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KDECore

nsCodingStateMachine.h

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00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /*  -*- C++ -*-
00003 *  Copyright (C) 1998 <developer@mozilla.org>
00004 *
00005 *
00006 *  Permission is hereby granted, free of charge, to any person obtaining
00007 *  a copy of this software and associated documentation files (the
00008 *  "Software"), to deal in the Software without restriction, including
00009 *  without limitation the rights to use, copy, modify, merge, publish,
00010 *  distribute, sublicense, and/or sell copies of the Software, and to
00011 *  permit persons to whom the Software is furnished to do so, subject to
00012 *  the following conditions:
00013 *
00014 *  The above copyright notice and this permission notice shall be included 
00015 *  in all copies or substantial portions of the Software.
00016 *
00017 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00018 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00019 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00020 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00021 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00022 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00023 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00024 */
00025 
00026 #ifndef nsCodingStateMachine_h__
00027 #define nsCodingStateMachine_h__
00028 
00029 #include "kencodingprober.h"
00030 
00031 #include "kdemacros.h"
00032 
00033 #include "nsPkgInt.h"
00034 namespace kencodingprober {
00035 typedef enum {
00036    eStart = 0,
00037    eError = 1,
00038    eItsMe = 2 
00039 } nsSMState;
00040 
00041 #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
00042 
00043 //state machine model
00044 typedef struct 
00045 {
00046   nsPkgInt classTable;
00047   unsigned int classFactor;
00048   nsPkgInt stateTable;
00049   const unsigned int* charLenTable;
00050   const char* name;
00051 } SMModel;
00052 
00053 class KDE_NO_EXPORT nsCodingStateMachine {
00054 public:
00055   nsCodingStateMachine(SMModel* sm){
00056           mCurrentState = eStart;
00057           mModel = sm;
00058         };
00059   nsSMState NextState(char c){
00060     //for each byte we get its class KDE_NO_EXPORT , if it is first byte, we also get byte length
00061     unsigned int byteCls = GETCLASS(c);
00062     if (mCurrentState == eStart)
00063     { 
00064       mCurrentBytePos = 0; 
00065       mCurrentCharLen = mModel->charLenTable[byteCls];
00066     }
00067     //from byte's class KDE_NO_EXPORT and stateTable, we get its next state
00068     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
00069                                        mModel->stateTable);
00070     mCurrentBytePos++;
00071     return mCurrentState;
00072   };
00073   unsigned int  GetCurrentCharLen(void) {return mCurrentCharLen;};
00074   void      Reset(void) {mCurrentState = eStart;};
00075   const char * GetCodingStateMachine() {return mModel->name;};
00076 #ifdef DEBUG_PROBE
00077   const char * DumpCurrentState(){
00078     switch (mCurrentState) {
00079         case eStart:
00080             return "eStart";
00081         case eError:
00082             return "eError";
00083         case eItsMe:
00084             return "eItsMe";
00085         default:
00086             return "OK";
00087     }
00088   }
00089 #endif
00090 
00091 protected:
00092   nsSMState mCurrentState;
00093   unsigned int mCurrentCharLen;
00094   unsigned int mCurrentBytePos;
00095 
00096   SMModel *mModel;
00097 };
00098 
00099 extern KDE_NO_EXPORT SMModel UTF8SMModel;
00100 extern KDE_NO_EXPORT SMModel Big5SMModel;
00101 extern KDE_NO_EXPORT SMModel EUCJPSMModel;
00102 extern KDE_NO_EXPORT SMModel EUCKRSMModel;
00103 extern KDE_NO_EXPORT SMModel EUCTWSMModel;
00104 extern KDE_NO_EXPORT SMModel GB18030SMModel;
00105 extern KDE_NO_EXPORT SMModel SJISSMModel;
00106 extern KDE_NO_EXPORT SMModel UCS2LESMModel;
00107 extern KDE_NO_EXPORT SMModel UCS2BESMModel;
00108 
00109 
00110 extern KDE_NO_EXPORT SMModel HZSMModel;
00111 extern KDE_NO_EXPORT SMModel ISO2022CNSMModel;
00112 extern KDE_NO_EXPORT SMModel ISO2022JPSMModel;
00113 extern KDE_NO_EXPORT SMModel ISO2022KRSMModel;
00114 }
00115 #endif /* nsCodingStateMachine_h__ */
00116 

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