nsEscCharsetProber.cpp

Go to the documentation of this file.

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*  -*- C++ -*-
*  Copyright (C) 1998 <developer@mozilla.org>
*
*
*  Permission is hereby granted, free of charge, to any person obtaining
*  a copy of this software and associated documentation files (the
*  "Software"), to deal in the Software without restriction, including
*  without limitation the rights to use, copy, modify, merge, publish,
*  distribute, sublicense, and/or sell copies of the Software, and to
*  permit persons to whom the Software is furnished to do so, subject to
*  the following conditions:
*
*  The above copyright notice and this permission notice shall be included 
*  in all copies or substantial portions of the Software.
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
*  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
*  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
*  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
*  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
*  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
*  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "nsEscCharsetProber.h"

namespace kencodingprober {
nsEscCharSetProber::nsEscCharSetProber(void)
{
  mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
  mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
  mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
  mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mState = eDetecting;
  mDetectedCharset = 0;
}

nsEscCharSetProber::~nsEscCharSetProber(void)
{
  for (unsigned int i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    delete mCodingSM[i];
}

void nsEscCharSetProber::Reset(void)
{
  mState = eDetecting;
  for (unsigned int i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    mCodingSM[i]->Reset();
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mDetectedCharset = 0;
}

nsProbingState nsEscCharSetProber::HandleData(const char* aBuf, unsigned int aLen)
{
  nsSMState codingState;
  int j;
  unsigned int i;

  for ( i = 0; i < aLen && mState == eDetecting; i++)
  {
    for (j = mActiveSM-1; j>= 0; j--)
    {
      //byte is feed to all active state machine 
      codingState = mCodingSM[j]->NextState(aBuf[i]);
      if (codingState == eError)
      {
        //got negative answer for this state machine, make it inactive
        mActiveSM--;
        if (mActiveSM == 0)
        {
          mState = eNotMe;
          return mState;
        }
        else if (j != (int)mActiveSM)
        {
          nsCodingStateMachine* t;
          t = mCodingSM[mActiveSM];
          mCodingSM[mActiveSM] = mCodingSM[j];
          mCodingSM[j] = t;
        }
      }
      else if (codingState == eItsMe)
      {
        mState = eFoundIt;
        mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
        return mState;
      }
    }
  }

  return mState;
}
}