projects / OpenSPARC-T2-SAM / blame
| Commit | Line | Data |
|---|---|---|
| 920dae64 AT |
1 | """ Python 'zlib_codec' Codec - zlib compression encoding |
| 2 | ||
| 3 | Unlike most of the other codecs which target Unicode, this codec | |
| 4 | will return Python string objects for both encode and decode. | |
| 5 | ||
| 6 | Written by Marc-Andre Lemburg (mal@lemburg.com). | |
| 7 | ||
| 8 | """ | |
| 9 | import codecs | |
| 10 | import zlib # this codec needs the optional zlib module ! | |
| 11 | ||
| 12 | ### Codec APIs | |
| 13 | ||
| 14 | def zlib_encode(input,errors='strict'): | |
| 15 | ||
| 16 | """ Encodes the object input and returns a tuple (output | |
| 17 | object, length consumed). | |
| 18 | ||
| 19 | errors defines the error handling to apply. It defaults to | |
| 20 | 'strict' handling which is the only currently supported | |
| 21 | error handling for this codec. | |
| 22 | ||
| 23 | """ | |
| 24 | assert errors == 'strict' | |
| 25 | output = zlib.compress(input) | |
| 26 | return (output, len(input)) | |
| 27 | ||
| 28 | def zlib_decode(input,errors='strict'): | |
| 29 | ||
| 30 | """ Decodes the object input and returns a tuple (output | |
| 31 | object, length consumed). | |
| 32 | ||
| 33 | input must be an object which provides the bf_getreadbuf | |
| 34 | buffer slot. Python strings, buffer objects and memory | |
| 35 | mapped files are examples of objects providing this slot. | |
| 36 | ||
| 37 | errors defines the error handling to apply. It defaults to | |
| 38 | 'strict' handling which is the only currently supported | |
| 39 | error handling for this codec. | |
| 40 | ||
| 41 | """ | |
| 42 | assert errors == 'strict' | |
| 43 | output = zlib.decompress(input) | |
| 44 | return (output, len(input)) | |
| 45 | ||
| 46 | class Codec(codecs.Codec): | |
| 47 | ||
| 48 | def encode(self, input, errors='strict'): | |
| 49 | return zlib_encode(input, errors) | |
| 50 | def decode(self, input, errors='strict'): | |
| 51 | return zlib_decode(input, errors) | |
| 52 | ||
| 53 | class StreamWriter(Codec,codecs.StreamWriter): | |
| 54 | pass | |
| 55 | ||
| 56 | class StreamReader(Codec,codecs.StreamReader): | |
| 57 | pass | |
| 58 | ||
| 59 | ### encodings module API | |
| 60 | ||
| 61 | def getregentry(): | |
| 62 | ||
| 63 | return (zlib_encode,zlib_decode,StreamReader,StreamWriter) |