casbin/ip_parser/parser/CIDRMask.cpp

#include "casbin/pch.h"

#ifndef CIDRMASK_CPP
#define CIDRMASK_CPP

#include "casbin/ip_parser/parser/CIDRMask.h"

namespace casbin {

IPMask CIDRMask(int ones, int bits) {
    IPMask mask;
    if (bits != 8 * IP ::IPv4len && bits != 8 * IP ::IPv6len) {
        return mask;
    }
    if (ones < 0 || ones > bits) {
        return mask;
    }
    int l = bits / 8;
    IPMask newMask(l, 0);
    mask = newMask;
    int n = int(ones);
    for (int i = 0; i < l; i++) {
        if (n >= 8) {
            mask[i] = 0xff;
            n -= 8;
            continue;
        }
        mask[i] = ~char(0xff >> n);
        n = 0;
    }
    return mask;
}

} // namespace casbin

#endif // CIDRMASK_CPP