89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
|
|
/* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
|
|
|
|
/* FLASK */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _SEPOL_POLICYDB_EBITMAP_H_
|
|
#define _SEPOL_POLICYDB_EBITMAP_H_
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#define MAPTYPE uint64_t /* 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 */
|
|
|
|
typedef struct ebitmap_node {
|
|
uint32_t startbit; /* starting position in the total bitmap */
|
|
MAPTYPE map; /* this node's portion of the bitmap */
|
|
struct ebitmap_node *next;
|
|
} ebitmap_node_t;
|
|
|
|
typedef struct ebitmap {
|
|
ebitmap_node_t *node; /* first node in the bitmap */
|
|
uint32_t highbit; /* highest position in the total bitmap */
|
|
} ebitmap_t;
|
|
|
|
#define ebitmap_length(e) ((e)->highbit)
|
|
#define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0)
|
|
#define ebitmap_startnode(e) ((e)->node)
|
|
|
|
static inline unsigned int ebitmap_start(const ebitmap_t * e,
|
|
ebitmap_node_t ** n)
|
|
{
|
|
|
|
*n = e->node;
|
|
return ebitmap_startbit(e);
|
|
}
|
|
|
|
static inline void ebitmap_init(ebitmap_t * e)
|
|
{
|
|
memset(e, 0, sizeof(*e));
|
|
}
|
|
|
|
static inline unsigned int ebitmap_next(ebitmap_node_t ** n, unsigned int bit)
|
|
{
|
|
if ((bit == ((*n)->startbit + MAPSIZE - 1)) && (*n)->next) {
|
|
*n = (*n)->next;
|
|
return (*n)->startbit;
|
|
}
|
|
|
|
return (bit + 1);
|
|
}
|
|
|
|
static inline int ebitmap_node_get_bit(ebitmap_node_t * n, unsigned int bit)
|
|
{
|
|
if (n->map & (MAPBIT << (bit - n->startbit)))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
#define ebitmap_for_each_bit(e, n, bit) \
|
|
for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \
|
|
|
|
extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2);
|
|
extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2);
|
|
extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1);
|
|
extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src);
|
|
extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2);
|
|
extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit);
|
|
extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value);
|
|
extern void ebitmap_destroy(ebitmap_t * e);
|
|
extern int ebitmap_read(ebitmap_t * e, void *fp);
|
|
|
|
#endif /* _EBITMAP_H_ */
|
|
|
|
/* FLASK */
|