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 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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(SMModel* sm){
           mCurrentState = eStart;
           mCurrentCharLen = 0;
           mCurrentBytePos = 0;
           mModel = sm;
         };
   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;
 
   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__ */