// 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
//
//
// 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


using System;
using System.IO;
using System.Text;
using System.Net;

namespace Npgsql
{
    /// <summary>
    /// This class represents a PasswordPacket message sent to backend
    /// PostgreSQL.
    /// </summary>
    internal sealed class NpgsqlPasswordPacket
    {
        // Logging related values
        private static readonly String CLASSNAME = "NpgsqlPasswordPacket";

        private String password;
        private ProtocolVersion protocolVersion;


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

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

        public void WriteToStream(Stream outputStream, Encoding encoding)
        {
            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 + encoding.GetByteCount(password) + 1);

                // Write String.
                PGUtil.WriteString(password, outputStream, encoding);

                break;

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

                // Write String.
                PGUtil.WriteString(password, outputStream, encoding);

                break;

            }
        }
    }
}