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/*
* This file is part of the Javassist toolkit.
*
* 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. You may obtain a copy of the License at
* either http://www.mozilla.org/MPL/.
*
* 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.
*
* The Original Code is Javassist.
*
* The Initial Developer of the Original Code is Shigeru Chiba. Portions
* created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
* All Rights Reserved.
*
* Contributor(s):
*
* The development of this software is supported in part by the PRESTO
* program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
*/
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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