Mercurial > hg > Applications > TightVNC_orginal

annotate src/main/java/com/glavsoft/transport/Reader.java @ 52:472a9bcacb21 draft default tip

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TightVNC 2.7.1.0
author you@cr.ie.u-ryukyu.ac.jp
date Wed, 07 Aug 2013 19:01:17 +0900
parents 4689cc86d6cb
children
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1 // Copyright (C) 2010, 2011, 2012, 2013 GlavSoft LLC.
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2 // All rights reserved.
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3 //
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4 //-------------------------------------------------------------------------
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5 // This file is part of the TightVNC software. Please visit our Web site:
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6 //
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7 // http://www.tightvnc.com/
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8 //
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9 // This program is free software; you can redistribute it and/or modify
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10 // it under the terms of the GNU General Public License as published by
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11 // the Free Software Foundation; either version 2 of the License, or
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12 // (at your option) any later version.
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13 //
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14 // This program is distributed in the hope that it will be useful,
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15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 // GNU General Public License for more details.
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18 //
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19 // You should have received a copy of the GNU General Public License along
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20 // with this program; if not, write to the Free Software Foundation, Inc.,
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21 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 //-------------------------------------------------------------------------
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23 //
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24
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25 package com.glavsoft.transport;
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26
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27 import com.glavsoft.exceptions.ClosedConnectionException;
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28 import com.glavsoft.exceptions.TransportException;
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29
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30 import java.io.*;
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31 import java.nio.charset.Charset;
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32
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33 public class Reader {
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34 final static Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
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35 final static Charset UTF8 = Charset.forName("UTF-8");
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36 private final DataInputStream is;
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37
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38 public Reader(InputStream is) {
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39 this.is = new DataInputStream(new BufferedInputStream(is));
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40 }
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41
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42 public byte readByte() throws TransportException {
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43 try {
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44 byte readByte = is.readByte();
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45 return readByte;
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46 } catch (EOFException e) {
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47 throw new ClosedConnectionException(e);
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48 } catch (IOException e) {
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49 throw new TransportException("Cannot read byte", e);
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50 }
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52 }
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54 public int readUInt8() throws TransportException {
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55 return readByte() & 0x0ff;
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56 }
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57
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58 public int readUInt16() throws TransportException {
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59 return readInt16() & 0x0ffff;
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60 }
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61
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62 public short readInt16() throws TransportException {
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63 try {
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64 short readShort = is.readShort();
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65 return readShort;
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66 } catch (EOFException e) {
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67 throw new ClosedConnectionException(e);
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68 } catch (IOException e) {
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69 throw new TransportException("Cannot read int16", e);
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70 }
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71 }
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72
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73 public long readUInt32() throws TransportException {
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74 return readInt32() & 0xffffffffL;
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75 }
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76
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77 public int readInt32() throws TransportException {
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78 try {
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79 int readInt = is.readInt();
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80 return readInt;
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81 } catch (EOFException e) {
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82 throw new ClosedConnectionException(e);
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83 } catch (IOException e) {
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84 throw new TransportException("Cannot read int32", e);
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85 }
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86 }
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87
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88 public long readInt64() throws TransportException {
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89 try {
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90 return is.readLong();
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91 } catch (EOFException e) {
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92 throw new ClosedConnectionException(e);
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93 } catch (IOException e) {
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94 throw new TransportException("Cannot read int32", e);
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95 }
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96 }
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97
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98 /**
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99 * Read string by it length.
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100 * Use this method only when sure no character accept ASCII will be read.
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101 * Use readBytes and character encoding conversion instead.
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102 *
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103 * @return String read
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104 */
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105 public String readString(int length) throws TransportException {
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106 return new String(readBytes(length));
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107 }
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108
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109 /**
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110 * Read 32-bit string length and then string themself by it length
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111 * Use this method only when sure no character accept ASCII will be read.
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112 * Use readBytes and character encoding conversion instead or {@link #readUtf8String} method
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113 * when utf-8 encoding needed.
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114 *
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115 * @return String read
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116 * @throws TransportException
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117 */
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118 public String readString() throws TransportException {
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119 // unset most significant (sign) bit 'cause InputStream#readFully reads
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120 // [int] length bytes from stream. Change when really need read string more
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121 // than 2147483647 bytes length
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122 int length = readInt32() & Integer.MAX_VALUE;
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123 return readString(length);
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124 }
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125
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126 /**
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127 * Read 32-bit string length and then string themself by it length
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128 * Assume UTF-8 character encoding used
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129 *
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130 * @return String read
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131 * @throws TransportException
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132 */
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133 public String readUtf8String() throws TransportException {
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134 // unset most significant (sign) bit 'cause InputStream#readFully reads
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135 // [int] length bytes from stream. Change when really need read string more
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136 // than 2147483647 bytes length
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137 int length = readInt32() & Integer.MAX_VALUE;
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138 return new String(readBytes(length));
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139 }
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140
0
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141 public byte[] readBytes(int length) throws TransportException {
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142 byte b[] = new byte[length];
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143 return readBytes(b, 0, length);
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144 }
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145
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146 public byte[] readBytes(byte[] b, int offset, int length) throws TransportException {
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147 try {
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148 is.readFully(b, offset, length);
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149 return b;
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150 } catch (EOFException e) {
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151 throw new ClosedConnectionException(e);
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152 } catch (IOException e) {
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153 throw new TransportException("Cannot read " + length + " bytes array", e);
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154 }
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155 }
52
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156
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157 public void skip(int length) throws TransportException {
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158 try {
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159 is.skipBytes(length);
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160 } catch (EOFException e) {
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161 throw new ClosedConnectionException(e);
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162 } catch (IOException e) {
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163 throw new TransportException("Cannot skip " + length + " bytes", e);
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164 }
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165 }
0
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166 }