105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsCodingStateMachine_h__
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#define nsCodingStateMachine_h__
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#include "nsPkgInt.h"
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typedef enum {
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eStart = 0,
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eError = 1,
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eItsMe = 2
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} nsSMState;
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#define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
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//state machine model
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typedef struct
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{
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nsPkgInt classTable;
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uint32_t classFactor;
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nsPkgInt stateTable;
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const uint32_t* charLenTable;
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const char* name;
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} SMModel;
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class nsCodingStateMachine {
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public:
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nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }
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nsSMState NextState(char c){
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//for each byte we get its class , if it is first byte, we also get byte length
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uint32_t byteCls = GETCLASS(c);
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if (mCurrentState == eStart)
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{
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mCurrentBytePos = 0;
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mCurrentCharLen = mModel->charLenTable[byteCls];
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}
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//from byte's class and stateTable, we get its next state
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mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
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mModel->stateTable);
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mCurrentBytePos++;
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return mCurrentState;
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}
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uint32_t GetCurrentCharLen(void) {return mCurrentCharLen;}
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void Reset(void) {mCurrentState = eStart;}
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const char * GetCodingStateMachine() {return mModel->name;}
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protected:
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nsSMState mCurrentState;
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uint32_t mCurrentCharLen;
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uint32_t mCurrentBytePos;
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const SMModel *mModel;
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};
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extern const SMModel UTF8SMModel;
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extern const SMModel Big5SMModel;
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extern const SMModel EUCJPSMModel;
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extern const SMModel EUCKRSMModel;
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extern const SMModel EUCTWSMModel;
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extern const SMModel GB18030SMModel;
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extern const SMModel SJISSMModel;
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extern const SMModel HZSMModel;
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extern const SMModel ISO2022CNSMModel;
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extern const SMModel ISO2022JPSMModel;
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extern const SMModel ISO2022KRSMModel;
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#endif /* nsCodingStateMachine_h__ */
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