LCOV - code coverage report
Current view: directory - extensions/universalchardet/src/base - nsSJISProber.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 30 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : // for S-JIS encoding, obeserve characteristic:
      39                 : // 1, kana character (or hankaku?) often have hight frequency of appereance
      40                 : // 2, kana character often exist in group
      41                 : // 3, certain combination of kana is never used in japanese language
      42                 : 
      43                 : #include "nsSJISProber.h"
      44                 : #include "nsDebug.h"
      45                 : 
      46               0 : void  nsSJISProber::Reset(void)
      47                 : {
      48               0 :   mCodingSM->Reset(); 
      49               0 :   mState = eDetecting;
      50               0 :   mContextAnalyser.Reset(mIsPreferredLanguage);
      51               0 :   mDistributionAnalyser.Reset(mIsPreferredLanguage);
      52               0 : }
      53                 : 
      54               0 : nsProbingState nsSJISProber::HandleData(const char* aBuf, PRUint32 aLen)
      55                 : {
      56               0 :   NS_ASSERTION(aLen, "HandleData called with empty buffer");
      57                 :   nsSMState codingState;
      58                 : 
      59               0 :   for (PRUint32 i = 0; i < aLen; i++)
      60                 :   {
      61               0 :     codingState = mCodingSM->NextState(aBuf[i]);
      62               0 :     if (codingState == eItsMe)
      63                 :     {
      64               0 :       mState = eFoundIt;
      65               0 :       break;
      66                 :     }
      67               0 :     if (codingState == eStart)
      68                 :     {
      69               0 :       PRUint32 charLen = mCodingSM->GetCurrentCharLen();
      70               0 :       if (i == 0)
      71                 :       {
      72               0 :         mLastChar[1] = aBuf[0];
      73               0 :         mContextAnalyser.HandleOneChar(mLastChar+2-charLen, charLen);
      74               0 :         mDistributionAnalyser.HandleOneChar(mLastChar, charLen);
      75                 :       }
      76                 :       else
      77                 :       {
      78               0 :         mContextAnalyser.HandleOneChar(aBuf+i+1-charLen, charLen);
      79               0 :         mDistributionAnalyser.HandleOneChar(aBuf+i-1, charLen);
      80                 :       }
      81                 :     }
      82                 :   }
      83                 : 
      84               0 :   mLastChar[0] = aBuf[aLen-1];
      85                 : 
      86               0 :   if (mState == eDetecting)
      87               0 :     if (mContextAnalyser.GotEnoughData() && GetConfidence() > SHORTCUT_THRESHOLD)
      88               0 :       mState = eFoundIt;
      89                 : 
      90               0 :   return mState;
      91                 : }
      92                 : 
      93               0 : float nsSJISProber::GetConfidence(void)
      94                 : {
      95               0 :   float contxtCf = mContextAnalyser.GetConfidence();
      96               0 :   float distribCf = mDistributionAnalyser.GetConfidence();
      97                 : 
      98               0 :   return (contxtCf > distribCf ? contxtCf : distribCf);
      99                 : }
     100                 : 

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