1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.net.http;
18
19import java.io.IOException;
20import java.io.InputStream;
21import java.net.CacheRequest;
22import java.util.Arrays;
23
24/**
25 * An HTTP payload terminated by the end of the socket stream.
26 */
27final class UnknownLengthHttpInputStream extends AbstractHttpInputStream {
28    private boolean inputExhausted;
29
30    UnknownLengthHttpInputStream(InputStream is, CacheRequest cacheRequest,
31            HttpEngine httpEngine) throws IOException {
32        super(is, httpEngine, cacheRequest);
33    }
34
35    @Override public int read(byte[] buffer, int offset, int count) throws IOException {
36        Arrays.checkOffsetAndCount(buffer.length, offset, count);
37        checkNotClosed();
38        if (in == null || inputExhausted) {
39            return -1;
40        }
41        int read = in.read(buffer, offset, count);
42        if (read == -1) {
43            inputExhausted = true;
44            endOfInput(false);
45            return -1;
46        }
47        cacheWrite(buffer, offset, read);
48        return read;
49    }
50
51    @Override public int available() throws IOException {
52        checkNotClosed();
53        return in == null ? 0 : in.available();
54    }
55
56    @Override public void close() throws IOException {
57        if (closed) {
58            return;
59        }
60        closed = true;
61        if (!inputExhausted) {
62            unexpectedEndOfInput();
63        }
64    }
65}
66