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37 : #ifndef nsCodingStateMachine_h__
38 : #define nsCodingStateMachine_h__
39 :
40 : #include "nsPkgInt.h"
41 :
42 : typedef enum {
43 : eStart = 0,
44 : eError = 1,
45 : eItsMe = 2
46 : } nsSMState;
47 :
48 : #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
49 :
50 : //state machine model
51 : typedef struct
52 : {
53 : nsPkgInt classTable;
54 : PRUint32 classFactor;
55 : nsPkgInt stateTable;
56 : const PRUint32* charLenTable;
57 : const char* name;
58 : } SMModel;
59 :
60 : class nsCodingStateMachine {
61 : public:
62 0 : nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }
63 0 : nsSMState NextState(char c){
64 : //for each byte we get its class , if it is first byte, we also get byte length
65 0 : PRUint32 byteCls = GETCLASS(c);
66 0 : if (mCurrentState == eStart)
67 : {
68 0 : mCurrentBytePos = 0;
69 0 : mCurrentCharLen = mModel->charLenTable[byteCls];
70 : }
71 : //from byte's class and stateTable, we get its next state
72 0 : mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
73 0 : mModel->stateTable);
74 0 : mCurrentBytePos++;
75 0 : return mCurrentState;
76 : }
77 0 : PRUint32 GetCurrentCharLen(void) {return mCurrentCharLen;}
78 0 : void Reset(void) {mCurrentState = eStart;}
79 0 : const char * GetCodingStateMachine() {return mModel->name;}
80 :
81 : protected:
82 : nsSMState mCurrentState;
83 : PRUint32 mCurrentCharLen;
84 : PRUint32 mCurrentBytePos;
85 :
86 : const SMModel *mModel;
87 : };
88 :
89 : extern const SMModel UTF8SMModel;
90 : extern const SMModel Big5SMModel;
91 : extern const SMModel EUCJPSMModel;
92 : extern const SMModel EUCKRSMModel;
93 : extern const SMModel EUCTWSMModel;
94 : extern const SMModel GB18030SMModel;
95 : extern const SMModel SJISSMModel;
96 :
97 :
98 : extern const SMModel HZSMModel;
99 : extern const SMModel ISO2022CNSMModel;
100 : extern const SMModel ISO2022JPSMModel;
101 : extern const SMModel ISO2022KRSMModel;
102 :
103 : #endif /* nsCodingStateMachine_h__ */
104 :
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