class/Npgsql/Npgsql/NpgsqlStartupPacket.cs

   1 // created on 9/6/2002 at 16:56
   2
   3
   4 // Npgsql.NpgsqlStartupPacket.cs
   5 //
   6 // Author:
   7 //      Francisco Jr. (fxjrlists@yahoo.com.br)
   8 //
   9 //      Copyright (C) 2002 The Npgsql Development Team
  10 //      npgsql-general@gborg.postgresql.org
  11 //      http://gborg.postgresql.org/project/npgsql/projdisplay.php
  12 //
  13 // This library is free software; you can redistribute it and/or
  14 // modify it under the terms of the GNU Lesser General Public
  15 // License as published by the Free Software Foundation; either
  16 // version 2.1 of the License, or (at your option) any later version.
  17 //
  18 // This library is distributed in the hope that it will be useful,
  19 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 // Lesser General Public License for more details.
  22 //
  23 // You should have received a copy of the GNU Lesser General Public
  24 // License along with this library; if not, write to the Free Software
  25 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26
  27 using System;
  28 using System.IO;
  29 using System.Text;
  30 using System.Net;
  31
  32 namespace Npgsql
  33 {
  34
  35     /// <summary>
  36     /// This class represents a StartupPacket message of PostgreSQL
  37     /// protocol.
  38     /// </summary>
  39     ///
  40     internal sealed class NpgsqlStartupPacket
  41     {
  42         // Logging related values
  43         private static readonly String CLASSNAME = "NpgsqlStartupPacket";
  44
  45         // Private fields.
  46         private Int32 packet_size;
  47         private ProtocolVersion protocol_version;
  48         private String database_name;
  49         private String user_name;
  50         private String arguments;
  51         private String unused;
  52         private String optional_tty;
  53
  54         public NpgsqlStartupPacket(Int32 packet_size,
  55                                    ProtocolVersion protocol_version,
  56                                    String database_name,
  57                                    String user_name,
  58                                    String arguments,
  59                                    String unused,
  60                                    String optional_tty)
  61         {
  62
  63             NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, CLASSNAME);
  64             // Just copy the values.
  65
  66             // [FIXME] Validate params? We are the only clients, so, hopefully, we
  67             // know what to send.
  68
  69             this.packet_size = packet_size;
  70             this.protocol_version = protocol_version;
  71
  72             this.database_name = database_name;
  73             this.user_name = user_name;
  74             this.arguments = arguments;
  75             this.unused = unused;
  76             this.optional_tty = optional_tty;
  77
  78         }
  79
  80
  81         public void WriteToStream(Stream output_stream, Encoding encoding)
  82         {
  83             NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "WriteToStream");
  84
  85             switch (protocol_version) {
  86             case ProtocolVersion.Version2 :
  87                 WriteToStream_Ver_2(output_stream, encoding);
  88                 break;
  89
  90             case ProtocolVersion.Version3 :
  91                 WriteToStream_Ver_3(output_stream, encoding);
  92                 break;
  93
  94             }
  95         }
  96
  97
  98         private void WriteToStream_Ver_2(Stream output_stream, Encoding encoding)
  99                                 {
 100             NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "WriteToStream_Ver_2");
 101
 102             // Packet length = 296
 103             output_stream.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(this.packet_size)), 0, 4);
 104
 105             output_stream.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(PGUtil.ConvertProtocolVersion(this.protocol_version))), 0, 4);
 106
 107             // Database name.
 108             PGUtil.WriteLimString(this.database_name, 64, output_stream, encoding);
 109
 110             // User name.
 111             PGUtil.WriteLimString(this.user_name, 32, output_stream, encoding);
 112
 113             // Arguments.
 114             PGUtil.WriteLimString(this.arguments, 64, output_stream, encoding);
 115
 116             // Unused.
 117             PGUtil.WriteLimString(this.unused, 64, output_stream, encoding);
 118
 119             // Optional tty.
 120             PGUtil.WriteLimString(this.optional_tty, 64, output_stream, encoding);
 121             output_stream.Flush();
 122         }
 123
 124
 125         private void WriteToStream_Ver_3(Stream output_stream, Encoding encoding)
 126         {
 127             NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "WriteToStream_Ver_3");
 128
 129             PGUtil.WriteInt32(output_stream, 4 + 4 + 5 + (encoding.GetByteCount(user_name) + 1) + 9 + (encoding.GetByteCount(database_name) + 1) + 10 + 4 + 1);
 130
 131             PGUtil.WriteInt32(output_stream, Npgsql.PGUtil.ConvertProtocolVersion(this.protocol_version));
 132
 133             // User name.
 134             PGUtil.WriteString("user", output_stream, encoding);
 135
 136             // User name.
 137             PGUtil.WriteString(user_name, output_stream, encoding);
 138
 139             // Database name.
 140             PGUtil.WriteString("database", output_stream, encoding);
 141
 142             // Database name.
 143             PGUtil.WriteString(database_name, output_stream, encoding);
 144
 145             // DateStyle.
 146             PGUtil.WriteString("DateStyle", output_stream, encoding);
 147
 148             // DateStyle.
 149             PGUtil.WriteString("ISO", output_stream, encoding);
 150
 151             output_stream.WriteByte(0);
 152             output_stream.Flush();
 153         }
 154     }
 155 }