With this patch long write and nested long write reliable is supported.
GATT server is responsible now to do aggregation of prep write data
for long write session.
Note: We consider long write as the consequtive prepare writes with
continues offsets.
E.g. 1
prep_write: handle 1, offset 0, value_len 10
prep_write: handle 2, offset 0, value_len 10
prep_write: handle 1, offset 10, value_len 10
prep_write: handle 2, offset 10, value_len 10
Will result with following calles to app:
exec_write: handle 1: offset 0, value_len 20
exec_write: handle 2: offset 0, value_len 20
E.g. 2
prep_write: handle 1, offset 0, value_len 10
prep_write: handle 1, offset 2, value_len 5
prep_write: handle 2, offset 0, value_len 10
prep_write: handle 2, offset 4, value_len 5
Will result with following calles to app:
exec_write: handle 1: offset 0, value_len 10
exec_write: handle 1: offset 2, value_len 5
exec_write: handle 2: offset 0, value_len 10
exec_write: handle 2: offset 4, value_len 5
---
src/shared/gatt-server.c | 85 ++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 71 insertions(+), 14 deletions(-)
diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c
index 49dced9..c0e7a08 100644
--- a/src/shared/gatt-server.c
+++ b/src/shared/gatt-server.c
@@ -1088,6 +1088,63 @@ error:
bt_att_send_error_rsp(server->att, opcode, 0, ecode);
}
+static bool match_attribute_handle(const void *data, const void *match_data)
+{
+ const struct prep_write_data *prep_data = data;
+
+ return prep_data->handle == PTR_TO_UINT(match_data);
+}
+
+static bool create_and_store_prep_data(struct bt_gatt_server *server,
+ uint16_t handle, uint16_t offset,
+ uint16_t length, uint8_t *value)
+{
+ struct prep_write_data *prep_data;
+
+ prep_data = new0(struct prep_write_data, 1);
+ prep_data->length = length;
+ if (prep_data->length) {
+ prep_data->value = malloc(prep_data->length);
+ if (!prep_data->value) {
+ return false;
+ }
+
+ memcpy(prep_data->value, value, prep_data->length);
+ }
+
+ prep_data->server = server;
+ prep_data->handle = handle;
+ prep_data->offset = offset;
+
+ queue_push_tail(server->prep_queue, prep_data);
+
+ return true;
+}
+
+static bool make_aggregation_of_long_write_data(struct bt_gatt_server *server,
+ struct prep_write_data *prep_data,
+ uint16_t handle, uint16_t length,
+ uint8_t *value)
+{
+ uint8_t *buf;
+ uint16_t new_len;
+
+ new_len = prep_data->length + length;
+
+ buf = malloc(new_len);
+ if (!buf)
+ return false;
+
+ memcpy(buf, prep_data->value, prep_data->length);
+ memcpy(buf + prep_data->length, value, length);
+
+ free(prep_data->value);
+ prep_data->value = buf;
+ prep_data->length = new_len;
+
+ return true;
+}
+
static void prep_write_cb(uint8_t opcode, const void *pdu,
uint16_t length, void *user_data)
{
@@ -1097,6 +1154,7 @@ static void prep_write_cb(uint8_t opcode, const void *pdu,
uint16_t offset;
struct gatt_db_attribute *attr;
uint8_t ecode;
+ bool success;
if (length < 4) {
ecode = BT_ATT_ERROR_INVALID_PDU;
@@ -1126,22 +1184,21 @@ static void prep_write_cb(uint8_t opcode, const void *pdu,
if (ecode)
goto error;
- prep_data = new0(struct prep_write_data, 1);
- prep_data->length = length - 4;
- if (prep_data->length) {
- prep_data->value = malloc(prep_data->length);
- if (!prep_data->value) {
- ecode = BT_ATT_ERROR_INSUFFICIENT_RESOURCES;
- goto error;
- }
- }
+ prep_data = queue_find(server->prep_queue, match_attribute_handle,
+ UINT_TO_PTR(handle));
- prep_data->server = server;
- prep_data->handle = handle;
- prep_data->offset = offset;
- memcpy(prep_data->value, pdu + 4, prep_data->length);
+ if (prep_data && offset == prep_data->length + prep_data->offset)
+ success = make_aggregation_of_long_write_data(server, prep_data,
+ handle, length - 4,
+ &((uint8_t *) pdu)[4]);
+ else
+ success = create_and_store_prep_data(server, handle, offset,
+ length - 4, &((uint8_t *) pdu)[4]);
- queue_push_tail(server->prep_queue, prep_data);
+ if (!success) {
+ ecode = BT_ATT_ERROR_INSUFFICIENT_RESOURCES;
+ goto error;
+ }
bt_att_send(server->att, BT_ATT_OP_PREP_WRITE_RSP, pdu, length, NULL,
NULL, NULL);
--
2.5.0
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