LCOV - code coverage report
Current view: directory - extensions/universalchardet/src/base - nsSBCharSetProber.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 42 0 0.0 %
Date: 2012-06-02 Functions: 4 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 Universal charset detector 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) 2001
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *          Shy Shalom <shooshX@gmail.com>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : #include <stdio.h>
      39                 : #include "nsSBCharSetProber.h"
      40                 : 
      41               0 : nsProbingState nsSingleByteCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
      42                 : {
      43                 :   unsigned char order;
      44                 : 
      45               0 :   for (PRUint32 i = 0; i < aLen; i++)
      46                 :   {
      47               0 :     order = mModel->charToOrderMap[(unsigned char)aBuf[i]];
      48                 : 
      49               0 :     if (order < SYMBOL_CAT_ORDER)
      50               0 :       mTotalChar++;
      51               0 :     if (order < SAMPLE_SIZE)
      52                 :     {
      53               0 :         mFreqChar++;
      54                 : 
      55               0 :       if (mLastOrder < SAMPLE_SIZE)
      56                 :       {
      57               0 :         mTotalSeqs++;
      58               0 :         if (!mReversed)
      59               0 :           ++(mSeqCounters[mModel->precedenceMatrix[mLastOrder*SAMPLE_SIZE+order]]);
      60                 :         else // reverse the order of the letters in the lookup
      61               0 :           ++(mSeqCounters[mModel->precedenceMatrix[order*SAMPLE_SIZE+mLastOrder]]);
      62                 :       }
      63                 :     }
      64               0 :     mLastOrder = order;
      65                 :   }
      66                 : 
      67               0 :   if (mState == eDetecting)
      68               0 :     if (mTotalSeqs > SB_ENOUGH_REL_THRESHOLD)
      69                 :     {
      70               0 :       float cf = GetConfidence();
      71               0 :       if (cf > POSITIVE_SHORTCUT_THRESHOLD)
      72               0 :         mState = eFoundIt;
      73               0 :       else if (cf < NEGATIVE_SHORTCUT_THRESHOLD)
      74               0 :         mState = eNotMe;
      75                 :     }
      76                 : 
      77               0 :   return mState;
      78                 : }
      79                 : 
      80               0 : void  nsSingleByteCharSetProber::Reset(void)
      81                 : {
      82               0 :   mState = eDetecting;
      83               0 :   mLastOrder = 255;
      84               0 :   for (PRUint32 i = 0; i < NUMBER_OF_SEQ_CAT; i++)
      85               0 :     mSeqCounters[i] = 0;
      86               0 :   mTotalSeqs = 0;
      87               0 :   mTotalChar = 0;
      88               0 :   mFreqChar = 0;
      89               0 : }
      90                 : 
      91                 : //#define NEGATIVE_APPROACH 1
      92                 : 
      93               0 : float nsSingleByteCharSetProber::GetConfidence(void)
      94                 : {
      95                 : #ifdef NEGATIVE_APPROACH
      96                 :   if (mTotalSeqs > 0)
      97                 :     if (mTotalSeqs > mSeqCounters[NEGATIVE_CAT]*10 )
      98                 :       return ((float)(mTotalSeqs - mSeqCounters[NEGATIVE_CAT]*10))/mTotalSeqs * mFreqChar / mTotalChar;
      99                 :   return (float)0.01;
     100                 : #else  //POSITIVE_APPROACH
     101                 :   float r;
     102                 : 
     103               0 :   if (mTotalSeqs > 0) {
     104               0 :     r = ((float)1.0) * mSeqCounters[POSITIVE_CAT] / mTotalSeqs / mModel->mTypicalPositiveRatio;
     105               0 :     r = r*mFreqChar/mTotalChar;
     106               0 :     if (r >= (float)1.00)
     107               0 :       r = (float)0.99;
     108               0 :     return r;
     109                 :   }
     110               0 :   return (float)0.01;
     111                 : #endif
     112                 : }
     113                 : 
     114               0 : const char* nsSingleByteCharSetProber::GetCharSetName() 
     115                 : {
     116               0 :   if (!mNameProber)
     117               0 :     return mModel->charsetName;
     118               0 :   return mNameProber->GetCharSetName();
     119                 : }
     120                 : 
     121                 : #ifdef DEBUG_chardet
     122                 : void nsSingleByteCharSetProber::DumpStatus()
     123                 : {
     124                 :   printf("  SBCS: %1.3f [%s]\r\n", GetConfidence(), GetCharSetName());
     125                 : }
     126                 : #endif

Generated by: LCOV version 1.7