receiver.h

/**
 * @file receiver.h
 * @brief   This header contains all the structures and functions definitions that ae going to be used by the receiver.c 
 */

#ifndef __RECEIVER_UTILS_
#define __RECEIVER_UTILS_

/* We are using 8 bits to encode the seqnum therefore to fight redondance our window is of 2**(8)/2 */
#define RECV_MAX_SLCTV_RPT_WDW 31
#define TWO_EXP_EIGHT 256

/* Represent the receiver's connection state */
typedef struct __attribute__((__packed__))
{
    uint8_t curr_recv_window;
    uint8_t recv_window_start;        
    uint8_t last_received_in_order;
    pkt_t * recvd_buf[TWO_EXP_EIGHT]; 
    pkt_t * ack_to_send;
    pkt_t * nack_to_send[RECV_MAX_SLCTV_RPT_WDW];
} con_state_t;


/**
 * Loop reading on socket and printing to the stdout
 * @sfd : The socket file descriptor. It is both bound and connected.
 * @return: as soon as the whole transfer is done.
 */
void receiver_read_write_loop(int sfd);

/**
 * Creates and initialize a con_state_t structure
 * @return: a valid pointer upon success, else NULL
 */
con_state_t * state_new();


/**
 * Deletes the con_state_t structure pointed by the
 * state argument.
 * @state: the state to delete.
 * @return: / 
 */
void state_del(con_state_t * state);
#endif