Google

Edit File: ebitmap.h

/* 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> #include <sys/cdefs.h> __BEGIN_DECLS #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_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit); extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit); extern unsigned int ebitmap_cardinality(ebitmap_t *e1); extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2); 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_match_any(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); __END_DECLS #endif /* _EBITMAP_H_ */ /* FLASK */