func parseRawHeader()

in image/parse.go [73:97]

• 20 lines of code
• 4 McCabe index (conditional complexity)

func parseRawHeader(imgData []byte, offset int) (ImageHdr, int, error) {
	var hdr ImageHdr

	r := bytes.NewReader(imgData)
	r.Seek(int64(offset), io.SeekStart)

	if err := binary.Read(r, binary.LittleEndian, &hdr); err != nil {
		return hdr, 0, errors.Wrapf(err, "error reading image header")
	}

	if hdr.Magic != IMAGE_MAGIC {
		return hdr, 0, errors.Errorf(
			"image magic incorrect; expected 0x%08x, got 0x%08x",
			uint32(IMAGE_MAGIC), hdr.Magic)
	}

	remLen := len(imgData) - offset
	if remLen < int(hdr.HdrSz) {
		return hdr, 0, errors.Errorf(
			"image header incomplete; expected %d bytes, got %d bytes",
			hdr.HdrSz, remLen)
	}

	return hdr, int(hdr.HdrSz), nil
}