frag.h

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#ifndef FRAG_H
#define FRAG_H
 
#include <stddef.h>
#include <time.h>
 
#define MAX_FRAGMENT_ENTRIES 65536
 
// Forward declarations
typedef struct he_conn he_conn_t;
typedef struct he_fragment_entry_node he_fragment_entry_node_t;
 
// Information of a fragment
typedef struct he_fragment_entry_node {
  uint16_t begin;
  uint16_t end;
  bool last_frag;
  he_fragment_entry_node_t *next;
} he_fragment_entry_node_t;
 
// An entry of the fragment table
typedef struct he_fragment_entry {
  uint8_t data[HE_MAX_WIRE_MTU];
  time_t timestamp;
  // Linked list contains infomation of received fragments
  he_fragment_entry_node_t *fragments;
} he_fragment_entry_t;
 
// Fragment table for reassembling fragments
typedef struct he_fragment_table {
  he_fragment_entry_t **entries;
  size_t num_entries;
} he_fragment_table_t;
 
he_return_code_t he_internal_frag_and_send_message(he_conn_t *conn, uint8_t *packet,
                                                   uint16_t length, uint16_t frag_size);
 
void he_fragment_entry_reset(he_fragment_entry_t *entry);
 
int he_fragment_entry_update(he_fragment_entry_t *entry, uint8_t *data, uint16_t offset,
                             size_t length, uint8_t mf, bool *assembled);
 
he_fragment_table_t *he_internal_fragment_table_create(size_t num_entries);
 
he_fragment_entry_t *he_internal_fragment_table_find(he_fragment_table_t *tbl, uint16_t frag_id);
 
void he_internal_fragment_table_delete(he_fragment_table_t *tbl, uint16_t frag_id);
 
void he_internal_fragment_table_destroy(he_fragment_table_t *tbl);
 
#endif  // FRAG_H