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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.runtime;
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26
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27 import sun.jvm.hotspot.debugger.*;
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28
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29 /** Encapsulates some byte-swapping operations defined in the VM */
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30
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31 public class Bytes {
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32 private boolean swap;
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33
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34 public Bytes(MachineDescription machDesc) {
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35 swap = !machDesc.isBigEndian();
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36 }
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37
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38 /** Should only swap if the hardware's underlying byte order is
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39 different from Java's */
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40 public short swapShort(short x) {
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41 if (!swap)
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42 return x;
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43
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44 return (short) (((x >> 8) & 0xFF) | (x << 8));
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45 }
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46
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47 /** Should only swap if the hardware's underlying byte order is
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48 different from Java's */
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49 public int swapInt(int x) {
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50 if (!swap)
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51 return x;
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52
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53 return (swapShort((short) x) << 16) | (swapShort((short) (x >> 16)) & 0xFFFF);
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54 }
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55
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56 /** Should only swap if the hardware's underlying byte order is
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57 different from Java's */
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58 public long swapLong(long x) {
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59 if (!swap)
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60 return x;
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61
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62 return (swapInt((int) x) << 32) | (swapInt((int) (x >> 32)) & 0xFFFFFFFF);
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63 }
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64 }
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