This patch adds the gatt_db_insert_service function which inserts a
service with a pre-defined handle into the database if the desired
handle range is available.
This is primarily meant to be used by gatt-client, since the handles
in a client database need to perfectly match those returned from a
remote server. This also allows client to handle "Service Changed"
events in which a newly found service can be inserted at the correct
location within the database.
---
src/shared/gatt-db.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++-----
src/shared/gatt-db.h | 6 +++
2 files changed, 118 insertions(+), 10 deletions(-)
diff --git a/src/shared/gatt-db.c b/src/shared/gatt-db.c
index fe05595..0c24904 100644
--- a/src/shared/gatt-db.c
+++ b/src/shared/gatt-db.c
@@ -30,6 +30,10 @@
#include "src/shared/timeout.h"
#include "src/shared/gatt-db.h"
+#ifndef MAX
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
#define MAX_CHAR_DECL_VALUE_LEN 19
#define MAX_INCLUDED_VALUE_LEN 6
#define ATTRIBUTE_TIMEOUT 1000
@@ -216,27 +220,26 @@ static bool le_to_uuid(const uint8_t *src, size_t len, bt_uuid_t *uuid)
return true;
}
-struct gatt_db_attribute *gatt_db_add_service(struct gatt_db *db,
- const bt_uuid_t *uuid,
- bool primary,
- uint16_t num_handles)
+static struct gatt_db_service *gatt_db_service_create(const bt_uuid_t *uuid,
+ bool primary,
+ uint16_t num_handles)
{
struct gatt_db_service *service;
const bt_uuid_t *type;
uint8_t value[16];
uint16_t len;
- if (num_handles < 1 || (num_handles + db->next_handle) > UINT16_MAX)
- return 0;
+ if (num_handles < 1)
+ return NULL;
service = new0(struct gatt_db_service, 1);
if (!service)
- return 0;
+ return NULL;
service->attributes = new0(struct gatt_db_attribute *, num_handles);
if (!service->attributes) {
free(service);
- return 0;
+ return NULL;
}
if (primary)
@@ -249,12 +252,29 @@ struct gatt_db_attribute *gatt_db_add_service(struct gatt_db *db,
service->attributes[0] = new_attribute(service, type, value, len);
if (!service->attributes[0]) {
gatt_db_service_destroy(service);
- return 0;
+ return NULL;
}
+ return service;
+}
+
+struct gatt_db_attribute *gatt_db_add_service(struct gatt_db *db,
+ const bt_uuid_t *uuid,
+ bool primary,
+ uint16_t num_handles)
+{
+ struct gatt_db_service *service;
+
+ if (!db || (num_handles + db->next_handle) > UINT16_MAX)
+ return NULL;
+
+ service = gatt_db_service_create(uuid, primary, num_handles);
+ if (!service)
+ return NULL;
+
if (!queue_push_tail(db->services, service)) {
gatt_db_service_destroy(service);
- return 0;
+ return NULL;
}
/* TODO now we get next handle from database. We should first look
@@ -285,6 +305,88 @@ bool gatt_db_remove_service(struct gatt_db *db,
return true;
}
+struct insert_loc_data {
+ struct gatt_db_service *cur;
+ uint16_t start, end;
+ bool fail;
+ bool done;
+};
+
+static void search_for_insert_loc(void *data, void *user_data)
+{
+ struct insert_loc_data *loc_data = user_data;
+ struct gatt_db_service *service = data;
+ uint16_t cur_start, cur_end;
+
+ if (loc_data->done)
+ return;
+
+ cur_start = service->attributes[0]->handle;
+ cur_end = service->attributes[0]->handle + service->num_handles - 1;
+
+ /* Abort if the requested range overlaps with an existing service. */
+ if ((loc_data->start >= cur_start && loc_data->start <= cur_end) ||
+ (loc_data->end >= cur_start && loc_data->end <= cur_end)) {
+ loc_data->fail = true;
+ loc_data->done = true;
+ return;
+ }
+
+ /* Check if this is where the service should be inserted. */
+ if (loc_data->end < cur_start) {
+ loc_data->done = true;
+ return;
+ }
+
+ loc_data->cur = service;
+}
+
+struct gatt_db_attribute *gatt_db_insert_service(struct gatt_db *db,
+ uint16_t handle,
+ const bt_uuid_t *uuid,
+ bool primary,
+ uint16_t num_handles)
+{
+ struct insert_loc_data data;
+ struct gatt_db_service *service;
+
+ if (!db || num_handles < 1 || handle + num_handles > UINT16_MAX)
+ return NULL;
+
+ memset(&data, 0, sizeof(data));
+
+ data.start = handle;
+ data.end = handle + num_handles - 1;
+
+ queue_foreach(db->services, search_for_insert_loc, &data);
+
+ if (data.fail)
+ return NULL;
+
+ service = gatt_db_service_create(uuid, primary, num_handles);
+ if (!service)
+ return NULL;
+
+ if (data.cur) {
+ if (!queue_push_after(db->services, data.cur, service))
+ goto fail;
+ } else if (!queue_push_head(db->services, service)) {
+ goto fail;
+ }
+
+ service->attributes[0]->handle = handle;
+ service->num_handles = num_handles;
+
+ /* Fast-forward next_handle if the new service was added to the end */
+ db->next_handle = MAX(handle + num_handles + 1, db->next_handle);
+
+ return service->attributes[0];
+
+fail:
+ gatt_db_service_destroy(service);
+ return NULL;
+}
+
static uint16_t get_attribute_index(struct gatt_db_service *service,
int end_offset)
{
diff --git a/src/shared/gatt-db.h b/src/shared/gatt-db.h
index c943ad2..c9e3b59 100644
--- a/src/shared/gatt-db.h
+++ b/src/shared/gatt-db.h
@@ -35,6 +35,12 @@ struct gatt_db_attribute *gatt_db_add_service(struct gatt_db *db,
bool gatt_db_remove_service(struct gatt_db *db,
struct gatt_db_attribute *attrib);
+struct gatt_db_attribute *gatt_db_insert_service(struct gatt_db *db,
+ uint16_t handle,
+ const bt_uuid_t *uuid,
+ bool primary,
+ uint16_t num_handles);
+
typedef void (*gatt_db_read_t) (struct gatt_db_attribute *attrib,
unsigned int id, uint16_t offset,
uint8_t opcode, bdaddr_t *bdaddr,
--
2.2.0.rc0.207.ga3a616c
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