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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;
  uint32_t classFactor;
  nsPkgInt stateTable;
  const uint32_t* charLenTable;
  const char* name;
} SMModel;

class nsCodingStateMachine {
public:
  nsCodingStateMachine(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
    uint32_t 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;
  };
  uint32_t  GetCurrentCharLen(void) {return mCurrentCharLen;};
  void      Reset(void) {mCurrentState = eStart;};
  const char * GetCodingStateMachine() {return mModel->name;};

protected:
  nsSMState mCurrentState;
  uint32_t mCurrentCharLen;
  uint32_t mCurrentBytePos;

  SMModel *mModel;
};

extern SMModel UTF8SMModel;
extern SMModel Big5SMModel;
extern SMModel EUCJPSMModel;
extern SMModel EUCKRSMModel;
extern SMModel EUCTWSMModel;
extern SMModel GB18030SMModel;
extern SMModel SJISSMModel;
extern SMModel UCS2BESMModel;


extern SMModel HZSMModel;
extern SMModel ISO2022CNSMModel;
extern SMModel ISO2022JPSMModel;
extern SMModel ISO2022KRSMModel;

#endif /* nsCodingStateMachine_h__ */

