projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3257aa99 DM |
1 | """ Python 'bz2_codec' Codec - bz2 compression encoding\r |
| 2 | \r | |
| 3 | Unlike most of the other codecs which target Unicode, this codec\r | |
| 4 | will return Python string objects for both encode and decode.\r | |
| 5 | \r | |
| 6 | Adapted by Raymond Hettinger from zlib_codec.py which was written\r | |
| 7 | by Marc-Andre Lemburg (mal@lemburg.com).\r | |
| 8 | \r | |
| 9 | """\r | |
| 10 | import codecs\r | |
| 11 | import bz2 # this codec needs the optional bz2 module !\r | |
| 12 | \r | |
| 13 | ### Codec APIs\r | |
| 14 | \r | |
| 15 | def bz2_encode(input,errors='strict'):\r | |
| 16 | \r | |
| 17 | """ Encodes the object input and returns a tuple (output\r | |
| 18 | object, length consumed).\r | |
| 19 | \r | |
| 20 | errors defines the error handling to apply. It defaults to\r | |
| 21 | 'strict' handling which is the only currently supported\r | |
| 22 | error handling for this codec.\r | |
| 23 | \r | |
| 24 | """\r | |
| 25 | assert errors == 'strict'\r | |
| 26 | output = bz2.compress(input)\r | |
| 27 | return (output, len(input))\r | |
| 28 | \r | |
| 29 | def bz2_decode(input,errors='strict'):\r | |
| 30 | \r | |
| 31 | """ Decodes the object input and returns a tuple (output\r | |
| 32 | object, length consumed).\r | |
| 33 | \r | |
| 34 | input must be an object which provides the bf_getreadbuf\r | |
| 35 | buffer slot. Python strings, buffer objects and memory\r | |
| 36 | mapped files are examples of objects providing this slot.\r | |
| 37 | \r | |
| 38 | errors defines the error handling to apply. It defaults to\r | |
| 39 | 'strict' handling which is the only currently supported\r | |
| 40 | error handling for this codec.\r | |
| 41 | \r | |
| 42 | """\r | |
| 43 | assert errors == 'strict'\r | |
| 44 | output = bz2.decompress(input)\r | |
| 45 | return (output, len(input))\r | |
| 46 | \r | |
| 47 | class Codec(codecs.Codec):\r | |
| 48 | \r | |
| 49 | def encode(self, input, errors='strict'):\r | |
| 50 | return bz2_encode(input, errors)\r | |
| 51 | def decode(self, input, errors='strict'):\r | |
| 52 | return bz2_decode(input, errors)\r | |
| 53 | \r | |
| 54 | class IncrementalEncoder(codecs.IncrementalEncoder):\r | |
| 55 | def __init__(self, errors='strict'):\r | |
| 56 | assert errors == 'strict'\r | |
| 57 | self.errors = errors\r | |
| 58 | self.compressobj = bz2.BZ2Compressor()\r | |
| 59 | \r | |
| 60 | def encode(self, input, final=False):\r | |
| 61 | if final:\r | |
| 62 | c = self.compressobj.compress(input)\r | |
| 63 | return c + self.compressobj.flush()\r | |
| 64 | else:\r | |
| 65 | return self.compressobj.compress(input)\r | |
| 66 | \r | |
| 67 | def reset(self):\r | |
| 68 | self.compressobj = bz2.BZ2Compressor()\r | |
| 69 | \r | |
| 70 | class IncrementalDecoder(codecs.IncrementalDecoder):\r | |
| 71 | def __init__(self, errors='strict'):\r | |
| 72 | assert errors == 'strict'\r | |
| 73 | self.errors = errors\r | |
| 74 | self.decompressobj = bz2.BZ2Decompressor()\r | |
| 75 | \r | |
| 76 | def decode(self, input, final=False):\r | |
| 77 | try:\r | |
| 78 | return self.decompressobj.decompress(input)\r | |
| 79 | except EOFError:\r | |
| 80 | return ''\r | |
| 81 | \r | |
| 82 | def reset(self):\r | |
| 83 | self.decompressobj = bz2.BZ2Decompressor()\r | |
| 84 | \r | |
| 85 | class StreamWriter(Codec,codecs.StreamWriter):\r | |
| 86 | pass\r | |
| 87 | \r | |
| 88 | class StreamReader(Codec,codecs.StreamReader):\r | |
| 89 | pass\r | |
| 90 | \r | |
| 91 | ### encodings module API\r | |
| 92 | \r | |
| 93 | def getregentry():\r | |
| 94 | return codecs.CodecInfo(\r | |
| 95 | name="bz2",\r | |
| 96 | encode=bz2_encode,\r | |
| 97 | decode=bz2_decode,\r | |
| 98 | incrementalencoder=IncrementalEncoder,\r | |
| 99 | incrementaldecoder=IncrementalDecoder,\r | |
| 100 | streamwriter=StreamWriter,\r | |
| 101 | streamreader=StreamReader,\r | |
| 102 | )\r |