Method readFrom

frameHeader.go:180–222

TODO: Delete rb?

(br *bufio.Reader)

// TODO: Delete rb?
func (f *FrameHeader) readFrom(br *bufio.Reader) (int64, error) {
	header, err := br.Peek(DefaultFrameSize)
	if err != nil {
		return -1, err
	}

	_, _ = br.Discard(DefaultFrameSize)

	rn := int64(DefaultFrameSize)

	// Parsing FrameHeader's Header field.
	f.parseValues(header)
	if err = f.checkLen(); err != nil {
		return 0, err
	}

	if f.kind > FrameContinuation {
		_, _ = br.Discard(f.length)
		return 0, ErrUnknownFrameType
	}
	f.fr = AcquireFrame(f.kind)

	// if max > 0 && frh.length > max {
	// TODO: Discard bytes and return an error
	if f.length > 0 {
		n := f.length
		if n < 0 {
			panic(fmt.Sprintf("length is less than 0 (%d). Overflow? (%d)", n, f.length))
		}

		f.payload = http2utils.Resize(f.payload, n)

		n, err = io.ReadFull(br, f.payload[:n])
		if err != nil {
			ReleaseFrame(f.fr)
			return 0, err
		}

		rn += int64(n)
	}

	return rn, f.fr.Deserialize(f)
}

// WriteTo writes frame to the Writer.
//