This patch implements bt_gatt_discover_descriptors.
---
src/shared/gatt-helpers.c | 155 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 153 insertions(+), 2 deletions(-)
diff --git a/src/shared/gatt-helpers.c b/src/shared/gatt-helpers.c
index 283e6d2..d02b212 100644
--- a/src/shared/gatt-helpers.c
+++ b/src/shared/gatt-helpers.c
@@ -691,14 +691,165 @@ bool bt_gatt_discover_characteristics(struct bt_att *att,
return true;
}
+struct discover_descs_op {
+ struct discovery_op data;
+ uint16_t end;
+};
+
+static struct discover_descs_op *discover_descs_op_ref(
+ struct discover_descs_op *op)
+{
+ __sync_fetch_and_add(&op->data.ref_count, 1);
+
+ return op;
+}
+
+static void discover_descs_op_unref(void *data)
+{
+ struct discover_descs_op *op = data;
+
+ if (__sync_sub_and_fetch(&op->data.ref_count, 1))
+ return;
+
+ if (op->data.destroy)
+ op->data.destroy(op->data.user_data);
+
+ list_free(&op->data.results, free);
+
+ free(op);
+}
+
+static void discover_descs_cb(uint8_t opcode, const void *pdu,
+ uint16_t length, void *user_data)
+{
+ struct discover_descs_op *op = user_data;
+ bool success;
+ uint8_t att_ecode = 0;
+ struct bt_gatt_list *results = NULL;
+ uint8_t format;
+ uint16_t last_handle;
+ size_t data_length;
+ int i;
+
+ if (opcode == BT_ATT_OP_ERROR_RSP) {
+ success = false;
+ att_ecode = process_error(pdu, length);
+
+ if (att_ecode == BT_ATT_ERROR_ATTRIBUTE_NOT_FOUND &&
+ !list_isempty(&op->data.results))
+ goto success;
+
+ goto done;
+ }
+
+ /* The PDU should contain the following data (sans opcode):
+ * - Format (1 octet)
+ * - Attr Data List (at least 4 octets):
+ * -- 2 octets: Attribute handle
+ * -- 2 or 16 octets: UUID.
+ */
+ if (opcode != BT_ATT_OP_FIND_INFO_RSP || !pdu || length < 5) {
+ success = false;
+ goto done;
+ }
+
+ format = ((uint8_t *) pdu)[0];
+
+ if (format == 0x01)
+ data_length = 4;
+ else if (format == 0x02)
+ data_length = 18;
+ else {
+ success = false;
+ goto done;
+ }
+
+ if ((length - 1) % data_length) {
+ success = false;
+ goto done;
+ }
+
+ for (i = 1; i < length; i += data_length) {
+ struct bt_gatt_descriptor *descr;
+
+ descr = new0(struct bt_gatt_descriptor, 1);
+ if (!descr) {
+ success = false;
+ goto done;
+ }
+
+ last_handle = get_le16(pdu + i);
+ descr->handle = last_handle;
+ convert_uuid_le(pdu + i + 2, data_length - 2, descr->uuid);
+
+ if (!list_add(&op->data.results, descr)) {
+ success = false;
+ goto done;
+ }
+ }
+
+ if (last_handle != op->end) {
+ uint8_t pdu[4];
+
+ put_le16(last_handle + 1, pdu);
+ put_le16(op->end, pdu + 2);
+
+ if (bt_att_send(op->data.att, BT_ATT_OP_FIND_INFO_REQ,
+ pdu, sizeof(pdu),
+ discover_descs_cb,
+ discover_descs_op_ref(op),
+ discover_descs_op_unref))
+ return;
+
+ discover_descs_op_unref(op);
+ success = false;
+ goto done;
+ }
+
+success:
+ results = op->data.results.head;
+ success = true;
+
+done:
+ if (op->data.callback)
+ op->data.callback(success, att_ecode, results,
+ op->data.user_data);
+}
+
bool bt_gatt_discover_descriptors(struct bt_att *att,
uint16_t start, uint16_t end,
bt_gatt_discovery_callback_t callback,
void *user_data,
bt_gatt_destroy_func_t destroy)
{
- /* TODO */
- return false;
+ struct discover_descs_op *op;
+ uint8_t pdu[4];
+
+ if (!att)
+ return false;
+
+ op = new0(struct discover_descs_op, 1);
+ if (!op)
+ return false;
+
+ op->data.att = att;
+ op->data.callback = callback;
+ op->data.user_data = user_data;
+ op->data.destroy = destroy;
+ op->end = end;
+
+ put_le16(start, pdu);
+ put_le16(end, pdu + 2);
+
+ if (!bt_att_send(att, BT_ATT_OP_FIND_INFO_REQ, pdu, sizeof(pdu),
+ discover_descs_cb,
+ discover_descs_op_ref(op),
+ discover_descs_op_unref)) {
+ free(op);
+ return false;
+ }
+
+ return true;
}
bool bt_gatt_read_value(struct bt_att *att, uint16_t value_handle,
--
2.0.0.526.g5318336
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