| 1 | """
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| 2 | Python 'utf-32' Codec
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| 3 | """
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| 4 | import codecs, sys
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| 5 |
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| 6 | ### Codec APIs
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| 7 |
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| 8 | encode = codecs.utf_32_encode
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| 9 |
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| 10 | def decode(input, errors='strict'):
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| 11 | return codecs.utf_32_decode(input, errors, True)
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| 12 |
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| 13 | class IncrementalEncoder(codecs.IncrementalEncoder):
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| 14 | def __init__(self, errors='strict'):
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| 15 | codecs.IncrementalEncoder.__init__(self, errors)
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| 16 | self.encoder = None
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| 17 |
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| 18 | def encode(self, input, final=False):
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| 19 | if self.encoder is None:
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| 20 | result = codecs.utf_32_encode(input, self.errors)[0]
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| 21 | if sys.byteorder == 'little':
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| 22 | self.encoder = codecs.utf_32_le_encode
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| 23 | else:
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| 24 | self.encoder = codecs.utf_32_be_encode
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| 25 | return result
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| 26 | return self.encoder(input, self.errors)[0]
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| 27 |
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| 28 | def reset(self):
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| 29 | codecs.IncrementalEncoder.reset(self)
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| 30 | self.encoder = None
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| 31 |
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| 32 | def getstate(self):
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| 33 | # state info we return to the caller:
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| 34 | # 0: stream is in natural order for this platform
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| 35 | # 2: endianness hasn't been determined yet
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| 36 | # (we're never writing in unnatural order)
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| 37 | return (2 if self.encoder is None else 0)
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| 38 |
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| 39 | def setstate(self, state):
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| 40 | if state:
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| 41 | self.encoder = None
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| 42 | else:
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| 43 | if sys.byteorder == 'little':
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| 44 | self.encoder = codecs.utf_32_le_encode
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| 45 | else:
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| 46 | self.encoder = codecs.utf_32_be_encode
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| 47 |
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| 48 | class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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| 49 | def __init__(self, errors='strict'):
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| 50 | codecs.BufferedIncrementalDecoder.__init__(self, errors)
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| 51 | self.decoder = None
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| 52 |
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| 53 | def _buffer_decode(self, input, errors, final):
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| 54 | if self.decoder is None:
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| 55 | (output, consumed, byteorder) = \
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| 56 | codecs.utf_32_ex_decode(input, errors, 0, final)
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| 57 | if byteorder == -1:
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| 58 | self.decoder = codecs.utf_32_le_decode
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| 59 | elif byteorder == 1:
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| 60 | self.decoder = codecs.utf_32_be_decode
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| 61 | elif consumed >= 4:
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| 62 | raise UnicodeError("UTF-32 stream does not start with BOM")
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| 63 | return (output, consumed)
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| 64 | return self.decoder(input, self.errors, final)
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| 65 |
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| 66 | def reset(self):
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| 67 | codecs.BufferedIncrementalDecoder.reset(self)
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| 68 | self.decoder = None
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| 69 |
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| 70 | def getstate(self):
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| 71 | # additonal state info from the base class must be None here,
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| 72 | # as it isn't passed along to the caller
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| 73 | state = codecs.BufferedIncrementalDecoder.getstate(self)[0]
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| 74 | # additional state info we pass to the caller:
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| 75 | # 0: stream is in natural order for this platform
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| 76 | # 1: stream is in unnatural order
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| 77 | # 2: endianness hasn't been determined yet
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| 78 | if self.decoder is None:
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| 79 | return (state, 2)
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| 80 | addstate = int((sys.byteorder == "big") !=
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| 81 | (self.decoder is codecs.utf_32_be_decode))
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| 82 | return (state, addstate)
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| 83 |
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| 84 | def setstate(self, state):
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| 85 | # state[1] will be ignored by BufferedIncrementalDecoder.setstate()
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| 86 | codecs.BufferedIncrementalDecoder.setstate(self, state)
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| 87 | state = state[1]
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| 88 | if state == 0:
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| 89 | self.decoder = (codecs.utf_32_be_decode
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| 90 | if sys.byteorder == "big"
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| 91 | else codecs.utf_32_le_decode)
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| 92 | elif state == 1:
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| 93 | self.decoder = (codecs.utf_32_le_decode
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| 94 | if sys.byteorder == "big"
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| 95 | else codecs.utf_32_be_decode)
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| 96 | else:
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| 97 | self.decoder = None
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| 98 |
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| 99 | class StreamWriter(codecs.StreamWriter):
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| 100 | def __init__(self, stream, errors='strict'):
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| 101 | self.encoder = None
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| 102 | codecs.StreamWriter.__init__(self, stream, errors)
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| 103 |
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| 104 | def reset(self):
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| 105 | codecs.StreamWriter.reset(self)
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| 106 | self.encoder = None
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| 107 |
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| 108 | def encode(self, input, errors='strict'):
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| 109 | if self.encoder is None:
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| 110 | result = codecs.utf_32_encode(input, errors)
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| 111 | if sys.byteorder == 'little':
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| 112 | self.encoder = codecs.utf_32_le_encode
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| 113 | else:
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| 114 | self.encoder = codecs.utf_32_be_encode
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| 115 | return result
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| 116 | else:
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| 117 | return self.encoder(input, errors)
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| 118 |
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| 119 | class StreamReader(codecs.StreamReader):
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| 120 |
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| 121 | def reset(self):
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| 122 | codecs.StreamReader.reset(self)
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| 123 | try:
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| 124 | del self.decode
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| 125 | except AttributeError:
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| 126 | pass
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| 127 |
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| 128 | def decode(self, input, errors='strict'):
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| 129 | (object, consumed, byteorder) = \
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| 130 | codecs.utf_32_ex_decode(input, errors, 0, False)
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| 131 | if byteorder == -1:
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| 132 | self.decode = codecs.utf_32_le_decode
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| 133 | elif byteorder == 1:
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| 134 | self.decode = codecs.utf_32_be_decode
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| 135 | elif consumed>=4:
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| 136 | raise UnicodeError,"UTF-32 stream does not start with BOM"
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| 137 | return (object, consumed)
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| 138 |
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| 139 | ### encodings module API
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| 140 |
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| 141 | def getregentry():
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| 142 | return codecs.CodecInfo(
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| 143 | name='utf-32',
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| 144 | encode=encode,
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| 145 | decode=decode,
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| 146 | incrementalencoder=IncrementalEncoder,
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| 147 | incrementaldecoder=IncrementalDecoder,
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| 148 | streamreader=StreamReader,
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| 149 | streamwriter=StreamWriter,
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| 150 | )
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