format_utils.c

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/* (C) András Wiesner, 2020-2022 */
 
#include "format_utils.h"
#include <stdint.h>
 
#define LOG_INTERVAL_LOOKUP_OFFSET (6) 
 
static uint16_t sLogIntervalMs[] = { 15, 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000, 0 }; // terminating zero as last element
 
// log interval to milliseconds
uint16_t ptp_logi2ms(int8_t logi) {
    return sLogIntervalMs[logi + LOG_INTERVAL_LOOKUP_OFFSET];
}
 
// milliseconds to log interval
int8_t ptp_ms2logi(uint16_t ms) {
    uint16_t * pIter = sLogIntervalMs;
    while (*pIter != 0) {
        if (*pIter == ms) {
            break;
        }
    }
    return (int8_t)(pIter - sLogIntervalMs) + LOG_INTERVAL_LOOKUP_OFFSET;
}
 
// Network->Host byte order conversion for 64-bit values
uint64_t FLEXPTP_ntohll(uint64_t in) {
    unsigned char out[8] = { in >> 56, in >> 48, in >> 40, in >> 32, in >> 24, in >> 16, in >> 8, in };
    return *(uint64_t*) out;
}
 
uint64_t FLEXPTP_htonll(uint64_t in) {
    return FLEXPTP_ntohll(in);
}