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86 lines
3.1 KiB
86 lines
3.1 KiB
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Shy Shalom <shooshX@gmail.com>
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* Kohei TAKETA <k-tak@void.in> (Java port)
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* Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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namespace UniversalDetector.Core
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{
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/// <summary>
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/// Parallel state machine for the Coding Scheme Method
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/// </summary>
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public class CodingStateMachine
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{
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private int currentState;
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private SMModel model;
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private int currentCharLen;
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private int currentBytePos;
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public CodingStateMachine(SMModel model)
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{
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this.currentState = SMModel.START;
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this.model = model;
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}
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public int NextState(byte b)
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{
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// for each byte we get its class, if it is first byte,
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// we also get byte length
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int byteCls = model.GetClass(b);
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if (currentState == SMModel.START)
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{
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currentBytePos = 0;
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currentCharLen = model.charLenTable[byteCls];
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}
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// from byte's class and stateTable, we get its next state
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currentState = model.stateTable.Unpack(
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currentState * model.ClassFactor + byteCls);
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currentBytePos++;
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return currentState;
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}
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public void Reset()
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{
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currentState = SMModel.START;
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}
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public int CurrentCharLen => currentCharLen;
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public string ModelName => model.Name;
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}
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}
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