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uchardet-enhanced / libcharsetdetect / mozilla / extensions / universalchardet / src / base / nsEscCharsetProber.cpp

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */


#include "nsEscCharsetProber.h"
#include "nsUniversalDetector.h"

nsEscCharSetProber::nsEscCharSetProber(PRUint32 aLanguageFilter)
{
  for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    mCodingSM[i] = nsnull;
  if (aLanguageFilter & NS_FILTER_CHINESE_SIMPLIFIED) 
  {
    mCodingSM[0] = new nsCodingStateMachine(&HZSMModel);
    mCodingSM[1] = new nsCodingStateMachine(&ISO2022CNSMModel);
  }
  if (aLanguageFilter & NS_FILTER_JAPANESE)
    mCodingSM[2] = new nsCodingStateMachine(&ISO2022JPSMModel);
  if (aLanguageFilter & NS_FILTER_KOREAN)
    mCodingSM[3] = new nsCodingStateMachine(&ISO2022KRSMModel);
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mState = eDetecting;
  mDetectedCharset = nsnull;
}

nsEscCharSetProber::~nsEscCharSetProber(void)
{
  for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    delete mCodingSM[i];
}

void nsEscCharSetProber::Reset(void)
{
  mState = eDetecting;
  for (PRUint32 i = 0; i < NUM_OF_ESC_CHARSETS; i++)
    if (mCodingSM[i])
      mCodingSM[i]->Reset();
  mActiveSM = NUM_OF_ESC_CHARSETS;
  mDetectedCharset = nsnull;
}

nsProbingState nsEscCharSetProber::HandleData(const char* aBuf, PRUint32 aLen)
{
  nsSMState codingState;
  PRInt32 j;
  PRUint32 i;

  for ( i = 0; i < aLen && mState == eDetecting; i++)
  {
    for (j = mActiveSM-1; j>= 0; j--)
    {
      if (mCodingSM[j])
      {
        codingState = mCodingSM[j]->NextState(aBuf[i]);
        if (codingState == eItsMe)
        {
          mState = eFoundIt;
          mDetectedCharset = mCodingSM[j]->GetCodingStateMachine();
          return mState;
        }
      }
    }
  }

  return mState;
}