LCOV - code coverage report
Current view: directory - extensions/universalchardet/src/base - CharDistribution.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 38 0 0.0 %
Date: 2012-06-02 Functions: 7 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; 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 Communicator client 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                 : #include "CharDistribution.h"
      39                 : 
      40                 : #include "JISFreq.tab"
      41                 : #include "Big5Freq.tab"
      42                 : #include "EUCKRFreq.tab"
      43                 : #include "EUCTWFreq.tab"
      44                 : #include "GB2312Freq.tab"
      45                 : 
      46                 : #define SURE_YES 0.99f
      47                 : #define SURE_NO  0.01f
      48                 : 
      49                 : //return confidence base on received data
      50               0 : float CharDistributionAnalysis::GetConfidence(void)
      51                 : { 
      52                 :   //if we didn't receive any character in our consideration range, or the
      53                 :   // number of frequent characters is below the minimum threshold, return
      54                 :   // negative answer
      55               0 :   if (mTotalChars <= 0 || mFreqChars <= mDataThreshold)
      56               0 :     return SURE_NO;
      57                 : 
      58               0 :   if (mTotalChars != mFreqChars) {
      59               0 :     float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio);
      60                 : 
      61               0 :     if (r < SURE_YES)
      62               0 :       return r;
      63                 :   }
      64                 :   //normalize confidence, (we don't want to be 100% sure)
      65               0 :   return SURE_YES;
      66                 : }
      67                 : 
      68               0 : EUCTWDistributionAnalysis::EUCTWDistributionAnalysis()
      69                 : {
      70               0 :   mCharToFreqOrder = EUCTWCharToFreqOrder;
      71               0 :   mTableSize = EUCTW_TABLE_SIZE;
      72               0 :   mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO;
      73               0 : }
      74                 : 
      75               0 : EUCKRDistributionAnalysis::EUCKRDistributionAnalysis()
      76                 : {
      77               0 :   mCharToFreqOrder = EUCKRCharToFreqOrder;
      78               0 :   mTableSize = EUCKR_TABLE_SIZE;
      79               0 :   mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO;
      80               0 : }
      81                 : 
      82               0 : GB2312DistributionAnalysis::GB2312DistributionAnalysis()
      83                 : {
      84               0 :   mCharToFreqOrder = GB2312CharToFreqOrder;
      85               0 :   mTableSize = GB2312_TABLE_SIZE;
      86               0 :   mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO;
      87               0 : }
      88                 : 
      89               0 : Big5DistributionAnalysis::Big5DistributionAnalysis()
      90                 : {
      91               0 :   mCharToFreqOrder = Big5CharToFreqOrder;
      92               0 :   mTableSize = BIG5_TABLE_SIZE;
      93               0 :   mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO;
      94               0 : }
      95                 : 
      96               0 : SJISDistributionAnalysis::SJISDistributionAnalysis()
      97                 : {
      98               0 :   mCharToFreqOrder = JISCharToFreqOrder;
      99               0 :   mTableSize = JIS_TABLE_SIZE;
     100               0 :   mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
     101               0 : }
     102                 : 
     103               0 : EUCJPDistributionAnalysis::EUCJPDistributionAnalysis()
     104                 : {
     105               0 :   mCharToFreqOrder = JISCharToFreqOrder;
     106               0 :   mTableSize = JIS_TABLE_SIZE;
     107               0 :   mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
     108               0 : }
     109                 : 

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