public static long randomBits()

in harry-core/src/harry/generators/RngUtils.java [145:173]

• 27 lines of code
• 5 McCabe index (conditional complexity)

    public static long randomBits(long bits, long length, LongSupplier rng)
    {
        long mask = bitmask(length);
        if (bits == length)
            return mask;
        long min = 0;
        long max = ~0L;
        int n = 0;
        int steps = 0;
        while (n != bits)
        {
            if (steps > 10_000)
            {
                throw new RuntimeException(String.format("Could not generate bits after 10K tries. " +
                                          "Inputs: bits=%d, length=%d", bits, length));
            }

            long x = rng.getAsLong() & mask;
            x = min | (x & max);
            n = Long.bitCount(x);
            if (n > bits)
                max = x;
            else
                min = x;

            steps++;
        }
        return min;
    }