public static string Encode(string InValue, MimeHeaderLineTraits InHdrTraits)
{
QuotedPrintableTraits qpTraits =
CalcQuotedPrintableTraits(InHdrTraits);
string ec = QuotedPrintable.Encode(InValue, qpTraits);
string results = "=?" + InHdrTraits.EncoderCharSet + "?Q?" + ec + "?=";
return(results);
}
// -------------------------- EncodeAsRequired ------------------------------
// encode the string if "RequiresEncoding". Otherwise, return the input string
// as is.
public static string EncodeAsRequired(
string InValue, QuotedPrintableTraits InTraits)
{
if (QuotedPrintable.RequiresEncoding(InValue, InTraits) == true)
{
StringBuilder sb = new StringBuilder(InValue.Length * 2);
sb.Append("=?" + InTraits.CharSet + "?Q?");
sb.Append(QuotedPrintable.Encode(InValue, InTraits));
sb.Append("?=");
return(sb.ToString( ));
}
else
{
return(InValue);
}
}
/// <summary>
/// Crack the component parts of the encoded-word string starting at InBx
/// in the string. Return an object pair. pair.a is a bool set to false if the
/// encoded-word string is not correctly formed. pair.b is a MimeEncodedWord object
/// containing the component parts of the cracked word.
/// </summary>
/// <param name="InString"></param>
/// <param name="InBx"></param>
/// <returns></returns>
public static BoolObjectPair CrackEncodedWord(string InString, int InBx)
{
int Fx, Ix, Lx, RemLx;
string ws = null;
MimeEncodedWord ew = new MimeEncodedWord( );
bool isEncodedWord = true;
try
{
// isolate the next 80 chars from the string as a workspace ( encoded words are
// limited to 75 chars or less )
ew.Bx = InBx;
ws = AcCommon.PullString(InString, InBx, 80, null).ToLower( );
Ix = 0;
// isolate the charset name
Ix = 2;
if (isEncodedWord == true)
{
RemLx = ws.Length - Ix;
if (RemLx <= 3)
{
isEncodedWord = false;
}
else
{
Fx = ws.IndexOf("?q?", Ix);
if (Fx == -1)
{
isEncodedWord = false;
}
else
{
Lx = Fx - Ix;
ew.CharSet = InString.Substring(InBx + Ix, Lx);
Ix = Fx + 3;
}
}
}
// quoted-printable encoded text runs until "?="
if (isEncodedWord == true)
{
RemLx = ws.Length - Ix;
if (RemLx <= 2)
{
isEncodedWord = false;
}
else
{
Fx = ws.IndexOf("?=", Ix);
if (Fx == -1)
{
isEncodedWord = false;
}
else
{
Lx = Fx - Ix;
string qpEncoded = InString.Substring(InBx + Ix, Lx);
ew.DecodedValue = QuotedPrintable.DecodeString(qpEncoded);
ew.Lx = Fx + 2;
}
}
}
}
catch (Exception)
{
isEncodedWord = false;
}
return(new BoolObjectPair(isEncodedWord, ew));
}