- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist.bytecode;
-
- /**
- * A collection of static methods for reading and writing a byte array.
- */
- public class ByteArray {
- /**
- * Reads an unsigned 16bit integer at the index.
- */
- public static int readU16bit(byte[] code, int index) {
- return ((code[index] & 0xff) << 8) | (code[index + 1] & 0xff);
- }
-
- /**
- * Reads a signed 16bit integer at the index.
- */
- public static int readS16bit(byte[] code, int index) {
- return (code[index] << 8) | (code[index + 1] & 0xff);
- }
-
- /**
- * Writes a 16bit integer at the index.
- */
- public static void write16bit(int value, byte[] code, int index) {
- code[index] = (byte)(value >>> 8);
- code[index + 1] = (byte)value;
- }
-
- /**
- * Reads a 32bit integer at the index.
- */
- public static int read32bit(byte[] code, int index) {
- return (code[index] << 24) | ((code[index + 1] & 0xff) << 16)
- | ((code[index + 2] & 0xff) << 8) | (code[index + 3] & 0xff);
- }
-
- /**
- * Writes a 32bit integer at the index.
- */
- public static void write32bit(int value, byte[] code, int index) {
- code[index] = (byte)(value >>> 24);
- code[index + 1] = (byte)(value >>> 16);
- code[index + 2] = (byte)(value >>> 8);
- code[index + 3] = (byte)value;
- }
-
- /**
- * Copies a 32bit integer.
- *
- * @param src the source byte array.
- * @param isrc the index into the source byte array.
- * @param dest the destination byte array.
- * @param idest the index into the destination byte array.
- */
- static void copy32bit(byte[] src, int isrc, byte[] dest, int idest) {
- dest[idest] = src[isrc];
- dest[idest + 1] = src[isrc + 1];
- dest[idest + 2] = src[isrc + 2];
- dest[idest + 3] = src[isrc + 3];
- }
- }
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