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| 1 ######################## BEGIN LICENSE BLOCK ######################## | |
| 2 # The Original Code is Mozilla Universal charset detector code. | |
| 3 # | |
| 4 # The Initial Developer of the Original Code is | |
| 5 # Netscape Communications Corporation. | |
| 6 # Portions created by the Initial Developer are Copyright (C) 2001 | |
| 7 # the Initial Developer. All Rights Reserved. | |
| 8 # | |
| 9 # Contributor(s): | |
| 10 # Mark Pilgrim - port to Python | |
| 11 # Shy Shalom - original C code | |
| 12 # Proofpoint, Inc. | |
| 13 # | |
| 14 # This library is free software; you can redistribute it and/or | |
| 15 # modify it under the terms of the GNU Lesser General Public | |
| 16 # License as published by the Free Software Foundation; either | |
| 17 # version 2.1 of the License, or (at your option) any later version. | |
| 18 # | |
| 19 # This library is distributed in the hope that it will be useful, | |
| 20 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 22 # Lesser General Public License for more details. | |
| 23 # | |
| 24 # You should have received a copy of the GNU Lesser General Public | |
| 25 # License along with this library; if not, write to the Free Software | |
| 26 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
| 27 # 02110-1301 USA | |
| 28 ######################### END LICENSE BLOCK ######################### | |
| 29 | |
| 30 import sys | |
| 31 from . import constants | |
| 32 from .charsetprober import CharSetProber | |
| 33 | |
| 34 | |
| 35 class MultiByteCharSetProber(CharSetProber): | |
| 36 def __init__(self): | |
| 37 CharSetProber.__init__(self) | |
| 38 self._mDistributionAnalyzer = None | |
| 39 self._mCodingSM = None | |
| 40 self._mLastChar = [0, 0] | |
| 41 | |
| 42 def reset(self): | |
| 43 CharSetProber.reset(self) | |
| 44 if self._mCodingSM: | |
| 45 self._mCodingSM.reset() | |
| 46 if self._mDistributionAnalyzer: | |
| 47 self._mDistributionAnalyzer.reset() | |
| 48 self._mLastChar = [0, 0] | |
| 49 | |
| 50 def get_charset_name(self): | |
| 51 pass | |
| 52 | |
| 53 def feed(self, aBuf): | |
| 54 aLen = len(aBuf) | |
| 55 for i in range(0, aLen): | |
| 56 codingState = self._mCodingSM.next_state(aBuf[i]) | |
| 57 if codingState == constants.eError: | |
| 58 if constants._debug: | |
| 59 sys.stderr.write(self.get_charset_name() | |
| 60 + ' prober hit error at byte ' + str(i) | |
| 61 + '\n') | |
| 62 self._mState = constants.eNotMe | |
| 63 break | |
| 64 elif codingState == constants.eItsMe: | |
| 65 self._mState = constants.eFoundIt | |
| 66 break | |
| 67 elif codingState == constants.eStart: | |
| 68 charLen = self._mCodingSM.get_current_charlen() | |
| 69 if i == 0: | |
| 70 self._mLastChar[1] = aBuf[0] | |
| 71 self._mDistributionAnalyzer.feed(self._mLastChar, charLen) | |
| 72 else: | |
| 73 self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1], | |
| 74 charLen) | |
| 75 | |
| 76 self._mLastChar[0] = aBuf[aLen - 1] | |
| 77 | |
| 78 if self.get_state() == constants.eDetecting: | |
| 79 if (self._mDistributionAnalyzer.got_enough_data() and | |
| 80 (self.get_confidence() > constants.SHORTCUT_THRESHOLD)): | |
| 81 self._mState = constants.eFoundIt | |
| 82 | |
| 83 return self.get_state() | |
| 84 | |
| 85 def get_confidence(self): | |
| 86 return self._mDistributionAnalyzer.get_confidence() | |
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