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annotate graal/com.oracle.max.base/src/com/sun/max/lang/Bytes.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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3733
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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
e233f5660da4 Added Java files from Maxine project.
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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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.lang;
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24
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25 import java.io.*;
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26
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27 import com.sun.max.io.*;
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28 import com.sun.max.util.*;
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29
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30 /**
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31 * Byte and byte array operations.
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32 */
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33 public final class Bytes {
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34
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35 private Bytes() {
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36 }
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37
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38 public static final int SIZE = 1;
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39 public static final int WIDTH = 8;
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40 public static final int MASK = 0xff;
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41
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42 public static final Range VALUE_RANGE = new Range(Byte.MIN_VALUE, Byte.MAX_VALUE);
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43
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44 public static int zeroExtendedToInt(byte b) {
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45 final char ch = (char) b;
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46 return ch;
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47 }
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48
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49 /**
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50 * Returns the number of zero bits following the lowest-order ("rightmost")
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51 * one-bit in the two's complement binary representation of the specified
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52 * {@code byte} value. Returns 8 if the specified value has no
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53 * one-bits in its two's complement representation, in other words if it is
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54 * equal to zero.
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55 *
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56 * @return the number of zero bits following the lowest-order ("rightmost")
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57 * one-bit in the two's complement binary representation of the
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58 * specified {@code byte} value, or 8 if the value is equal
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59 * to zero.
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60 */
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61 public static int numberOfTrailingZeros(byte b) {
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62 // HD, Figure 5-14
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63 int y;
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64 int i = b & 0xFF;
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65 if (i == 0) {
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66 return 8;
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67 }
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68 int n = 7;
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69 y = (i << 4) & 0xFF;
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70 if (y != 0) {
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71 n = n - 4;
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72 i = y;
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73 }
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74 y = (i << 2) & 0xFF;
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75 if (y != 0) {
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76 n = n - 2;
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77 i = y;
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78 }
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79 return n - (((i << 1) & 0xFF) >>> 7);
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80 }
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81
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82 /**
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83 * Are the bytes of an array, starting at some position, equal to the contents
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84 * of a second array.
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85 * @param array1 An array of bytes
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86 * @param startIndex1 Index in {@code array1} at which to start comparison
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87 * @param array2 An array of bytes to be compared
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88 * @return tree iff the entire contents of {@code array2} are equal to
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89 * the contents of {@code array1}, starting at {@code startIndex1}.
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90 */
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91 public static boolean equals(byte[] array1, int startIndex1, byte[] array2) {
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92 if (array1.length < startIndex1 + array2.length) {
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93 return false;
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94 }
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95 for (int i = 0; i < array2.length; i++) {
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96 if (array1[startIndex1 + i] != array2[i]) {
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97 return false;
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98 }
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99 }
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100 return true;
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101 }
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102
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103 /**
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104 * Compares the first {@code length} bytes in two byte arrays
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105 * for equality.
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106 */
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107 public static boolean equals(byte[] array1, byte[] array2, int length) {
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108 if (array1.length < length || array2.length < length) {
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109 return false;
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110 }
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111 for (int i = 0; i < length; i++) {
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112 if (array1[i] != array2[i]) {
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113 return false;
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114 }
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115 }
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116 return true;
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117 }
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118
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119 /**
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120 * Compares the contents of two byte arrays for equality.
