[ft] Accessing font tables?

[Ian Britten]

Hi all,
I'm in the process of upgrading some v2.1.7 code to the latest
version (2.3.5), and was wondering if someone could point me in
the right direction regarding accessing font tables?

<Background>
The relevant code is bridging ICU and FreeType.  I'm not sure
why ICU wants the font tables (Kerning probably?), but I'm just
trying to get them back to the caller.  See
http://www.icu-project.org/apiref/icu4c/classLEFontInstance.html#af1da7510c05deebcab885b4f351db33
for the C++ baseclass interface I need to implement.

It provides a single input (LETag == uint32_t), and wants a
void* back.  It's called from deep within ICU if/when necessary
</Background>

The original code seems to only support TT tables, and looks
something like this:
        LETag tableTag = // whatever
        TT_Face ttFace =  // whatever
        FT_ULong length = 0;
        FT_Error error = ttFace->goto_table(
                ttFace, tableTag, ttFace->stream, &length);
        if (error)
                // whatever

        unsigned char *outBuffer = // whatever
        error = FT_Stream_Read(ttFace->stream, outBuffer, length);
        if (error)
                // whatever

With the removal of the FT_INTERNAL header files, this code no
longer compiles, and needs to be upgraded to the proper public
FT interfaces.

Now, am I correct in my understanding that this stuff is referred
to as SFNT?  And that it's accessed via some of the functions
like FT_Get_Sfnt_Table()
(http://freetype.sourceforge.net/freetype2/docs/reference/ft2-truetype_tables.html#FT_Get_Sfnt_Table)

If that's the case, does anyone know how I might convert/map the
given LETag integer to a FT_Sfnt_Tag enum?
If this isn't the correct approach, can someone point me in the
right direction?

Many thanks for any help!
Ian