The Annoyance Filter.pdf - Fourmilab

94 FLASH TEXT EXTRACTOR ANNOYANCE-FILTER §115
115. Return the next string (which may contain any number of tokens) from the Flash file. If the
strings queue contains already-parsed strings, return and delete the the item at the head of the queue.
Otherwise, we parse our way through the Flash file, adding any strings which appear in tags to the
strings queue. If, after parsing a tag, we find strings non-empty, we return the first item in the queue.
The method returns true if a string was stored and false when the end of the Flash file is encountered.
The first time this method is called, we read the Flash file header and validate it. If an error occurs
in the process, we treat the event as a logical end of file.
〈 Class implementations 11 〉 +≡
bool flashTextExtractor ::nextString (string &s)
{
if (¬initialised ) {
initialised = true ;
readHeader ( );
if (¬isOK ( )) {
if (verbose ) {
cerr ≪ "Invalid␣header␣in␣Flash␣application␣file." ≪ endl ;
close ( );
while (¬isEOF ( )) {
get8 ( ); /∗ Discard contents after error ∗/
}
return false ;
}
}
}
while (true ) {
haveStrings :
〈 Check for strings in the queue and return first if queue not empty 116 〉;
while ((¬isEOF ( )) ∧ (¬isError ( )) ∧ nextTag ( )) {
unsigned int variant = 0; /∗ Twiddley-puke variant type for tags ∗/
switch (tType ) {
case stagDefineFont :
〈 Parse Flash DefineFont tag 117 〉;
break;
case stagDefineFont2 :
〈 Parse Flash DefineFont2 tag 118 〉;
break;
case stagDefineFontInfo:
〈 Parse Flash DefineFontInfo tag 119 〉;
break;
case stagDefineText2 : /∗ Like stagDefineText , but colour is RGBA ∗/
variant = 2; /∗ Note fall-through ∗/
case stagDefineText :
〈 Parse Flash DefineText tags 120 〉;
break;
case stagDefineEditText :
〈 Parse Flash DefineEditText tag 122 〉;
break;
case stagFrameLabel :
〈 Parse Flash FrameLabel tag 123 〉;
break;
case stagDoAction :
〈 Parse Flash DoAction tag 124 〉;