mirror of
https://github.com/fofolee/uTools-ProcessKiller.git
synced 2025-06-14 10:07:00 +08:00
99 lines
3.0 KiB
JavaScript
99 lines
3.0 KiB
JavaScript
/*
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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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* António Afonso (antonio.afonso gmail.com) - port to JavaScript
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* Mark Pilgrim - port to Python
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* Shy Shalom - original C code
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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var CodingStateMachine = require('./codingstatemachine');
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var CharSetProber = require('./charsetprober');
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var constants = require('./constants');
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var UTF8SMModel = require('./mbcssm/utf8');
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function UTF8Prober() {
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CharSetProber.apply(this);
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var ONE_CHAR_PROB = 0.5;
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var self = this;
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function init() {
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self._mCodingSM = new CodingStateMachine(UTF8SMModel);
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self.reset();
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}
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this.reset = function() {
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UTF8Prober.prototype.reset.apply(this);
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this._mCodingSM.reset();
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this._mNumOfMBChar = 0;
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}
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this.getCharsetName = function() {
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return "UTF-8";
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}
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this.feed = function(aBuf) {
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for( var i = 0, c; i < aBuf.length; i++ ) {
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c = aBuf[i];
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var codingState = this._mCodingSM.nextState(c);
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if( codingState == constants.error ) {
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this._mState = constants.notMe;
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break;
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} else if( codingState == constants.itsMe ) {
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this._mState = constants.foundIt;
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break;
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} else if( codingState == constants.start ) {
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if( this._mCodingSM.getCurrentCharLen() >= 2 ) {
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this._mNumOfMBChar++;
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}
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}
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}
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if( this.getState() == constants.detecting ) {
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if( this.getConfidence() > constants.SHORTCUT_THRESHOLD ) {
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this._mState = constants.foundIt;
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}
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}
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return this.getState();
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}
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this.getConfidence = function() {
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var unlike = 0.99;
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if( this._mNumOfMBChar < 6 ) {
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for( var i = 0; i < this._mNumOfMBChar; i++ ) {
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unlike *= ONE_CHAR_PROB;
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}
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return 1 - unlike;
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} else {
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return unlike;
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}
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}
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init();
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}
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UTF8Prober.prototype = new CharSetProber();
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module.exports = UTF8Prober;
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