1/*
2 * Copyright (c) 2005, 2006, 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 write up to a defined
35 * number of bytes to an underlying stream. The caller *must*
36 * write the pre-defined number or else an exception will be thrown
37 * and the whole request aborted.
38 * normal close() does not close the underlying stream
39 */
40
41class FixedLengthOutputStream extends FilterOutputStream
42{
43    private long remaining;
44    private boolean eof = false;
45    private boolean closed = false;
46    ExchangeImpl t;
47
48    FixedLengthOutputStream (ExchangeImpl t, OutputStream src, long len) {
49        super (src);
50        this.t = t;
51        this.remaining = len;
52    }
53
54    public void write (int b) throws IOException {
55        if (closed) {
56            throw new IOException ("stream closed");
57        }
58        eof = (remaining == 0);
59        if (eof) {
60            throw new StreamClosedException();
61        }
62        out.write(b);
63        remaining --;
64    }
65
66    public void write (byte[]b, int off, int len) throws IOException {
67        if (closed) {
68            throw new IOException ("stream closed");
69        }
70        eof = (remaining == 0);
71        if (eof) {
72            throw new StreamClosedException();
73        }
74        if (len > remaining) {
75            // stream is still open, caller can retry
76            throw new IOException ("too many bytes to write to stream");
77        }
78        out.write(b, off, len);
79        remaining -= len;
80    }
81
82    public void close () throws IOException {
83        if (closed) {
84            return;
85        }
86        closed = true;
87        if (remaining > 0) {
88            t.close();
89            throw new IOException ("insufficient bytes written to stream");
90        }
91        flush();
92        eof = true;
93        LeftOverInputStream is = t.getOriginalInputStream();
94        if (!is.isClosed()) {
95            try {
96                is.close();
97            } catch (IOException e) {}
98        }
99        WriteFinishedEvent e = new WriteFinishedEvent (t);
100        t.getHttpContext().getServerImpl().addEvent (e);
101    }
102
103    // flush is a pass-through
104}
105