106 lines
4.2 KiB
C#
106 lines
4.2 KiB
C#
|
/* ***** BEGIN LICENSE BLOCK *****
|
||
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
||
|
|
*
|
||
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
||
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
||
|
|
* the License. You may obtain a copy of the License at
|
||
|
|
* http://www.mozilla.org/MPL/
|
||
|
|
*
|
||
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
||
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
||
|
|
* for the specific language governing rights and limitations under the
|
||
|
|
* License.
|
||
|
|
*
|
||
|
|
* The Original Code is Mozilla Universal charset detector code.
|
||
|
|
*
|
||
|
|
* The Initial Developer of the Original Code is
|
||
|
|
* Netscape Communications Corporation.
|
||
|
|
* Portions created by the Initial Developer are Copyright (C) 2001
|
||
|
|
* the Initial Developer. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Contributor(s):
|
||
|
|
* Shy Shalom <shooshX@gmail.com>
|
||
|
|
* Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port)
|
||
|
|
* Alternatively, the contents of this file may be used under the terms of
|
||
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
||
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
||
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
||
|
|
* of those above. If you wish to allow use of your version of this file only
|
||
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
||
|
|
* use your version of this file under the terms of the MPL, indicate your
|
||
|
|
* decision by deleting the provisions above and replace them with the notice
|
||
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
||
|
|
* the provisions above, a recipient may use your version of this file under
|
||
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
||
|
|
*
|
||
|
|
* ***** END LICENSE BLOCK ***** */
|
||
|
|
|
||
|
|
namespace UniversalDetector.Core
|
||
|
|
{
|
||
|
|
public class EscCharsetProber : CharsetProber
|
||
|
|
{
|
||
|
|
private const int CHARSETS_NUM = 4;
|
||
|
|
private string detectedCharset;
|
||
|
|
private CodingStateMachine[] codingSM;
|
||
|
|
int activeSM;
|
||
|
|
|
||
|
|
public EscCharsetProber()
|
||
|
|
{
|
||
|
|
codingSM = new CodingStateMachine[CHARSETS_NUM];
|
||
|
|
codingSM[0] = new CodingStateMachine(new HZSMModel());
|
||
|
|
codingSM[1] = new CodingStateMachine(new ISO2022CNSMModel());
|
||
|
|
codingSM[2] = new CodingStateMachine(new ISO2022JPSMModel());
|
||
|
|
codingSM[3] = new CodingStateMachine(new ISO2022KRSMModel());
|
||
|
|
Reset();
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Reset()
|
||
|
|
{
|
||
|
|
state = ProbingState.Detecting;
|
||
|
|
for (int i = 0; i < CHARSETS_NUM; i++)
|
||
|
|
codingSM[i].Reset();
|
||
|
|
activeSM = CHARSETS_NUM;
|
||
|
|
detectedCharset = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override ProbingState HandleData(byte[] buf, int offset, int len)
|
||
|
|
{
|
||
|
|
int max = offset + len;
|
||
|
|
|
||
|
|
for (int i = offset; i < max && state == ProbingState.Detecting; i++) {
|
||
|
|
for (int j = activeSM - 1; j >= 0; j--) {
|
||
|
|
// byte is feed to all active state machine
|
||
|
|
int codingState = codingSM[j].NextState(buf[i]);
|
||
|
|
if (codingState == SMModel.ERROR) {
|
||
|
|
// got negative answer for this state machine, make it inactive
|
||
|
|
activeSM--;
|
||
|
|
if (activeSM == 0) {
|
||
|
|
state = ProbingState.NotMe;
|
||
|
|
return state;
|
||
|
|
} else if (j != activeSM) {
|
||
|
|
CodingStateMachine t = codingSM[activeSM];
|
||
|
|
codingSM[activeSM] = codingSM[j];
|
||
|
|
codingSM[j] = t;
|
||
|
|
}
|
||
|
|
} else if (codingState == SMModel.ITSME) {
|
||
|
|
state = ProbingState.FoundIt;
|
||
|
|
detectedCharset = codingSM[j].ModelName;
|
||
|
|
return state;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return state;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override string GetCharsetName()
|
||
|
|
{
|
||
|
|
return detectedCharset;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override float GetConfidence()
|
||
|
|
{
|
||
|
|
return 0.99f;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|