func()

in dax/internal/cbor/cbor.go [430:482]

• 45 lines of code
• 14 McCabe index (conditional complexity)

func (r *Reader) readRawTypeHeader(o io.Writer) (hdr int, value uint64, err error) {
	b, err := r.br.ReadByte()
	if err != nil {
		return 0, 0, err
	}

	// Use the buffer r.buf to store the header byte and write it to output writer o
	if o != nil {
		r.buf[0] = b
		if _, err = o.Write(r.buf[:1]); err != nil {
			return 0, 0, err
		}
	}

	hdr = int(b)
	c := 0

	// Read the remaining bytes and store them at buffer r.buf
	switch hdr & MinorTypeMask {
	default:
		value = uint64(hdr) & MinorTypeMask
		return // no more byte to read
	case Size8:
		c = 1
		if _, err = io.ReadFull(r.br, r.buf[:c]); err == nil {
			value = uint64(r.buf[0])
		}
	case Size16:
		c = 2
		if _, err = io.ReadFull(r.br, r.buf[:c]); err == nil {
			value = uint64(binary.BigEndian.Uint16(r.buf))
		}
	case Size32:
		c = 4
		if _, err = io.ReadFull(r.br, r.buf[:c]); err == nil {
			value = uint64(binary.BigEndian.Uint32(r.buf))
		}
	case Size64:
		c = 8
		if _, err = io.ReadFull(r.br, r.buf[:c]); err == nil {
			value = binary.BigEndian.Uint64(r.buf)
		}
	}

	// Write remaining bytes stored in r.buf to output writer o
	if o != nil {
		if _, err = o.Write(r.buf[:c]); err != nil {
			return 0, 0, err
		}
	}

	return
}