/// <summary>
/// This sets the content type value in the registry for a given file
/// extension
/// </summary>
/// <param name="fileExtension">the file extension (i.e. '.gif')</param>
/// <param name="contentType">the content type (i.e. 'image/gif')</param>
public static void SetContentType(string fileExtension, string contentType)
{
// try to read the registry, throw mimehelper exception if it fails
try
{
RegistryKey extKey = Registry.ClassesRoot.CreateSubKey(fileExtension);
Debug.Assert(extKey != null, "Content Type Not Set");
using (extKey)
{
extKey.SetValue(CONTENT_TYPE_KEY, contentType);
}
}
catch (Exception e)
{
throw MimeHelperException.ForUnableToSetContentType(contentType, e);
}
}
/// <summary>
/// Returns the quoted printable character type for a given chacacter
/// </summary>
/// <param name="ascii">the character to determine type</param>
/// <returns>the character type</returns>
private static int GetQpCharType(int ascii)
{
// legal ascii-
if ((ascii >= 33 && ascii <= 60) ||
(ascii >= 62 && ascii <= 126) ||
(ascii == 0))
{
return(LEGAL_ASCII);
}
// tab or space
else if (ascii == 9 || ascii == 32)
{
return(WHITESPACE);
}
// lineFeed
else if (ascii == 10)
{
return(LINEFEED);
}
// carriage Return
else if (ascii == 13)
{
return(CARRIAGE_RETURN);
}
// high or low illegal ascii value
else if ((ascii < 255 && ascii > 126) || (ascii > 0 && ascii < 33) || (ascii == 61))
{
return(ILLEGAL_ASCII);
}
// ascii value that is unsupportable by this encoding
else
{
// Throw illegal character exception
throw MimeHelperException.ForIllegalEncodingCharacter((char)ascii, "quoted-printable", null);
}
}
