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annotate src/ch/ethz/ssh2/packets/TypesReader.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
parents
children 071eccdff8ea
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rev   line source
273
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Carl Byington <carl@five-ten-sg.com>
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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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Carl Byington <carl@five-ten-sg.com>
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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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parents:
diff changeset
150
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 return res;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 public String readString() throws IOException {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155 int len = readUINT32();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157 if((len + pos) > max) {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 throw new PacketFormatException("Malformed SSH string.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161 String res = StringEncoder.GetString(arr, pos, len);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162 pos += len;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
163
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 return res;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 public String[] readNameList() throws IOException {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 return readString().split(",");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 public int remain() {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 return max - pos;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 }