public static String EncodeToMailBody(String text, TransferEncoding encodeType, Encoding encoding)
{
Byte[] bb = encoding.GetBytes(text);
if (encodeType == TransferEncoding.Base64)
{
return(Convert.ToBase64String(bb));
}
else if (encodeType == TransferEncoding.QuotedPrintable)
{
return(MailParser.ToQuotedPrintable(encoding.GetString(bb)));
}
return(encoding.GetString(bb));
}
public static String EncodeToMailHeaderLine(String text, TransferEncoding encodeType, Encoding encoding, Int32 maxCharCount)
{
Byte[] bb = null;
StringBuilder sb = new StringBuilder();
Int32 StartIndex = 0;
Int32 CharCountPerRow = 0;
Int32 ByteCount = 0;
if (maxCharCount > MailParser.MaxCharCountPerRow)
{
throw new ArgumentException("maxCharCount must less than MailParser.MaxCharCountPerRow.");
}
if (String.IsNullOrEmpty(text) == true)
{
return("");
}
if (MailParser.AsciiCharOnly(text) == true)
{
StartIndex = 0;
CharCountPerRow = maxCharCount;
for (int i = 0; i < text.Length; i++)
{
sb.Append(text[i]);
if (StartIndex == CharCountPerRow)
{
sb.Append(MailParser.NewLine);
StartIndex = 0;
CharCountPerRow = MailParser.MaxCharCountPerRow;
if (i < text.Length - 1)
{
sb.Append("\t");
}
}
else
{
StartIndex += 1;
}
}
return(sb.ToString());
}
if (encodeType == TransferEncoding.Base64)
{
CharCountPerRow = (Int32)Math.Floor((maxCharCount - (encoding.WebName.Length + 10)) * 0.75);
for (int i = 0; i < text.Length; i++)
{
ByteCount = encoding.GetByteCount(text.Substring(StartIndex, (i + 1) - StartIndex));
if (ByteCount > CharCountPerRow)
{
bb = encoding.GetBytes(text.Substring(StartIndex, i - StartIndex));
sb.AppendFormat("=?{0}?B?{1}?={2}\t", encoding.WebName, Convert.ToBase64String(bb), MailParser.NewLine);
StartIndex = i;
CharCountPerRow = (Int32)Math.Floor((MailParser.MaxCharCountPerRow - (encoding.WebName.Length + 10)) * 0.75);
}
}
bb = encoding.GetBytes(text.Substring(StartIndex));
sb.AppendFormat("=?{0}?B?{1}?=", encoding.WebName, Convert.ToBase64String(bb));
return(sb.ToString());
}
else if (encodeType == TransferEncoding.QuotedPrintable)
{
CharCountPerRow = (Int32)Math.Floor((maxCharCount - (Double)(encoding.WebName.Length + 10)) / 3);
for (int i = 0; i < text.Length; i++)
{
ByteCount = encoding.GetByteCount(text.Substring(StartIndex, (i + 1) - StartIndex));
if (ByteCount > CharCountPerRow)
{
bb = encoding.GetBytes(text.Substring(StartIndex, i - StartIndex));
sb.AppendFormat("=?{0}?Q?{1}?={2}\t", encoding.WebName, MailParser.ToQuotedPrintableOnHeader(Encoding.ASCII.GetString(bb)), MailParser.NewLine);
StartIndex = i;
CharCountPerRow = (Int32)Math.Floor((MailParser.MaxCharCountPerRow - (encoding.WebName.Length + 10)) * 0.75);
}
}
bb = encoding.GetBytes(text.Substring(StartIndex));
sb.AppendFormat("=?{0}?Q?{1}?=", encoding.WebName, MailParser.ToQuotedPrintable(Encoding.ASCII.GetString(bb)));
return(sb.ToString());
}
else
{
return(text);
}
}
