The Annoyance Filter.pdf - Fourmilab

64 DECODER PARENT CLASS ANNOYANCE-FILTER §68
virtual void discardLine (void)
{
p = src ⃗ length ( );
}
virtual void reportDecoderDiagnostic(const string s) const;
virtual void reportDecoderDiagnostic(const ostringstream &os ) const;
};
69. Return a character assembled by concatenating the next n bytes in most significant byte to least
significant byte order. If the end of input is encountered, −1 is returned. A multiple byte character
equal to −1 triggers an assertion failure in debug builds.
〈 Class implementations 11 〉 +≡
int MBCSdecoder ::getNextNBytes (const unsigned int n)
{
assert((n ≥ 1) ∧ (n ≤ 4));
}
int v = 0;
for (unsigned int i = 0; i < n; i++) {
int b = getNextEncodedByte ( );
if (b < 0) {
return b;
}
v = (v ≪ 8) | b;
}
assert(v ≠ −1);
return v;
70. If the decoder encounters an error, we usually report it as a parser diagnostic to the parent mail
folder. If there is no such folder (since a decoder can be invoked stand-alone), we report the diagnostic
to standard error if the −−verbose option is specified.
〈 Class implementations 11 〉 +≡
void MBCSdecoder ::reportDecoderDiagnostic(const string s) const
{
if (mf ≠ Λ) {
mf ⃗ reportParserDiagnostic(s);
}
else {
if (verbose ) {
cerr ≪ s ≪ endl ;
}
}
}
void MBCSdecoder ::reportDecoderDiagnostic(const ostringstream &os ) const
{
reportDecoderDiagnostic(os .str ( ));
}