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#ifndef HYBBX_AX25_H
#define HYBBX_AX25_H
#include "hybbx/types.h"
#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define HYBBX_AX25_CALL_MAX 6
#define HYBBX_AX25_SSID_MAX 15
#define HYBBX_AX25_ADDR_ENCODED 7
#define HYBBX_AX25_MAX_DIGI 8
#define HYBBX_AX25_FRAME_MAX 330
#define HYBBX_AX25_PID_NOL3 0xF0u
#define HYBBX_AX25_CTRL_UI 0x03u
typedef struct hybbx_ax25_address {
char call[HYBBX_AX25_CALL_MAX + 1];
unsigned ssid;
} hybbx_ax25_address_t;
typedef struct hybbx_ax25_path {
hybbx_ax25_address_t dest;
hybbx_ax25_address_t source;
hybbx_ax25_address_t digi[HYBBX_AX25_MAX_DIGI];
unsigned digi_count;
} hybbx_ax25_path_t;
/**
* Parse "CALL" or "CALL-SSID" into @p out.
*/
hybbx_result_t hybbx_ax25_address_parse(const char *text,
hybbx_ax25_address_t *out);
/**
* Encode one AX.25 address field (7 bytes).
* @p last non-zero on the final address field before control byte.
*/
void hybbx_ax25_encode_address(uint8_t *out, const hybbx_ax25_address_t *addr,
int last);
/** CRC-CCITT (0x1021), init 0xFFFF — AX.25 FCS. */
uint16_t hybbx_ax25_crc(const uint8_t *data, size_t len);
/**
* Build an AX.25 UI frame (PID 0xF0) into @p out.
* @return frame length or 0 on error.
*/
size_t hybbx_ax25_build_ui(const hybbx_ax25_path_t *path,
const uint8_t *payload, size_t payload_len,
uint8_t *out, size_t out_cap);
/**
* Parse a UI frame. Returns payload length or 0 if not a UI frame / invalid FCS.
*/
size_t hybbx_ax25_parse_ui(const uint8_t *frame, size_t frame_len,
hybbx_ax25_path_t *path,
uint8_t *payload, size_t payload_cap);
#ifdef __cplusplus
}
#endif
#endif /* HYBBX_AX25_H */
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