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nsCodingStateMachine.h
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00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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00037 #ifndef nsCodingStateMachine_h__
00038 #define nsCodingStateMachine_h__
00039 
00040 #include "nsPkgInt.h"
00041 
00042 typedef enum {
00043    eStart = 0,
00044    eError = 1,
00045    eItsMe = 2 
00046 } nsSMState;
00047 
00048 #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
00049 
00050 //state machine model
00051 typedef struct 
00052 {
00053   nsPkgInt classTable;
00054   PRUint32 classFactor;
00055   nsPkgInt stateTable;
00056   const PRUint32* charLenTable;
00057   const char* name;
00058 } SMModel;
00059 
00060 class nsCodingStateMachine {
00061 public:
00062   nsCodingStateMachine(SMModel* sm){
00063           mCurrentState = eStart;
00064           mModel = sm;
00065         };
00066   nsSMState NextState(char c){
00067     //for each byte we get its class , if it is first byte, we also get byte length
00068     PRUint32 byteCls = GETCLASS(c);
00069     if (mCurrentState == eStart)
00070     { 
00071       mCurrentBytePos = 0; 
00072       mCurrentCharLen = mModel->charLenTable[byteCls];
00073     }
00074     //from byte's class and stateTable, we get its next state
00075     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
00076                                        mModel->stateTable);
00077     mCurrentBytePos++;
00078     return mCurrentState;
00079   };
00080   PRUint32  GetCurrentCharLen(void) {return mCurrentCharLen;};
00081   void      Reset(void) {mCurrentState = eStart;};
00082   const char * GetCodingStateMachine() {return mModel->name;};
00083 
00084 protected:
00085   nsSMState mCurrentState;
00086   PRUint32 mCurrentCharLen;
00087   PRUint32 mCurrentBytePos;
00088 
00089   SMModel *mModel;
00090 };
00091 
00092 extern SMModel UTF8SMModel;
00093 extern SMModel Big5SMModel;
00094 extern SMModel EUCJPSMModel;
00095 extern SMModel EUCKRSMModel;
00096 extern SMModel EUCTWSMModel;
00097 extern SMModel GB18030SMModel;
00098 extern SMModel SJISSMModel;
00099 extern SMModel UCS2BESMModel;
00100 
00101 
00102 extern SMModel HZSMModel;
00103 extern SMModel ISO2022CNSMModel;
00104 extern SMModel ISO2022JPSMModel;
00105 extern SMModel ISO2022KRSMModel;
00106 
00107 #endif /* nsCodingStateMachine_h__ */
00108