// Copyright (C) 2015-2026 The Neo Project.
//
// Unsafe.cs file belongs to the neo project and is free
// software distributed under the MIT software license, see the
// accompanying file LICENSE in the main directory of the
// repository or http://www.opensource.org/licenses/mit-license.php
// for more details.
//
// Redistribution and use in source and binary forms with or without
// modifications are permitted.

using System;
using System.Runtime.CompilerServices;

namespace Neo.VM;

unsafe static class Unsafe
{
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static bool NotZero(ReadOnlySpan<byte> x)
    {
        int len = x.Length;
        if (len == 0) return false;
        fixed (byte* xp = x)
        {
            long* xlp = (long*)xp;
            for (; len >= 8; len -= 8)
            {
                if (*xlp != 0) return true;
                xlp++;
            }
            byte* xbp = (byte*)xlp;
            for (; len > 0; len--)
            {
                if (*xbp != 0) return true;
                xbp++;
            }
        }
        return false;
    }
}
