using System.Runtime.InteropServices;

namespace T4
{
    public class NativeBuffer : IDisposable
    {
        private IntPtr hglobal;
        private bool disposed = false;
        public IntPtr Handle { get { return hglobal; } }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposed) return;
            if (disposing)
            {
                try
                {
                    if (hglobal != IntPtr.Zero)
                        Marshal.FreeHGlobal(hglobal);
                }
                catch
                {
                }
            }
            //here clean uncontrol
            disposed = true;
        }

        ~NativeBuffer()
        {
            Dispose(false);
        }

        public bool AllocHGlobal(int cb)
        {
            try
            {
                if (hglobal == IntPtr.Zero)
                    hglobal = Marshal.AllocHGlobal(cb);
                return true;
            }
            catch
            {
                return false;
            }
        }

        public bool FreeHGlobal()
        {
            try
            {
                if (hglobal != IntPtr.Zero)
                    Marshal.FreeHGlobal(hglobal);
                return true;
            }
            catch
            {
                return false;
            }
        }

        public bool IsAllocked()
        {
            return hglobal != IntPtr.Zero;
        }
    }
}