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121 */
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122 public static boolean equals(byte[] array1, byte[] array2) {
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123 if (array1 == array2) {
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124 return true;
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125 }
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126 if (array1.length != array2.length) {
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127 return false;
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128 }
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129 return equals(array1, array2, array1.length);
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130 }
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131
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132 public static void copy(byte[] fromArray, int fromStartIndex, byte[] toArray,
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133 final int toStartIndex, int nBytes) {
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134 for (int i = 0; i < nBytes; i++) {
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135 toArray[toStartIndex + i] = fromArray[fromStartIndex + i];
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136 }
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137 }
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138
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139 public static void copy(byte[] fromArray, byte[] toArray, int nBytes) {
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140 copy(fromArray, 0, toArray, 0, nBytes);
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141 }
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142
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
143 public static void copyAll(byte[] fromArray, byte[] toArray, int toStartIndex) {
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parents:
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144 copy(fromArray, 0, toArray, toStartIndex, fromArray.length);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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145 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
146
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
147 public static void copyAll(byte[] fromArray, byte[] toArray) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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148 copy(fromArray, 0, toArray, 0, fromArray.length);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
149 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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150
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
151 public static byte[] withLength(byte[] array, int length) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
152 final byte[] result = new byte[length];
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
153 if (length >= array.length) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
154 copyAll(array, result);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
155 } else {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
156 copy(array, result, length);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
157 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
158 return result;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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159 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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160
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
161 public static byte[] getSection(byte[] fromArray, int startIndex, int endIndex) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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162 final int length = endIndex - startIndex;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
163 final byte[] result = new byte[length];
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
164 copy(fromArray, startIndex, result, 0, length);
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
165 return result;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
166 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
167
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
168 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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169 * Assigns zero to every byte in an array.
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
170 */
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
171 public static void clear(byte[] array) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
172 for (int i = 0; i < array.length; i++) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
173 array[i] = (byte) 0;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
174 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
175 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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176
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
177 public static boolean areClear(byte[] array) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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178 for (int i = 0; i < array.length; i++) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
179 if (array[i] != (byte) 0) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
180 return false;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
181 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
182 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
183 return true;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
184 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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185
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
186 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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187 * @param value a byte
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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188 * @return A string representation of the byte in hexadecimal, e.g. "0x0A"
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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189 */
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
190 public static String toHexLiteral(byte value) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
191 String hexString = Integer.toHexString(value).toUpperCase();
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
192 if (hexString.length() == 1) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
193 hexString = "0" + hexString;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
194 } else if (hexString.length() > 2) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
195 hexString = hexString.substring(hexString.length() - 2);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
196 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
197 return "0x" + hexString;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
198 }
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
199
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
200 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
201 * @param values an array of bytes
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
202 * @return A string representation of the bytes in hexadecimal, e.g. "0x01A203"
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
203 */
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
204 public static String toHexLiteral(byte[] values) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
205 String s = "0x";
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
206 for (byte value : values) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
207 String hexString = Integer.toHexString(value).toUpperCase();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
208 if (hexString.length() == 1) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
209 hexString = "0" + hexString;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
210 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
211 s += hexString;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
212 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
213 return s;
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
214 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
215
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
216 /**
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
217 * Returns a string representation of the contents of the specified array.
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
218 * Adjacent elements are separated by the specified separator. Elements are
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
219 * converted to strings with {@link #toHexLiteral(byte)}.
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
220 *
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
221 * @param array the array whose string representation to return
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
222 * @param separator the separator to use
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
223 * @return a string representation of <tt>array</tt>
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
224 * @throws NullPointerException if {@code array} or {@code separator} is null
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
225 */
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
226 public static String toHexString(byte[] array, String separator) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
227 if (array == null || separator == null) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
228 throw new NullPointerException();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
229 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
230 if (array.length == 0) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
231 return "";
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
232 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
233
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
234 final StringBuilder buf = new StringBuilder();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
235 buf.append(toHexLiteral(array[0]));
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
236
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
237 for (int i = 1; i < array.length; i++) {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
238 buf.append(separator);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
239 buf.append(toHexLiteral(array[i]));
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
240 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
241
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
242 return buf.toString();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
243 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
244
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
245 public static byte[] fromInputStream(InputStream inputStream) throws IOException {
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
246 final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
247 Streams.copy(inputStream, outputStream);
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
248 return outputStream.toByteArray();
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
249 }
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
250
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
251 }