50 lines
1.3 KiB
Java
50 lines
1.3 KiB
Java
package samples;
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public class Utils {
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public static byte[] hexToBytes(String s) {
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int len = s.length();
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byte[] data = new byte[len / 2];
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for (int i = 0; i < len; i += 2) {
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data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) +
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Character.digit(s.charAt(i + 1), 16));
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}
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return data;
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}
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public static final int toInt(byte val[]) {
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int res = 0;
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for (int i = 0; i < val.length; i++) {
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int v = val[i] & 0xff;
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res = res + (v << (i * 8));
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}
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return res;
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}
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public static final long toLong(byte val[]) {
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long res = 0;
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for (int i = 0; i < val.length; i++) {
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long v = val[i] & 0xff;
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res = res + (v << (i * 8));
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}
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return res;
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}
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public static final byte[] toBytes(int val) {
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byte[] res = new byte[4];
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for (int i = 0; i < 4; i++) {
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res[i] = (byte) (val & 0xff);
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val >>>= 8;
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}
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return res;
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}
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public static final byte[] toBytes(long val) {
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byte[] res = new byte[8];
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for (int i = 0; i < 8; i++) {
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res[i] = (byte) (val & 0xff);
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val >>>= 8;
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}
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return res;
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}
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}
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