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class utilTest {
public static void main(String[] argv) throws Throwable {
byte[] b = new byte[] {
0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab,
(byte) 0xcd, (byte) 0xef
};
String s = "0123456789ABCDEF";
System.out.println(toString(b));
System.out.println(s);
System.out.println(toString(toBytesFromString(s)));
}
// The following comes from the GNU Crypto project gnu.crypto.util.Util
private static final char[] HEX_DIGITS = {
'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
};
public static byte[] toBytesFromString(String s) {
int limit = s.length();
byte[] result = new byte[((limit + 1) / 2)];
int i = 0, j = 0;
if ((limit % 2) == 1) {
result[j++] = (byte) fromDigit(s.charAt(i++));
}
while (i < limit) {
result[j++] =
(byte)((fromDigit(s.charAt(i++)) << 4) | fromDigit(s.charAt(i++)));
}
return result;
}
public static int fromDigit(char c) {
if (c >= '0' && c <= '9') {
return c - '0';
} else if (c >= 'A' && c <= 'F') {
return c - 'A' + 10;
} else if (c >= 'a' && c <= 'f') {
return c - 'a' + 10;
} else
throw new IllegalArgumentException("Invalid hexadecimal digit: " + c);
}
public static String toString(byte[] ba) {
return toString(ba, 0, ba.length);
}
public static final String toString(byte[] ba, int offset, int length) {
char[] buf = new char[length * 2];
for (int i = 0, j = 0, k; i < length; ) {
k = ba[offset + i++];
buf[j++] = HEX_DIGITS[(k >>> 4) & 0x0F];
buf[j++] = HEX_DIGITS[ k & 0x0F];
}
return new String(buf);
}
}
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