1/*
2 * Copyright (c) 2005, 2010, 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
26package sun.net.httpserver;
27
28import java.io.*;
29import java.net.*;
30import com.sun.net.httpserver.*;
31import 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
39class 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}
83