You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
49 lines
1.6 KiB
20 years ago
|
/*
|
||
|
|
* 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_ */
|