using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;

namespace Ips.Library.Basic
{
    public static class BinaryUitl
    {
        public static byte[] StructToBytes<T>(T obj) where T : struct
        {
            int size = Marshal.SizeOf(obj);
            IntPtr ptr = Marshal.AllocHGlobal(size);
            byte[] buf = new byte[size];
            try
            {
                Marshal.StructureToPtr(obj, ptr, false);
                Marshal.Copy(ptr, buf, 0, buf.Length);
            }
            finally
            {
                Marshal.FreeHGlobal(ptr);
            }
            return buf;
        }

        public static T BytesToStruct<T>(byte[] buf, int startIndex = 0) where T : struct
        {
            int size = Marshal.SizeOf<T>();
            IntPtr ptr = Marshal.AllocHGlobal(size);
            T result;
            try
            {
                Marshal.Copy(buf, startIndex, ptr, size);
                result = Marshal.PtrToStructure<T>(ptr);
            }
            finally
            {
                Marshal.FreeHGlobal(ptr);
            }
            return result;
        }
    }
}