1 : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is Mozilla Universal charset detector code.
16 : *
17 : * The Initial Developer of the Original Code is
18 : * Netscape Communications Corporation.
19 : * Portions created by the Initial Developer are Copyright (C) 2001
20 : * the Initial Developer. All Rights Reserved.
21 : *
22 : * Contributor(s):
23 : * Shy Shalom <shooshX@gmail.com>
24 : *
25 : * Alternatively, the contents of this file may be used under the terms of
26 : * either the GNU General Public License Version 2 or later (the "GPL"), or
27 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
28 : * in which case the provisions of the GPL or the LGPL are applicable instead
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32 : * decision by deleting the provisions above and replace them with the notice
33 : * and other provisions required by the GPL or the LGPL. If you do not delete
34 : * the provisions above, a recipient may use your version of this file under
35 : * the terms of any one of the MPL, the GPL or the LGPL.
36 : *
37 : * ***** END LICENSE BLOCK ***** */
38 : #ifndef nsSingleByteCharSetProber_h__
39 : #define nsSingleByteCharSetProber_h__
40 :
41 : #include "nsCharSetProber.h"
42 :
43 : #define SAMPLE_SIZE 64
44 : #define SB_ENOUGH_REL_THRESHOLD 1024
45 : #define POSITIVE_SHORTCUT_THRESHOLD (float)0.95
46 : #define NEGATIVE_SHORTCUT_THRESHOLD (float)0.05
47 : #define SYMBOL_CAT_ORDER 250
48 : #define NUMBER_OF_SEQ_CAT 4
49 : #define POSITIVE_CAT (NUMBER_OF_SEQ_CAT-1)
50 : #define NEGATIVE_CAT 0
51 :
52 : typedef struct
53 : {
54 : const unsigned char* const charToOrderMap; // [256] table use to find a char's order
55 : const PRUint8* const precedenceMatrix; // [SAMPLE_SIZE][SAMPLE_SIZE]; table to find a 2-char sequence's frequency
56 : float mTypicalPositiveRatio; // = freqSeqs / totalSeqs
57 : bool keepEnglishLetter; // says if this script contains English characters (not implemented)
58 : const char* const charsetName;
59 : } SequenceModel;
60 :
61 :
62 0 : class nsSingleByteCharSetProber : public nsCharSetProber{
63 : public:
64 0 : nsSingleByteCharSetProber(const SequenceModel *model)
65 0 : :mModel(model), mReversed(false), mNameProber(0) { Reset(); }
66 0 : nsSingleByteCharSetProber(const SequenceModel *model, bool reversed, nsCharSetProber* nameProber)
67 0 : :mModel(model), mReversed(reversed), mNameProber(nameProber) { Reset(); }
68 :
69 : virtual const char* GetCharSetName();
70 : virtual nsProbingState HandleData(const char* aBuf, PRUint32 aLen);
71 0 : virtual nsProbingState GetState(void) {return mState;}
72 : virtual void Reset(void);
73 : virtual float GetConfidence(void);
74 0 : virtual void SetOpion() {}
75 :
76 : // This feature is not implemented yet. any current language model
77 : // contain this parameter as false. No one is looking at this
78 : // parameter or calling this method.
79 : // Moreover, the nsSBCSGroupProber which calls the HandleData of this
80 : // prober has a hard-coded call to FilterWithoutEnglishLetters which gets rid
81 : // of the English letters.
82 : bool KeepEnglishLetters() {return mModel->keepEnglishLetter;} // (not implemented)
83 :
84 : #ifdef DEBUG_chardet
85 : virtual void DumpStatus();
86 : #endif
87 :
88 : protected:
89 : nsProbingState mState;
90 : const SequenceModel* const mModel;
91 : const bool mReversed; // true if we need to reverse every pair in the model lookup
92 :
93 : //char order of last character
94 : unsigned char mLastOrder;
95 :
96 : PRUint32 mTotalSeqs;
97 : PRUint32 mSeqCounters[NUMBER_OF_SEQ_CAT];
98 :
99 : PRUint32 mTotalChar;
100 : //characters that fall in our sampling range
101 : PRUint32 mFreqChar;
102 :
103 : // Optional auxiliary prober for name decision. created and destroyed by the GroupProber
104 : nsCharSetProber* mNameProber;
105 :
106 : };
107 :
108 :
109 : extern const SequenceModel Koi8rModel;
110 : extern const SequenceModel Win1251Model;
111 : extern const SequenceModel Latin5Model;
112 : extern const SequenceModel MacCyrillicModel;
113 : extern const SequenceModel Ibm866Model;
114 : extern const SequenceModel Ibm855Model;
115 : extern const SequenceModel Latin7Model;
116 : extern const SequenceModel Win1253Model;
117 : extern const SequenceModel Latin5BulgarianModel;
118 : extern const SequenceModel Win1251BulgarianModel;
119 : extern const SequenceModel Latin2HungarianModel;
120 : extern const SequenceModel Win1250HungarianModel;
121 : extern const SequenceModel Win1255Model;
122 : extern const SequenceModel TIS620ThaiModel;
123 :
124 : #endif /* nsSingleByteCharSetProber_h__ */
125 :
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