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"""Python 'bz2_codec' Codec - bz2 compression encoding. This codec de/encodes from bytes to bytes and is therefore usable with bytes.transform() and bytes.untransform(). Adapted by Raymond Hettinger from zlib_codec.py which was written by Marc-Andre Lemburg (mal@lemburg.com). """ import codecs import bz2 # this codec needs the optional bz2 module ! ### Codec APIs def bz2_encode(input, errors='strict'): assert errors == 'strict' return (bz2.compress(input), len(input)) def bz2_decode(input, errors='strict'): assert errors == 'strict' return (bz2.decompress(input), len(input)) class Codec(codecs.Codec): def encode(self, input, errors='strict'): return bz2_encode(input, errors) def decode(self, input, errors='strict'): return bz2_decode(input, errors) class IncrementalEncoder(codecs.IncrementalEncoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.compressobj = bz2.BZ2Compressor() 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 = bz2.BZ2Compressor() class IncrementalDecoder(codecs.IncrementalDecoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.decompressobj = bz2.BZ2Decompressor() def decode(self, input, final=False): try: return self.decompressobj.decompress(input) except EOFError: return '' def reset(self): self.decompressobj = bz2.BZ2Decompressor() class StreamWriter(Codec, codecs.StreamWriter): charbuffertype = bytes class StreamReader(Codec, codecs.StreamReader): charbuffertype = bytes ### encodings module API def getregentry(): return codecs.CodecInfo( name="bz2", encode=bz2_encode, decode=bz2_decode, incrementalencoder=IncrementalEncoder, incrementaldecoder=IncrementalDecoder, streamwriter=StreamWriter, streamreader=StreamReader, _is_text_encoding=False, )
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