using System;
using System.Globalization;
using System.Numerics;

namespace ln.crypto.ec
{
    public static class Extensions
    {

        public static T[] Segment<T>(this T[] a,int start) => Segment(a, start, a.Length);
        public static T[] Segment<T>(this T[] a,int start, int length)
        {
            T[] r = new T[length];
            Array.Copy(a, start, r, 0, length > a.Length ? a.Length : length);
            return r;
        }

        public static byte[] GetBytes(this uint[] a)
        {
            byte[] r = new byte[a.Length * 4];
            for (int n=0;n<a.Length;n++)
                Array.Copy(BitConverter.GetBytes(a[n]),0,r,(n*4),4);
            return r;
        }
        public static byte[] GetBytes(this int[] a)
        {
            byte[] r = new byte[a.Length * 4];
            for (int n=0;n<a.Length;n++)
                Array.Copy(BitConverter.GetBytes(a[n]),0,r,(n*4),4);
            return r;
        }

        public static T[] Reverse<T>(T[] a)
        {
            T[] r = (T[])a.Clone();
            Array.Reverse(r);
            return r;
        }

        public static int CreateHashCode(this byte[] bytes)
        {
            int hash = 0x22447799;
            foreach (byte by in bytes)
                hash *= by;
            return hash;
        }

    }
}