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 | # additional 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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