| /******************************************************************************* |
| * Copyright (c) 2000, 2017 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.core.internal.utils; |
| |
| import java.nio.charset.StandardCharsets; |
| |
| public class Convert { |
| |
| /** |
| * Converts the string argument to a byte array. |
| */ |
| public static String fromUTF8(byte[] b) { |
| return new String(b, StandardCharsets.UTF_8); |
| } |
| |
| /** |
| * Converts the string argument to a byte array. |
| */ |
| public static byte[] toUTF8(String s) { |
| return s.getBytes(StandardCharsets.UTF_8); |
| } |
| |
| /** |
| * Performs conversion of a long value to a byte array representation. |
| * |
| * @see #bytesToLong(byte[]) |
| */ |
| public static byte[] longToBytes(long value) { |
| |
| // A long value is 8 bytes in length. |
| byte[] bytes = new byte[8]; |
| |
| // Convert and copy value to byte array: |
| // -- Cast long to a byte to retrieve least significant byte; |
| // -- Left shift long value by 8 bits to isolate next byte to be converted; |
| // -- Repeat until all 8 bytes are converted (long = 64 bits). |
| // Note: In the byte array, the least significant byte of the long is held in |
| // the highest indexed array bucket. |
| |
| for (int i = 0; i < bytes.length; i++) { |
| bytes[(bytes.length - 1) - i] = (byte) value; |
| value >>>= 8; |
| } |
| |
| return bytes; |
| } |
| |
| /** |
| * Performs conversion of a byte array to a long representation. |
| * |
| * @see #longToBytes(long) |
| */ |
| public static long bytesToLong(byte[] value) { |
| |
| long longValue = 0L; |
| |
| // See method convertLongToBytes(long) for algorithm details. |
| for (int i = 0; i < value.length; i++) { |
| // Left shift has no effect thru first iteration of loop. |
| longValue <<= 8; |
| longValue ^= value[i] & 0xFF; |
| } |
| |
| return longValue; |
| } |
| } |