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 
17 package android.bluetooth;
18 
19 import android.annotation.SuppressLint;
20 
21 import java.io.IOException;
22 import java.io.InputStream;
23 
24 /**
25  * BluetoothInputStream.
26  *
27  * Used to write to a Bluetooth socket.
28  *
29  * @hide
30  */
31 @SuppressLint("AndroidFrameworkBluetoothPermission")
32 /*package*/ final class BluetoothInputStream extends InputStream {
33     private BluetoothSocket mSocket;
34 
BluetoothInputStream(BluetoothSocket s)35     /*package*/ BluetoothInputStream(BluetoothSocket s) {
36         mSocket = s;
37     }
38 
39     /**
40      * Return number of bytes available before this stream will block.
41      */
available()42     public int available() throws IOException {
43         return mSocket.available();
44     }
45 
close()46     public void close() throws IOException {
47         mSocket.close();
48     }
49 
50     /**
51      * Reads a single byte from this stream and returns it as an integer in the
52      * range from 0 to 255. Returns -1 if the end of the stream has been
53      * reached. Blocks until one byte has been read, the end of the source
54      * stream is detected or an exception is thrown.
55      *
56      * @return the byte read or -1 if the end of stream has been reached.
57      * @throws IOException if the stream is closed or another IOException occurs.
58      * @since Android 1.5
59      */
read()60     public int read() throws IOException {
61         byte[] b = new byte[1];
62         int ret = mSocket.read(b, 0, 1);
63         if (ret == 1) {
64             return (int) b[0] & 0xff;
65         } else {
66             return -1;
67         }
68     }
69 
70     /**
71      * Reads at most {@code length} bytes from this stream and stores them in
72      * the byte array {@code b} starting at {@code offset}.
73      *
74      * @param b the byte array in which to store the bytes read.
75      * @param offset the initial position in {@code buffer} to store the bytes read from this
76      * stream.
77      * @param length the maximum number of bytes to store in {@code b}.
78      * @return the number of bytes actually read or -1 if the end of the stream has been reached.
79      * @throws IndexOutOfBoundsException if {@code offset < 0} or {@code length < 0}, or if {@code
80      * offset + length} is greater than the length of {@code b}.
81      * @throws IOException if the stream is closed or another IOException occurs.
82      * @since Android 1.5
83      */
read(byte[] b, int offset, int length)84     public int read(byte[] b, int offset, int length) throws IOException {
85         if (b == null) {
86             throw new NullPointerException("byte array is null");
87         }
88         if ((offset | length) < 0 || length > b.length - offset) {
89             throw new ArrayIndexOutOfBoundsException("invalid offset or length");
90         }
91         return mSocket.read(b, offset, length);
92     }
93 }
94