151 lines
5.0 KiB
Python
151 lines
5.0 KiB
Python
"""
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Python 'utf-32' Codec
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"""
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import codecs, sys
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### Codec APIs
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encode = codecs.utf_32_encode
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def decode(input, errors='strict'):
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return codecs.utf_32_decode(input, errors, True)
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class IncrementalEncoder(codecs.IncrementalEncoder):
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def __init__(self, errors='strict'):
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codecs.IncrementalEncoder.__init__(self, errors)
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self.encoder = None
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def encode(self, input, final=False):
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if self.encoder is None:
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result = codecs.utf_32_encode(input, self.errors)[0]
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if sys.byteorder == 'little':
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self.encoder = codecs.utf_32_le_encode
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else:
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self.encoder = codecs.utf_32_be_encode
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return result
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return self.encoder(input, self.errors)[0]
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def reset(self):
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codecs.IncrementalEncoder.reset(self)
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self.encoder = None
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def getstate(self):
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# state info we return to the caller:
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# 0: stream is in natural order for this platform
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# 2: endianness hasn't been determined yet
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# (we're never writing in unnatural order)
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return (2 if self.encoder is None else 0)
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def setstate(self, state):
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if state:
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self.encoder = None
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else:
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if sys.byteorder == 'little':
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self.encoder = codecs.utf_32_le_encode
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else:
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self.encoder = codecs.utf_32_be_encode
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class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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def __init__(self, errors='strict'):
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codecs.BufferedIncrementalDecoder.__init__(self, errors)
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self.decoder = None
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def _buffer_decode(self, input, errors, final):
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if self.decoder is None:
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(output, consumed, byteorder) = \
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codecs.utf_32_ex_decode(input, errors, 0, final)
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if byteorder == -1:
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self.decoder = codecs.utf_32_le_decode
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elif byteorder == 1:
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self.decoder = codecs.utf_32_be_decode
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elif consumed >= 4:
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raise UnicodeError("UTF-32 stream does not start with BOM")
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return (output, consumed)
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return self.decoder(input, self.errors, final)
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def reset(self):
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codecs.BufferedIncrementalDecoder.reset(self)
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self.decoder = None
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def getstate(self):
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# additional state info from the base class must be None here,
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# as it isn't passed along to the caller
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state = codecs.BufferedIncrementalDecoder.getstate(self)[0]
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# additional state info we pass to the caller:
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# 0: stream is in natural order for this platform
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# 1: stream is in unnatural order
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# 2: endianness hasn't been determined yet
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if self.decoder is None:
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return (state, 2)
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addstate = int((sys.byteorder == "big") !=
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(self.decoder is codecs.utf_32_be_decode))
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return (state, addstate)
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def setstate(self, state):
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# state[1] will be ignored by BufferedIncrementalDecoder.setstate()
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codecs.BufferedIncrementalDecoder.setstate(self, state)
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state = state[1]
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if state == 0:
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self.decoder = (codecs.utf_32_be_decode
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if sys.byteorder == "big"
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else codecs.utf_32_le_decode)
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elif state == 1:
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self.decoder = (codecs.utf_32_le_decode
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if sys.byteorder == "big"
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else codecs.utf_32_be_decode)
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else:
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self.decoder = None
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class StreamWriter(codecs.StreamWriter):
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def __init__(self, stream, errors='strict'):
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self.encoder = None
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codecs.StreamWriter.__init__(self, stream, errors)
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def reset(self):
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codecs.StreamWriter.reset(self)
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self.encoder = None
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def encode(self, input, errors='strict'):
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if self.encoder is None:
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result = codecs.utf_32_encode(input, errors)
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if sys.byteorder == 'little':
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self.encoder = codecs.utf_32_le_encode
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else:
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self.encoder = codecs.utf_32_be_encode
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return result
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else:
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return self.encoder(input, errors)
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class StreamReader(codecs.StreamReader):
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def reset(self):
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codecs.StreamReader.reset(self)
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try:
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del self.decode
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except AttributeError:
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pass
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def decode(self, input, errors='strict'):
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(object, consumed, byteorder) = \
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codecs.utf_32_ex_decode(input, errors, 0, False)
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if byteorder == -1:
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self.decode = codecs.utf_32_le_decode
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elif byteorder == 1:
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self.decode = codecs.utf_32_be_decode
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elif consumed>=4:
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raise UnicodeError,"UTF-32 stream does not start with BOM"
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return (object, consumed)
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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='utf-32',
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encode=encode,
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decode=decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamreader=StreamReader,
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streamwriter=StreamWriter,
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)
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