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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 #########################
- import sys
- from . import constants
- from .charsetprober import CharSetProber
- class MultiByteCharSetProber(CharSetProber):
- def __init__(self):
- CharSetProber.__init__(self)
- self._mDistributionAnalyzer = None
- self._mCodingSM = None
- self._mLastChar = [0, 0]
- def reset(self):
- CharSetProber.reset(self)
- if self._mCodingSM:
- self._mCodingSM.reset()
- if self._mDistributionAnalyzer:
- self._mDistributionAnalyzer.reset()
- self._mLastChar = [0, 0]
- def get_charset_name(self):
- pass
- def feed(self, aBuf):
- aLen = len(aBuf)
- for i in range(0, aLen):
- codingState = self._mCodingSM.next_state(aBuf[i])
- if codingState == constants.eError:
- if constants._debug:
- sys.stderr.write(self.get_charset_name()
- + ' prober hit error at byte ' + str(i)
- + '\n')
- self._mState = constants.eNotMe
- break
- elif codingState == constants.eItsMe:
- self._mState = constants.eFoundIt
- break
- elif codingState == constants.eStart:
- charLen = self._mCodingSM.get_current_charlen()
- if i == 0:
- self._mLastChar[1] = aBuf[0]
- self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
- else:
- self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1],
- charLen)
- self._mLastChar[0] = aBuf[aLen - 1]
- if self.get_state() == constants.eDetecting:
- if (self._mDistributionAnalyzer.got_enough_data() and
- (self.get_confidence() > constants.SHORTCUT_THRESHOLD)):
- self._mState = constants.eFoundIt
- return self.get_state()
- def get_confidence(self):
- return self._mDistributionAnalyzer.get_confidence()
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