Java ByteBuffer to Hex toHex(ByteBuffer data)

Description

Convert data from given ByteBuffer to hex

License

Open Source License

Parameter

Parameter	Description
data	a parameter

Return

hex

Declaration

public static String toHex(ByteBuffer data) 

Method Source Code

//package com.java2s;
import java.nio.ByteBuffer;

public class Main {
    /**/*w  w  w.j  av  a  2  s . com*/
     * Convert data from given ByteBuffer to hex
     *
     * @param data
     * @return hex
     */
    public static String toHex(ByteBuffer data) {
        StringBuilder result = new StringBuilder();
        int counter = 0;
        int b;
        while (data.hasRemaining()) {
            if (counter % 16 == 0)
                result.append(String.format("%04X: ", counter));

            b = data.get() & 0xff;
            result.append(String.format("%02X ", b));

            counter++;
            if (counter % 16 == 0) {
                result.append("  ");
                toText(data, result, 16);
                result.append("\n");
            }
        }
        int rest = counter % 16;
        if (rest > 0) {
            for (int i = 0; i < 17 - rest; i++) {
                result.append("   ");
            }
            toText(data, result, rest);
        }
        return result.toString();
    }

    /**
     * Gets last <tt>cnt</tt> read bytes from the <tt>data</tt> buffer and puts into <tt>result</tt> buffer in special
     * format:
     * <ul>
     * <li>if byte represents char from partition 0x1F to 0x80 (which are normal ascii chars) then it's put into buffer as
     * it is</li>
     * <li>otherwise dot is put into buffer</li>
     * </ul>
     *
     * @param data
     * @param result
     * @param cnt
     */
    private static void toText(ByteBuffer data, StringBuilder result, int cnt) {
        int charPos = data.position() - cnt;
        for (int a = 0; a < cnt; a++) {
            int c = data.get(charPos++);
            if (c > 0x1f && c < 0x80)
                result.append((char) c);
            else
                result.append('.');
        }
    }
}

Related

1. bytesToHexString(ByteBuffer b)
2. toHex(ByteBuffer bb)
3. toHex(ByteBuffer bb)
4. toHex(ByteBuffer buf)
5. toHex(ByteBuffer buffer)
6. toHexStr(final ByteBuffer data)
7. toHexStream(ByteBuffer data)
8. toHexString(ByteBuffer bb)
9. toHexString(ByteBuffer bb)