| ######################## 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'] |
