The Tor Browser: extensions/universalchardet/src/base/nsCodingStateMachine.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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__

     8 #include "mozilla/ArrayUtils.h"

    10 #include "nsPkgInt.h"

    12 typedef enum {

    13    eStart = 0,

    14    eError = 1,

    15    eItsMe = 2

    16 } nsSMState;

    18 #define GETCLASS(c) GETFROMPCK(((unsigned char)(c)), mModel->classTable)

    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;

    33 class nsCodingStateMachine {

    34 public:

    35   nsCodingStateMachine(const SMModel* sm) : mModel(sm) { mCurrentState = eStart; }

    36   nsSMState NextState(char c){

    37     //for each byte we get its class , if it is first byte, we also get byte length

    38     uint32_t byteCls = GETCLASS(c);

    39     if (mCurrentState == eStart)

    40     {

    41       mCurrentBytePos = 0;

    42       MOZ_ASSERT(byteCls < mModel->charLenTableLength);

    43       mCurrentCharLen = mModel->charLenTable[byteCls];

    44     }

    45     //from byte's class and stateTable, we get its next state

    46     mCurrentState=(nsSMState)GETFROMPCK(mCurrentState*(mModel->classFactor)+byteCls,

    47                                        mModel->stateTable);

    48     mCurrentBytePos++;

    49     return mCurrentState;

    50   }

    51   uint32_t  GetCurrentCharLen(void) {return mCurrentCharLen;}

    52   void      Reset(void) {mCurrentState = eStart;}

    53   const char * GetCodingStateMachine() {return mModel->name;}

    55 protected:

    56   nsSMState mCurrentState;

    57   uint32_t mCurrentCharLen;

    58   uint32_t mCurrentBytePos;

    60   const SMModel *mModel;

    61 };

    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;

    72 extern const SMModel HZSMModel;

    73 extern const SMModel ISO2022CNSMModel;

    74 extern const SMModel ISO2022JPSMModel;

    75 extern const SMModel ISO2022KRSMModel;

    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

    84 #endif /* nsCodingStateMachine_h__ */

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