imaplib2.py 文件源码

def start_compressing(self):
        """start_compressing()
        Enable deflate compression on the socket (RFC 4978)."""

        # rfc 1951 - pure DEFLATE, so use -15 for both windows
        self.decompressor = zlib.decompressobj(-15)
        self.compressor = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15)