#ifndef _TCP_REASSEMBLY_H
#define _TCP_REASSEMBLY_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include <stdint.h>

#include "log.h"

#define TCP_REASSEMBLY_LOG_DEBUG(format, ...) LOG_DEBUG("tcp_reassembly", format, ##__VA_ARGS__)
#define TCP_REASSEMBLY_LOG_ERROR(format, ...) LOG_ERROR("tcp_reassembly", format, ##__VA_ARGS__)

struct tcp_segment
{
    uint32_t len;
    const void *data;
};

struct tcp_segment *tcp_segment_new(uint32_t seq, const void *data, uint32_t len);
void tcp_segment_free(struct tcp_segment *seg);

struct tcp_reassembly *tcp_reassembly_new(uint64_t max_timeout, uint64_t max_seg_num);
void tcp_reassembly_free(struct tcp_reassembly *assembler);

// return:  1: success (seg overlap)
// return:  0: success
// return: -1: failed (no space)
int tcp_reassembly_push(struct tcp_reassembly *assembler, struct tcp_segment *seg, uint64_t now);
struct tcp_segment *tcp_reassembly_pop(struct tcp_reassembly *assembler);
struct tcp_segment *tcp_reassembly_expire(struct tcp_reassembly *assembler, uint64_t now);

void tcp_reassembly_inc_recv_next(struct tcp_reassembly *assembler, uint32_t offset);
void tcp_reassembly_set_recv_next(struct tcp_reassembly *assembler, uint32_t seq);
uint32_t tcp_reassembly_get_recv_next(struct tcp_reassembly *assembler);

#ifdef __cpluscplus
}
#endif

#endif