Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/sun/cri/bytecode/Bytes.java @ 4149:cf4de9cc1268
Integrated latest mxtool updates.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 20 Dec 2011 10:36:44 +0100 |
parents | e233f5660da4 |
children |
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/* * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.cri.bytecode; /** * A collection of utility methods for dealing with bytes, particularly in byte arrays. */ public class Bytes { /** * Gets a signed 1-byte value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @return the signed 1-byte value at index {@code bci} in array {@code data} */ public static int beS1(byte[] data, int bci) { return data[bci]; } /** * Gets a signed 2-byte big-endian value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @return the signed 2-byte, big-endian, value at index {@code bci} in array {@code data} */ public static int beS2(byte[] data, int bci) { return (data[bci] << 8) | (data[bci + 1] & 0xff); } /** * Gets an unsigned 1-byte value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @return the unsigned 1-byte value at index {@code bci} in array {@code data} */ public static int beU1(byte[] data, int bci) { return data[bci] & 0xff; } /** * Gets an unsigned 2-byte big-endian value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @return the unsigned 2-byte, big-endian, value at index {@code bci} in array {@code data} */ public static int beU2(byte[] data, int bci) { return ((data[bci] & 0xff) << 8) | (data[bci + 1] & 0xff); } /** * Gets a signed 4-byte big-endian value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @return the signed 4-byte, big-endian, value at index {@code bci} in array {@code data} */ public static int beS4(byte[] data, int bci) { return (data[bci] << 24) | ((data[bci + 1] & 0xff) << 16) | ((data[bci + 2] & 0xff) << 8) | (data[bci + 3] & 0xff); } /** * Gets either a signed 2-byte or a signed 4-byte big-endian value. * @param data the array containing the data * @param bci the start index of the value to retrieve * @param fourByte if true, this method will return a 4-byte value * @return the signed 2 or 4-byte, big-endian, value at index {@code bci} in array {@code data} */ public static int beSVar(byte[] data, int bci, boolean fourByte) { if (fourByte) { return beS4(data, bci); } else { return beS2(data, bci); } } }