Line data    Source code

       1             : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : #ifndef nsCodingStateMachine_h__
       6             : #define nsCodingStateMachine_h__
       7             : 
       8             : #include "mozilla/ArrayUtils.h"
       9             : 
      10             : #include "nsPkgInt.h"
      11             : 
      12             : typedef enum {
      13             :    eStart = 0,
      14             :    eError = 1,
      15             :    eItsMe = 2
      16             : } nsSMState;
      17             : 
      18             : #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
      19             : 
      20             : //state machine model
      21             : typedef struct
      22             : {
      23             :   nsPkgInt classTable;
      24             :   uint32_t classFactor;
      25             :   nsPkgInt stateTable;
      26             :   const uint32_t* charLenTable;
      27             : #ifdef DEBUG
      28             :   const size_t charLenTableLength;
      29             : #endif
      30             :   const char* name;
      31             : } SMModel;
      32             : 
      33             : class nsCodingStateMachine {
      34             : public:
      35           0 :   explicit nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }
      36           0 :   nsSMState NextState(char c){
      37             :     //for each byte we get its class , if it is first byte, we also get byte length
      38           0 :     uint32_t byteCls = GETCLASS(c);
      39           0 :     if (mCurrentState == eStart)
      40             :     {
      41           0 :       mCurrentBytePos = 0;
      42           0 :       MOZ_ASSERT(byteCls < mModel->charLenTableLength);
      43           0 :       mCurrentCharLen = mModel->charLenTable[byteCls];
      44             :     }
      45             :     //from byte's class and stateTable, we get its next state
      46           0 :     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
      47             :                                        mModel->stateTable);
      48           0 :     mCurrentBytePos++;
      49           0 :     return mCurrentState;
      50             :   }
      51           0 :   uint32_t  GetCurrentCharLen(void) {return mCurrentCharLen;}
      52           0 :   void      Reset(void) {mCurrentState = eStart;}
      53           0 :   const char * GetCodingStateMachine() {return mModel->name;}
      54             : 
      55             : protected:
      56             :   nsSMState mCurrentState;
      57             :   uint32_t mCurrentCharLen;
      58             :   uint32_t mCurrentBytePos;
      59             : 
      60             :   const SMModel *mModel;
      61             : };
      62             : 
      63             : extern const SMModel UTF8SMModel;
      64             : extern const SMModel Big5SMModel;
      65             : extern const SMModel EUCJPSMModel;
      66             : extern const SMModel EUCKRSMModel;
      67             : extern const SMModel EUCTWSMModel;
      68             : extern const SMModel GB18030SMModel;
      69             : extern const SMModel SJISSMModel;
      70             : 
      71             : 
      72             : extern const SMModel HZSMModel;
      73             : extern const SMModel ISO2022CNSMModel;
      74             : extern const SMModel ISO2022JPSMModel;
      75             : extern const SMModel ISO2022KRSMModel;
      76             : 
      77             : #undef CHAR_LEN_TABLE
      78             : #ifdef DEBUG
      79             : #define CHAR_LEN_TABLE(x) x, mozilla::ArrayLength(x)
      80             : #else
      81             : #define CHAR_LEN_TABLE(x) x
      82             : #endif
      83             : 
      84             : #endif /* nsCodingStateMachine_h__ */
      85             :