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Library that provides facilities to allow project information to be manipulated in Java and .Net. Supports a range of data formats: Microsoft Project Exchange (MPX), Microsoft Project (MPP,MPT), Microsoft Project Data Interchange (MSPDI XML), Microsoft Project Database (MPD), Planner (XML), Primavera (PM XML, XER, and database), Asta Powerproject (PP, MDB), Asta Easyplan (PP), Phoenix Project Manager (PPX), FastTrack Schedule (FTS), and the Standard Data Exchange Format (SDEF).

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/*
 * file:       SearchableInputStream.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2017
 * date:       24/04/2017
 */

/*
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

package net.sf.mpxj.projectlibre;

import java.io.IOException;
import java.io.InputStream;

/**
 * Search through the input stream until the pattern is found, the acts as a normal input stream from that point.
 */
public class SearchableInputStream extends InputStream
{
   /**
    * Constructor.
    *
    * @param stream original input stream
    * @param pattern pattern to locate
    */
   public SearchableInputStream(InputStream stream, String pattern)
   {
      m_stream = stream;
      m_pattern = pattern.getBytes();
   }

   @Override public int read() throws IOException
   {
      int c;

      if (m_searching)
      {
         int index = 0;
         c = -1;
         while (m_searching)
         {
            c = m_stream.read();
            if (c == -1)
            {
               m_searchFailed = true;
               throw new IOException("Pattern not found");
            }

            if (c == m_pattern[index])
            {
               ++index;
               if (index == m_pattern.length)
               {
                  m_searching = false;
                  c = m_stream.read();
               }
            }
            else
            {
               index = 0;
            }
         }
      }
      else
      {
         c = m_stream.read();
      }

      return c;
   }

   /**
    * Returns true if the search failed.
    *
    * @return Boolean flag
    */
   public boolean getSearchFailed()
   {
      return m_searchFailed;
   }

   private final InputStream m_stream;
   private final byte[] m_pattern;
   private boolean m_searching = true;
   private boolean m_searchFailed;
}