"""Python 'zlib_codec' Codec - zlib compression encoding. This codec de/encodes from bytes to bytes. Written by Marc-Andre Lemburg (mal@lemburg.com). """ import codecs import zlib # this codec needs the optional zlib module ! ### Codec APIs def zlib_encode(input, errors='strict'): assert errors == 'strict' return (zlib.compress(input), len(input)) def zlib_decode(input, errors='strict'): assert errors == 'strict' return (zlib.decompress(input), len(input)) class Codec(codecs.Codec): def encode(self, input, errors='strict'): return zlib_encode(input, errors) def decode(self, input, errors='strict'): return zlib_decode(input, errors) class IncrementalEncoder(codecs.IncrementalEncoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.compressobj = zlib.compressobj() def encode(self, input, final=False): if final: c = self.compressobj.compress(input) return c + self.compressobj.flush() else: return self.compressobj.compress(input) def reset(self): self.compressobj = zlib.compressobj() class IncrementalDecoder(codecs.IncrementalDecoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.decompressobj = zlib.decompressobj() def decode(self, input, final=False): if final: c = self.decompressobj.decompress(input) return c + self.decompressobj.flush() else: return self.decompressobj.decompress(input) def reset(self): self.decompressobj = zlib.decompressobj() class StreamWriter(Codec, codecs.StreamWriter): charbuffertype = bytes class StreamReader(Codec, codecs.StreamReader): charbuffertype = bytes ### encodings module API def getregentry(): return codecs.CodecInfo( name='zlib', encode=zlib_encode, decode=zlib_decode, incrementalencoder=IncrementalEncoder, incrementaldecoder=IncrementalDecoder, streamreader=StreamReader, streamwriter=StreamWriter, _is_text_encoding=False, )