The Annoyance Filter.pdf - Fourmilab

96 FLASH TEXT EXTRACTOR ANNOYANCE-FILTER §117
117. The DefineFont tag actually contains only one thing of interest to us: the number of glyphs in
the font. We save the glyph count in the fontFlyphCount map, tagged by the font ID.
〈 Parse Flash DefineFont tag 117 〉 ≡
{
#ifdef FLASH_PARSE_DEBUG
cout ≪ "DefineFont" ≪ endl ;
#endif
unsigned short fontID = get16 ( );
unsigned int offsetTable = get16 ( );
#ifdef FLASH_PARSE_DEBUG
cout ≪ "␣␣Font␣ID:␣" ≪ fontID ≪ endl ;
cout ≪ "␣␣Glyph␣count:␣" ≪ (offsetTable /2) ≪ endl ;
#endif
fontGlyphCount .insert (make pair (fontID , offsetTable /2));
ignoreTag (2 ∗ 2);
}
This code is used in section 115.
118. The DefineFont2 tag adds a font name to the fields in the original DefineFont tag. We consider
this font name as an eligible string if the textOnly constraint isn’t true .
〈 Parse Flash DefineFont2 tag 118 〉 ≡
{
#ifdef FLASH_PARSE_DEBUG
cout ≪ "DefineFont2" ≪ endl ;
#endif
}
unsigned short fontID = get16 ( );
get16 ( ); /∗ Flag bits ∗/ /∗ Parse the font name ∗/
unsigned int fontNameLen = get8 ( );
string fontName ;
getString (fontName , fontNameLen );
if (¬textOnly ) {
strings .push (fontName );
} /∗ Get the number of glyphs. ∗/
unsigned int nGlyphs = get16 ( );
fontGlyphCount .insert (make pair (fontID , nGlyphs ));
ignoreTag (2 + 2 + 1 + fontNameLen + 2);
This code is used in section 115.