Function parsePushPromise

internal/http2/frame.go:1331–1369

(_ *frameCache, fh FrameHeader, countError func(string), p []byte)

}

func parsePushPromise(_ *frameCache, fh FrameHeader, countError func(string), p []byte) (_ Frame, err error) {
	pp := &PushPromiseFrame{
		FrameHeader: fh,
	}
	if pp.StreamID == 0 {
		// PUSH_PROMISE frames MUST be associated with an existing,
		// peer-initiated stream. The stream identifier of a
		// PUSH_PROMISE frame indicates the stream it is associated
		// with. If the stream identifier field specifies the value
		// 0x0, a recipient MUST respond with a connection error
		// (Section 5.4.1) of type PROTOCOL_ERROR.
		countError("frame_pushpromise_zero_stream")
		return nil, ConnectionError(ErrCodeProtocol)
	}
	// The PUSH_PROMISE frame includes optional padding.
	// Padding fields and flags are identical to those defined for DATA frames
	var padLength uint8
	if fh.Flags.Has(FlagPushPromisePadded) {
		if p, padLength, err = readByte(p); err != nil {
			countError("frame_pushpromise_pad_short")
			return
		}
	}

	p, pp.PromiseID, err = readUint32(p)
	if err != nil {
		countError("frame_pushpromise_promiseid_short")
		return
	}
	pp.PromiseID = pp.PromiseID & (1<<31 - 1)

	if int(padLength) > len(p) {
		// like the DATA frame, error out if padding is longer than the body.
		countError("frame_pushpromise_pad_too_big")
		return nil, ConnectionError(ErrCodeProtocol)
	}
	pp.headerFragBuf = p[:len(p)-int(padLength)]
	return pp, nil
}

// PushPromiseParam are the parameters for writing a PUSH_PROMISE frame.
type PushPromiseParam struct {