/// <summary>
///
/// </summary>
/// <param name="bytes"></param>
/// <param name="id"></param>
/// <returns></returns>
private static byte[] GetObject(byte[] bytes, string id)
{
using (var stream = new MemoryStream(bytes))
{
var contents = new StreamContent(stream)
{
Headers =
{
ContentType = MediaTypeHeaderValue.Parse(GetBoundary(bytes).Insert(0, "multipart/related; "))
}
}.ReadAsMultipartAsync(new MultipartRelatedStreamProvider()).Result.Contents;
foreach (var type in contents.Select(t => t.Headers.ContentType).Where(t => t.CharSet != null))
{
type.CharSet = type.CharSet.Replace("\"", "");
}
HttpContent content;
if (string.IsNullOrEmpty(id))
{
content = contents.FirstOrDefault(t => !t.Headers.Contains("Content-ID"));
}
else
{
content = contents.FirstOrDefault(t =>
{
IEnumerable <string> values;
if (t.Headers.TryGetValues("Content-ID", out values))
{
return(values.Contains(id));
}
return(false);
});
}
if (content == null)
{
return(null);
}
bytes = content.ReadAsByteArrayAsync().Result;
switch (content.Headers.GetValues("Content-Transfer-Encoding").FirstOrDefault())
{
case "base64":
{
bytes = Convert.FromBase64String(Encoding.ASCII.GetString(bytes));
break;
}
case "quoted-printable":
{
var instance = typeof(TransferEncoding).Assembly.CreateInstance(
"System.Net.Mime.QuotedPrintableStream",
false,
BindingFlags.Instance | BindingFlags.NonPublic,
null,
new object[] { stream, true },
null,
null);
if (instance == null)
{
throw new FormatException("Quoted printable instance was not created.");
}
var methodInfo = instance.GetType().GetMethod("DecodeBytes");
if (methodInfo != null)
{
bytes.Resize((int)methodInfo.Invoke(instance, new object[] { bytes, 0, bytes.Length }));
}
break;
}
default:
{
throw new FormatException("Transfer encoding was unexpected.");
}
}
var charset = content.Headers.ContentType.CharSet;
if (string.IsNullOrEmpty(charset))
{
return(bytes);
}
var encoding = Encoding.GetEncoding(charset);
if (encoding.CodePage == Encoding.UTF8.CodePage)
{
return(bytes);
}
return(Encoding.Convert(encoding, Encoding.UTF8, bytes));
}
}
