internal void ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj)
{
if ((this._parser.State != TdsParserState.Broken) && (this._parser.State != TdsParserState.Closed))
{
IntPtr zero = IntPtr.Zero;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
uint num;
if (!this._parser.AsyncOn)
{
num = SNINativeMethodWrapper.SNIReadSync(stateObj.Handle, ref zero, TdsParserStaticMethods.GetTimeoutMilliseconds(stateObj.TimeoutTime));
if (num == 0)
{
stateObj.ProcessSniPacket(zero, 0);
}
else
{
this.ReadSniError(stateObj, num);
}
}
else
{
stateObj._asyncResult = asyncResult;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
stateObj.IncrementPendingCallbacks();
num = SNINativeMethodWrapper.SNIReadAsync(stateObj.Handle, ref zero);
if ((num != 0) && (0x3e5 != num))
{
stateObj.DecrementPendingCallbacks(false);
}
}
if (num == 0)
{
stateObj._asyncResult.SetCompletedSynchronously();
stateObj.ReadAsyncCallback(ADP.PtrZero, zero, 0);
}
else if (0x3e5 != num)
{
this.ReadSniError(stateObj, num);
}
}
}
finally
{
if (zero != IntPtr.Zero)
{
SNINativeMethodWrapper.SNIPacketRelease(zero);
}
}
}
}