Byte « Development « Java Network Q&A

1. How to calculate the internet checksum from a byte[] in Java    stackoverflow.com

I'm trying to figure out how to calculate the Internet Checksum in Java and its causing me no end of pain. (I'm horrible at bit manipulation.) I found a version in ...

2. Casting a primitive vs. trimming it byte-way    stackoverflow.com

I would like to ask for opinions/advices regarding a a part of my algorithm.

ByteBuffer bb = ByteBuffer.allocate(8);
bb.putLong(rs.getLong(index));//retrieve long from db (unsigned INT)
byte[] tmp = new byte[4];
bb.position(4);
bb.get(tmp);
(Inet4Address) InetAddress.getByAddress(tmp);

ByteBuffer bb = ByteBuffer.allocate(4);
bb.putInt((int) rs.getLong(index));//retrieve ...

3. Get mimetype from byte array without external lib    stackoverflow.com

Someone know one method to get the mime type from byte array? Attention, i want to do that without external library, only native java.