1/*
2 * Copyright (c) 2016, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24import java.io.*;
25import java.nio.ByteBuffer;
26
27import jdk.incubator.http.internal.common.ByteBufferReference;
28import jdk.incubator.http.internal.common.Queue;
29import jdk.incubator.http.internal.common.Utils;
30import jdk.incubator.http.internal.frame.DataFrame;
31import jdk.incubator.http.internal.frame.Http2Frame;
32import jdk.incubator.http.internal.frame.ResetFrame;
33
34/**
35 * InputStream reads frames off stream q and supplies read demand from any
36 * DataFrames it finds. Window updates are sent back on the connections send
37 * q.
38 */
39class BodyInputStream extends InputStream {
40
41    final Queue<Http2Frame> q;
42    final int streamid;
43    boolean closed;
44    boolean eof;
45    final Http2TestServerConnection conn;
46
47    @SuppressWarnings({"rawtypes","unchecked"})
48    BodyInputStream(Queue q, int streamid, Http2TestServerConnection conn) {
49        this.q = q;
50        this.streamid = streamid;
51        this.conn = conn;
52    }
53
54    DataFrame df;
55    ByteBuffer[] buffers;
56    ByteBuffer buffer;
57    int nextIndex = -1;
58
59    private DataFrame getData() throws IOException {
60        if (eof) {
61            return null;
62        }
63        Http2Frame frame;
64        do {
65            frame = q.take();
66            if (frame.type() == ResetFrame.TYPE) {
67                conn.handleStreamReset((ResetFrame) frame); // throws IOException
68            }
69            // ignoring others for now Wupdates handled elsewhere
70            if (frame.type() != DataFrame.TYPE) {
71                System.out.println("Ignoring " + frame.toString() + " CHECK THIS");
72            }
73        } while (frame.type() != DataFrame.TYPE);
74        df = (DataFrame) frame;
75        int len = df.payloadLength();
76        eof = frame.getFlag(DataFrame.END_STREAM);
77        // acknowledge
78        conn.sendWindowUpdates(len, streamid);
79        return (DataFrame) frame;
80    }
81
82    // null return means EOF
83    private ByteBuffer getBuffer() throws IOException {
84        if (buffer == null || !buffer.hasRemaining()) {
85            if (nextIndex == -1 || nextIndex == buffers.length) {
86                DataFrame df = getData();
87                if (df == null) {
88                    return null;
89                }
90                ByteBufferReference[] data = df.getData();
91                int len = Utils.remaining(data);
92                if ((len == 0) && eof) {
93                    return null;
94                }
95
96                buffers = ByteBufferReference.toBuffers(data);
97                nextIndex = 0;
98            }
99            buffer = buffers[nextIndex++];
100        }
101        return buffer;
102    }
103
104    @Override
105    public int read(byte[] buf, int offset, int length) throws IOException {
106        if (closed) {
107            throw new IOException("closed");
108        }
109        ByteBuffer b = getBuffer();
110        if (b == null) {
111            return -1;
112        }
113        int remaining = b.remaining();
114        if (remaining < length) {
115            length = remaining;
116        }
117        b.get(buf, offset, length);
118        return length;
119    }
120
121    byte[] one = new byte[1];
122
123    @Override
124    public int read() throws IOException {
125        int c = read(one, 0, 1);
126        if (c == -1) {
127            return -1;
128        }
129        return one[0];
130    }
131
132    @Override
133    public void close() {
134        // TODO reset this stream
135        closed = true;
136    }
137}
138