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comparison graal/com.oracle.max.base/src/com/sun/max/lang/Endianness.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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children bc8527f3071c
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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.sun.max.lang;
24
25 import java.io.*;
26 import java.nio.*;
27
28 /**
29 * Enumerated type with values for the most common more ways to arrange bits, bytes, etc.
30 */
31 public enum Endianness {
32
33 LITTLE {
34 @Override
35 public short readShort(InputStream stream) throws IOException {
36 final int low = readByte(stream) & 0xff;
37 final int high = readByte(stream);
38 return (short) ((high << 8) | low);
39 }
40
41 @Override
42 public int readInt(InputStream stream) throws IOException {
43 final int low = readShort(stream) & 0xffff;
44 final int high = readShort(stream);
45 return (high << 16) | low;
46 }
47
48 @Override
49 public long readLong(InputStream stream) throws IOException {
50 final long low = readInt(stream) & 0xffffffffL;
51 final long high = readInt(stream);
52 return (high << 32) | low;
53 }
54
55 @Override
56 public void writeShort(OutputStream stream, short value) throws IOException {
57 short v = value;
58 stream.write(v & 0xff);
59 v >>= 8;
60 stream.write(v & 0xff);
61 }
62
63 @Override
64 public void writeInt(OutputStream stream, int value) throws IOException {
65 int v = value;
66 stream.write(v & 0xff);
67 v >>= 8;
68 stream.write(v & 0xff);
69 v >>= 8;
70 stream.write(v & 0xff);
71 v >>= 8;
72 stream.write(v & 0xff);
73 }
74
75 @Override
76 public void writeLong(OutputStream stream, long value) throws IOException {
77 long v = value;
78 stream.write((int) v & 0xff);
79 v >>= 8;
80 stream.write((int) v & 0xff);
81 v >>= 8;
82 stream.write((int) v & 0xff);
83 v >>= 8;
84 stream.write((int) v & 0xff);
85 v >>= 8;
86 stream.write((int) v & 0xff);
87 v >>= 8;
88 stream.write((int) v & 0xff);
89 v >>= 8;
90 stream.write((int) v & 0xff);
91 v >>= 8;
92 stream.write((int) v & 0xff);
93 }
94
95 @Override
96 public byte[] toBytes(short value) {
97 short v = value;
98 final byte[] bytes = new byte[2];
99 bytes[0] = (byte) (v & 0xff);
100 v >>= 8;
101 bytes[1] = (byte) (v & 0xff);
102 return bytes;
103 }
104
105 @Override
106 public byte[] toBytes(int value) {
107 int v = value;
108 final byte[] bytes = new byte[4];
109 bytes[0] = (byte) (v & 0xff);
110 v >>= 8;
111 bytes[1] = (byte) (v & 0xff);
112 v >>= 8;
113 bytes[2] = (byte) (v & 0xff);
114 v >>= 8;
115 bytes[3] = (byte) (v & 0xff);
116 return bytes;
117 }
118
119 @Override
120 public byte[] toBytes(long value) {
121 long v = value;
122 final byte[] bytes = new byte[8];
123 bytes[0] = (byte) (v & 0xff);
124 v >>= 8;
125 bytes[1] = (byte) (v & 0xff);
126 v >>= 8;
127 bytes[2] = (byte) (v & 0xff);
128 v >>= 8;
129 bytes[3] = (byte) (v & 0xff);
130 v >>= 8;
131 bytes[4] = (byte) (v & 0xff);
132 v >>= 8;
133 bytes[5] = (byte) (v & 0xff);
134 v >>= 8;
135 bytes[6] = (byte) (v & 0xff);
136 v >>= 8;
137 bytes[7] = (byte) (v & 0xff);
138 return bytes;
139 }
140
141 @Override
142 public void toBytes(short value, byte[] result, int offset) {
143 short v = value;
144 for (int i = 0; i < Shorts.SIZE && i < result.length; i++) {
145 result[i + offset] = (byte) (v & 0xff);
146 v >>= 8;
147 }
148 }
149
150 @Override
151 public void toBytes(int value, byte[] result, int offset) {
152 int v = value;
153 for (int i = 0; i < Ints.SIZE && i < result.length; i++) {
154 result[i + offset] = (byte) (v & 0xff);
155 v >>= 8;
156 }
157 }
158
159 @Override
160 public void toBytes(long value, byte[] result, int offset) {
161 long v = value;
162 for (int i = 0; i < Longs.SIZE && i < result.length; i++) {
163 result[i + offset] = (byte) (v & 0xff);
164 v >>= 8;
165 }
166 }
167
168 @Override
169 public int offsetWithinWord(WordWidth wordWidth, WordWidth dataWidth) {
170 return 0;
171 }
172
173 @Override
174 public ByteOrder asByteOrder() {
175 return ByteOrder.LITTLE_ENDIAN;
176 }
177 },
178 BIG {
179 @Override
180 public short readShort(InputStream stream) throws IOException {
181 final int high = readByte(stream);
182 final int low = readByte(stream) & 0xff;
183 return (short) ((high << 8) | low);
184 }
185
186 @Override
187 public int readInt(InputStream stream) throws IOException {
188 final int high = readShort(stream);
189 final int low = readShort(stream) & 0xffff;
190 return (high << 16) | low;
191 }
192
193 @Override
194 public long readLong(InputStream stream) throws IOException {
195 final long high = readInt(stream);
196 final long low = readInt(stream) & 0xffffffffL;
197 return (high << 32) | low;
