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from typing import List, Union |
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from .charsetprober import CharSetProber |
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from .enums import ProbingState |
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FREQ_CAT_NUM = 4 |
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UDF = 0 |
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OTH = 1 |
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ASC = 2 |
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ASS = 3 |
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ACV = 4 |
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ACO = 5 |
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ASV = 6 |
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ASO = 7 |
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CLASS_NUM = 8 |
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Latin1_CharToClass = ( |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, ASC, ASC, ASC, ASC, ASC, ASC, ASC, |
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ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, |
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ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, |
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ASC, ASC, ASC, OTH, OTH, OTH, OTH, OTH, |
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OTH, ASS, ASS, ASS, ASS, ASS, ASS, ASS, |
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ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, |
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ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, |
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ASS, ASS, ASS, OTH, OTH, OTH, OTH, OTH, |
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OTH, UDF, OTH, ASO, OTH, OTH, OTH, OTH, |
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OTH, OTH, ACO, OTH, ACO, UDF, ACO, UDF, |
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UDF, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, ASO, OTH, ASO, UDF, ASO, ACO, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, |
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ACV, ACV, ACV, ACV, ACV, ACV, ACO, ACO, |
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ACV, ACV, ACV, ACV, ACV, ACV, ACV, ACV, |
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ACO, ACO, ACV, ACV, ACV, ACV, ACV, OTH, |
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ACV, ACV, ACV, ACV, ACV, ACO, ACO, ACO, |
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ASV, ASV, ASV, ASV, ASV, ASV, ASO, ASO, |
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ASV, ASV, ASV, ASV, ASV, ASV, ASV, ASV, |
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ASO, ASO, ASV, ASV, ASV, ASV, ASV, OTH, |
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ASV, ASV, ASV, ASV, ASV, ASO, ASO, ASO, |
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) |
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Latin1ClassModel = ( |
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0, 0, 0, 0, 0, 0, 0, 0, |
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0, 3, 3, 3, 3, 3, 3, 3, |
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0, 3, 3, 3, 3, 3, 3, 3, |
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0, 3, 3, 3, 1, 1, 3, 3, |
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0, 3, 3, 3, 1, 2, 1, 2, |
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0, 3, 3, 3, 3, 3, 3, 3, |
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0, 3, 1, 3, 1, 1, 1, 3, |
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0, 3, 1, 3, 1, 1, 3, 3, |
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) |
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class Latin1Prober(CharSetProber): |
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def __init__(self) -> None: |
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super().__init__() |
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self._last_char_class = OTH |
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self._freq_counter: List[int] = [] |
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self.reset() |
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def reset(self) -> None: |
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self._last_char_class = OTH |
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self._freq_counter = [0] * FREQ_CAT_NUM |
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super().reset() |
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@property |
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def charset_name(self) -> str: |
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return "ISO-8859-1" |
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@property |
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def language(self) -> str: |
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return "" |
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def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: |
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byte_str = self.remove_xml_tags(byte_str) |
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for c in byte_str: |
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char_class = Latin1_CharToClass[c] |
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freq = Latin1ClassModel[(self._last_char_class * CLASS_NUM) + char_class] |
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if freq == 0: |
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self._state = ProbingState.NOT_ME |
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break |
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self._freq_counter[freq] += 1 |
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self._last_char_class = char_class |
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return self.state |
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def get_confidence(self) -> float: |
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if self.state == ProbingState.NOT_ME: |
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return 0.01 |
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total = sum(self._freq_counter) |
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confidence = ( |
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0.0 |
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if total < 0.01 |
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else (self._freq_counter[3] - self._freq_counter[1] * 20.0) / total |
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) |
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confidence = max(confidence, 0.0) |
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confidence *= 0.73 |
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return confidence |
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