/// <summary>
/// Determines whether is connect method.
/// </summary>
/// <param name="clientStream">The client stream.</param>
/// <returns>1: when CONNECT, 0: when valid HTTP method, -1: otherwise</returns>
internal static async Task <int> IsConnectMethod(CustomBufferedStream clientStream)
{
bool isConnect = true;
int legthToCheck = 10;
for (int i = 0; i < legthToCheck; i++)
{
int b = await clientStream.PeekByteAsync(i);
if (b == -1)
{
return(-1);
}
if (b == ' ' && i > 2)
{
// at least 3 letters and a space
return(isConnect ? 1 : 0);
}
char ch = (char)b;
if (!char.IsLetter(ch))
{
// non letter or too short
return(-1);
}
if (i > 6 || ch != "CONNECT"[i])
{
isConnect = false;
}
}
// only letters
return(isConnect ? 1 : 0);
}
public async Task <bool> EnsureBufferLength(int length)
{
var val = await baseStream.PeekByteAsync(Position + length - 1);
return(val != -1);
}