104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** 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.org 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) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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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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// for japanese encoding, obeserve characteristic:
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// 1, kana character (or hankaku?) often have hight frequency of appereance
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// 2, kana character often exist in group
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// 3, certain combination of kana is never used in japanese language
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#include "nsEUCJPProber.h"
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void nsEUCJPProber::Reset(void)
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{
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mCodingSM->Reset();
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mState = eDetecting;
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mContextAnalyser.Reset();
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mDistributionAnalyser.Reset();
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}
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nsProbingState nsEUCJPProber::HandleData(const char* aBuf, PRUint32 aLen)
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{
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nsSMState codingState;
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for (PRUint32 i = 0; i < aLen; i++)
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{
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codingState = mCodingSM->NextState(aBuf[i]);
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if (codingState == eError)
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{
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mState = eNotMe;
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break;
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}
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if (codingState == eItsMe)
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{
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mState = eFoundIt;
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break;
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}
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if (codingState == eStart)
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{
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PRUint32 charLen = mCodingSM->GetCurrentCharLen();
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if (i == 0)
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{
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mLastChar[1] = aBuf[0];
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mContextAnalyser.HandleOneChar(mLastChar, charLen);
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mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
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}
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else
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{
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mContextAnalyser.HandleOneChar(aBuf+i-1, charLen);
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mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
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}
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}
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}
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mLastChar[0] = aBuf[aLen-1];
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if (mState == eDetecting)
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if (mContextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
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mState = eFoundIt;
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return mState;
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}
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float nsEUCJPProber::GetConfidence(void)
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{
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float contxtCf = mContextAnalyser.GetConfidence();
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float distribCf = mDistributionAnalyser.GetConfidence();
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return (contxtCf > distribCf ? contxtCf : distribCf);
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}
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