1/*
2 * Copyright (C) 2009 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 android.bluetooth;
18
19import java.io.IOException;
20import java.io.InputStream;
21
22/**
23 * BluetoothInputStream.
24 *
25 * Used to write to a Bluetooth socket.
26 *
27 * @hide
28 */
29/*package*/ final class BluetoothInputStream extends InputStream {
30    private BluetoothSocket mSocket;
31
32    /*package*/ BluetoothInputStream(BluetoothSocket s) {
33        mSocket = s;
34    }
35
36    /**
37     * Return number of bytes available before this stream will block.
38     */
39    public int available() throws IOException {
40        return mSocket.available();
41    }
42
43    public void close() throws IOException {
44        mSocket.close();
45    }
46
47    /**
48     * Reads a single byte from this stream and returns it as an integer in the
49     * range from 0 to 255. Returns -1 if the end of the stream has been
50     * reached. Blocks until one byte has been read, the end of the source
51     * stream is detected or an exception is thrown.
52     *
53     * @return the byte read or -1 if the end of stream has been reached.
54     * @throws IOException if the stream is closed or another IOException occurs.
55     * @since Android 1.5
56     */
57    public int read() throws IOException {
58        byte[] b = new byte[1];
59        int ret = mSocket.read(b, 0, 1);
60        if (ret == 1) {
61            return (int) b[0] & 0xff;
62        } else {
63            return -1;
64        }
65    }
66
67    /**
68     * Reads at most {@code length} bytes from this stream and stores them in
69     * the byte array {@code b} starting at {@code offset}.
70     *
71     * @param b the byte array in which to store the bytes read.
72     * @param offset the initial position in {@code buffer} to store the bytes read from this
73     * stream.
74     * @param length the maximum number of bytes to store in {@code b}.
75     * @return the number of bytes actually read or -1 if the end of the stream has been reached.
76     * @throws IndexOutOfBoundsException if {@code offset < 0} or {@code length < 0}, or if {@code
77     * offset + length} is greater than the length of {@code b}.
78     * @throws IOException if the stream is closed or another IOException occurs.
79     * @since Android 1.5
80     */
81    public int read(byte[] b, int offset, int length) throws IOException {
82        if (b == null) {
83            throw new NullPointerException("byte array is null");
84        }
85        if ((offset | length) < 0 || length > b.length - offset) {
86            throw new ArrayIndexOutOfBoundsException("invalid offset or length");
87        }
88        return mSocket.read(b, offset, length);
89    }
90}
91