This method reads a table from the font. Note that in general, it only makes sense to call this method on an
LEFontInstance which represents a physical font - i.e. one which has been returned by
getSubFont(). This is because each subfont in a composite font will have different tables, and there's no way to know which subfont to access.
Subclasses which represent composite fonts should always return
|tableTag ||- the four byte table tag. (e.g. 'cmap')|
- the address of the table in memory, or
NULL if the table doesn't exist.
Referenced by LayoutEngine::getFontTable(), and LayoutEngine::layoutEngineFactory().