// created on 10/6/2002 at 21:33

// Npgsql.NpgsqlPasswordPacket.cs
//
// Author:
//	Francisco Jr. (fxjrlists@yahoo.com.br)
//
//	Copyright (C) 2002 The Npgsql Development Team
//	npgsql-general@gborg.postgresql.org
//	http://gborg.postgresql.org/project/npgsql/projdisplay.php
//
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
// 
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
// 
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.


using System;
using System.IO;
using System.Reflection;

namespace Npgsql
{
	/// <summary>
	/// This class represents a PasswordPacket message sent to backend
	/// PostgreSQL.
	/// </summary>
	internal sealed class NpgsqlPasswordPacket : ClientMessage
	{
		// Logging related values
		private static readonly String CLASSNAME = MethodBase.GetCurrentMethod().DeclaringType.Name;

		private readonly byte[] password;
		private readonly ProtocolVersion protocolVersion;


		public NpgsqlPasswordPacket(byte[] password, ProtocolVersion protocolVersion)
		{
			NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, CLASSNAME);

			this.password = password;
			this.protocolVersion = protocolVersion;
		}

		public override void WriteToStream(Stream outputStream)
		{
			NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "WriteToStream");

			switch (protocolVersion)
			{
				case ProtocolVersion.Version2:
					// Write the size of the packet.
					// 4 + (passwordlength + 1) -> Int32 + NULL terminated string.
					// output_stream.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(4 + (password.Length + 1))), 0, 4);
					PGUtil.WriteInt32(outputStream, 4 + password.Length + 1);

					// Write String.
					PGUtil.WriteBytes(password, outputStream);

					break;

				case ProtocolVersion.Version3:
					outputStream.WriteByte((Byte) 'p');
					PGUtil.WriteInt32(outputStream, 4 + password.Length + 1);

					// Write String.
					PGUtil.WriteBytes(password, outputStream);

					break;
			}
		}
	}
}
