Http3Frame.cs

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namespace System.Net.Http;
 
internal static class Http3Frame
{
    public static bool TryReadIntegerPair(ReadOnlySpan<byte> buffer, out long a, out long b, out int bytesRead)
    {
        if (VariableLengthIntegerHelper.TryRead(buffer, out a, out var bytesRead2))
        {
            buffer = buffer.Slice(bytesRead2);
            if (VariableLengthIntegerHelper.TryRead(buffer, out b, out var bytesRead3))
            {
                bytesRead = bytesRead2 + bytesRead3;
                return true;
            }
        }
        b = 0L;
        bytesRead = 0;
        return false;
    }
 
    public static bool TryWriteFrameEnvelope(Http3FrameType frameType, long payloadLength, Span<byte> buffer, out int bytesWritten)
    {
        if (buffer.Length != 0)
        {
            buffer[0] = (byte)frameType;
            buffer = buffer.Slice(1);
            if (VariableLengthIntegerHelper.TryWrite(buffer, payloadLength, out var bytesWritten2))
            {
                bytesWritten = bytesWritten2 + 1;
                return true;
            }
        }
        bytesWritten = 0;
        return false;
    }
}