michael@0: /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #ifndef nsCodingStateMachine_h__
michael@0: #define nsCodingStateMachine_h__
michael@0: 
michael@0: #include "mozilla/ArrayUtils.h"
michael@0:  
michael@0: #include "nsPkgInt.h"
michael@0: 
michael@0: typedef enum {
michael@0:    eStart = 0,
michael@0:    eError = 1,
michael@0:    eItsMe = 2 
michael@0: } nsSMState;
michael@0: 
michael@0: #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
michael@0: 
michael@0: //state machine model
michael@0: typedef struct 
michael@0: {
michael@0:   nsPkgInt classTable;
michael@0:   uint32_t classFactor;
michael@0:   nsPkgInt stateTable;
michael@0:   const uint32_t* charLenTable;
michael@0: #ifdef DEBUG
michael@0:   const size_t charLenTableLength;
michael@0: #endif
michael@0:   const char* name;
michael@0: } SMModel;
michael@0: 
michael@0: class nsCodingStateMachine {
michael@0: public:
michael@0:   nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }
michael@0:   nsSMState NextState(char c){
michael@0:     //for each byte we get its class , if it is first byte, we also get byte length
michael@0:     uint32_t byteCls = GETCLASS(c);
michael@0:     if (mCurrentState == eStart)
michael@0:     { 
michael@0:       mCurrentBytePos = 0; 
michael@0:       MOZ_ASSERT(byteCls < mModel->charLenTableLength);
michael@0:       mCurrentCharLen = mModel->charLenTable[byteCls];
michael@0:     }
michael@0:     //from byte's class and stateTable, we get its next state
michael@0:     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
michael@0:                                        mModel->stateTable);
michael@0:     mCurrentBytePos++;
michael@0:     return mCurrentState;
michael@0:   }
michael@0:   uint32_t  GetCurrentCharLen(void) {return mCurrentCharLen;}
michael@0:   void      Reset(void) {mCurrentState = eStart;}
michael@0:   const char * GetCodingStateMachine() {return mModel->name;}
michael@0: 
michael@0: protected:
michael@0:   nsSMState mCurrentState;
michael@0:   uint32_t mCurrentCharLen;
michael@0:   uint32_t mCurrentBytePos;
michael@0: 
michael@0:   const SMModel *mModel;
michael@0: };
michael@0: 
michael@0: extern const SMModel UTF8SMModel;
michael@0: extern const SMModel Big5SMModel;
michael@0: extern const SMModel EUCJPSMModel;
michael@0: extern const SMModel EUCKRSMModel;
michael@0: extern const SMModel EUCTWSMModel;
michael@0: extern const SMModel GB18030SMModel;
michael@0: extern const SMModel SJISSMModel;
michael@0: 
michael@0: 
michael@0: extern const SMModel HZSMModel;
michael@0: extern const SMModel ISO2022CNSMModel;
michael@0: extern const SMModel ISO2022JPSMModel;
michael@0: extern const SMModel ISO2022KRSMModel;
michael@0: 
michael@0: #undef CHAR_LEN_TABLE
michael@0: #ifdef DEBUG
michael@0: #define CHAR_LEN_TABLE(x) x, mozilla::ArrayLength(x)
michael@0: #else
michael@0: #define CHAR_LEN_TABLE(x) x
michael@0: #endif
michael@0: 
michael@0: #endif /* nsCodingStateMachine_h__ */
michael@0: