1 /*
   2  * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.net;
  27 
  28 import java.io.*;
  29 import java.util.Vector;
  30 
  31 /**
  32  * This class implements that basic intefaces of transfer protocols.
  33  * It is used by subclasses implementing specific protocols.
  34  *
  35  * @author      Jonathan Payne
  36  * @see         sun.net.ftp.FtpClient
  37  * @see         sun.net.nntp.NntpClient
  38  */
  39 
  40 public class TransferProtocolClient extends NetworkClient {
  41     static final boolean debug = false;
  42 
  43     /** Array of strings (usually 1 entry) for the last reply
  44         from the server. */
  45     protected Vector<String> serverResponse = new Vector<>(1);
  46 
  47     /** code for last reply */
  48     protected int       lastReplyCode;
  49 
  50 
  51     /**
  52      * Pulls the response from the server and returns the code as a
  53      * number. Returns -1 on failure.
  54      */
  55     public int readServerResponse() throws IOException {
  56         StringBuilder   replyBuf = new StringBuilder(32);
  57         int             c;
  58         int             continuingCode = -1;
  59         int             code;
  60         String          response;
  61 
  62         serverResponse.setSize(0);
  63         while (true) {
  64             while ((c = serverInput.read()) != -1) {
  65                 if (c == '\r') {
  66                     if ((c = serverInput.read()) != '\n')
  67                         replyBuf.append('\r');
  68                 }
  69                 replyBuf.append((char)c);
  70                 if (c == '\n')
  71                     break;
  72             }
  73             response = replyBuf.toString();
  74             replyBuf.setLength(0);
  75             if (debug) {
  76                 System.out.print(response);
  77             }
  78 
  79             if (response.length() == 0) {
  80                 code = -1;
  81             } else {
  82                 try {
  83                     code = Integer.parseInt(response, 0, 3, 10);
  84                 } catch (NumberFormatException e) {
  85                     code = -1;
  86                 } catch (IndexOutOfBoundsException e) {
  87                     /* this line doesn't contain a response code, so
  88                        we just completely ignore it */
  89                     continue;
  90                 }
  91             }
  92             serverResponse.addElement(response);
  93             if (continuingCode != -1) {
  94                 /* we've seen a XXX- sequence */
  95                 if (code != continuingCode ||
  96                     (response.length() >= 4 && response.charAt(3) == '-')) {
  97                     continue;
  98                 } else {
  99                     /* seen the end of code sequence */
 100                     continuingCode = -1;
 101                     break;
 102                 }
 103             } else if (response.length() >= 4 && response.charAt(3) == '-') {
 104                 continuingCode = code;
 105                 continue;
 106             } else {
 107                 break;
 108             }
 109         }
 110 
 111         return lastReplyCode = code;
 112     }
 113 
 114     /** Sends command <i>cmd</i> to the server. */
 115     public void sendServer(String cmd) {
 116         serverOutput.print(cmd);
 117         if (debug) {
 118             System.out.print("Sending: " + cmd);
 119         }
 120     }
 121 
 122     /** converts the server response into a string. */
 123     public String getResponseString() {
 124         return serverResponse.elementAt(0);
 125     }
 126 
 127     /** Returns all server response strings. */
 128     public Vector<String> getResponseStrings() {
 129         return serverResponse;
 130     }
 131 
 132     /** standard constructor to host <i>host</i>, port <i>port</i>. */
 133     public TransferProtocolClient(String host, int port) throws IOException {
 134         super(host, port);
 135     }
 136 
 137     /** creates an uninitialized instance of this class. */
 138     public TransferProtocolClient() {}
 139 }