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 /* -*- Mode: C; tab-width: 4; 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 Universal charset detector code.
  *
  * The Initial Developer of the Original Code is
  * Netscape Communications Corporation.
  * Portions created by the Initial Developer are Copyright (C) 2001
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
  *          Shy Shalom <shooshX@gmail.com>
  *
  * 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
  * of those above. If you wish to allow use of your version of this file only
  * under the terms of either the GPL or the LGPL, and not to allow others to
  * use your version of this file under the terms of the MPL, indicate your
  * decision by deleting the provisions above and replace them with the notice
  * and other provisions required by the GPL or the LGPL. If you do not delete
  * the provisions above, a recipient may use your version of this file under
  * the terms of any one of the MPL, the GPL or the LGPL.
  *
  * ***** END LICENSE BLOCK ***** */
 #ifndef nsSingleByteCharSetProber_h__
 #define nsSingleByteCharSetProber_h__
 
 #include "nsCharSetProber.h"
 
 #define SAMPLE_SIZE 64
 #define SB_ENOUGH_REL_THRESHOLD  1024
 #define POSITIVE_SHORTCUT_THRESHOLD  (float)0.95
 #define NEGATIVE_SHORTCUT_THRESHOLD  (float)0.05
 #define SYMBOL_CAT_ORDER  250
 #define NUMBER_OF_SEQ_CAT 4
 #define POSITIVE_CAT   (NUMBER_OF_SEQ_CAT-1)
 #define NEGATIVE_CAT   0
 
 typedef struct
 {
   unsigned char *charToOrderMap;    // [256] table use to find a char's order
   char *precedenceMatrix;           // [SAMPLE_SIZE][SAMPLE_SIZE]; table to find a 2-char sequence's frequency
   float  mTypicalPositiveRatio;     // = freqSeqs / totalSeqs 
   PRBool keepEnglishLetter;         // says if this script contains English characters (not implemented)
   const char* charsetName;
 } SequenceModel;
 
 
 class nsSingleByteCharSetProber : public nsCharSetProber{
 public:
   nsSingleByteCharSetProber(SequenceModel *model) 
     :mModel(model), mReversed(PR_FALSE), mNameProber(0) { Reset(); }
   nsSingleByteCharSetProber(SequenceModel *model, PRBool reversed, nsCharSetProber* nameProber)
     :mModel(model), mReversed(reversed), mNameProber(nameProber) { Reset(); }
 
   virtual const char* GetCharSetName();
   virtual nsProbingState HandleData(const char* aBuf, PRUint32 aLen);
   virtual nsProbingState GetState(void) {return mState;};
   virtual void      Reset(void);
   virtual float     GetConfidence(void);
   virtual void      SetOpion() {}
   
   // This feature is not implemented yet. any current language model
   // contain this parameter as PR_FALSE. No one is looking at this
   // parameter or calling this method.
   // Moreover, the nsSBCSGroupProber which calls the HandleData of this
   // prober has a hard-coded call to FilterWithoutEnglishLetters which gets rid
   // of the English letters.
   PRBool KeepEnglishLetters() {return mModel->keepEnglishLetter;}; // (not implemented)
 
 #ifdef DEBUG_chardet
   virtual void  DumpStatus();
 #endif
 
 protected:
   nsProbingState mState;
   const SequenceModel *mModel;
   const PRBool mReversed; // PR_TRUE if we need to reverse every pair in the model lookup
 
   //char order of last character
   unsigned char mLastOrder;
 
   PRUint32 mTotalSeqs;
   PRUint32 mSeqCounters[NUMBER_OF_SEQ_CAT];
 
   PRUint32 mTotalChar;
   //characters that fall in our sampling range
   PRUint32 mFreqChar;
   
   // Optional auxiliary prober for name decision. created and destroyed by the GroupProber
   nsCharSetProber* mNameProber; 
 
 };
 
 
 extern SequenceModel Koi8rModel;
 extern SequenceModel Win1251Model;
 extern SequenceModel Latin5Model;
 extern SequenceModel MacCyrillicModel;
 extern SequenceModel Ibm866Model;
 extern SequenceModel Ibm855Model;
 extern SequenceModel Latin7Model;
 extern SequenceModel Win1253Model;
 extern SequenceModel Latin5BulgarianModel;
 extern SequenceModel Win1251BulgarianModel;
 extern SequenceModel Latin2HungarianModel;
 extern SequenceModel Win1250HungarianModel;
 extern SequenceModel Win1255Model;
 
 #endif /* nsSingleByteCharSetProber_h__ */