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PODecoding 8bit mail message: Content-Transfer-Encoding: 8bit
 

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    <p>I'm developing an email viewer which one reads .eml files and displays the message in a browser control. I've found code snippet and it can display 7bit and quoted-printable messages (Content-Transfer-Encoding: quoted-printable / Content-Transfer-Encoding: base64). <strong>What I need is decoding 8bit messages.</strong></p> <pre><code> private static AlternateView ImportText(StringReader r, string encoding, System.Net.Mime.ContentType contentType) { string line = string.Empty; StringBuilder b = new StringBuilder(); while ((line = r.ReadLine())!= null) { switch (encoding) { case "quoted-printable": if (line.EndsWith("=")) { b.Append(DecodeQuotedPrintables(line.TrimEnd('='), contentType.CharSet)); } else { b.Append(DecodeQuotedPrintables(line, contentType.CharSet) + "\n"); } break; case "base64": b.Append(DecodeBase64(line, contentType.CharSet)); break; case "8bit": // I need an 8bit decoder here!!! b.Append(IneedAn8bitDecoderHere(line, contentType.CharSet)); break; default: b.Append(line); break; } } AlternateView returnValue = AlternateView.CreateAlternateViewFromString(b.ToString(), null, contentType.MediaType); returnValue.TransferEncoding = TransferEncoding.QuotedPrintable; return returnValue; } </code></pre> <p>I googled for an 8bit decoder but couldn't find any. Do I really need an 8bit decoder here and do you know a good working one?</p> <p><strong>UPDATE:</strong></p> <p><strong>Related headers:</strong></p> <pre><code> MIME-Version: 1.0 Content-Type: text/plain; charset="koi8-r"; Content-Transfer-Encoding: 8bit </code></pre> <p><strong>Body message in my code (string line):</strong></p> <pre><code> ����������� �� ����, � ����� ��� � ������ ��������� ������� � �������� �������� �� ������� </code></pre> <p><strong>What Outlook displays in real world:</strong></p> <pre><code> Фантастично но факт, я снова как и раньше сделалась статной и красивой примерно за месяцок </code></pre> <p>I think I don't need <strong>case "8bit":</strong> part. As SLaks mentioned, I need to load mail source into byte array instead of string at the very beginning of the process. Examining the <strong>charset=</strong> in mail header from byte array will give the appropriate code page.</p>
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    1. COOnce you've read it into a string, it's too late. You need to use the appropriate `Encoding` to decode it from bytes.
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    2. COFrom [Exchange Server 2003: Content-Transfer-Encoding: 8bit](http://msdn.microsoft.com/en-us/library/ms526992(v=exchg.10).aspx) 8bit encoding has the same line-length limitations as the 7bit encoding. It allows 8bit characters. No encoding or decoding is required for 8bit files. Since not all MTAs can handle 8bit data, the 8bit encoding is not a valid encoding mechanism for Internet mail.
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    3. COThat's talking about binary attachments which aren't strings at all.
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