198 }
199
200 @Override
201 public void writeShort(OutputStream stream, short value) throws IOException {
202 stream.write((value >> 8) & 0xff);
203 stream.write(value & 0xff);
204 }
205
206 @Override
207 public void writeInt(OutputStream stream, int value) throws IOException {
208 stream.write((value >> 24) & 0xff);
209 stream.write((value >> 16) & 0xff);
210 stream.write((value >> 8) & 0xff);
211 stream.write(value & 0xff);
212 }
213
214 @Override
215 public void writeLong(OutputStream stream, long value) throws IOException {
216 stream.write((int) (value >> 56) & 0xff);
217 stream.write((int) (value >> 48) & 0xff);
218 stream.write((int) (value >> 40) & 0xff);
219 stream.write((int) (value >> 32) & 0xff);
220 stream.write((int) (value >> 24) & 0xff);
221 stream.write((int) (value >> 16) & 0xff);
222 stream.write((int) (value >> 8) & 0xff);
223 stream.write((int) value & 0xff);
224 }
225
226 @Override
227 public byte[] toBytes(short value) {
228 short v = value;
229 final byte[] bytes = new byte[2];
230 bytes[1] = (byte) (v & 0xff);
231 v >>= 8;
232 bytes[0] = (byte) (v & 0xff);
233 return bytes;
234 }
235
236 @Override
237 public byte[] toBytes(int value) {
238 int v = value;
239 final byte[] bytes = new byte[4];
240 bytes[3] = (byte) (v & 0xff);
241 v >>= 8;
242 bytes[2] = (byte) (v & 0xff);
243 v >>= 8;
244 bytes[1] = (byte) (v & 0xff);
245 v >>= 8;
246 bytes[0] = (byte) (v & 0xff);
247 return bytes;
248 }
249
250 @Override
251 public byte[] toBytes(long value) {
252 long v = value;
253 final byte[] bytes = new byte[8];
254 bytes[7] = (byte) (v & 0xff);
255 v >>= 8;
256 bytes[6] = (byte) (v & 0xff);
257 v >>= 8;
258 bytes[5] = (byte) (v & 0xff);
259 v >>= 8;
260 bytes[4] = (byte) (v & 0xff);
261 v >>= 8;
262 bytes[3] = (byte) (v & 0xff);
263 v >>= 8;
264 bytes[2] = (byte) (v & 0xff);
265 v >>= 8;
266 bytes[1] = (byte) (v & 0xff);
267 v >>= 8;
268 bytes[0] = (byte) (v & 0xff);
269 return bytes;
270 }
271
272 @Override
273 public void toBytes(short value, byte[] result, int offset) {
274 short v = value;
275 int toIndex = offset + Shorts.SIZE - 1;
276 for (int i = 1; i <= Shorts.SIZE && i <= result.length; i++) {
277 result[toIndex--] = (byte) (v & 0xff);
278 v >>= 8;
279 }
280 }
281
282 @Override
283 public void toBytes(int value, byte[] result, int offset) {
284 int v = value;
285 int toIndex = offset + Ints.SIZE - 1;
286 for (int i = 1; i <= Ints.SIZE && i <= result.length; i++) {
287 result[toIndex--] = (byte) (v & 0xff);
288 v >>= 8;
289 }
290 }
291
292 @Override
293 public void toBytes(long value, byte[] result, int offset) {
294 long v = value;
295 int toIndex = offset + Longs.SIZE - 1;
296 for (int i = 1; i <= Longs.SIZE && i <= result.length; i++) {
297 result[toIndex--] = (byte) (v & 0xff);
298 v >>= 8;
299 }
300 }
301
302 @Override
303 public int offsetWithinWord(WordWidth wordWidth, WordWidth dataWidth) {
304 assert wordWidth.numberOfBytes >= dataWidth.numberOfBytes;
305 return wordWidth.numberOfBytes - dataWidth.numberOfBytes;
306 }
307
308 @Override
309 public ByteOrder asByteOrder() {
310 return ByteOrder.BIG_ENDIAN;
311 }
312 };
313
314 @Override
315 public String toString() {
316 return name().toLowerCase();
317 }
318
319 public byte readByte(InputStream stream) throws IOException {
320 final int result = stream.read();
321 if (result < 0) {
322 throw new IOException();
323 }
324 return (byte) result;
325 }
326
327 public abstract short readShort(InputStream stream) throws IOException;
328
329 public abstract int readInt(InputStream stream) throws IOException;
330
331 public abstract long readLong(InputStream stream) throws IOException;
332
333 public abstract void writeShort(OutputStream stream, short value) throws IOException;
334
335 public abstract void writeInt(OutputStream stream, int value) throws IOException;
336
337 public abstract void writeLong(OutputStream stream, long value) throws IOException;
338
339 public byte[] toBytes(byte value) {
340 final byte[] bytes = new byte[1];
341 bytes[0] = value;
342 return bytes;
343 }
344
345 public abstract byte[] toBytes(short value);
346
347 public abstract byte[] toBytes(int value);
348
349 public abstract byte[] toBytes(long value);
350
351 public void toBytes(byte value, byte[] result, int offset) {
352 if (result.length > 0) {
353 result[0] = value;
354 }
355 }
356
357 public abstract void toBytes(short value, byte[] result, int offset);
358
359 public abstract void toBytes(int value, byte[] result, int offset);
360
361 public abstract void toBytes(long value, byte[] result, int offset);
362
363 public abstract int offsetWithinWord(WordWidth wordWith, WordWidth dataWidth);
364
365 public abstract ByteOrder asByteOrder();
366 }