/// <summary>
/// Determines whether the stream starts with the given string.
/// </summary>
/// <param name="clientStreamReader">The client stream reader.</param>
/// <param name="expectedStart">The expected start.</param>
/// <returns>
/// 1: when starts with the given string, 0: when valid HTTP method, -1: otherwise
/// </returns>
private static async Task <int> startsWith(ICustomStreamReader clientStreamReader, string expectedStart)
{
bool isExpected = true;
int legthToCheck = 10;
for (int i = 0; i < legthToCheck; i++)
{
int b = await clientStreamReader.PeekByteAsync(i);
if (b == -1)
{
return(-1);
}
if (b == ' ' && i > 2)
{
return(isExpected ? 1 : 0);
}
char ch = (char)b;
if (!char.IsLetter(ch))
{
return(-1);
}
if (i >= expectedStart.Length || ch != expectedStart[i])
{
isExpected = false;
}
}
// only letters
return(isExpected ? 1 : 0);
}
internal async Task <bool> EnsureBufferLength(int length, CancellationToken cancellationToken)
{
var val = await baseStream.PeekByteAsync(Position + length - 1, cancellationToken);
return(val != -1);
}
public Task <int> PeekByteAsync(int index, CancellationToken cancellationToken = default)
{
return(reader.PeekByteAsync(index, cancellationToken));
}