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1 /*
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2 * Copyright 2001-2002 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.debugger;
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26
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27 /** Common routines for data conversion */
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28
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29 public class DebuggerUtilities {
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30 protected long addressSize;
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31 protected boolean isBigEndian;
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32
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33 public DebuggerUtilities(long addressSize, boolean isBigEndian) {
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34 this.addressSize = addressSize;
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35 this.isBigEndian = isBigEndian;
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36 }
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37
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38 public String addressValueToString(long address) {
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39 StringBuffer buf = new StringBuffer();
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40 buf.append("0x");
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41 String val;
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42 // Make negative addresses have the correct size
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43 if (addressSize == 8) {
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44 val = Long.toHexString(address);
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45 } else {
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46 val = Integer.toHexString((int) address);
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47 }
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48 for (int i = 0; i < ((2 * addressSize) - val.length()); i++) {
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49 buf.append('0');
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50 }
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51 buf.append(val);
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52 return buf.toString();
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53 }
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54
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55 public void checkAlignment(long address, long alignment) {
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56 if (address % alignment != 0) {
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57 throw new UnalignedAddressException("Trying to read at address: " +
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58 addressValueToString(address) +
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59 " with alignment: " + alignment,
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60 address);
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61 }
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62 }
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63
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64 public long scanAddress(String addrStr) throws NumberFormatException {
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65 String s = addrStr.trim();
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66 if (!s.startsWith("0x")) {
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67 throw new NumberFormatException(addrStr);
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68 }
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69 long l = 0;
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70 for (int i = 2; i < s.length(); ++i) {
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71 int val = charToNibble(s.charAt(i));
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72 l <<= 4;
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73 l |= val;
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74 }
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75 return l;
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76 }
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77
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78 public int charToNibble(char ascii) throws NumberFormatException {
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79 if (ascii >= '0' && ascii <= '9') {
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80 return ascii - '0';
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81 } else if (ascii >= 'A' && ascii <= 'F') {
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82 return 10 + ascii - 'A';
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83 } else if (ascii >= 'a' && ascii <= 'f') {
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84 return 10 + ascii - 'a';
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85 }
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86 throw new NumberFormatException(new Character(ascii).toString());
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87 }
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88
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89 public boolean dataToJBoolean(byte[] data, long jbooleanSize) {
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90 checkDataContents(data, jbooleanSize);
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91
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92 return (data[0] != 0);
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93 }
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94
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95 public byte dataToJByte(byte[] data, long jbyteSize) {
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96 checkDataContents(data, jbyteSize);
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97
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98 return data[0];
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99 }
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100
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101 public char dataToJChar(byte[] data, long jcharSize) {
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102 checkDataContents(data, jcharSize);
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103
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104 if (!isBigEndian) {
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105 byteSwap(data);
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106 }
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107
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108 return (char) (((data[0] & 0xFF) << 8) | (data[1] & 0xFF));
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109 }
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110
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111 public double dataToJDouble(byte[] data, long jdoubleSize) {
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112 long longBits = dataToJLong(data, jdoubleSize);
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113
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114 return Double.longBitsToDouble(longBits);
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115 }
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116
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117 public float dataToJFloat(byte[] data, long jfloatSize) {
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118 int intBits = dataToJInt(data, jfloatSize);
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119
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120 return Float.intBitsToFloat(intBits);
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121 }
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122
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123 public int dataToJInt(byte[] data, long jintSize) {
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124 checkDataContents(data, jintSize);
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125
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126 if (!isBigEndian) {
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127 byteSwap(data);
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128 }
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129
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130 return (((data[0] & 0xFF) << 24) | ((data[1] & 0xFF) << 16) | ((data[2] & 0xFF) << 8) | (data[3] & 0xFF));
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131 }
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132
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133 public long dataToJLong(byte[] data, long jlongSize) {
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134 checkDataContents(data, jlongSize);
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135
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136 if (!isBigEndian) {
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137 byteSwap(data);
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138 }
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139
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140 return rawDataToJLong(data);
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141 }
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142
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143 public short dataToJShort(byte[] data, long jshortSize) {
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144 checkDataContents(data, jshortSize);
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145
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146 if (!isBigEndian) {
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147 byteSwap(data);
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148 }
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149
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150 return (short) (((data[0] & 0xFF) << 8) | (data[1] & 0xFF));
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151 }
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152
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153 public long dataToCInteger(byte[] data, boolean isUnsigned) {
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154 checkDataContents(data, data.length);
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155
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156 if (!isBigEndian) {
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157 byteSwap(data);
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158 }
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159
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160 // By default we'll be zero-extending.
