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176 lines
6.2 KiB
176 lines
6.2 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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*
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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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using System;
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namespace UniversalDetector.Core
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{
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/// <summary>
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/// Multi-byte charsets probers
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/// </summary>
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public class MBCSGroupProber : CharsetProber
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{
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private const int PROBERS_NUM = 7;
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private readonly static string[] ProberName =
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{ "UTF8", "SJIS", "EUCJP", "GB18030", "EUCKR", "Big5", "EUCTW" };
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private CharsetProber[] probers = new CharsetProber[PROBERS_NUM];
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private bool[] isActive = new bool[PROBERS_NUM];
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private int bestGuess;
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private int activeNum;
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public MBCSGroupProber()
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{
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probers[0] = new UTF8Prober();
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probers[1] = new SJISProber();
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probers[2] = new EUCJPProber();
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probers[3] = new GB18030Prober();
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probers[4] = new EUCKRProber();
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probers[5] = new Big5Prober();
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probers[6] = new EUCTWProber();
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Reset();
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}
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public override string GetCharsetName()
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{
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if (bestGuess == -1) {
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GetConfidence();
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if (bestGuess == -1)
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bestGuess = 0;
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}
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return probers[bestGuess].GetCharsetName();
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}
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public override void Reset()
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{
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activeNum = 0;
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for (int i = 0; i < probers.Length; i++) {
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if (probers[i] != null) {
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probers[i].Reset();
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isActive[i] = true;
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++activeNum;
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} else {
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isActive[i] = false;
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}
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}
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bestGuess = -1;
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state = ProbingState.Detecting;
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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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// do filtering to reduce load to probers
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byte[] highbyteBuf = new byte[len];
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int hptr = 0;
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//assume previous is not ascii, it will do no harm except add some noise
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bool keepNext = true;
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int max = offset + len;
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for (int i = offset; i < max; i++) {
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if ((buf[i] & 0x80) != 0) {
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highbyteBuf[hptr++] = buf[i];
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keepNext = true;
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} else {
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//if previous is highbyte, keep this even it is a ASCII
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if (keepNext) {
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highbyteBuf[hptr++] = buf[i];
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keepNext = false;
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}
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}
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}
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ProbingState st = ProbingState.NotMe;
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for (int i = 0; i < probers.Length; i++) {
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if (!isActive[i])
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continue;
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st = probers[i].HandleData(highbyteBuf, 0, hptr);
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if (st == ProbingState.FoundIt) {
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bestGuess = i;
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state = ProbingState.FoundIt;
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break;
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} else if (st == ProbingState.NotMe) {
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isActive[i] = false;
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activeNum--;
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if (activeNum <= 0) {
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state = ProbingState.NotMe;
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break;
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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 float GetConfidence()
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{
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float bestConf = 0.0f;
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float cf = 0.0f;
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if (state == ProbingState.FoundIt) {
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return 0.99f;
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} else if (state == ProbingState.NotMe) {
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return 0.01f;
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} else {
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for (int i = 0; i < PROBERS_NUM; i++) {
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if (!isActive[i])
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continue;
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cf = probers[i].GetConfidence();
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if (bestConf < cf) {
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bestConf = cf;
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bestGuess = i;
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}
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}
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}
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return bestConf;
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}
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public override void DumpStatus()
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{
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float cf;
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GetConfidence();
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for (int i = 0; i < PROBERS_NUM; i++) {
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if (!isActive[i]) {
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//Console.WriteLine(" MBCS inactive: {0} (confidence is too low).", ProberName[i]);
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} else {
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cf = probers[i].GetConfidence();
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//Console.WriteLine(" MBCS {0}: [{1}]", cf, ProberName[i]);
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}
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}
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}
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}
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}
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