Bumblebee.IntegrationTests.Setup.SessionTests.Given_session_with_default_settings.GetMimeFromFile C# (CSharp) Method

		private static string GetMimeFromFile(string filename)
		{
			if (File.Exists(filename) == false)
			{
				throw new FileNotFoundException(String.Format("File '{0}' not found", filename));
			}

			int numberOfBytesRead;
			byte[] buffer = new byte[256];

			using (var fs = new FileStream(filename, FileMode.Open))
			{
				var length = (int) Math.Min(256, fs.Length);

				numberOfBytesRead = fs.Read(buffer, 0, length);
			}

			string result;

			try
			{
				IntPtr mimetype;

				FindMimeFromData(IntPtr.Zero, null, buffer, numberOfBytesRead, null, 0, out mimetype, 0);

				result = Marshal.PtrToStringUni(mimetype);

				Marshal.FreeCoTaskMem(mimetype);
			}
			catch (Exception e)
			{
				throw new ApplicationException(String.Format("Unable to determine type of file '{0}'.", filename), e);
			}

			return result;
		}