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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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, uint32_t aLen) = 0;
virtual nsProbingState GetState(void) = 0;
virtual void Reset(void) = 0;
virtual float GetConfidence(void) = 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 false in case of memory allocation failure.
static bool FilterWithoutEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen);
static bool FilterWithEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen);
};
#endif /* nsCharSetProber_h__ */
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