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| ######################## BEGIN LICENSE BLOCK ######################## | |
| # The Original Code is Mozilla Universal charset detector code. | |
| # | |
| # The Initial Developer of the Original Code is | |
| # Netscape Communications Corporation. | |
| # Portions created by the Initial Developer are Copyright (C) 2001 | |
| # the Initial Developer. All Rights Reserved. | |
| # | |
| # Contributor(s): | |
| # Mark Pilgrim - port to Python | |
| # Shy Shalom - original C code | |
| # Proofpoint, Inc. | |
| # | |
| # This library is free software; you can redistribute it and/or | |
| # modify it under the terms of the GNU Lesser General Public | |
| # License as published by the Free Software Foundation; either | |
| # version 2.1 of the License, or (at your option) any later version. | |
| # | |
| # This library is distributed in the hope that it will be useful, | |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| # Lesser General Public License for more details. | |
| # | |
| # You should have received a copy of the GNU Lesser General Public | |
| # License along with this library; if not, write to the Free Software | |
| # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
| # 02110-1301 USA | |
| ######################### END LICENSE BLOCK ######################### | |
| from typing import Optional, Union | |
| from .chardistribution import CharDistributionAnalysis | |
| from .charsetprober import CharSetProber | |
| from .codingstatemachine import CodingStateMachine | |
| from .enums import LanguageFilter, MachineState, ProbingState | |
| class MultiByteCharSetProber(CharSetProber): | |
| """ | |
| MultiByteCharSetProber | |
| """ | |
| def __init__(self, lang_filter: LanguageFilter = LanguageFilter.NONE) -> None: | |
| super().__init__(lang_filter=lang_filter) | |
| self.distribution_analyzer: Optional[CharDistributionAnalysis] = None | |
| self.coding_sm: Optional[CodingStateMachine] = None | |
| self._last_char = bytearray(b"\0\0") | |
| def reset(self) -> None: | |
| super().reset() | |
| if self.coding_sm: | |
| self.coding_sm.reset() | |
| if self.distribution_analyzer: | |
| self.distribution_analyzer.reset() | |
| self._last_char = bytearray(b"\0\0") | |
| def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: | |
| assert self.coding_sm is not None | |
| assert self.distribution_analyzer is not None | |
| for i, byte in enumerate(byte_str): | |
| coding_state = self.coding_sm.next_state(byte) | |
| if coding_state == MachineState.ERROR: | |
| self.logger.debug( | |
| "%s %s prober hit error at byte %s", | |
| self.charset_name, | |
| self.language, | |
| i, | |
| ) | |
| self._state = ProbingState.NOT_ME | |
| break | |
| if coding_state == MachineState.ITS_ME: | |
| self._state = ProbingState.FOUND_IT | |
| break | |
| if coding_state == MachineState.START: | |
| char_len = self.coding_sm.get_current_charlen() | |
| if i == 0: | |
| self._last_char[1] = byte | |
| self.distribution_analyzer.feed(self._last_char, char_len) | |
| else: | |
| self.distribution_analyzer.feed(byte_str[i - 1 : i + 1], char_len) | |
| self._last_char[0] = byte_str[-1] | |
| if self.state == ProbingState.DETECTING: | |
| if self.distribution_analyzer.got_enough_data() and ( | |
| self.get_confidence() > self.SHORTCUT_THRESHOLD | |
| ): | |
| self._state = ProbingState.FOUND_IT | |
| return self.state | |
| def get_confidence(self) -> float: | |
| assert self.distribution_analyzer is not None | |
| return self.distribution_analyzer.get_confidence() | |