[Ghitulescu]

First, my situation at the moment.

I had to embed a font in an ePub in order to able able to display some diacritics, which were not in the stock font (of the Sony PRS-T1 if this matters, but try not to link your answer to this, I am not interested in a circumventional solution for T1) with calibre, again if that matters.

After embedding, I used the ePub preview of the calibre and saw no problem.

On all the eReaders I've checked this ePub, a certain unicode punctuation was replaced by the "missing character" glyph, a square in this case.

Now, the book has been heavily edited within calibre, that means the original XHTML files cannot longer be used for recreating the book.

So I am facing two alternatives:
- one is to change the font
- the other one is to export the ePub into a different format then reimport it with a new font

The first solution has the disadvantage of heavily editing (the initial font has been subset) and no control up to the hardware eReader.

The second one seems to destroy my carefully (and long) edited TOC. To which I have again no solution in sight.

Is it a method to replace the embedded font/s that only replaces the font/s, but doesn't alter nothing else (and subsequently also subset them)? And is there any method to check whether the glyphs used have indeed the required corresponding glyphs in the selected font?

I searched the internet, this forum and read the documentation, but couldn't find anything pertinent.

Thanks.