| 1 | """ Python 'base64_codec' Codec - base64 content transfer encoding
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| 2 |
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| 3 | Unlike most of the other codecs which target Unicode, this codec
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| 4 | will return Python string objects for both encode and decode.
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| 5 |
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| 6 | Written by Marc-Andre Lemburg (mal@lemburg.com).
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| 7 |
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| 8 | """
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| 9 | import codecs, base64
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| 10 |
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| 11 | ### Codec APIs
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| 12 |
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| 13 | def base64_encode(input,errors='strict'):
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| 14 |
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| 15 | """ Encodes the object input and returns a tuple (output
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| 16 | object, length consumed).
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| 17 |
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| 18 | errors defines the error handling to apply. It defaults to
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| 19 | 'strict' handling which is the only currently supported
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| 20 | error handling for this codec.
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| 21 |
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| 22 | """
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| 23 | assert errors == 'strict'
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| 24 | output = base64.encodestring(input)
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| 25 | return (output, len(input))
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| 26 |
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| 27 | def base64_decode(input,errors='strict'):
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| 28 |
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| 29 | """ Decodes the object input and returns a tuple (output
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| 30 | object, length consumed).
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| 31 |
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| 32 | input must be an object which provides the bf_getreadbuf
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| 33 | buffer slot. Python strings, buffer objects and memory
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| 34 | mapped files are examples of objects providing this slot.
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| 35 |
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| 36 | errors defines the error handling to apply. It defaults to
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| 37 | 'strict' handling which is the only currently supported
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| 38 | error handling for this codec.
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| 39 |
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| 40 | """
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| 41 | assert errors == 'strict'
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| 42 | output = base64.decodestring(input)
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| 43 | return (output, len(input))
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| 44 |
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| 45 | class Codec(codecs.Codec):
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| 46 |
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| 47 | def encode(self, input,errors='strict'):
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| 48 | return base64_encode(input,errors)
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| 49 | def decode(self, input,errors='strict'):
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| 50 | return base64_decode(input,errors)
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| 51 |
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| 52 | class IncrementalEncoder(codecs.IncrementalEncoder):
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| 53 | def encode(self, input, final=False):
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| 54 | assert self.errors == 'strict'
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| 55 | return base64.encodestring(input)
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| 56 |
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| 57 | class IncrementalDecoder(codecs.IncrementalDecoder):
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| 58 | def decode(self, input, final=False):
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| 59 | assert self.errors == 'strict'
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| 60 | return base64.decodestring(input)
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| 61 |
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| 62 | class StreamWriter(Codec,codecs.StreamWriter):
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| 63 | pass
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| 64 |
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| 65 | class StreamReader(Codec,codecs.StreamReader):
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| 66 | pass
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| 67 |
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| 68 | ### encodings module API
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| 69 |
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| 70 | def getregentry():
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| 71 | return codecs.CodecInfo(
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| 72 | name='base64',
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| 73 | encode=base64_encode,
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| 74 | decode=base64_decode,
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| 75 | incrementalencoder=IncrementalEncoder,
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| 76 | incrementaldecoder=IncrementalDecoder,
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| 77 | streamwriter=StreamWriter,
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| 78 | streamreader=StreamReader,
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| 79 | )
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