nsSJISProber.h

/*
    The Original Code is mozilla.org code.
 
    SPDX-FileCopyrightText: 1998 Netscape Communications Corporation
 
    SPDX-License-Identifier: MPL-1.1 OR GPL-2.0-or-later OR LGPL-2.1-or-later
*/
 
// for S-JIS encoding, observe characteristic:
// 1, kana character (or hankaku?) often have high frequency of appearance
// 2, kana character often exist in group
// 3, certain combination of kana is never used in japanese language
 
#ifndef nsSJISProber_h__
#define nsSJISProber_h__
 
#include "CharDistribution.h"
#include "JpCntx.h"
#include "nsCharSetProber.h"
#include "nsCodingStateMachine.h"
 
namespace kencodingprober
{
class KCODECS_NO_EXPORT nsSJISProber : public nsCharSetProber
{
public:
    nsSJISProber(void)
    {
        mCodingSM = new nsCodingStateMachine(&SJISSMModel);
        Reset();
    }
    ~nsSJISProber(void) override
    {
        delete mCodingSM;
    }
    nsProbingState HandleData(const char *aBuf, unsigned int aLen) override;
    const char *GetCharSetName() override
    {
        return "Shift_JIS";
    }
    nsProbingState GetState(void) override
    {
        return mState;
    }
    void Reset(void) override;
    float GetConfidence(void) override;
    void SetOpion() override
    {
    }
 
protected:
    nsCodingStateMachine *mCodingSM;
    nsProbingState mState;
 
    SJISContextAnalysis mContextAnalyser;
    SJISDistributionAnalysis mDistributionAnalyser;
 
    char mLastChar[2];
};
}
 
#endif /* nsSJISProber_h__ */