Properly-working DEFLATE compression is elusive in Python. Thanks to wtolson, I’ve found such a solution.
This is an example framework for establishing the compression and decompression objects:
def activate_zlib(): import zlib wbits = -zlib.MAX_WBITS compress = zlib.compressobj(level, zlib.DEFLATED, wbits) compressor = lambda x: compress.compress(x) + \ compress.flush(zlib.Z_SYNC_FLUSH) decompress = zlib.decompressobj(wbits) decompressor = lambda x: decompress.decompress(x) + \ decompress.flush() return (compressor, decompressor)
With this example, you’ll pass all of your outgoing data through the compressor, and all of your incoming data to the decompressor. As always, you’ll do a read-loop until you’ve decompressed the expected number of bytes.