1/* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
2
3/* FLASK */
4
5/*
6 * An extensible bitmap is a bitmap that supports an
7 * arbitrary number of bits.  Extensible bitmaps are
8 * used to represent sets of values, such as types,
9 * roles, categories, and classes.
10 *
11 * Each extensible bitmap is implemented as a linked
12 * list of bitmap nodes, where each bitmap node has
13 * an explicitly specified starting bit position within
14 * the total bitmap.
15 */
16
17#ifndef _SEPOL_POLICYDB_EBITMAP_H_
18#define _SEPOL_POLICYDB_EBITMAP_H_
19
20#include <stdint.h>
21#include <string.h>
22#include <sys/cdefs.h>
23
24__BEGIN_DECLS
25
26#define MAPTYPE uint64_t	/* portion of bitmap in each node */
27#define MAPSIZE (sizeof(MAPTYPE) * 8)	/* number of bits in node bitmap */
28#define MAPBIT  1ULL		/* a bit in the node bitmap */
29
30typedef struct ebitmap_node {
31	uint32_t startbit;	/* starting position in the total bitmap */
32	MAPTYPE map;		/* this node's portion of the bitmap */
33	struct ebitmap_node *next;
34} ebitmap_node_t;
35
36typedef struct ebitmap {
37	ebitmap_node_t *node;	/* first node in the bitmap */
38	uint32_t highbit;	/* highest position in the total bitmap */
39} ebitmap_t;
40
41#define ebitmap_length(e) ((e)->highbit)
42#define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0)
43#define ebitmap_startnode(e) ((e)->node)
44
45static inline unsigned int ebitmap_start(const ebitmap_t * e,
46					 ebitmap_node_t ** n)
47{
48
49	*n = e->node;
50	return ebitmap_startbit(e);
51}
52
53static inline void ebitmap_init(ebitmap_t * e)
54{
55	memset(e, 0, sizeof(*e));
56}
57
58static inline unsigned int ebitmap_next(ebitmap_node_t ** n, unsigned int bit)
59{
60	if ((bit == ((*n)->startbit + MAPSIZE - 1)) && (*n)->next) {
61		*n = (*n)->next;
62		return (*n)->startbit;
63	}
64
65	return (bit + 1);
66}
67
68static inline int ebitmap_node_get_bit(ebitmap_node_t * n, unsigned int bit)
69{
70	if (n->map & (MAPBIT << (bit - n->startbit)))
71		return 1;
72	return 0;
73}
74
75#define ebitmap_for_each_bit(e, n, bit) \
76	for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \
77
78extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2);
79extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2);
80extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1);
81extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2);
82extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2);
83extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit);
84extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit);
85extern unsigned int ebitmap_cardinality(ebitmap_t *e1);
86extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2);
87extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src);
88extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2);
89extern int ebitmap_match_any(const ebitmap_t *e1, const ebitmap_t *e2);
90extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit);
91extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value);
92extern void ebitmap_destroy(ebitmap_t * e);
93extern int ebitmap_read(ebitmap_t * e, void *fp);
94
95__END_DECLS
96#endif				/* _EBITMAP_H_ */
97
98/* FLASK */
99