public static HTTP2FrameHeaderAndPayload CreateWindowUpdateFrame(UInt32 streamId, UInt32 windowSizeIncrement)
{
// https://httpwg.org/specs/rfc7540.html#WINDOW_UPDATE
HTTP2FrameHeaderAndPayload frame = new HTTP2FrameHeaderAndPayload();
frame.Type = HTTP2FrameTypes.WINDOW_UPDATE;
frame.Flags = 0;
frame.StreamId = streamId;
frame.Payload = BufferPool.Get(4, true);
frame.PayloadLength = 4;
BufferHelper.SetBit(0, 0, 0);
BufferHelper.SetUInt31(frame.Payload, 0, windowSizeIncrement);
return(frame);
}
// This method encodes a string without huffman encoding
private static void EncodeRawStringTo(string str, byte[] buffer, ref UInt32 offset)
{
uint requiredBytesForStr = (uint)System.Text.Encoding.UTF8.GetByteCount(str);
int requiredBytesForLengthPrefix = RequiredBytesToEncodeInteger((UInt32)requiredBytesForStr, 7);
UInt32 originalOffset = offset;
buffer[offset] = 0;
EncodeInteger(requiredBytesForStr, 7, buffer, ref offset);
// Zero out the huffman flag
buffer[originalOffset] = BufferHelper.SetBit(buffer[originalOffset], 0, false);
if (offset != originalOffset + requiredBytesForLengthPrefix)
{
throw new Exception(string.Format("offset({0}) != originalOffset({1}) + requiredBytesForLengthPrefix({1})", offset, originalOffset, requiredBytesForLengthPrefix));
}
System.Text.Encoding.UTF8.GetBytes(str, 0, str.Length, buffer, (int)offset);
offset += requiredBytesForStr;
}
private static void AddCodePointToBuffer(HuffmanEncoder.TableEntry code, byte[] buffer, ref UInt32 offset, ref byte bufferBitIdx, bool finishOnBoundary = false)
{
for (byte codeBitIdx = 1; codeBitIdx <= code.Bits; ++codeBitIdx)
{
byte bit = code.GetBitAtIdx(codeBitIdx);
buffer[offset] = BufferHelper.SetBit(buffer[offset], bufferBitIdx, bit);
// octet boundary reached, proceed to the next octet
if (++bufferBitIdx == 8)
{
if (++offset < buffer.Length)
{
buffer[offset] = 0;
}
if (finishOnBoundary)
{
return;
}
bufferBitIdx = 0;
}
}
}
