/usr/include/fontforge/encoding.h is in libfontforge-dev 0.0.20110222-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #ifndef _ENCODING_H
#define _ENCODING_H
struct cidaltuni {
    struct cidaltuni *next;
    int uni;
    int cid;
};
struct cidmap {
    char *registry, *ordering;
    int supplement, maxsupple;
    int cidmax;			/* Max cid found in the charset */
    int namemax;		/* Max cid with useful info */
    uint32 *unicode;
    char **name;
    struct cidaltuni *alts;
    struct cidmap *next;
};
extern struct cidmap *cidmaps;
extern void DeleteEncoding(Encoding *me);
extern void RemoveMultiples(Encoding *item);
#endif
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