UTF8Marshaler.cs

Go to the documentation of this file.

using System.Runtime.InteropServices;
using System.Text;
 
namespace System.StubHelpers;
 
internal static class UTF8Marshaler
{
    internal unsafe static IntPtr ConvertToNative(int flags, string strManaged, IntPtr pNativeBuffer)
    {
        if (strManaged == null)
        {
            return IntPtr.Zero;
        }
        byte* ptr = (byte*)(void*)pNativeBuffer;
        int cbNativeBuffer;
        if (ptr != null)
        {
            cbNativeBuffer = (strManaged.Length + 1) * 3;
            cbNativeBuffer = strManaged.GetBytesFromEncoding(ptr, cbNativeBuffer, Encoding.UTF8);
        }
        else
        {
            cbNativeBuffer = Encoding.UTF8.GetByteCount(strManaged);
            ptr = (byte*)(void*)Marshal.AllocCoTaskMem(cbNativeBuffer + 1);
            strManaged.GetBytesFromEncoding(ptr, cbNativeBuffer, Encoding.UTF8);
        }
        ptr[cbNativeBuffer] = 0;
        return (IntPtr)ptr;
    }
 
    internal unsafe static string ConvertToManaged(IntPtr cstr)
    {
        if (IntPtr.Zero == cstr)
        {
            return null;
        }
        byte* ptr = (byte*)(void*)cstr;
        int byteLength = string.strlen(ptr);
        return string.CreateStringFromEncoding(ptr, byteLength, Encoding.UTF8);
    }
 
    internal static void ClearNative(IntPtr pNative)
    {
        Marshal.FreeCoTaskMem(pNative);
    }
}