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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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