1 /*
   2  * Copyright (c) 1994, 2002, 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.lang.StringIndexOutOfBoundsException;
  29 import java.io.*;
  30 import java.util.Vector;
  31 import sun.net.NetworkClient;
  32 
  33 /**
  34  * This class implements that basic intefaces of transfer protocols.
  35  * It is used by subclasses implementing specific protocols.
  36  *
  37  * @author      Jonathan Payne
  38  * @see         sun.net.ftp.FtpClient
  39  * @see         sun.net.nntp.NntpClient
  40  */
  41 
  42 public class TransferProtocolClient extends NetworkClient {
  43     static final boolean debug = false;
  44 
  45     /** Array of strings (usually 1 entry) for the last reply
  46         from the server. */
  47     protected Vector    serverResponse = new Vector(1);
  48 
  49     /** code for last reply */
  50     protected int       lastReplyCode;
  51 
  52 
  53     /**
  54      * Pulls the response from the server and returns the code as a
  55      * number. Returns -1 on failure.
  56      */
  57     public int readServerResponse() throws IOException {
  58         StringBuffer    replyBuf = new StringBuffer(32);
  59         int             c;
  60         int             continuingCode = -1;
  61         int             code;
  62         String          response;
  63 
  64         serverResponse.setSize(0);
  65         while (true) {
  66             while ((c = serverInput.read()) != -1) {
  67                 if (c == '\r') {
  68                     if ((c = serverInput.read()) != '\n')
  69                         replyBuf.append('\r');
  70                 }
  71                 replyBuf.append((char)c);
  72                 if (c == '\n')
  73                     break;
  74             }
  75             response = replyBuf.toString();
  76             replyBuf.setLength(0);
  77             if (debug) {
  78                 System.out.print(response);
  79             }
  80 
  81             if (response.length() == 0) {
  82                 code = -1;
  83             } else {
  84                 try {
  85                     code = Integer.parseInt(response.substring(0, 3));
  86                 } catch (NumberFormatException e) {
  87                     code = -1;
  88                 } catch (StringIndexOutOfBoundsException e) {
  89                     /* this line doesn't contain a response code, so
  90                        we just completely ignore it */
  91                     continue;
  92                 }
  93             }
  94             serverResponse.addElement(response);
  95             if (continuingCode != -1) {
  96                 /* we've seen a XXX- sequence */
  97                 if (code != continuingCode ||
  98                     (response.length() >= 4 && response.charAt(3) == '-')) {
  99                     continue;
 100                 } else {
 101                     /* seen the end of code sequence */
 102                     continuingCode = -1;
 103                     break;
 104                 }
 105             } else if (response.length() >= 4 && response.charAt(3) == '-') {
 106                 continuingCode = code;
 107                 continue;
 108             } else {
 109                 break;
 110             }
 111         }
 112 
 113         return lastReplyCode = code;
 114     }
 115 
 116     /** Sends command <i>cmd</i> to the server. */
 117     public void sendServer(String cmd) {
 118         serverOutput.print(cmd);
 119         if (debug) {
 120             System.out.print("Sending: " + cmd);
 121         }
 122     }
 123 
 124     /** converts the server response into a string. */
 125     public String getResponseString() {
 126         return (String) serverResponse.elementAt(0);
 127     }
 128 
 129     /** Returns all server response strings. */
 130     public Vector getResponseStrings() {
 131         return serverResponse;
 132     }
 133 
 134     /** standard constructor to host <i>host</i>, port <i>port</i>. */
 135     public TransferProtocolClient(String host, int port) throws IOException {
 136         super(host, port);
 137     }
 138 
 139     /** creates an uninitialized instance of this class. */
 140     public TransferProtocolClient() {}
 141 }