Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/lang/Bytes.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
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rev | line source |
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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 |
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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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143 public static void copyAll(byte[] fromArray, byte[] toArray, int toStartIndex) { |
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144 copy(fromArray, 0, toArray, toStartIndex, fromArray.length); |
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145 } |
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146 |
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147 public static void copyAll(byte[] fromArray, byte[] toArray) { |
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148 copy(fromArray, 0, toArray, 0, fromArray.length); |
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149 } |
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150 |
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151 public static byte[] withLength(byte[] array, int length) { |
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152 final byte[] result = new byte[length]; |
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153 if (length >= array.length) { |
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154 copyAll(array, result); |
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155 } else { |
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156 copy(array, result, length); |
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157 } |
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158 return result; |
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159 } |
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160 |
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161 public static byte[] getSection(byte[] fromArray, int startIndex, int endIndex) { |
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162 final int length = endIndex - startIndex; |
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163 final byte[] result = new byte[length]; |
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164 copy(fromArray, startIndex, result, 0, length); |
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165 return result; |
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166 } |
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167 |
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168 /** |
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169 * Assigns zero to every byte in an array. |
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170 */ |
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171 public static void clear(byte[] array) { |
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172 for (int i = 0; i < array.length; i++) { |
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173 array[i] = (byte) 0; |
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174 } |
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|
175 } |
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176 |
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|
177 public static boolean areClear(byte[] array) { |
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178 for (int i = 0; i < array.length; i++) { |
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179 if (array[i] != (byte) 0) { |
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180 return false; |
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181 } |
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|
182 } |
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183 return true; |
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184 } |
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185 |
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|
186 /** |
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187 * @param value a byte |
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188 * @return A string representation of the byte in hexadecimal, e.g. "0x0A" |
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|
189 */ |
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|
190 public static String toHexLiteral(byte value) { |
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191 String hexString = Integer.toHexString(value).toUpperCase(); |
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|
192 if (hexString.length() == 1) { |
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|
193 hexString = "0" + hexString; |
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|
194 } else if (hexString.length() > 2) { |
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|
195 hexString = hexString.substring(hexString.length() - 2); |
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|
196 } |
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|
197 return "0x" + hexString; |
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|
198 } |
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|
199 |
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diff
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|
200 /** |
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|
201 * @param values an array of bytes |
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|
202 * @return A string representation of the bytes in hexadecimal, e.g. "0x01A203" |
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|
203 */ |
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|
204 public static String toHexLiteral(byte[] values) { |
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|
205 String s = "0x"; |
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|
206 for (byte value : values) { |
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|
207 String hexString = Integer.toHexString(value).toUpperCase(); |
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|
208 if (hexString.length() == 1) { |
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|
209 hexString = "0" + hexString; |
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|
210 } |
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|
211 s += hexString; |
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parents:
diff
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|
212 } |
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parents:
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|
213 return s; |
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parents:
diff
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|
214 } |
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|
215 |
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diff
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|
216 /** |
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|
217 * Returns a string representation of the contents of the specified array. |
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|
218 * Adjacent elements are separated by the specified separator. Elements are |
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|
219 * converted to strings with {@link #toHexLiteral(byte)}. |
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|
220 * |
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|
221 * @param array the array whose string representation to return |
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|
222 * @param separator the separator to use |
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|
223 * @return a string representation of <tt>array</tt> |
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|
224 * @throws NullPointerException if {@code array} or {@code separator} is null |
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|
225 */ |
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|
226 public static String toHexString(byte[] array, String separator) { |
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|
227 if (array == null || separator == null) { |
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|
228 throw new NullPointerException(); |
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diff
changeset
|
229 } |
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|
230 if (array.length == 0) { |
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|
231 return ""; |
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parents:
diff
changeset
|
232 } |
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parents:
diff
changeset
|
233 |
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diff
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|
234 final StringBuilder buf = new StringBuilder(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
235 buf.append(toHexLiteral(array[0])); |
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|
236 |
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diff
changeset
|
237 for (int i = 1; i < array.length; i++) { |
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|
238 buf.append(separator); |
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parents:
diff
changeset
|
239 buf.append(toHexLiteral(array[i])); |
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|
240 } |
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|
241 |
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|
242 return buf.toString(); |
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parents:
diff
changeset
|
243 } |
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|
244 |
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|
245 public static byte[] fromInputStream(InputStream inputStream) throws IOException { |
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|
246 final ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
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|
247 Streams.copy(inputStream, outputStream); |
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|
248 return outputStream.toByteArray(); |
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|
249 } |
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parents:
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|
250 |
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|
251 } |