author | Gareth Stockwell <gareth.stockwell@accenture.com> |
Wed, 22 Sep 2010 20:10:53 +0100 | |
branch | graphics-phase-3 |
changeset 113 | b842c0cb760e |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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""" Python 'hex_codec' Codec - 2-digit hex content transfer encoding |
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Unlike most of the other codecs which target Unicode, this codec |
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will return Python string objects for both encode and decode. |
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Written by Marc-Andre Lemburg (mal@lemburg.com). |
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""" |
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import codecs, binascii |
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### Codec APIs |
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def hex_encode(input,errors='strict'): |
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""" Encodes the object input and returns a tuple (output |
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object, length consumed). |
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errors defines the error handling to apply. It defaults to |
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'strict' handling which is the only currently supported |
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error handling for this codec. |
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""" |
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assert errors == 'strict' |
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output = binascii.b2a_hex(input) |
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return (output, len(input)) |
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def hex_decode(input,errors='strict'): |
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""" Decodes the object input and returns a tuple (output |
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object, length consumed). |
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input must be an object which provides the bf_getreadbuf |
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buffer slot. Python strings, buffer objects and memory |
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mapped files are examples of objects providing this slot. |
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errors defines the error handling to apply. It defaults to |
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'strict' handling which is the only currently supported |
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error handling for this codec. |
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""" |
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assert errors == 'strict' |
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output = binascii.a2b_hex(input) |
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return (output, len(input)) |
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class Codec(codecs.Codec): |
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def encode(self, input,errors='strict'): |
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return hex_encode(input,errors) |
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def decode(self, input,errors='strict'): |
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return hex_decode(input,errors) |
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class IncrementalEncoder(codecs.IncrementalEncoder): |
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def encode(self, input, final=False): |
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assert self.errors == 'strict' |
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return binascii.b2a_hex(input) |
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class IncrementalDecoder(codecs.IncrementalDecoder): |
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def decode(self, input, final=False): |
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assert self.errors == 'strict' |
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return binascii.a2b_hex(input) |
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class StreamWriter(Codec,codecs.StreamWriter): |
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pass |
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class StreamReader(Codec,codecs.StreamReader): |
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pass |
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### encodings module API |
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def getregentry(): |
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return codecs.CodecInfo( |
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name='hex', |
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encode=hex_encode, |
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decode=hex_decode, |
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incrementalencoder=IncrementalEncoder, |
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incrementaldecoder=IncrementalDecoder, |
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streamwriter=StreamWriter, |
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streamreader=StreamReader, |
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) |