ModernUO/Projects/Server/Persistence/BinaryMemoryWriter.cs

/***************************************************************************
 *                            BinaryMemoryWriter.cs
 *                            -------------------
 *   begin                : May 1, 2002
 *   copyright            : (C) The RunUO Software Team
 *   email                : info@runuo.com
 *
 *   $Id$
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

using System.IO;

namespace Server.Persistence
{
  public sealed class BinaryMemoryWriter : BinaryFileWriter
  {
    private static byte[] indexBuffer;
    private MemoryStream stream;

    public BinaryMemoryWriter()
      : base(new MemoryStream(512), true) =>
      stream = UnderlyingStream as MemoryStream;

    protected override int BufferSize => 512;

    public int CommitTo(SequentialFileWriter dataFile, SequentialFileWriter indexFile, int typeCode, uint serial)
    {
      Flush();

      byte[] buffer = stream.GetBuffer();
      int length = (int)stream.Length;

      long position = dataFile.Position;

      dataFile.Write(buffer, 0, length);

      if (indexBuffer == null) indexBuffer = new byte[20];

      indexBuffer[0] = (byte)typeCode;
      indexBuffer[1] = (byte)(typeCode >> 8);
      indexBuffer[2] = (byte)(typeCode >> 16);
      indexBuffer[3] = (byte)(typeCode >> 24);

      indexBuffer[4] = (byte)serial;
      indexBuffer[5] = (byte)(serial >> 8);
      indexBuffer[6] = (byte)(serial >> 16);
      indexBuffer[7] = (byte)(serial >> 24);

      indexBuffer[8] = (byte)position;
      indexBuffer[9] = (byte)(position >> 8);
      indexBuffer[10] = (byte)(position >> 16);
      indexBuffer[11] = (byte)(position >> 24);
      indexBuffer[12] = (byte)(position >> 32);
      indexBuffer[13] = (byte)(position >> 40);
      indexBuffer[14] = (byte)(position >> 48);
      indexBuffer[15] = (byte)(position >> 56);

      indexBuffer[16] = (byte)length;
      indexBuffer[17] = (byte)(length >> 8);
      indexBuffer[18] = (byte)(length >> 16);
      indexBuffer[19] = (byte)(length >> 24);

      indexFile.Write(indexBuffer, 0, indexBuffer.Length);

      stream.SetLength(0);

      return length;
    }
  }
}