Aegisub/universalchardet/nsCharSetProber.h

77 lines
3.1 KiB
C++

/* -*- 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 nsCharSetProber_h__
#define nsCharSetProber_h__
#include "nscore.h"
//#define DEBUG_chardet // Uncomment this for debug dump.
typedef enum {
eDetecting = 0, //We are still detecting, no sure answer yet, but caller can ask for confidence.
eFoundIt = 1, //That's a positive answer
eNotMe = 2 //Negative answer
} nsProbingState;
#define SHORTCUT_THRESHOLD (float)0.95
class nsCharSetProber {
public:
virtual ~nsCharSetProber() {};
virtual const char* GetCharSetName() = 0;
virtual nsProbingState HandleData(const char* aBuf, PRUint32 aLen) = 0;
virtual nsProbingState GetState(void) = 0;
virtual void Reset(void) = 0;
virtual float GetConfidence(void) = 0;
virtual void SetOpion() = 0;
#ifdef DEBUG_chardet
virtual void DumpStatus() {};
#endif
// Helper functions used in the Latin1 and Group probers.
// both functions Allocate a new buffer for newBuf. This buffer should be
// freed by the caller using PR_FREEIF.
// Both functions return PR_FALSE in case of memory allocation failure.
static PRBool FilterWithoutEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen);
static PRBool FilterWithEnglishLetters(const char* aBuf, PRUint32 aLen, char** newBuf, PRUint32& newLen);
};
#endif /* nsCharSetProber_h__ */