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
29 : * of those above. If you wish to allow use of your version of this file only
30 : * under the terms of either the GPL or the LGPL, and not to allow others to
31 : * use your version of this file under the terms of the MPL, indicate your
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 nsCharSetProber_h__
39 : #define nsCharSetProber_h__
40 :
41 : #include "nscore.h"
42 :
43 : //#define DEBUG_chardet // Uncomment this for debug dump.
44 :
45 : typedef enum {
46 : eDetecting = 0, //We are still detecting, no sure answer yet, but caller can ask for confidence.
47 : eFoundIt = 1, //That's a positive answer
48 : eNotMe = 2 //Negative answer
49 : } nsProbingState;
50 :
51 : #define SHORTCUT_THRESHOLD (float)0.95
52 :
53 0 : class nsCharSetProber {
54 : public:
55 0 : virtual ~nsCharSetProber() {}
56 : virtual const char* GetCharSetName() = 0;
57 : virtual nsProbingState HandleData(const char* aBuf, PRUint32 aLen) = 0;
58 : virtual nsProbingState GetState(void) = 0;
59 : virtual void Reset(void) = 0;
60 : virtual float GetConfidence(void) = 0;
61 : virtual void SetOpion() = 0;
62 :
63 : #ifdef DEBUG_chardet
64 : virtual void DumpStatus() {};
65 : #endif
66 :
67 : // Helper functions used in the Latin1 and Group probers.
68 : // both functions Allocate a new buffer for newBuf. This buffer should be
69 : // freed by the caller using PR_FREEIF.
70 : // Both functions return false in case of memory allocation failure.
71 : static bool FilterWithoutEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen);
72 : static bool FilterWithEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen);
73 :
74 : };
75 :
76 : #endif /* nsCharSetProber_h__ */
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