forked from mia/Aegisub
125 lines
4.9 KiB
C++
125 lines
4.9 KiB
C++
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Universal charset detector code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Shy Shalom <shooshX@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsSingleByteCharSetProber_h__
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#define nsSingleByteCharSetProber_h__
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#include "nsCharSetProber.h"
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#define SAMPLE_SIZE 64
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#define SB_ENOUGH_REL_THRESHOLD 1024
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#define POSITIVE_SHORTCUT_THRESHOLD (float)0.95
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#define NEGATIVE_SHORTCUT_THRESHOLD (float)0.05
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#define SYMBOL_CAT_ORDER 250
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#define NUMBER_OF_SEQ_CAT 4
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#define POSITIVE_CAT (NUMBER_OF_SEQ_CAT-1)
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#define NEGATIVE_CAT 0
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typedef struct
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{
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const unsigned char* const charToOrderMap; // [256] table use to find a char's order
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const char* const precedenceMatrix; // [SAMPLE_SIZE][SAMPLE_SIZE]; table to find a 2-char sequence's frequency
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float mTypicalPositiveRatio; // = freqSeqs / totalSeqs
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PRBool keepEnglishLetter; // says if this script contains English characters (not implemented)
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const char* const charsetName;
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} SequenceModel;
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class nsSingleByteCharSetProber : public nsCharSetProber{
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public:
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nsSingleByteCharSetProber(const SequenceModel *model)
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:mModel(model), mReversed(PR_FALSE), mNameProber(0) { Reset(); }
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nsSingleByteCharSetProber(const SequenceModel *model, PRBool reversed, nsCharSetProber* nameProber)
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:mModel(model), mReversed(reversed), mNameProber(nameProber) { Reset(); }
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virtual const char* GetCharSetName();
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virtual nsProbingState HandleData(const char* aBuf, PRUint32 aLen);
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virtual nsProbingState GetState(void) {return mState;}
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virtual void Reset(void);
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virtual float GetConfidence(void);
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virtual void SetOpion() {}
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// This feature is not implemented yet. any current language model
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// contain this parameter as PR_FALSE. No one is looking at this
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// parameter or calling this method.
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// Moreover, the nsSBCSGroupProber which calls the HandleData of this
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// prober has a hard-coded call to FilterWithoutEnglishLetters which gets rid
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// of the English letters.
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PRBool KeepEnglishLetters() {return mModel->keepEnglishLetter;} // (not implemented)
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#ifdef DEBUG_chardet
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virtual void DumpStatus();
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#endif
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protected:
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nsProbingState mState;
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const SequenceModel* const mModel;
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const PRBool mReversed; // PR_TRUE if we need to reverse every pair in the model lookup
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//char order of last character
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unsigned char mLastOrder;
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PRUint32 mTotalSeqs;
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PRUint32 mSeqCounters[NUMBER_OF_SEQ_CAT];
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PRUint32 mTotalChar;
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//characters that fall in our sampling range
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PRUint32 mFreqChar;
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// Optional auxiliary prober for name decision. created and destroyed by the GroupProber
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nsCharSetProber* mNameProber;
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};
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extern const SequenceModel Koi8rModel;
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extern const SequenceModel Win1251Model;
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extern const SequenceModel Latin5Model;
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extern const SequenceModel MacCyrillicModel;
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extern const SequenceModel Ibm866Model;
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extern const SequenceModel Ibm855Model;
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extern const SequenceModel Latin7Model;
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extern const SequenceModel Win1253Model;
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extern const SequenceModel Latin5BulgarianModel;
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extern const SequenceModel Win1251BulgarianModel;
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extern const SequenceModel Latin2HungarianModel;
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extern const SequenceModel Win1250HungarianModel;
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extern const SequenceModel Win1255Model;
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extern const SequenceModel TIS620ThaiModel;
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#endif /* nsSingleByteCharSetProber_h__ */
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