The Annoyance Filter.pdf - Fourmilab

§57 ANNOYANCE-FILTER BASE64 MIME DECODER 55
57. The static method decodeEscapedText decodes text in its string argument, returning a string
with escape sequences replaced by the encoded characters. Note that, notwithstanding this being a
static method which can be invoked without reference to a base64MIMEdecoder object, we in fact
actually instantiate such an object within the method, supplying its input from an istringstream
constructed from the argument string.
〈 Class implementations 11 〉 +≡
string base64MIMEdecoder ::decodeEscapedText (const string s, mailFolder ∗m)
{
string r = "";
base64MIMEdecoder dc;
istringstream iss (s);
int dchar ;
}
dc.set(&iss , m, "");
while ((dchar = dc.getDecodedChar ( )) ≥ 0) {
r += static cast〈char〉(dchar );
}
return r;