/***************************************************************************
*                            BinaryMemoryWriter.cs
*                            -------------------
*   begin                : May 1, 2002
*   copyright            : (C) The RunUO Software Team
*   email                : info@runuo.com
*
*   $Id: BinaryMemoryWriter.cs 37 2006-06-19 17:28:24Z mark $
*
***************************************************************************/
/***************************************************************************
*
*   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
{
	public sealed class BinaryMemoryWriter : BinaryFileWriter
	{
		private static byte[] indexBuffer;
		private readonly 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, int serial)
		{
			Flush();

			var buffer = stream.GetBuffer();
			var length = (int)stream.Length;

			var 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;
		}
	}
}