PeerStreamer

int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod){

    int64_t c= (a-b) & (mod-1);

    if(c > (mod>>1))

        c-= mod;

    return c;

}

/**

 * Compare 2 integers modulo mod.

 * That is we compare integers a and b for which only the least significant log2(mod) bits are known

 * @param mod must be a power of 2

 * @returns a negative value if a is smaller than b

 *          a positiv  value if a is greater than b

 *          0                if a equals          b

 */

int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod);