Util.java

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package com.rocon.nfc;

public class Util {

        // Hex help
                private static final byte[] HEX_CHAR_TABLE = { (byte) '0', (byte) '1',
                                (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6',
                                (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B',
                                (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F' };
                                
                public Util() {
                        // TODO Auto-generated constructor stub
                }
                
                public static String getHexString(byte[] raw, int len) {
                        byte[] hex = new byte[3 * len];
                        int index = 0;
                        int pos = 0;

                        for (byte b : raw) {
                                if (pos >= len)
                                        break;

                                pos++;
                                int v = b & 0xFF;
                                hex[index++] = HEX_CHAR_TABLE[v >>> 4];
                                hex[index++] = HEX_CHAR_TABLE[v & 0xF];
                                hex[index++] = ' ';
                        }

                        return new String(hex);
                }
                
                public static byte[] concat(byte[]... arrays) {
                int length = 0;
                for (byte[] array : arrays) {
                        length += array.length;
                }
                
                byte[] result = new byte[length];
                int pos = 0;
                for (byte[] array : arrays) {
                        System.arraycopy(array, 0, result, pos, array.length);
                        pos += array.length;
                }
                
                return result;
            }
                
}