001: /*--
002:
003: Copyright (C) 2000-2003 Anthony Eden.
004: All rights reserved.
005:
006: Redistribution and use in source and binary forms, with or without
007: modification, are permitted provided that the following conditions
008: are met:
009:
010: 1. Redistributions of source code must retain the above copyright
011: notice, this list of conditions, and the following disclaimer.
012:
013: 2. Redistributions in binary form must reproduce the above copyright
014: notice, this list of conditions, and the disclaimer that follows
015: these conditions in the documentation and/or other materials
016: provided with the distribution.
017:
018: 3. The name "EdenLib" must not be used to endorse or promote products
019: derived from this software without prior written permission. For
020: written permission, please contact me@anthonyeden.com.
021:
022: 4. Products derived from this software may not be called "EdenLib", nor
023: may "EdenLib" appear in their name, without prior written permission
024: from Anthony Eden (me@anthonyeden.com).
025:
026: In addition, I request (but do not require) that you include in the
027: end-user documentation provided with the redistribution and/or in the
028: software itself an acknowledgement equivalent to the following:
029: "This product includes software developed by
030: Anthony Eden (http://www.anthonyeden.com/)."
031:
032: THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033: WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035: DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
036: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
037: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
038: SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
039: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
040: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
041: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
042: POSSIBILITY OF SUCH DAMAGE.
043:
044: For more information on EdenLib, please see <http://edenlib.sf.net/>.
045:
046: */
047:
048: package com.anthonyeden.lib.util;
049:
050: /** Utility class for working with bytes and byte arrays.
051:
052: @author Anthony Eden
053: */
054:
055: public class ByteUtilities {
056:
057: private ByteUtilities() {
058: // no op
059: }
060:
061: /** Convert the specified int to a 4 byte array.
062:
063: @param value The value
064: @return The byte array
065: */
066:
067: public static byte[] intToByteArray(int value) {
068: byte[] b = new byte[4];
069: for (int i = 0; i < 4; i++) {
070: int offset = (b.length - 1 - i) * 8;
071: b[i] = (byte) ((value >>> offset) & 0xFF);
072: }
073: return b;
074: }
075:
076: /** Convert the byte array to an int.
077:
078: @param b The byte array
079: @return The integer
080: */
081:
082: public static int byteArrayToInt(byte[] b) {
083: return byteArrayToInt(b, 0);
084: }
085:
086: /** Convert the byte array to an int starting from the given offset.
087:
088: @param b The byte array
089: @param offset The array offset
090: @return The integer
091: */
092:
093: public static int byteArrayToInt(byte[] b, int offset) {
094: int value = 0;
095: for (int i = 0; i < 4; i++) {
096: int shift = (4 - 1 - i) * 8;
097: value += (b[i + offset] & 0x000000FF) << shift;
098: }
099: return value;
100: }
101:
102: }
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