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Copy pathBytes.java
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78 lines (73 loc) · 3.06 KB
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/*
* Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.
*
* Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation, these intellectual property
* rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
* more additional patents or pending patent applications in the U.S. and in other countries.
*
* U.S. Government Rights - Commercial software. Government users are subject to the Sun
* Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
* supplements.
*
* Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
* registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
* are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
* U.S. and other countries.
*
* UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
* Company, Ltd.
*/
package com.sun.cri.bytecode;
/**
* A collection of utility methods for dealing with bytes, particularly in byte arrays.
*
* @author Ben L. Titzer
*/
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);
}
}