code: def emulate_seek(fd, offset, chunk=CHUNK):
      
      while chunk and offset > CHUNK:
          fd.read(chunk)
          offset -= chunk
      fd.read(offset)
docs: Emulates a seek on an object that does not support it
  
      The seek is emulated by reading and discarding bytes until specified offset
      is reached.
  
      The ``offset`` argument is in bytes from start of file. The ``chunk``
      argument can be used to adjust the size of the chunks in which read
      operation is performed. Larger chunks will reach the offset in less reads
      and cost less CPU but use more memory. Conversely, smaller chunks will be
      more memory efficient, but cause more read operations and more CPU usage.
  
      If chunk is set to None, then the ``offset`` amount of bytes is read at
      once. This is fastest but depending on the offset size, may use a lot of
      memory.
  
      Default chunk size is controlled by the ``fsend.rangewrapper.CHUNK``
      constant, which is 8KB by default.
  
      This function has no return value.