/// <summary>
/// Inflate the token
/// NOTE: This operation is not continuable and assumes that the entire token is available in the stream
/// </summary>
/// <param name="source">Stream to inflate the token from</param>
/// <returns>TRUE if inflation is complete</returns>
public override bool Inflate(Stream source)
{
// We skip the token identifier because it is read by token factory
// Read token length
ushort tokenLength = TDSUtilities.ReadUShort(source);
// Check if length can accomodate at least the type
if (tokenLength == 0)
{
// We're done inflating this token
return true;
}
// Read the token type
Type = (TDSEnvChangeTokenType)source.ReadByte();
// Update the token length left
tokenLength--;
// Check if we can squeez anything else
if (tokenLength == 0)
{
// We're done inflating this token
return true;
}
// Read the rest of the token based on the token type
switch (Type)
{
case TDSEnvChangeTokenType.Database:
case TDSEnvChangeTokenType.Language:
case TDSEnvChangeTokenType.CharacterSet:
case TDSEnvChangeTokenType.PacketSize:
case TDSEnvChangeTokenType.RealTimeLogShipping:
{
// Read new value length
byte valueLength = (byte)source.ReadByte();
// Update token length
tokenLength--;
// Read string of the specified size
NewValue = TDSUtilities.ReadString(source, (ushort)(valueLength * 2));
// Update token length
tokenLength -= (ushort)(valueLength * 2);
// Check if old value can fit in
if (tokenLength == 0)
{
// Old value won't fit in
break;
}
// Read old value length
valueLength = (byte)source.ReadByte();
// Update token length
tokenLength--;
// Read string of the specified size
OldValue = TDSUtilities.ReadString(source, (ushort)(valueLength * 2));
// Update token length
tokenLength -= (ushort)(valueLength * 2);
// Inflation is complete
break;
}
case TDSEnvChangeTokenType.Routing:
{
// Read the new value length
ushort valueLength = TDSUtilities.ReadUShort(source);
// Update token length
tokenLength -= 2; // sizeof(ushort)
// Instantiate new value
NewValue = new TDSRoutingEnvChangeTokenValue();
// Inflate new value
if (!(NewValue as TDSRoutingEnvChangeTokenValue).Inflate(source))
{
// We should never reach this point
throw new Exception("Routing information inflation failed");
}
// Read always-zero old value unsigned short
if (TDSUtilities.ReadUShort(source) != 0)
{
// We should never reach this point
throw new Exception("Non-zero old value for routing information");
}
break;
}
case TDSEnvChangeTokenType.SQLCollation:
{
// Read new value length
byte valueLength = (byte)source.ReadByte();
// Update token length
tokenLength--;
// Check if old value can fit in
if (tokenLength == 0)
{
// Old value won't fit in
break;
}
// Allocate the buffer
byte[] byteValue = new byte[valueLength];
// Read bytes off the wire
source.Read(byteValue, 0, byteValue.Length);
// Set new value
NewValue = byteValue;
// Update token length
tokenLength -= valueLength;
// Check if old value can fit in
if (tokenLength == 0)
{
// Old value won't fit in
break;
}
// Read old value length
valueLength = (byte)source.ReadByte();
// Update token length
tokenLength--;
// Check if old value can fit in
if (tokenLength == 0)
{
// Old value won't fit in
break;
}
// Allocate the buffer
byteValue = new byte[valueLength];
// Read bytes off the wire
source.Read(byteValue, 0, byteValue.Length);
// Set old value
OldValue = byteValue;
// Update token length
tokenLength -= valueLength;
// Inflation is complete
break;
}
default:
{
// Skip the rest of the token
byte[] tokenData = new byte[tokenLength];
source.Read(tokenData, 0, tokenData.Length);
break;
}
}
return true;
}
/// <summary>
/// Create a new instance of the routing token that instructs client according to the routing destination URL
/// </summary>
protected TDSPacketToken CreateRoutingToken()
{
// Cast to routing server arguments
RoutingTDSServerArguments ServerArguments = Arguments as RoutingTDSServerArguments;
// Construct routing token value
TDSRoutingEnvChangeTokenValue routingInfo = new TDSRoutingEnvChangeTokenValue();
// Read the values and populate routing info
routingInfo.Protocol = (TDSRoutingEnvChangeTokenValueType)ServerArguments.RoutingProtocol;
routingInfo.ProtocolProperty = ServerArguments.RoutingTCPPort;
routingInfo.AlternateServer = ServerArguments.RoutingTCPHost;
// Construct routing token
return new TDSEnvChangeToken(TDSEnvChangeTokenType.Routing, routingInfo);
}