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