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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:       PrimaveraInputStreamReader.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2011
 * date:       08/08/2011
 */

/*
 * 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.primavera;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;

import net.sf.mpxj.common.XmlHelper;

/**
 * This class creates an InputStream reader with a CharsetDecoder
 * which can be used to silently ignore incorrectly encoded characters,
 * and replace characters which are invalid for XML 1.0 with the
 * Unicode replacement character.
 */
class PrimaveraInputStreamReader extends InputStreamReader
{
   /**
    * Constructor.
    *
    * @param is input stream
    * @param charset character set name
    */
   public PrimaveraInputStreamReader(InputStream is, String charset)
   {
      super(is, decoder(charset));
   }

   @Override public int read() throws IOException
   {
      int c = super.read();
      if (!XmlHelper.validXmlChar(c))
      {
         c = XmlHelper.REPLACEMENT_CHAR;
      }
      return c;
   }

   @Override public int read(char[] cbuf, int offset, int length) throws IOException
   {
      int result = super.read(cbuf, offset, length);
      if (result > 0)
      {
         for (int index = 0; index < result; index++)
         {
            if (!XmlHelper.validXmlChar(cbuf[index]))
            {
               cbuf[index] = XmlHelper.REPLACEMENT_CHAR;
            }
         }
      }
      return result;
   }

   /**
    * Create a charset decoder which silently ignores
    * incorrectly encoded characters.
    *
    * @param charset charset name
    * @return CharsetDecoder instance
    */
   private static CharsetDecoder decoder(String charset)
   {
      CharsetDecoder decoder = Charset.forName(charset).newDecoder();
      decoder.onMalformedInput(CodingErrorAction.REPLACE);
      decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
      return decoder;
   }
}