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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
{
const unsigned char* const charToOrderMap; // [256] table use to find a char's order
const PRUint8* const 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* const charsetName;
const char* const langName;
} SequenceModel;
class nsSingleByteCharSetProber : public nsCharSetProber{
public:
nsSingleByteCharSetProber(const SequenceModel *model)
:mModel(model), mReversed(PR_FALSE), mNameProber(0) { Reset(); }
nsSingleByteCharSetProber(const SequenceModel *model, PRBool reversed, nsCharSetProber* nameProber)
:mModel(model), mReversed(reversed), mNameProber(nameProber) { Reset(); }
virtual const char* GetCharSetName();
virtual const char* GetLangName() {return mModel?mModel->langName:"";}
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() {}
virtual PRBool KeepEnglishLetters() {return mModel->keepEnglishLetter;}
#ifdef DEBUG_chardet
virtual void DumpStatus();
#endif
protected:
nsProbingState mState;
const SequenceModel* const 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 const SequenceModel Koi8rModel;
extern const SequenceModel Win1251Model;
extern const SequenceModel Latin5Model;
extern const SequenceModel MacCyrillicModel;
extern const SequenceModel Ibm866Model;
extern const SequenceModel Ibm855Model;
extern const SequenceModel ISO_8859_7greekModel;
extern const SequenceModel WINDOWS_1253greekModel;
extern const SequenceModel Latin5BulgarianModel;
extern const SequenceModel Win1251BulgarianModel;
extern const SequenceModel Latin2HungarianModel;
extern const SequenceModel Win1250HungarianModel;
extern const SequenceModel Win1255Model;
extern const SequenceModel TIS620ThaiModel;
extern const SequenceModel WINDOWS_1252frenchModel;
extern const SequenceModel WINDOWS_1252germanModel;
extern const SequenceModel WINDOWS_1252swedishModel;
extern const SequenceModel ISO_8859_9turkishModel;
extern const SequenceModel WINDOWS_1252finnishModel;
extern const SequenceModel windows_1252spanishModel;
extern const SequenceModel iso_8859_2czechModel;
extern const SequenceModel iso_8859_2polishModel;
#endif /* nsSingleByteCharSetProber_h__ */
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