Mercurial > 510Connectbot
annotate src/ch/ethz/ssh2/packets/TypesReader.java @ 273:91a31873c42a ganymed
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author | Carl Byington <carl@five-ten-sg.com> |
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date | Fri, 18 Jul 2014 11:21:46 -0700 |
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children | 071eccdff8ea |
rev | line source |
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1 /* |
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. |
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3 * Please refer to the LICENSE.txt for licensing details. |
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4 */ |
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5 package ch.ethz.ssh2.packets; |
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6 |
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7 import java.io.IOException; |
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8 import java.math.BigInteger; |
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9 |
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10 import ch.ethz.ssh2.PacketFormatException; |
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11 import ch.ethz.ssh2.util.StringEncoder; |
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12 |
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13 /** |
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14 * @author Christian Plattner |
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15 * @version $Id: TypesReader.java 160 2014-05-01 14:30:26Z dkocher@sudo.ch $ |
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16 */ |
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17 public final class TypesReader { |
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18 byte[] arr; |
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19 int pos = 0; |
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20 int max = 0; |
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21 |
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22 public TypesReader(byte[] arr) { |
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23 this.arr = arr; |
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24 pos = 0; |
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25 max = arr.length; |
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26 } |
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27 |
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28 public TypesReader(byte[] arr, int off) { |
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29 this.arr = arr; |
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30 this.pos = off; |
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31 this.max = arr.length; |
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32 |
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33 if((pos < 0) || (pos > arr.length)) { |
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34 throw new IllegalArgumentException("Illegal offset."); |
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35 } |
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36 } |
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37 |
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38 public TypesReader(byte[] arr, int off, int len) { |
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39 this.arr = arr; |
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40 this.pos = off; |
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41 this.max = off + len; |
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42 |
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43 if((pos < 0) || (pos > arr.length)) { |
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44 throw new IllegalArgumentException("Illegal offset."); |
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45 } |
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46 |
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47 if((max < 0) || (max > arr.length)) { |
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48 throw new IllegalArgumentException("Illegal length."); |
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49 } |
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50 } |
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51 |
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52 public int readByte() throws IOException { |
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53 if(pos >= max) { |
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54 throw new PacketFormatException("Packet too short."); |
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55 } |
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56 |
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57 return (arr[pos++] & 0xff); |
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58 } |
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59 |
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60 public byte[] readBytes(int len) throws IOException { |
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61 if((pos + len) > max) { |
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62 throw new PacketFormatException("Packet too short."); |
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63 } |
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64 |
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65 byte[] res = new byte[len]; |
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66 |
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67 System.arraycopy(arr, pos, res, 0, len); |
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68 pos += len; |
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69 |
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70 return res; |
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71 } |
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72 |
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73 public void readBytes(byte[] dst, int off, int len) throws IOException { |
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74 if((pos + len) > max) { |
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75 throw new PacketFormatException("Packet too short."); |
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76 } |
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77 |
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78 System.arraycopy(arr, pos, dst, off, len); |
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79 pos += len; |
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80 } |
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81 |
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82 public boolean readBoolean() throws IOException { |
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83 if(pos >= max) { |
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84 throw new PacketFormatException("Packet too short."); |
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85 } |
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86 |
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87 return (arr[pos++] != 0); |
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88 } |
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89 |
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90 public int readUINT32() throws IOException { |
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91 if((pos + 4) > max) { |
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92 throw new PacketFormatException("Packet too short."); |
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93 } |
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94 |
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95 return ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
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96 | (arr[pos++] & 0xff); |
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97 } |
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98 |
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99 public long readUINT64() throws IOException { |
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100 if((pos + 8) > max) { |
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101 throw new PacketFormatException("Packet too short."); |
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102 } |
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103 |
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104 long high = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
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105 | (arr[pos++] & 0xff); /* sign extension may take place - will be shifted away =) */ |
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106 |
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107 long low = ((arr[pos++] & 0xff) << 24) | ((arr[pos++] & 0xff) << 16) | ((arr[pos++] & 0xff) << 8) |
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108 | (arr[pos++] & 0xff); /* sign extension may take place - handle below */ |
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109 |
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110 return (high << 32) | (low & 0xffffffffl); /* see Java language spec (15.22.1, 5.6.2) */ |
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111 } |
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112 |
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113 public BigInteger readMPINT() throws IOException { |
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114 BigInteger b; |
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115 |
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116 byte raw[] = readByteString(); |
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117 |
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118 if(raw.length == 0) { |
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119 b = BigInteger.ZERO; |
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120 } |
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121 else { |
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122 b = new BigInteger(raw); |
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123 } |
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124 |
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125 return b; |
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126 } |
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127 |
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128 public byte[] readByteString() throws IOException { |
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129 int len = readUINT32(); |
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130 |
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131 if((len + pos) > max) { |
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132 throw new PacketFormatException("Malformed SSH byte string."); |
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133 } |
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134 |
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135 byte[] res = new byte[len]; |
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136 System.arraycopy(arr, pos, res, 0, len); |
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137 pos += len; |
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138 return res; |
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139 } |
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140 |
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141 public String readString(String charsetName) throws IOException { |
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142 int len = readUINT32(); |
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143 |
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144 if((len + pos) > max) { |
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145 throw new PacketFormatException("Malformed SSH string."); |
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146 } |
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147 |
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148 String res = (charsetName == null) ? new String(arr, pos, len) : new String(arr, pos, len, charsetName); |
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149 pos += len; |
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150 |
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151 return res; |
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152 } |
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153 |
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154 public String readString() throws IOException { |
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155 int len = readUINT32(); |
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156 |
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157 if((len + pos) > max) { |
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158 throw new PacketFormatException("Malformed SSH string."); |
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159 } |
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160 |
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161 String res = StringEncoder.GetString(arr, pos, len); |
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162 pos += len; |
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163 |
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164 return res; |
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165 } |
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166 |
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167 public String[] readNameList() throws IOException { |
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168 return readString().split(","); |
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169 } |
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170 |
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171 public int remain() { |
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172 return max - pos; |
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173 } |
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174 |
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175 } |