jgit/org.eclipse.jgit.storage.dht/src/org/eclipse/jgit/storage/dht/KeyUtils.java

/*
 * Copyright (C) 2011, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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package org.eclipse.jgit.storage.dht;

import org.eclipse.jgit.util.RawParseUtils;

final class KeyUtils {
	static short parse16(byte[] src, int pos) {
		return (short) RawParseUtils.parseHexInt16(src, pos);
	}

	static int parse32(byte[] src, int pos) {
		return RawParseUtils.parseHexInt32(src, pos);
	}

	static void format16(byte[] dst, int p, short w) {
		int o = p + 3;
		while (o >= p && w != 0) {
			dst[o--] = hexbyte[w & 0xf];
			w >>>= 4;
		}
		while (o >= p)
			dst[o--] = '0';
	}

	static void format32(byte[] dst, int p, int w) {
		int o = p + 7;
		while (o >= p && w != 0) {
			dst[o--] = hexbyte[w & 0xf];
			w >>>= 4;
		}
		while (o >= p)
			dst[o--] = '0';
	}

	private static final byte[] hexbyte = { '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

	private KeyUtils() {
		// Do not create instances of this class.
	}
}