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| 1 ######################## BEGIN LICENSE BLOCK ######################## | |
| 2 # The Original Code is mozilla.org 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) 1998 | |
| 7 # the Initial Developer. All Rights Reserved. | |
| 8 # | |
| 9 # Contributor(s): | |
| 10 # Mark Pilgrim - port to Python | |
| 11 # | |
| 12 # This library is free software; you can redistribute it and/or | |
| 13 # modify it under the terms of the GNU Lesser General Public | |
| 14 # License as published by the Free Software Foundation; either | |
| 15 # version 2.1 of the License, or (at your option) any later version. | |
| 16 # | |
| 17 # This library is distributed in the hope that it will be useful, | |
| 18 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 20 # Lesser General Public License for more details. | |
| 21 # | |
| 22 # You should have received a copy of the GNU Lesser General Public | |
| 23 # License along with this library; if not, write to the Free Software | |
| 24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
| 25 # 02110-1301 USA | |
| 26 ######################### END LICENSE BLOCK ######################### | |
| 27 | |
| 28 from .constants import eStart | |
| 29 from .compat import wrap_ord | |
| 30 | |
| 31 | |
| 32 class CodingStateMachine: | |
| 33 def __init__(self, sm): | |
| 34 self._mModel = sm | |
| 35 self._mCurrentBytePos = 0 | |
| 36 self._mCurrentCharLen = 0 | |
| 37 self.reset() | |
| 38 | |
| 39 def reset(self): | |
| 40 self._mCurrentState = eStart | |
| 41 | |
| 42 def next_state(self, c): | |
| 43 # for each byte we get its class | |
| 44 # if it is first byte, we also get byte length | |
| 45 # PY3K: aBuf is a byte stream, so c is an int, not a byte | |
| 46 byteCls = self._mModel['classTable'][wrap_ord(c)] | |
| 47 if self._mCurrentState == eStart: | |
| 48 self._mCurrentBytePos = 0 | |
| 49 self._mCurrentCharLen = self._mModel['charLenTable'][byteCls] | |
| 50 # from byte's class and stateTable, we get its next state | |
| 51 curr_state = (self._mCurrentState * self._mModel['classFactor'] | |
| 52 + byteCls) | |
| 53 self._mCurrentState = self._mModel['stateTable'][curr_state] | |
| 54 self._mCurrentBytePos += 1 | |
| 55 return self._mCurrentState | |
| 56 | |
| 57 def get_current_charlen(self): | |
| 58 return self._mCurrentCharLen | |
| 59 | |
| 60 def get_coding_state_machine(self): | |
| 61 return self._mModel['name'] | |
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