dump data in byte buffer

Hexdump.java

import java.nio.ByteBuffer;

public class Hexdump {
  
   public static void dumphex(long offset, ByteBuffer buffer) {

        byte[] chunk = new byte[16];

        while(buffer.hasRemaining()) {

            int len = Math.min(chunk.length, buffer.remaining());
            buffer.get(chunk, 0, len);

            System.out.printf("%05x ", offset);
            int i;
            for(i = 0; i < len; i++) {
                if(i%8 == 0) {
                    // separator between 8 bytes
                    System.out.print("  "); // two spaces
                }
                System.out.printf("%02x ", chunk[i]);
            }

            if (i < 8) {
                // add missing separator
                System.out.print("  "); // two spaces
            }

            // fill missing butes for short arrays
            for (; i < chunk.length; i++) {
                System.out.print("   "); // three spaces
            }

            System.out.print("  "); // two spaces

            for(i = 0; i < len; i++) {
                int c = chunk[i];
                if (Character.isDefined(c) && !Character.isWhitespace(c)) {
                    System.out.print(Character.toString((char)chunk[i]));
                } else {
                    System.out.print('.');
                }
            }
            System.out.println();
            offset += len;

        }
    }
}