blob: 471370233fd9e93a1467bb6b3ebaa85b9194b1da [file] [log] [blame]
* 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, <>
#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_ */