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161 // Therefore we need to check to see whether isUnsigned is false and
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162 // also the high bit of the data is set.
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163 if ((data.length < 8) &&
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164 (isUnsigned == false) &&
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165 ((data[0] & 0x80) != 0)) {
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166 // Must sign-extend and right-align the data
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167 byte[] newData = new byte[8];
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168 for (int i = 0; i < 8; ++i) {
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169 if ((7 - i) < data.length) {
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170 newData[i] = data[i + data.length - 8];
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171 } else {
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172 newData[i] = (byte) 0xFF;
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173 }
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174 }
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175 data = newData;
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176 }
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177
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178 // Now just do the usual loop
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179 return rawDataToJLong(data);
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180 }
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181
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182 public long dataToAddressValue(byte[] data) {
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183 checkDataContents(data, addressSize);
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184
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185 if (!isBigEndian) {
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186 byteSwap(data);
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187 }
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188
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189 return rawDataToJLong(data);
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190 }
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191
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192 public byte[] jbooleanToData(boolean value) {
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193 byte[] res = new byte[1];
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194 res[0] = (byte) (value ? 1 : 0);
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195 return res;
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196 }
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197
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198 public byte[] jbyteToData(byte value) {
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199 byte[] res = new byte[1];
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200 res[0] = value;
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201 return res;
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202 }
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203
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204 public byte[] jcharToData(char value) {
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205 byte[] res = new byte[2];
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206 res[0] = (byte) ((value >> 8) & 0xFF);
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207 res[1] = (byte) value;
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208 if (!isBigEndian) {
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209 byteSwap(res);
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210 }
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211 return res;
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212 }
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213
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214 public byte[] jdoubleToData(double value) {
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215 return jlongToData(Double.doubleToLongBits(value));
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216 }
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217
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218 public byte[] jfloatToData(float value) {
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219 return jintToData(Float.floatToIntBits(value));
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220 }
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221
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222 public byte[] jintToData(int value) {
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223 byte[] res = new byte[4];
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224 for (int i = 0; i < 4; i++) {
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225 res[3 - i] = (byte) (value & 0xFF);
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226 value >>>= 8;
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227 }
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228 if (!isBigEndian) {
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229 byteSwap(res);
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230 }
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231 return res;
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232 }
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233
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234 public byte[] jlongToData(long value) {
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235 byte[] res = new byte[8];
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236 for (int i = 0; i < 8; i++) {
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237 res[7 - i] = (byte) (value & 0xFF);
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238 value >>>= 8;
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239 }
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240 if (!isBigEndian) {
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241 byteSwap(res);
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242 }
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243 return res;
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244 }
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245
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246 public byte[] jshortToData(short value) {
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247 byte[] res = new byte[2];
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248 res[0] = (byte) ((value >> 8) & 0xFF);
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249 res[1] = (byte) value;
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250 if (!isBigEndian) {
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251 byteSwap(res);
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252 }
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253 return res;
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254 }
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255
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256 public byte[] cIntegerToData(long longNumBytes, long value) {
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257 int numBytes = (int) longNumBytes;
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258 byte[] res = new byte[numBytes];
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259 for (int i = 0; i < numBytes; i++) {
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260 res[numBytes - i - 1] = (byte) (value & 0xFF);
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261 value >>>= 8;
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262 }
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263 if (!isBigEndian) {
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264 byteSwap(res);
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265 }
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266 return res;
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267 }
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268
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269 //--------------------------------------------------------------------------------
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270 // Internals only below this point
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271 //
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272
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273 private void checkDataContents(byte[] data, long len) {
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274 if (data.length != (int) len) {
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275 throw new InternalError("Bug in Win32Debugger");
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276 }
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277 }
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278
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279 private void byteSwap(byte[] data) {
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280 for (int i = 0; i < (data.length / 2); ++i) {
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281 int altIndex = data.length - i - 1;
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282 byte t = data[altIndex];
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283 data[altIndex] = data[i];
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284 data[i] = t;
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285 }
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286 }
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287
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288 private long rawDataToJLong(byte[] data) {
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289 long addr = 0;
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290 for (int i = 0; i < data.length; ++i) {
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291 addr <<= 8;
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292 addr |= data[i] & 0xFF;
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293 }
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294
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295 return addr;
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296 }
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297 }
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