1 /* Author : Stephen Smalley, <sds (at) 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 30 typedef 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 36 typedef 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 45 static 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 53 static inline void ebitmap_init(ebitmap_t * e) 54 { 55 memset(e, 0, sizeof(*e)); 56 } 57 58 static 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 68 static 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 78 extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2); 79 extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2); 80 extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1); 81 extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 82 extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 83 extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit); 84 extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit); 85 extern unsigned int ebitmap_cardinality(ebitmap_t *e1); 86 extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2); 87 extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src); 88 extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2); 89 extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit); 90 extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value); 91 extern void ebitmap_destroy(ebitmap_t * e); 92 extern int ebitmap_read(ebitmap_t * e, void *fp); 93 94 __END_DECLS 95 #endif /* _EBITMAP_H_ */ 96 97 /* FLASK */ 98
