/*
*
*
* Copyright 1990-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.jsr082.bluetooth;
/*
* BluetoothStack implementation which relies on HCI command/event flow.
*/
public class GenericBluetoothStack extends BluetoothStack {
/* Maximum HCI packet size as defined by Bluetooth 1.1 specification. */
private final int MAX_HCI_PACKET_SIZE = 257;
/* HCI Inquiry Complete event code. */
private final int HCI_INQUIRY_COMPLETE = 0x01;
/* HCI Inquiry Result event code. */
private final int HCI_INQUIRY_RESULT = 0x02;
/* HCI Authentication Complete event code. */
private final int HCI_AUTH_COMPLETE = 0x06;
/* HCI Remote Name Request Complete event code. */
private final int HCI_NAME_COMPLETE = 0x07;
/* HCI Encrypt Change event code. */
private final int HCI_ENCRYPT_CHANGE = 0x08;
/* Internal byte array for storing incoming HCI events. */
private byte[] buffer = new byte[MAX_HCI_PACKET_SIZE];
/*
* Extracts Bluetooth address from the internal buffer.
*
* @param offset offset in the internal buffer
* @return Bluetooth address consisting of 12 hexadecimal characters
*/
protected String extractAddress(int offset) {
byte[] addr = new byte[BluetoothUtils.BTADDR_SIZE];
System.arraycopy(buffer, offset, addr, 0, BluetoothUtils.BTADDR_SIZE);
return BluetoothUtils.getAddressString(addr);
}
/*
* Extracts string (e.g. friendly name) from the internal buffer. The
* string is stored in UTF-8 format and is terminated by NULL character.
*
* @param offset offset in the internal buffer
* @return Java string retrieved from binary event data
*/
protected String extractString(int offset) {
int length = 0;
while (offset + length < MAX_HCI_PACKET_SIZE &&
buffer[offset + length] != 0) {
length++;
}
try {
return new String(buffer, offset, length, "UTF-8");
} catch(java.io.UnsupportedEncodingException e) {
// can't get here cause UTF-8 must be supported
throw new RuntimeException(e);
}
}
/*
* Extracts 2 octets from the internal buffer.
*
* @param offset offset in the internal buffer
* @return 16 bits of data from the given offset
*/
protected int extractShort(int offset) {
return ((int)buffer[offset] & 0xff) |
(((int)buffer[offset + 1] & 0xff) << 8);
}
/*
* Retrieves Bluetooth event from HCI event data containing in the
* internal buffer.
*
* @return BluetoothEvent subclass instance
*/
protected BluetoothEvent retrieveEvent() {
readData(buffer);
int code = buffer[0];
int len = buffer[1];
switch (code) {
case HCI_INQUIRY_COMPLETE:
return new InquiryCompleteEvent(buffer[2] == 0);
case HCI_INQUIRY_RESULT:
int num = buffer[2];
int offset = 3;
InquiryResult[] results = new InquiryResult[num];
for (int i = 0; i < num; i++) {
String addr = extractAddress(offset);
int cod = (buffer[offset + 9] & 0xFF) + ((buffer[offset + 10] & 0xFF) << 8) +
((buffer[offset + 11] & 0xFF) << 16);
results[i] = new InquiryResult(addr, cod);
offset += 14; // 14 is the size of the response structure
}
return new InquiryResultEvent(results);
case HCI_AUTH_COMPLETE:
return new AuthenticationCompleteEvent(extractShort(3),
buffer[2] == 0);
case HCI_NAME_COMPLETE:
return new NameResultEvent(extractAddress(3), extractString(9));
case HCI_ENCRYPT_CHANGE:
return new EncryptionChangeEvent(extractShort(3),
buffer[2] == 0, buffer[5] == 1);
default:
return null;
}
}
}