}
	if len(crc) != c.Type.RawByteLen() {
		return b
	}
	b = append(b, tmp[:n]...)
	b = append(b, crc...)
	if c.Type.Is(ChecksumMultipart) {
		var checksums int
		if c.WantParts > 0 && !c.Type.Is(ChecksumIncludesMultipart) {
			checksums = c.WantParts
		}
		// Ensure we don't divide by 0:
		if c.Type.RawByteLen() == 0 || len(parts)%c.Type.RawByteLen() != 0 {