extensions/universalchardet/src/base/nsCodingStateMachine.h

   1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37 #ifndef nsCodingStateMachine_h__
  38 #define nsCodingStateMachine_h__
  39
  40 #include "nsPkgInt.h"
  41
  42 typedef enum {
  43    eStart = 0,
  44    eError = 1,
  45    eItsMe = 2
  46 } nsSMState;
  47
  48 #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)
  49
  50 //state machine model
  51 typedef struct
  52 {
  53   nsPkgInt classTable;
  54   PRUint32 classFactor;
  55   nsPkgInt stateTable;
  56   const PRUint32* charLenTable;
  57   const char* name;
  58 } SMModel;
  59
  60 class nsCodingStateMachine {
  61 public:
  62   nsCodingStateMachine(SMModel* sm){
  63           mCurrentState = eStart;
  64           mModel = sm;
  65         }
  66   nsSMState NextState(char c){
  67     //for each byte we get its class , if it is first byte, we also get byte length
  68     PRUint32 byteCls = GETCLASS(c);
  69     if (mCurrentState == eStart)
  70     {
  71       mCurrentBytePos = 0;
  72       mCurrentCharLen = mModel->charLenTable[byteCls];
  73     }
  74     //from byte's class and stateTable, we get its next state
  75     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,
  76                                        mModel->stateTable);
  77     mCurrentBytePos++;
  78     return mCurrentState;
  79   }
  80   PRUint32  GetCurrentCharLen(void) {return mCurrentCharLen;}
  81   void      Reset(void) {mCurrentState = eStart;}
  82   const char * GetCodingStateMachine() {return mModel->name;}
  83
  84 protected:
  85   nsSMState mCurrentState;
  86   PRUint32 mCurrentCharLen;
  87   PRUint32 mCurrentBytePos;
  88
  89   SMModel *mModel;
  90 };
  91
  92 extern SMModel UTF8SMModel;
  93 extern SMModel Big5SMModel;
  94 extern SMModel EUCJPSMModel;
  95 extern SMModel EUCKRSMModel;
  96 extern SMModel EUCTWSMModel;
  97 extern SMModel GB18030SMModel;
  98 extern SMModel SJISSMModel;
  99
 100
 101 extern SMModel HZSMModel;
 102 extern SMModel ISO2022CNSMModel;
 103 extern SMModel ISO2022JPSMModel;
 104 extern SMModel ISO2022KRSMModel;
 105
 106 #endif /* nsCodingStateMachine_h__ */
 107