code: def read(self, size=-1):
      if size < 0:
          return self.readall()
      # size=0 is special because decompress(max_length=0) is not supported
      if not size:
          return b""
  
      # For certain input data, a single
      # call to decompress() may not return
      # any data. In this case, retry until we get some data or reach EOF.
      while True:
          if self._decompressor.eof:
              # Ending case: we've come to the end of a member in the file,
              # so finish up this member, and read a new gzip header.
              # Check the CRC and file size, and set the flag so we read
              # a new member
              self._read_eof()
              self._new_member = True
              self._decompressor = self._decomp_factory(
                  **self._decomp_args
              )
  
          if self._new_member:
              # If the _new_member flag is set, we have to
              # jump to the next member, if there is one.
              self._init_read()
              if not self._read_gzip_header():
                  self._size = self._pos
                  return b""
              self._new_member = False
  
          # Read a chunk of data from the file
          buf = self._fp.read(io.DEFAULT_BUFFER_SIZE)
  
          uncompress = self._decompressor.decompress(buf, size)
          if self._decompressor.unconsumed_tail != b"":
              self._fp.prepend(self._decompressor.unconsumed_tail)
          elif self._decompressor.unused_data != b"":
              # Prepend the already read bytes to the fileobj so they can
              # be seen by _read_eof() and _read_gzip_header()
              self._fp.prepend(self._decompressor.unused_data)
  
          if uncompress != b"":
              break
          if buf == b"":
              raise EOFError(
                  "Compressed file ended before the "
                  "end-of-stream marker was reached"
              )
  
      self._add_read_data(uncompress)
      self._pos += len(uncompress)
      return uncompress
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 4 for calling the _GzipReader obj's underlying member method code with example usage: obj.read(size) and returns: uncompress, self, bytes, bytes