/* 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 */
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