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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.bluetooth;
import java.io.IOException;
import java.io.InputStream;
/**
* BluetoothInputStream.
*
* Used to write to a Bluetooth socket.
*
* @hide
*/
/*package*/ final class BluetoothInputStream extends InputStream {
private BluetoothSocket mSocket;
/*package*/ BluetoothInputStream(BluetoothSocket s) {
mSocket = s;
}
/**
* Return number of bytes available before this stream will block.
*/
public int available() throws IOException {
return mSocket.available();
}
public void close() throws IOException {
mSocket.close();
}
/**
* Reads a single byte from this stream and returns it as an integer in the
* range from 0 to 255. Returns -1 if the end of the stream has been
* reached. Blocks until one byte has been read, the end of the source
* stream is detected or an exception is thrown.
*
* @return the byte read or -1 if the end of stream has been reached.
* @throws IOException
* if the stream is closed or another IOException occurs.
* @since Android 1.5
*/
public int read() throws IOException {
byte b[] = new byte[1];
int ret = mSocket.read(b, 0, 1);
if (ret == 1) {
return (int)b[0] & 0xff;
} else {
return -1;
}
}
/**
* Reads at most {@code length} bytes from this stream and stores them in
* the byte array {@code b} starting at {@code offset}.
*
* @param b
* the byte array in which to store the bytes read.
* @param offset
* the initial position in {@code buffer} to store the bytes
* read from this stream.
* @param length
* the maximum number of bytes to store in {@code b}.
* @return the number of bytes actually read or -1 if the end of the stream
* has been reached.
* @throws IndexOutOfBoundsException
* if {@code offset < 0} or {@code length < 0}, or if
* {@code offset + length} is greater than the length of
* {@code b}.
* @throws IOException
* if the stream is closed or another IOException occurs.
* @since Android 1.5
*/
public int read(byte[] b, int offset, int length) throws IOException {
if (b == null) {
throw new NullPointerException("byte array is null");
}
if ((offset | length) < 0 || length > b.length - offset) {
throw new ArrayIndexOutOfBoundsException("invalid offset or length");
}
return mSocket.read(b, offset, length);
}
}
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