/// <summary>
/// Deflate the token
/// </summary>
/// <param name="destination">Stream to deflate token to</param>
public override void Deflate(Stream destination)
{
// Calculate total length by adding strings
uint totalPacketLength = (uint)(FixedPacketLength
+ (uint)(string.IsNullOrEmpty(HostName) ? 0 : HostName.Length * 2) // HostName
+ (uint)(string.IsNullOrEmpty(UserID) ? 0 : UserID.Length * 2) // UserID
+ (uint)(string.IsNullOrEmpty(Password) ? 0 : Password.Length * 2) // Password
+ (uint)(string.IsNullOrEmpty(ApplicationName) ? 0 : ApplicationName.Length * 2) // ApplicationName
+ (uint)(string.IsNullOrEmpty(ServerName) ? 0 : ServerName.Length * 2) // ServerName
+ (uint)(string.IsNullOrEmpty(LibraryName) ? 0 : LibraryName.Length * 2) // LibraryName
+ (uint)(string.IsNullOrEmpty(Language) ? 0 : Language.Length * 2) // Language
+ (uint)(string.IsNullOrEmpty(Database) ? 0 : Database.Length * 2) // Database
+ (uint)(string.IsNullOrEmpty(AttachDatabaseFile) ? 0 : AttachDatabaseFile.Length * 2) // AttachDatabaseFile
+ (uint)(string.IsNullOrEmpty(ChangePassword) ? 0 : ChangePassword.Length * 2) // ChangePassword
+ (uint)(SSPI == null ? 0 : SSPI.Length) // SSPI
+ 0); // Feature extension
MemoryStream featureExtension = null;
// Check if we have a feature extension
if (FeatureExt != null)
{
// Allocate feature extension block
featureExtension = new MemoryStream();
// Serialize feature extension
FeatureExt.Deflate(featureExtension);
// Update total lentgh
totalPacketLength += (uint)(sizeof(uint) /* Offset of feature extension data */ + featureExtension.Length /* feature extension itself*/);
}
// Write packet length
TDSUtilities.WriteUInt(destination, totalPacketLength);
// Compile TDS version
uint tdsVersion = Convert.ToUInt32(string.Format("{0:X}", Math.Max(TDSVersion.Major, 0)) + string.Format("{0:X}", Math.Max(TDSVersion.Minor, 0)) + string.Format("{0:X2}", Math.Max(TDSVersion.Build, 0)) + string.Format("{0:X4}", Math.Max(TDSVersion.Revision, 0)), 16);
// Write TDS version
TDSUtilities.WriteUInt(destination, tdsVersion);
// Write packet length
TDSUtilities.WriteUInt(destination, PacketSize);
// Write client program version
TDSUtilities.WriteUInt(destination, ClientProgramVersion);
// Write client program identifier
TDSUtilities.WriteUInt(destination, ClientPID);
// Write connection identifier
TDSUtilities.WriteUInt(destination, ConnectionID);
// Write the first optional flags
destination.WriteByte(OptionalFlags1.ToByte());
// Write the second optional flags
destination.WriteByte(OptionalFlags2.ToByte());
// Instantiate type flags
destination.WriteByte(TypeFlags.ToByte());
// Write the third optional flags
destination.WriteByte(OptionalFlags3.ToByte());
// Write client time zone
TDSUtilities.WriteInt(destination, ClientTimeZone);
// Write client locale identifier
TDSUtilities.WriteUInt(destination, ClientLCID);
// Prepare a collection of property values that will be set later
IList <TDSLogin7TokenOffsetProperty> variableProperties = new List <TDSLogin7TokenOffsetProperty>();
// Write client host name
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("HostName"), FixedPacketLength, (ushort)(string.IsNullOrEmpty(HostName) ? 0 : HostName.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write user name and password
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("UserID"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(UserID) ? 0 : UserID.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("Password"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(Password) ? 0 : Password.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write application name
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("ApplicationName"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(ApplicationName) ? 0 : ApplicationName.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write server name
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("ServerName"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(ServerName) ? 0 : ServerName.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Check if we have a feature extension block
if (FeatureExt != null)
{
// Write the offset of the feature extension offset (pointer to pointer)
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("FeatureExt"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), sizeof(uint) / 2, true)); // Should be 4 bytes, devided by 2 because the next guy multiplies by 2
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)(variableProperties.Last().Length * 2)); // Compensate for division by 2 above
}
else
{
// Skip unused
TDSUtilities.WriteUShort(destination, 0);
TDSUtilities.WriteUShort(destination, 0);
}
// Write client library name
// We do not need to account for skipped unused bytes here because they're already accounted in fixedPacketLength
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("LibraryName"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(LibraryName) ? 0 : LibraryName.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write language
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("Language"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(Language) ? 0 : Language.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write database
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("Database"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(Database) ? 0 : Database.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Check if client is defined
if (ClientID == null)
{
// Allocate empty identifier
ClientID = new byte[6];
}
// Write unique client identifier
destination.Write(ClientID, 0, 6);
// Write SSPI
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("SSPI"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(SSPI == null ? 0 : SSPI.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write database file to be attached. NOTE, "variableProperties.Last().Length" without " * 2" because the preceeding buffer isn't string
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("AttachDatabaseFile"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length), (ushort)(string.IsNullOrEmpty(AttachDatabaseFile) ? 0 : AttachDatabaseFile.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Write password change
variableProperties.Add(new TDSLogin7TokenOffsetProperty(GetType().GetProperty("ChangePassword"), (ushort)(variableProperties.Last().Position + variableProperties.Last().Length * 2), (ushort)(string.IsNullOrEmpty(ChangePassword) ? 0 : ChangePassword.Length)));
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Position);
TDSUtilities.WriteUShort(destination, (ushort)variableProperties.Last().Length);
// Skip long SSPI
TDSUtilities.WriteUInt(destination, 0);
// We will be changing collection as we go and serialize everything. As such we can't use foreach and iterator.
int iCurrentProperty = 0;
// Iterate through the collection
while (iCurrentProperty < variableProperties.Count)
{
// Get current property by index
TDSLogin7TokenOffsetProperty property = variableProperties[iCurrentProperty];
// Check if length is positive
if (property.Length == 0)
{
// Move to the next property
iCurrentProperty++;
continue;
}
// Check special properties
if (property.Property.Name == "Password" || property.Property.Name == "ChangePassword")
{
// Write encrypted string value
TDSUtilities.WritePasswordString(destination, (string)property.Property.GetValue(this, null));
}
else if (property.Property.Name == "FeatureExt")
{
// Check if we are to serialize the offset or the actual data
if (property.IsOffsetOffset)
{
// Property will be written at the offset immediately following all variable length data
property.Position = variableProperties.Last().Position + variableProperties.Last().Length;
// Write the position at which we'll be serializing the feature extension block
TDSUtilities.WriteUInt(destination, property.Position);
// Order strings in ascending order by offset
variableProperties = variableProperties.OrderBy(p => p.Position).ToList();
// Compensate increment to the next position in order to stay on the same
iCurrentProperty--;
// No longer offset, actual data is going to follow
property.IsOffsetOffset = false;
}
else
{
// Transfer deflated feature extension into the login stream
featureExtension.WriteTo(destination);
}
}
else if (property.Property.Name == "SSPI")
{
// Write SSPI
destination.Write(SSPI, 0, SSPI.Length);
}
else
{
// Write the string value
TDSUtilities.WriteString(destination, (string)property.Property.GetValue(this, null));
}
// Move to the next property
iCurrentProperty++;
}
}
