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nsBig5Prober.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 "nsBig5Prober.h"
00027 
00028 namespace kencodingprober {
00029 void  nsBig5Prober::Reset(void)
00030 {
00031   mCodingSM->Reset(); 
00032   mState = eDetecting;
00033   mDistributionAnalyser.Reset();
00034 }
00035 
00036 nsProbingState nsBig5Prober::HandleData(const char* aBuf, unsigned int aLen)
00037 {
00038   nsSMState codingState;
00039 
00040   for (unsigned int i = 0; i < aLen; i++)
00041   {
00042     codingState = mCodingSM->NextState(aBuf[i]);
00043     if (codingState == eError)
00044     {
00045       mState = eNotMe;
00046       break;
00047     }
00048     if (codingState == eItsMe)
00049     {
00050       mState = eFoundIt;
00051       break;
00052     }
00053     if (codingState == eStart)
00054     {
00055       unsigned int charLen = mCodingSM->GetCurrentCharLen();
00056 
00057       if (i == 0)
00058       {
00059         mLastChar[1] = aBuf[0];
00060         mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
00061       }
00062       else
00063         mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
00064     }
00065   }
00066 
00067   mLastChar[0] = aBuf[aLen-1];
00068 
00069   if (mState == eDetecting)
00070     if (mDistributionAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
00071       mState = eFoundIt;
00072 
00073   return mState;
00074 }
00075 
00076 float nsBig5Prober::GetConfidence(void)
00077 {
00078   float distribCf = mDistributionAnalyser.GetConfidence();
00079 
00080   return (float)distribCf;
00081 }
00082 }
00083 
00084 

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