
  unlike os.fstat, which only works on file streams.

  Args:
    fh: The stream to get the length of.

  Returns:
    The length of the stream.
  """
  pos = fh.tell()

  fh.seek(0, 2)
  length = fh.tell()
  fh.seek(pos, 0)
  return length