eucjpprober.js
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/*
* 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):
* António Afonso (antonio.afonso gmail.com) - port to JavaScript
* Mark Pilgrim - port to Python
* Shy Shalom - original C code
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
!function(jschardet) {
jschardet.EUCJPProber = function() {
jschardet.MultiByteCharSetProber.apply(this);
var self = this;
function init() {
self._mCodingSM = new jschardet.CodingStateMachine(jschardet.EUCJPSMModel);
self._mDistributionAnalyzer = new jschardet.EUCJPDistributionAnalysis();
self._mContextAnalyzer = new jschardet.EUCJPContextAnalysis();
self.reset();
}
this.reset = function() {
jschardet.EUCJPProber.prototype.reset.apply(this);
this._mContextAnalyzer.reset();
}
this.getCharsetName = function() {
return "EUC-JP";
}
this.feed = function(aBuf) {
var aLen = aBuf.length;
for( var i = 0; i < aLen; i++ ) {
var codingState = this._mCodingSM.nextState(aBuf[i]);
if( codingState == jschardet.Constants.error ) {
if( jschardet.Constants._debug ) {
jschardet.log(this.getCharsetName() + " prober hit error at byte " + i + "\n");
}
this._mState = jschardet.Constants.notMe;
break;
} else if( codingState == jschardet.Constants.itsMe ) {
this._mState = jschardet.Constants.foundIt;
break;
} else if( codingState == jschardet.Constants.start ) {
var charLen = this._mCodingSM.getCurrentCharLen();
if( i == 0 ) {
this._mLastChar[1] = aBuf[0];
this._mContextAnalyzer.feed(this._mLastChar, charLen);
this._mDistributionAnalyzer.feed(this._mLastChar, charLen);
} else {
this._mContextAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
this._mDistributionAnalyzer.feed(aBuf.slice(i-1,i+1), charLen);
}
}
}
this._mLastChar[0] = aBuf[aLen - 1];
if( this.getState() == jschardet.Constants.detecting ) {
if( this._mContextAnalyzer.gotEnoughData() &&
this.getConfidence() > jschardet.Constants.SHORTCUT_THRESHOLD ) {
this._mState = jschardet.Constants.foundIt;
}
}
return this.getState();
}
this.getConfidence = function() {
var contxtCf = this._mContextAnalyzer.getConfidence();
var distribCf = this._mDistributionAnalyzer.getConfidence();
return Math.max(contxtCf, distribCf);
}
init();
}
jschardet.EUCJPProber.prototype = new jschardet.MultiByteCharSetProber();
}(require('./init'));