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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:       VarMeta12.java
 * author:     Jon Iles
 * copyright:  (c) Packwood Software 2002-2005
 * date:       05/12/2005
 */

/*
 * 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.mpp;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Map;
import java.util.TreeMap;

/**
 * This class reads in the data from a VarMeta block. This block contains
 * meta data about variable length data items stored in a Var2Data block.
 * The meta data allows the size of the Var2Data block to be determined,
 * along with the number of data items it contains, identifiers for each item,
 * and finally the offset of each item within the block.
 */
final class VarMeta12 extends AbstractVarMeta
{
   /**
    * Constructor. Extracts that makes up this block from the input stream.
    *
    * @param is Input stream from which data is read
    * @throws IOException on file read error
    */
   VarMeta12(InputStream is)
      throws IOException
   {
      // I have one example where an otherwise valid VarMeta block
      // has zero for a magic number. MS Project reads the file OK,
      // so we'll treat zero as a valid value.
      int magic = readInt(is);
      if (magic != 0 && magic != MAGIC)
      {
         throw new IOException("Bad magic number: " + magic);
      }

      /*m_unknown1 =*/readInt(is);
      m_itemCount = readInt(is);
      /*m_unknown2 =*/readInt(is);
      /*m_unknown3 =*/readInt(is);
      m_dataSize = readInt(is);

      int[] offsets = new int[m_itemCount];

      for (int loop = 0; loop < m_itemCount; loop++)
      {
         if (is.available() < 12)
         {
            break;
         }

         Integer uniqueID = Integer.valueOf(readInt(is));
         Integer offset = Integer.valueOf(readInt(is));
         Integer type = Integer.valueOf(readShort(is));
         readShort(is); // unknown 2 bytes

         Map map = m_table.computeIfAbsent(uniqueID, k -> new TreeMap<>());
         map.put(type, offset);
         offsets[loop] = offset.intValue();
      }

      Arrays.sort(offsets);
      setOffsets(offsets);
   }

   private static final int MAGIC = 0xFADFADBA;
}