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// client
#include<stdint.h>
#include<stdlib.h>
int zaprus_init(void);
int zaprus_deinit(void);
int zaprus_send_relay(const char* payload, size_t len, char dest[4]);
int zaprus_send_initial_connection(const char* payload, size_t len, uint16_t initial_port);
struct SaprusMessage* zaprus_connect(const char* payload, size_t len);
// message
#define SAPRUS_RELAY_MESSAGE_TYPE 0x003C
#define SAPRUS_FILE_TRANSFER_MESSAGE_TYPE 0x8888
#define SAPRUS_CONNECTION_MESSAGE_TYPE 0x00E9
struct SaprusMessage {
uint16_t packet_type;
uint16_t payload_len;
union {
struct {
struct {
char dest[4];
};
} relay;
struct {
struct {
uint16_t src_port;
uint16_t dest_port;
uint32_t seq_num;
uint32_t msg_id;
char _reserved;
char options;
};
} connection;
} headers;
char *payload;
};
// ptr should be freed by the caller.
int zaprus_message_to_bytes(struct SaprusMessage msg, char** ptr, size_t* len);
// Return value should be destroyed with zaprus_message_deinit.
struct SaprusMessage* zaprus_message_from_bytes(const char* bytes, size_t len);
void zaprus_message_deinit(struct SaprusMessage* msg);
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