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/*
* Copyright (C) 2020, Michael Dardis. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.util;
import java.text.MessageFormat;
import org.eclipse.jgit.internal.JGitText;
/**
* Encodes and decodes to and from hexadecimal notation.
*
* @since 5.7
*/
public final class Hex {
private static final char[] HEX = "0123456789abcdef".toCharArray(); //$NON-NLS-1$
/** Defeats instantiation. */
private Hex() {
// empty
}
/**
* Decode a hexadecimal string to a byte array.
*
* Note this method validates that characters in the given string are valid
* as digits in a hex string.
*
* @param s
* hexadecimal string
* @return decoded array
*/
public static byte[] decode(String s) {
int len = s.length();
byte[] b = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
int left = Character.digit(s.charAt(i), 16);
int right = Character.digit(s.charAt(i + 1), 16);
if (left == -1 || right == -1) {
throw new IllegalArgumentException(MessageFormat.format(
JGitText.get().invalidHexString,
s));
}
b[i / 2] = (byte) (left << 4 | right);
}
return b;
}
/**
* Encode a byte array to a hexadecimal string.
*
* @param b byte array
* @return hexadecimal string
*/
public static String toHexString(byte[] b) {
char[] c = new char[b.length * 2];
for (int i = 0; i < b.length; i++) {
int v = b[i] & 0xFF;
c[i * 2] = HEX[v >>> 4];
c[i * 2 + 1] = HEX[v & 0x0F];
}
return new String(c);
}
}
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