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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.argon2;

public class Util {

	public static String bytesToHexString(byte[] bytes) {
		StringBuilder sb = new StringBuilder();
		for (byte b : bytes) {
			sb.append(String.format("%02x", b & 0xff));
		}
		return sb.toString();
	}

	public static byte[] hexStringToByteArray(String s) {
		int len = s.length();
		byte[] data = new byte[len / 2];
		for (int i = 0; i < len; i += 2) {
			data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
		}
		return data;
	}

	public static long littleEndianBytesToLong(byte[] b) {
		long result = 0;
		for (int i = 7; i >= 0; i--) {
			result <<= 8;
			result |= (b[i] & 0xFF);
		}
		return result;
	}

	public static byte[] intToLittleEndianBytes(int a) {
		byte[] result = new byte[4];
		result[0] = (byte) (a & 0xFF);
		result[1] = (byte) ((a >> 8) & 0xFF);
		result[2] = (byte) ((a >> 16) & 0xFF);
		result[3] = (byte) ((a >> 24) & 0xFF);
		return result;
	}

	public static byte[] longToLittleEndianBytes(long a) {
		byte[] result = new byte[8];
		result[0] = (byte) (a & 0xFF);
		result[1] = (byte) ((a >> 8) & 0xFF);
		result[2] = (byte) ((a >> 16) & 0xFF);
		result[3] = (byte) ((a >> 24) & 0xFF);
		result[4] = (byte) ((a >> 32) & 0xFF);
		result[5] = (byte) ((a >> 40) & 0xFF);
		result[6] = (byte) ((a >> 48) & 0xFF);
		result[7] = (byte) ((a >> 56) & 0xFF);
		return result;
	}

	public static long intToLong(int x) {
		byte[] intBytes = intToLittleEndianBytes(x);
		byte[] bytes = new byte[8];
		System.arraycopy(intBytes, 0, bytes, 0, 4);
		return littleEndianBytesToLong(bytes);
	}

}