text: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
  /* ***** BEGIN LICENSE BLOCK *****
   * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   *
   * The contents of this file are subject to the Mozilla Public License Version
   * 1.1 (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   * http://www.mozilla.org/MPL/
   *
   * Software distributed under the License is distributed on an "AS IS" basis,
   * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
   * for the specific language governing rights and limitations under the
   * License.
   *
   * The Original Code is Mozilla Communicator client code.
   *
   * The Initial Developer of the Original Code is
   * Netscape Communications Corporation.
   * Portions created by the Initial Developer are Copyright (C) 1998
   * the Initial Developer. All Rights Reserved.
   *
   * Contributor(s):
   *
   * Alternatively, the contents of this file may be used under the terms of
   * either the GNU General Public License Version 2 or later (the "GPL"), or
   * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
   * in which case the provisions of the GPL or the LGPL are applicable instead
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   * ***** END LICENSE BLOCK ***** */
  
  #pragma GCC visibility push(hidden)
  
  #include "CharDistribution.h"
  
  #include "JISFreq.tab"
  #include "Big5Freq.tab"
  #include "EUCKRFreq.tab"
  #include "EUCTWFreq.tab"
  #include "GB2312Freq.tab"
  
  #define SURE_YES 0.99f
  #define SURE_NO  0.01f
  
  //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;
  }
  
  EUCTWDistributionAnalysis::EUCTWDistributionAnalysis()
  {
    mCharToFreqOrder = EUCTWCharToFreqOrder;
    mTableSize = EUCTW_TABLE_SIZE;
    mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO;
  }
  
  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;
  }
  
  #pragma GCC visibility pop
  