/// <summary>
/// Decodes a byte array into another byte array based upon the Content Transfer encoding
/// </summary>
/// <param name="messageBody">The byte array to decode into another byte array</param>
/// <param name="contentTransferEncoding">The <see cref="ContentTransferEncoding"/> of the byte array</param>
/// <returns>A byte array which comes from the <paramref name="contentTransferEncoding"/> being used on the <paramref name="messageBody"/></returns>
/// <exception cref="ArgumentNullException">If <paramref name="messageBody"/> is <see langword="null"/></exception>
/// <exception cref="ArgumentOutOfRangeException">Thrown if the <paramref name="contentTransferEncoding"/> is unsupported</exception>
private static byte[] DecodeBody(byte[] messageBody, ContentTransferEncoding contentTransferEncoding)
{
if (messageBody == null)
{
throw new ArgumentNullException("messageBody");
}
switch (contentTransferEncoding)
{
case ContentTransferEncoding.QuotedPrintable:
// If encoded in QuotedPrintable, everything in the body is in US-ASCII
return(QuotedPrintable.DecodeContentTransferEncoding(Encoding.ASCII.GetString(messageBody)));
case ContentTransferEncoding.Base64:
// If encoded in Base64, everything in the body is in US-ASCII
return(Base64.Decode(Encoding.ASCII.GetString(messageBody)));
case ContentTransferEncoding.SevenBit:
case ContentTransferEncoding.Binary:
case ContentTransferEncoding.EightBit:
// We do not have to do anything
return(messageBody);
default:
throw new ArgumentOutOfRangeException("contentTransferEncoding");
}
}
public void TestUnderscoresNotConvertedToSpacesInContentTransferEncoding()
{
const string input = "a_b_c_d_e_f";
const string expectedOutput = "a_b_c_d_e_f";
string output = Encoding.ASCII.GetString(QuotedPrintable.DecodeContentTransferEncoding(input));
Assert.AreEqual(expectedOutput, output);
}
