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######################## BEGIN LICENSE BLOCK ######################## # The Original Code is mozilla.org code. # # The Initial Developer of the Original Code is # Netscape Communications Corporation. # Portions created by the Initial Developer are Copyright (C) 1998 # the Initial Developer. All Rights Reserved. # # Contributor(s): # Mark Pilgrim - port to Python # # 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 .constants import eStart from .compat import wrap_ord class CodingStateMachine: def __init__(self, sm): self._mModel = sm self._mCurrentBytePos = 0 self._mCurrentCharLen = 0 self.reset() def reset(self): self._mCurrentState = eStart def next_state(self, c): # for each byte we get its class # if it is first byte, we also get byte length # PY3K: aBuf is a byte stream, so c is an int, not a byte byteCls = self._mModel['classTable'][wrap_ord(c)] if self._mCurrentState == eStart: self._mCurrentBytePos = 0 self._mCurrentCharLen = self._mModel['charLenTable'][byteCls] # from byte's class and stateTable, we get its next state curr_state = (self._mCurrentState * self._mModel['classFactor'] + byteCls) self._mCurrentState = self._mModel['stateTable'][curr_state] self._mCurrentBytePos += 1 return self._mCurrentState def get_current_charlen(self): return self._mCurrentCharLen def get_coding_state_machine(self): return self._mModel['name']