servicedb.c

蓝牙的各种编程接口和各种按理介绍,还有一些例子和说明

/*
   Service Discovery Protocol (SDP)
   Copyright (C) 2002 Maxim Krasnyansky <[e-mail]>, Stephen Crane <[e-mail]>
   
   Based on original SDP implementation by Nokia Corporation.
   Copyright (C) 2001,2002 Nokia Corporation.
   Original author Guruprasad Krishnamurthy <[e-mail]>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;
   
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY CLAIM,
   OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER
   RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
   USE OR PERFORMANCE OF THIS SOFTWARE.
   
   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, COPYRIGHTS,
   TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS SOFTWARE IS DISCLAIMED.
*/

/*
   Service repository.
   Has methods to create and clean the repository, besides
   methods to add/find/modify/delete individual entries

   Fixes:
	Guruprasad Krishnamurthy <[e-mail]>
	Manel Guerrero Zapata <[e-mail]>
*/

/*
 * $Id: servicedb.c,v 1.13 2003/06/17 13:12:36 jscrane Exp $
 */

#include <malloc.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/l2cap.h>

#include "sdp.h"
#include "sdp_internal.h"
#include "sdp_lib.h"
#include "sdpd.h"

static sdp_list_t *service_db;

/*
 * Ordering function called when inserting a service record.
 * The service repository is a linked list in sorted order
 * and the service record handle is the sort key
 */
static int record_sort(const void *r1, const void *r2)
{
	const sdp_record_t *rec1 = (const sdp_record_t *)r1;
	const sdp_record_t *rec2 = (const sdp_record_t *)r2;

	if (!rec1 || !rec2) {
		SDPERR("NULL RECORD LIST FATAL\n");
		return -1;
	}
	return rec1->handle - rec2->handle;
}

/*
 * Reset the service repository by deleting its contents
 */
void sdp_svcdb_reset()
{
	sdp_list_free(service_db, (sdp_free_func_t)sdp_record_free);
}

typedef struct _indexed {
	int sock;
	sdp_record_t *record;
} sdp_indexed_t;

static sdp_list_t *socket_index;

/*
 * collect all services registered over this socket
 */
void sdp_svcdb_collect_all(int sock)
{
	sdp_list_t *p, *q;

	for (p=socket_index, q=0; p; ) {
		sdp_indexed_t *item = (sdp_indexed_t *)p->data;
		if (item->sock == sock) {
			sdp_list_t *next = p->next;
			sdp_record_remove(item->record->handle);
			free(item);
			if (q)
				q->next = next;
			else
				socket_index = next;
			free(p);
			p = next;
		} else if (item->sock > sock)
			return;
		else {
			q = p;
			p = p->next;
		}
	}
}

void sdp_svcdb_collect(sdp_record_t *rec)
{
	sdp_list_t *p, *q;

	for (p=socket_index, q=0; p; q=p, p=p->next) {
		sdp_indexed_t *item = (sdp_indexed_t *)p->data;
		if (rec == item->record) {
			free(item);
			if (q)
				q->next = p->next;
			else
				socket_index = p->next;
			free(p);
			return;
		}
	}
}

static int compare_indices(const void *i1, const void *i2)
{
	const sdp_indexed_t *s1 = (const sdp_indexed_t *)i1;
	const sdp_indexed_t *s2 = (const sdp_indexed_t *)i2;
	return s1->sock - s2->sock;
}

void sdp_svcdb_set_collectable(sdp_record_t *record, int sock)
{
	sdp_indexed_t *item = (sdp_indexed_t *)malloc(sizeof(sdp_indexed_t));
	item->sock = sock;
	item->record = record;
	socket_index = sdp_list_insert_sorted(socket_index, item, compare_indices);
}

/*
 * Add a service record to the repository
 */
void sdp_record_add(sdp_record_t *rec)
{
#ifdef SDP_DEBUG
	SDPDBG("Adding rec : 0x%lx\n", (long)rec);
	SDPDBG("with handle : 0x%lx\n", (long)rec->handle);
#endif
	service_db = sdp_list_insert_sorted(service_db, rec, record_sort);
}

static sdp_list_t *record_locate(uint32_t handle)
{
	if (service_db) {
		sdp_list_t *p;
		sdp_record_t r;

		r.handle = handle;
		p = sdp_list_find(service_db, &r, record_sort);
		return p;
	}
	SDPDBG("Could not find svcRec for : 0x%x\n", handle);
	return 0;
}

/*
 * Given a service record handle, find the record associated with it.
 */
sdp_record_t *sdp_record_find(uint32_t handle)
{
        sdp_list_t *p = record_locate(handle);

        if (p)
                return (sdp_record_t *)p->data;
	SDPDBG("Couldn't find record for : 0x%x\n", handle);
        return 0;
}

/*
 * Given a service record handle, remove its record from the repository
 */
int sdp_record_remove(uint32_t handle)
{
	sdp_list_t *p = record_locate(handle);

	if (p) {
		sdp_record_t *r = (sdp_record_t *)p->data;
		if (r) {
			service_db = sdp_list_remove(service_db, r);
			return 0;
		}
	}
	SDPERR("Remove : Couldn't find record for : 0x%x\n", handle);
	return -1;
}

/*
 * Return a pointer to the linked list containing the records in sorted order
 */
sdp_list_t *sdp_get_record_list()
{
	return service_db;
}