Read the raw data from a GDAL VSI file in C#

GdalReadVirtualFile.cs

/// <summary>
/// On various GDAL mailing lists and forums one can find people complaining about the lack of the VSIFReadL
/// function in GDAL's C# bindings, which allows data to be read from a GDAL "virtual file".
///
/// An example is here: https://lists.osgeo.org/pipermail/gdal-dev/2018-July/048838.html
///
/// However it is possible to use .NET Platform Invoke as below to call this function straight from the native
/// GDAL DLL entry point.
/// </summary>
internal static class GdalReadVsiFile
{
    /// <summary>
    ///     This is needed because the GDAL SWIG bindings are missing the required read function.
    /// </summary>
    /// <param name="buffer">A data into which GDAL will read</param>
    /// <param name="memberSize">Size of each member of the buffer (always 1 as we are going by bytes)</param>
    /// <param name="memberCount">Count of members in the buffer</param>
    /// <param name="vsiFile">Pointer to a GDAL VSIFile structure (opaque to this client code)</param>
    /// <returns>(Presumably) the number of bytes read, but we don't care</returns>
    [DllImport(
        @"PATH_TO_GDAL_NATIVE_PACKAGE\gdal.dll",
        CallingConvention = CallingConvention.Cdecl,
        CharSet = CharSet.Unicode,
        SetLastError = true)]
    internal static extern int VSIFReadL(
        [MarshalAs(UnmanagedType.LPArray)] byte[] buffer,
        [MarshalAs(UnmanagedType.U4)] uint memberSize,
        [MarshalAs(UnmanagedType.U4)] uint memberCount,
        IntPtr vsiFile);
}