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nsEUCTWProber.cpp

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00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /*  -*- C++ -*-
00003 *  Copyright (C) 1998 <developer@mozilla.org>
00004 *
00005 *
00006 *  Permission is hereby granted, free of charge, to any person obtaining
00007 *  a copy of this software and associated documentation files (the
00008 *  "Software"), to deal in the Software without restriction, including
00009 *  without limitation the rights to use, copy, modify, merge, publish,
00010 *  distribute, sublicense, and/or sell copies of the Software, and to
00011 *  permit persons to whom the Software is furnished to do so, subject to
00012 *  the following conditions:
00013 *
00014 *  The above copyright notice and this permission notice shall be included 
00015 *  in all copies or substantial portions of the Software.
00016 *
00017 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00018 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00019 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00020 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00021 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00022 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00023 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00024 */
00025 
00026 #include "nsEUCTWProber.h"
00027 
00028 namespace kencodingprober {
00029 void  nsEUCTWProber::Reset(void)
00030 {
00031   mCodingSM->Reset(); 
00032   mState = eDetecting;
00033   mDistributionAnalyser.Reset();
00034   //mContextAnalyser.Reset();
00035 }
00036 
00037 nsProbingState nsEUCTWProber::HandleData(const char* aBuf, unsigned int aLen)
00038 {
00039   nsSMState codingState;
00040 
00041   for (unsigned int i = 0; i < aLen; i++)
00042   {
00043     codingState = mCodingSM->NextState(aBuf[i]);
00044     if (codingState == eError)
00045     {
00046       mState = eNotMe;
00047       break;
00048     }
00049     if (codingState == eItsMe)
00050     {
00051       mState = eFoundIt;
00052       break;
00053     }
00054     if (codingState == eStart)
00055     {
00056       unsigned int charLen = mCodingSM->GetCurrentCharLen();
00057 
00058       if (i == 0)
00059       {
00060         mLastChar[1] = aBuf[0];
00061         mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
00062       }
00063       else
00064         mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
00065     }
00066   }
00067 
00068   mLastChar[0] = aBuf[aLen-1];
00069 
00070   if (mState == eDetecting)
00071     if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
00072       mState = eFoundIt;
00073 //    else
00074 //      mDistributionAnalyser.HandleData(aBuf, aLen);
00075 
00076   return mState;
00077 }
00078 
00079 float nsEUCTWProber::GetConfidence(void)
00080 {
00081   float distribCf = mDistributionAnalyser.GetConfidence();
00082 
00083   return (float)distribCf;
00084 }
00085 }
00086 
00087 

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