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package io.ipfs.multibase;
public class Base16 {
public static byte[] decode(String hex) {
if (hex.length() % 2 == 1)
throw new IllegalArgumentException(
"Must have an even number of hex digits to convert to bytes!");
byte[] res = new byte[hex.length() / 2];
for (int i = 0; i < res.length; i++)
res[i] = (byte) Integer.parseInt(hex.substring(2 * i, 2 * i + 2), 16);
return res;
}
public static String encode(byte[] data) {
return bytesToHex(data);
}
private static String[] HEX_DIGITS =
new String[] {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
private static String[] HEX = new String[256];
static {
for (int i = 0; i < 256; i++) HEX[i] = HEX_DIGITS[(i >> 4) & 0xF] + HEX_DIGITS[i & 0xF];
}
public static String byteToHex(byte b) {
return HEX[b & 0xFF];
}
public static String bytesToHex(byte[] data) {
StringBuilder s = new StringBuilder();
for (byte b : data) s.append(byteToHex(b));
return s.toString();
}
}
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