1 /******************************************************************************
2  *
3  *  Copyright (C) 2014 Google, Inc.
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 #ifndef _PACKET_FRAGMENTER_H_
20 #define _PACKET_FRAGMENTER_H_
21 
22 #include "osi/allocator.h"
23 #include "stack/bt_types.h"
24 #include "hci/hci_layer.h"
25 
26 typedef void (*transmit_finished_cb)(BT_HDR *packet, bool all_fragments_sent);
27 typedef void (*packet_reassembled_cb)(BT_HDR *packet);
28 typedef void (*packet_fragmented_cb)(BT_HDR *packet, bool send_transmit_finished);
29 
30 typedef struct {
31     // Called for every packet fragment.
32     packet_fragmented_cb fragmented;
33 
34     // Called for every completely reassembled packet.
35     packet_reassembled_cb reassembled;
36 
37     // Called when the fragmenter finishes sending all requested fragments,
38     // but the packet has not been entirely sent.
39     transmit_finished_cb transmit_finished;
40 } packet_fragmenter_callbacks_t;
41 
42 typedef struct packet_fragmenter_t {
43     // Initialize the fragmenter, specifying the |result_callbacks|.
44     void (*init)(const packet_fragmenter_callbacks_t *result_callbacks);
45 
46     // Release all resources associated with the fragmenter.
47     void (*cleanup)(void);
48 
49     // Check if Current fragmenter is ongoing
50     BT_HDR *(*fragment_current_packet)(void);
51 
52     // Fragments |packet| if necessary and hands off everything to the fragmented callback.
53     void (*fragment_and_dispatch)(BT_HDR *packet);
54     // If |packet| is a complete packet, forwards to the reassembled callback. Otherwise
55     // holds onto it until all fragments arrive, at which point the reassembled callback is called
56     // with the reassembled data.
57     void (*reassemble_and_dispatch)(BT_HDR *packet);
58 } packet_fragmenter_t;
59 
60 const packet_fragmenter_t *packet_fragmenter_get_interface(void);
61 
62 #endif /* _PACKET_FRAGMENTER_H_ */
63