| /* |
| * An extensible bitmap is a bitmap that supports an |
| * arbitrary number of bits. Extensible bitmaps are |
| * used to represent sets of values, such as types, |
| * roles, categories, and classes. |
| * |
| * Each extensible bitmap is implemented as a linked |
| * list of bitmap nodes, where each bitmap node has |
| * an explicitly specified starting bit position within |
| * the total bitmap. |
| * |
| * Author : Stephen Smalley, <sds@epoch.ncsc.mil> |
| */ |
| #ifndef _SS_EBITMAP_H_ |
| #define _SS_EBITMAP_H_ |
| |
| #define MAPTYPE u64 /* portion of bitmap in each node */ |
| #define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ |
| #define MAPBIT 1ULL /* a bit in the node bitmap */ |
| |
| struct ebitmap_node { |
| u32 startbit; /* starting position in the total bitmap */ |
| MAPTYPE map; /* this node's portion of the bitmap */ |
| struct ebitmap_node *next; |
| }; |
| |
| struct ebitmap { |
| struct ebitmap_node *node; /* first node in the bitmap */ |
| u32 highbit; /* highest position in the total bitmap */ |
| }; |
| |
| #define ebitmap_length(e) ((e)->highbit) |
| #define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0) |
| |
| static inline void ebitmap_init(struct ebitmap *e) |
| { |
| memset(e, 0, sizeof(*e)); |
| } |
| |
| int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2); |
| int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src); |
| int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2); |
| int ebitmap_get_bit(struct ebitmap *e, unsigned long bit); |
| int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value); |
| void ebitmap_destroy(struct ebitmap *e); |
| int ebitmap_read(struct ebitmap *e, void *fp); |
| |
| #endif /* _SS_EBITMAP_H_ */ |