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#ifndef nsCodingStateMachine_h__

#define nsCodingStateMachine_h__

#include "nsPkgInt.h"

typedef enum {

   eStart = 0,

   eError = 1,

   eItsMe = 2 

} nsSMState;

#define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)

//state machine model

typedef struct 

{

  nsPkgInt classTable;

  PRUint32 classFactor;

  nsPkgInt stateTable;

  const PRUint32* charLenTable;

  const char* name;

} SMModel;

class nsCodingStateMachine {

public:

  nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }

  nsSMState NextState(char c){

    //for each byte we get its class , if it is first byte, we also get byte length

    PRUint32 byteCls = GETCLASS(c);

    if (mCurrentState == eStart)

    { 

      mCurrentBytePos = 0; 

      mCurrentCharLen = mModel->charLenTable[byteCls];

    }

    //from byte's class and stateTable, we get its next state

    mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,

                                       mModel->stateTable);

    mCurrentBytePos++;

    return mCurrentState;

  }

  PRUint32  GetCurrentCharLen(void) {return mCurrentCharLen;}

  void      Reset(void) {mCurrentState = eStart;}

  const char * GetCodingStateMachine() {return mModel->name;}

protected:

  nsSMState mCurrentState;

  PRUint32 mCurrentCharLen;

  PRUint32 mCurrentBytePos;

  const SMModel *mModel;

};

extern const SMModel UTF8SMModel;

extern const SMModel Big5SMModel;

extern const SMModel EUCJPSMModel;

extern const SMModel EUCKRSMModel;

extern const SMModel EUCTWSMModel;

extern const SMModel GB18030SMModel;

extern const SMModel SJISSMModel;

extern const SMModel HZSMModel;

extern const SMModel ISO2022CNSMModel;

extern const SMModel ISO2022JPSMModel;

extern const SMModel ISO2022KRSMModel;

#endif /* nsCodingStateMachine_h__ */