private static void GetFileLength(IntPtr info)
{
NSJSFunctionCallbackInfo arguments = NSJSFunctionCallbackInfo.From(info);
string path = arguments.Length > 0 ? (arguments[0] as NSJSString)?.Value : null;
arguments.SetReturnValue(FileAuxiliary.GetFileLength64(path));
}
private unsafe void OpenFileViewAccessor(string path, Action <IntPtr, long, Action> callback)
{
if (callback == null || !File.Exists(path))
{
response.StatusCode = 404;
return;
}
MemoryMappedFile mmf = null;
MemoryMappedViewAccessor mmva = null;
Action closeMmf = () =>
{
if (mmva != null)
{
mmva.Dispose();
mmva = null;
}
if (mmf != null)
{
mmf.Dispose();
mmf = null;
}
};
bool immediate_shutdown = false;
try
{
mmf = MemoryMappedFile.CreateFromFile(path, FileMode.Open);
long totalcount = FileAuxiliary.GetFileLength64(path);
mmva = mmf.CreateViewAccessor(0, totalcount, MemoryMappedFileAccess.ReadWrite);
SafeHandle handle = mmva.SafeMemoryMappedViewHandle;
if (handle.IsInvalid)
{
immediate_shutdown = true;
response.StatusCode = 503;
}
else
{
callback(handle.DangerousGetHandle(), totalcount, closeMmf);
}
}
catch (Exception)
{
immediate_shutdown = true;
response.StatusCode = 500;
}
if (immediate_shutdown)
{
closeMmf();
}
}
