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      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 java.io.IOException;
     20 import 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