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114 lines
4.3 KiB
114 lines
4.3 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 Universal charset detector 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) 2001
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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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* Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port)
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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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public class EscCharsetProber : CharsetProber
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{
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private const int CHARSETS_NUM = 4;
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private string detectedCharset;
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private CodingStateMachine[] codingSM;
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int activeSM;
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public EscCharsetProber()
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{
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codingSM = new CodingStateMachine[CHARSETS_NUM];
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codingSM[0] = new CodingStateMachine(new HZSMModel());
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codingSM[1] = new CodingStateMachine(new ISO2022CNSMModel());
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codingSM[2] = new CodingStateMachine(new ISO2022JPSMModel());
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codingSM[3] = new CodingStateMachine(new ISO2022KRSMModel());
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Reset();
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}
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public override void Reset()
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{
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state = ProbingState.Detecting;
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for (int i = 0; i < CHARSETS_NUM; i++)
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codingSM[i].Reset();
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activeSM = CHARSETS_NUM;
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detectedCharset = null;
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}
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public override ProbingState HandleData(byte[] buf, int offset, int len)
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{
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int max = offset + len;
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for (int i = offset; i < max && state == ProbingState.Detecting; i++)
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{
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for (int j = activeSM - 1; j >= 0; j--)
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{
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// byte is feed to all active state machine
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int codingState = codingSM[j].NextState(buf[i]);
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if (codingState == SMModel.ERROR)
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{
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// got negative answer for this state machine, make it inactive
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activeSM--;
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if (activeSM == 0)
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{
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state = ProbingState.NotMe;
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return state;
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}
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else if (j != activeSM)
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{
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CodingStateMachine t = codingSM[activeSM];
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codingSM[activeSM] = codingSM[j];
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codingSM[j] = t;
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}
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}
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else if (codingState == SMModel.ITSME)
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{
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state = ProbingState.FoundIt;
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detectedCharset = codingSM[j].ModelName;
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return state;
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}
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}
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}
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return state;
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}
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public override string GetCharsetName()
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{
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return detectedCharset;
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}
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public override float GetConfidence()
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{
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return 0.99f;
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}
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}
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}
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