1 | /**
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2 | * ImageSaver.java
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3 | * Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
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4 | *
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5 | * This program is free software: you can redistribute it and/or modify
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6 | * it under the terms of the GNU General Public License as published by
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7 | * the Free Software Foundation, either version 3 of the License, or
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8 | * (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 | */
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18 |
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19 | package org.expeditee.network;
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20 |
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21 | import java.io.File;
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22 | import java.io.FileOutputStream;
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23 | import java.io.IOException;
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24 | import java.io.InputStream;
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25 | import java.io.OutputStream;
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26 | import java.net.ServerSocket;
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27 | import java.net.Socket;
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28 | import java.util.ArrayList;
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29 | import java.util.List;
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30 |
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31 | import org.expeditee.gui.FrameIO;
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32 |
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33 | public class ImageSaver extends DefaultServer {
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34 |
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35 | public static boolean recvImage(File file, Socket socket) throws IOException {
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36 | InputStream is = socket.getInputStream();
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37 | // file length is the first 4 bytes
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38 | int fileLen = (is.read() << 24) | (is.read() << 16) | (is.read() << 8) | is.read();
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39 | // if the above reads failed, fileLen will be -1
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40 | if(fileLen <= 0) {
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41 | return false;
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42 | }
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43 | if(file.exists()) {
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44 | System.out.println("Ignoring " + file.getName() + " (already exists on filesystem)");
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45 | is.skip(fileLen);
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46 | return false;
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47 | }
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48 | System.out.println("Receiving " + file.getName() + " (" + fileLen + " bytes)");
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49 | file.getParentFile().mkdirs();
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50 | FileOutputStream out = new FileOutputStream(file);
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51 | // file is the remaining bytes of the stream
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52 | byte[] buf = new byte[1024];
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53 | int r = -1;
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54 | int len = 0;
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55 | while((r = is.read(buf)) > 0) {
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56 | out.write(buf, 0, r);
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57 | len += r;
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58 | if(fileLen - len <= 0) {
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59 | break;
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60 | }
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61 | if(fileLen - len < 1024) {
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62 | buf = new byte[fileLen - len];
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63 | }
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64 | }
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65 | out.flush();
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66 | out.close();
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67 | return true;
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68 | }
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69 |
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70 | /**
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71 | * Reads an image storage request, and saves the image on the server
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72 | *
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73 | * @author jts21
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74 | *
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75 | */
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76 | private static class ImageReceiver extends Thread {
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77 |
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78 | private Socket socket;
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79 |
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80 | public ImageReceiver(Socket client) {
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81 | super("ImageReceiver");
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82 | this.socket = client;
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83 | }
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84 |
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85 | @Override
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86 | public void run() {
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87 | try {
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88 | InputStream is = this.socket.getInputStream();
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89 | OutputStream os = this.socket.getOutputStream();
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90 | // number of files is the first byte
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91 | int numFiles = is.read() << 8 | is.read();
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92 | if(numFiles == -1)
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93 | return;
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94 | // read the filenames
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95 | File[] files = new File[numFiles];
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96 | List<Integer> wantFiles = new ArrayList<Integer>();
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97 | for(int i = 0; i < numFiles; i++) {
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98 | int fileNameLen = is.read();
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99 | byte[] fileName = new byte[fileNameLen];
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100 | is.read(fileName);
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101 | files[i] = new File(FrameIO.IMAGES_PATH + new String(fileName, FrameShare.CHARSET));
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102 | // pick out which files we want
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103 | if(!files[i].exists()) {
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104 | wantFiles.add(i);
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105 | os.write(i);
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106 | }
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107 | }
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108 | // close the output stream since we won't be sending anything more
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109 | this.socket.shutdownOutput();
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110 | // get the files
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111 | for(Integer i : wantFiles) {
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112 | recvImage(files[i], socket);
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113 | }
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114 | this.socket.close();
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115 | } catch (IOException e) {
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116 | e.printStackTrace();
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117 | }
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118 | }
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119 | }
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120 |
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121 | public final static int OFFSET = 6;
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122 |
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123 | private ServerSocket socket;
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124 |
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125 | public ImageSaver(int port) throws IOException {
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126 | super("ImageSaver");
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127 | this.socket = new ServerSocket(port + OFFSET);
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128 | }
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129 |
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130 | @Override
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131 | protected void listenForMessages() throws IOException {
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132 | Socket client = socket.accept();
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133 | // should probably only allow a limited number of threads here
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134 | new ImageReceiver(client).start();
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135 | }
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136 |
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137 | @Override
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138 | protected void closeSocket() {
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139 | try {
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140 | socket.close();
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141 | } catch (IOException e) {
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142 | e.printStackTrace();
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143 | }
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144 | }
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145 | }
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