/*  -*- C++ -*-
*  Copyright (C) 1998 <developer@mozilla.org>
*
*
*  Permission is hereby granted, free of charge, to any person obtaining
*  a copy of this software and associated documentation files (the
*  "Software"), to deal in the Software without restriction, including
*  without limitation the rights to use, copy, modify, merge, publish,
*  distribute, sublicense, and/or sell copies of the Software, and to
*  permit persons to whom the Software is furnished to do so, subject to
*  the following conditions:
*
*  The above copyright notice and this permission notice shall be included
*  in all copies or substantial portions of the Software.
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
*  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
*  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
*  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
*  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef nsCharSetProber_h__
#define nsCharSetProber_h__

#include "kencodingprober.h"

namespace kencodingprober
{
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 KCODECS_NO_EXPORT nsCharSetProber
{
public:
    virtual ~nsCharSetProber() {};
    virtual const char *GetCharSetName() = 0;
    virtual nsProbingState HandleData(const char *aBuf, unsigned int aLen) = 0;
    virtual nsProbingState GetState(void) = 0;
    virtual void      Reset(void)  = 0;
    virtual float     GetConfidence(void) = 0;
    virtual void      SetOpion() = 0;

#ifdef DEBUG_PROBE
    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 false in case of memory allocation failure.
    static bool FilterWithoutEnglishLetters(const char *aBuf, unsigned int aLen, char **newBuf, unsigned int &newLen);
    static bool FilterWithEnglishLetters(const char *aBuf, unsigned int aLen, char **newBuf, unsigned int &newLen);

};
}
#endif /* nsCharSetProber_h__ */
