File indexing completed on 2024-04-28 03:53:02

 /*  -*- C++ -*-
     SPDX-FileCopyrightText: 1998 Netscape Communications Corporation <developer@mozilla.org>
 
     SPDX-License-Identifier: MIT
 */
 
 #include "CharDistribution.h"
 
 #include "tables/Big5Freq.tab"
 #include "tables/EUCKRFreq.tab"
 #include "tables/GB2312Freq.tab"
 #include "tables/JISFreq.tab"
 
 #define SURE_YES 0.99f
 #define SURE_NO 0.01f
 
 namespace kencodingprober
 {
 // return confidence base on received data
 float CharDistributionAnalysis::GetConfidence()
 {
     // if we didn't receive any character in our consideration range, return negative answer
     if (mTotalChars == 0) {
         return SURE_NO;
     }
 
     if (mTotalChars != mFreqChars) {
         float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio);
 
         if (r < SURE_YES) {
             return r;
         }
     }
     // normalize confidence, (we don't want to be 100% sure)
     return SURE_YES;
 }
 
 EUCKRDistributionAnalysis::EUCKRDistributionAnalysis()
 {
     mCharToFreqOrder = EUCKRCharToFreqOrder;
     mTableSize = EUCKR_TABLE_SIZE;
     mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO;
 }
 
 GB2312DistributionAnalysis::GB2312DistributionAnalysis()
 {
     mCharToFreqOrder = GB2312CharToFreqOrder;
     mTableSize = GB2312_TABLE_SIZE;
     mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO;
 }
 
 Big5DistributionAnalysis::Big5DistributionAnalysis()
 {
     mCharToFreqOrder = Big5CharToFreqOrder;
     mTableSize = BIG5_TABLE_SIZE;
     mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO;
 }
 
 SJISDistributionAnalysis::SJISDistributionAnalysis()
 {
     mCharToFreqOrder = JISCharToFreqOrder;
     mTableSize = JIS_TABLE_SIZE;
     mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
 }
 
 EUCJPDistributionAnalysis::EUCJPDistributionAnalysis()
 {
     mCharToFreqOrder = JISCharToFreqOrder;
     mTableSize = JIS_TABLE_SIZE;
     mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
 }
 }