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This chunk contains some basic information on the font.

    struct OFHDstruct {
        char   FontName[32];   /* Font name, null padded */
        short  FontAttrs;      /* See FA_*, below */
        IEEE   FontTop,        /* Typical height above baseline */
               FontBot,        /* Typical descent below baseline */
               FontWidth;      /* Typical width, i.e. of the letter O */

    #define FA_BOLD         0x0001
    #define FA_OBLIQUE      0x0002
    #define FA_SERIF        0x0004

The FontName field is a NULL terminated string containing the name of
this font.  FontAttrs is a bit field with flags for several font
attributes.  The flags, as defined above, are bold, oblique, and
serif.  The unused higher order bits are reserved for later use.  The
other fields describe the average dimensions of the characters in this
font.  FontTop is the average height above the baseline, FontBot is
the average descent below the baseline, and FontWidth is the average
character width.

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