/**
* @brief sends next data block during TFTP READ operation
* @param upcb: pointer on a udp pcb
* @param args: pointer on structure of type tftp_connection_args
* @param to_ip: pointer on remote IP address
* @param to_port: pointer on remote udp port
* @retval None
*/
void tftp_send_next_block(struct udp_pcb *upcb, tftp_connection_args *args,
struct ip_addr *to_ip, u16_t to_port)
{
/* Function to read 512 bytes from the file to send (file_SD), put them
* in "args->data" and return the number of bytes read */
f_read(&file_SD, (uint8_t*)args->data, TFTP_DATA_LEN_MAX, (UINT*)(&args->data_len));
/* NOTE: We need to send data packet even if args->data_len = 0*/
/* sEndTransferthe data */
tftp_send_data_packet(upcb, to_ip, to_port, args->block, args->data, args->data_len);
}
void tftp_send_next_block(struct udp_pcb *upcb, tftp_connection_args *args,
struct ip_addr *to_ip, u16_t to_port)
{
/* Function to read 512 bytes from the file to sEndTransfer(file_SD), put them
* in "args->data" and return the number of bytes read */
args->data_len = file_read(&file_SD, TFTP_DATA_LEN_MAX, (euint8*)args->data);
/* NOTE: We need to sEndTransferanother data packet even if args->data_len = 0
The reason for this is as follows:
1) This function is only ever called if the previous packet payload was
512 bytes.
2) If args->data_len = 0 then that means the file being sent is an exact
multiple of 512 bytes.
3) RFC1350 specifically states that only a payload of <= 511 can EndTransfera
transfer.
4) Therefore, we must sEndTransferanother data message of length 0 to complete
the transfer. */
/* sEndTransferthe data */
tftp_send_data_packet(upcb, to_ip, to_port, args->block, args->data, args->data_len);
}
