text: /******************************************************************************
   *
   *  Copyright (C) 2014 Google, Inc.
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at:
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   ******************************************************************************/
  
  #ifndef _PACKET_FRAGMENTER_H_
  #define _PACKET_FRAGMENTER_H_
  
  #include "osi/allocator.h"
  #include "stack/bt_types.h"
  #include "hci/hci_layer.h"
  
  typedef void (*transmit_finished_cb)(BT_HDR *packet, bool all_fragments_sent);
  typedef void (*packet_reassembled_cb)(BT_HDR *packet);
  typedef void (*packet_fragmented_cb)(BT_HDR *packet, bool send_transmit_finished);
  
  typedef struct {
      // Called for every packet fragment.
      packet_fragmented_cb fragmented;
  
      // Called for every completely reassembled packet.
      packet_reassembled_cb reassembled;
  
      // Called when the fragmenter finishes sending all requested fragments,
      // but the packet has not been entirely sent.
      transmit_finished_cb transmit_finished;
  } packet_fragmenter_callbacks_t;
  
  typedef struct packet_fragmenter_t {
      // Initialize the fragmenter, specifying the |result_callbacks|.
      void (*init)(const packet_fragmenter_callbacks_t *result_callbacks);
  
      // Release all resources associated with the fragmenter.
      void (*cleanup)(void);
  
      // Check if Current fragmenter is ongoing
      BT_HDR *(*fragment_current_packet)(void);
  
      // Fragments |packet| if necessary and hands off everything to the fragmented callback.
      void (*fragment_and_dispatch)(BT_HDR *packet);
      // If |packet| is a complete packet, forwards to the reassembled callback. Otherwise
      // holds onto it until all fragments arrive, at which point the reassembled callback is called
      // with the reassembled data.
      void (*reassemble_and_dispatch)(BT_HDR *packet);
  } packet_fragmenter_t;
  
  const packet_fragmenter_t *packet_fragmenter_get_interface();
  
  #endif /* _PACKET_FRAGMENTER_H_ */
  