servuo/Server/NativeReader.cs

#region References
using System;
using System.Runtime.InteropServices;
using System.Threading;
#endregion

namespace Server
{
    public static class NativeReader
    {
        private static readonly INativeReader m_NativeReader;

        static NativeReader()
        {
            if (Core.Unix)
            {
                m_NativeReader = new NativeReaderUnix();
            }
            else
            {
                m_NativeReader = new NativeReaderWin32();
            }
        }

        public static unsafe void Read(IntPtr ptr, void* buffer, int length)
        {
            m_NativeReader.Read(ptr, buffer, length);
        }
    }

    public interface INativeReader
    {
        unsafe void Read(IntPtr ptr, void* buffer, int length);
    }

    public sealed class NativeReaderWin32 : INativeReader
    {
        internal class UnsafeNativeMethods
        {
            /*[DllImport("kernel32")]
			internal unsafe static extern int _lread(IntPtr hFile, void* lpBuffer, int wBytes);*/

            [DllImport("kernel32")]
            internal static extern unsafe bool ReadFile(
                IntPtr hFile,
                void* lpBuffer,
                uint nNumberOfBytesToRead,
                ref uint lpNumberOfBytesRead,
                NativeOverlapped* lpOverlapped);
        }

        public unsafe void Read(IntPtr ptr, void* buffer, int length)
        {
            //UnsafeNativeMethods._lread( ptr, buffer, length );
            uint lpNumberOfBytesRead = 0;
            UnsafeNativeMethods.ReadFile(ptr, buffer, (uint)length, ref lpNumberOfBytesRead, null);
        }
    }

    public sealed class NativeReaderUnix : INativeReader
    {
        internal class UnsafeNativeMethods
        {
            [DllImport("libc")]
            internal static extern unsafe int read(IntPtr ptr, void* buffer, int length);
        }

        public unsafe void Read(IntPtr ptr, void* buffer, int length)
        {
            UnsafeNativeMethods.read(ptr, buffer, length);
        }
    }
}