rbc_util_km114_relay.h

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#ifndef RTE_EXAMPLE_RBC_UTIL_KM114_RELAY_H
#define RTE_EXAMPLE_RBC_UTIL_KM114_RELAY_H

 
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
 
#include "rbc_util_frame.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define RBC_UTIL_KM114_RELAY_HEADER_SIZE 4U
#define RBC_UTIL_KM114_RELAY_CHUNK_MAX   (RBC_UTIL_PAYLOAD_MAX - RBC_UTIL_KM114_RELAY_HEADER_SIZE) /* 246 */
#define RBC_UTIL_KM114_RELAY_MAX_FRAGS   2U
#define RBC_UTIL_KM114_RELAY_FILE_MAX    (RBC_UTIL_KM114_RELAY_CHUNK_MAX * RBC_UTIL_KM114_RELAY_MAX_FRAGS) /* 492 */

static inline size_t rbc_util_km114_relay_encode_chunk(uint8_t *out, uint16_t total_len, uint8_t frag_index,
                                                        uint8_t frag_count, const uint8_t *chunk,
                                                        size_t chunk_len)
{
    if (chunk_len > (size_t)RBC_UTIL_KM114_RELAY_CHUNK_MAX)
    {
        return 0U;
    }
    out[0] = (uint8_t)(total_len & 0xFFU);
    out[1] = (uint8_t)((total_len >> 8) & 0xFFU);
    out[2] = frag_index;
    out[3] = frag_count;
    if (chunk_len > 0U)
    {
        (void)memcpy(&out[RBC_UTIL_KM114_RELAY_HEADER_SIZE], chunk, chunk_len);
    }
    return RBC_UTIL_KM114_RELAY_HEADER_SIZE + chunk_len;
}

static inline bool rbc_util_km114_relay_decode_chunk(const uint8_t *payload, uint8_t payload_len,
                                                      uint16_t *out_total_len, uint8_t *out_frag_index,
                                                      uint8_t *out_frag_count, const uint8_t **out_chunk,
                                                      uint8_t *out_chunk_len)
{
    if (payload_len < (uint8_t)RBC_UTIL_KM114_RELAY_HEADER_SIZE)
    {
        return false;
    }
    *out_total_len = (uint16_t)((uint16_t)payload[0] | ((uint16_t)payload[1] << 8));
    *out_frag_index = payload[2];
    *out_frag_count = payload[3];
    *out_chunk = &payload[RBC_UTIL_KM114_RELAY_HEADER_SIZE];
    *out_chunk_len = (uint8_t)(payload_len - (uint8_t)RBC_UTIL_KM114_RELAY_HEADER_SIZE);
    return true;
}
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
#endif /* RTE_EXAMPLE_RBC_UTIL_KM114_RELAY_H */