1 /*
   2  * Copyright (c) 2005, 2008, 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.httpserver;
  27 
  28 import java.io.*;
  29 import java.net.*;
  30 import com.sun.net.httpserver.*;
  31 import com.sun.net.httpserver.spi.*;
  32 
  33 /**
  34  * a class which allows the caller to read up to a defined
  35  * number of bytes off an underlying stream
  36  * close() does not close the underlying stream
  37  */
  38 
  39 class FixedLengthInputStream extends LeftOverInputStream {
  40     private long remaining;
  41 
  42     FixedLengthInputStream (ExchangeImpl t, InputStream src, long len) {
  43         super (t, src);
  44         this.remaining = len;
  45     }
  46 
  47     protected int readImpl (byte[]b, int off, int len) throws IOException {
  48 
  49         eof = (remaining == 0L);
  50         if (eof) {
  51             return -1;
  52         }
  53         if (len > remaining) {
  54             len = (int)remaining;
  55         }
  56         int n = in.read(b, off, len);
  57         if (n > -1) {
  58             remaining -= n;
  59             if (remaining == 0) {
  60                 t.getServerImpl().requestCompleted (t.getConnection());
  61             }
  62         }
  63         return n;
  64     }
  65 
  66     public int available () throws IOException {
  67         if (eof) {
  68             return 0;
  69         }
  70         int n = in.available();
  71         return n < remaining? n: (int)remaining;
  72     }
  73 
  74     public boolean markSupported () {return false;}
  75 
  76     public void mark (int l) {
  77     }
  78 
  79     public void reset () throws IOException {
  80         throw new IOException ("mark/reset not supported");
  81     }
  82 }