1 2 /* Author : Stephen Smalley, <sds (at) epoch.ncsc.mil> */ 3 4 /* FLASK */ 5 6 /* 7 * An extensible bitmap is a bitmap that supports an 8 * arbitrary number of bits. Extensible bitmaps are 9 * used to represent sets of values, such as types, 10 * roles, categories, and classes. 11 * 12 * Each extensible bitmap is implemented as a linked 13 * list of bitmap nodes, where each bitmap node has 14 * an explicitly specified starting bit position within 15 * the total bitmap. 16 */ 17 18 #ifndef _SEPOL_POLICYDB_EBITMAP_H_ 19 #define _SEPOL_POLICYDB_EBITMAP_H_ 20 21 #include <stdint.h> 22 #include <string.h> 23 24 #define MAPTYPE uint64_t /* portion of bitmap in each node */ 25 #define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ 26 #define MAPBIT 1ULL /* a bit in the node bitmap */ 27 28 typedef struct ebitmap_node { 29 uint32_t startbit; /* starting position in the total bitmap */ 30 MAPTYPE map; /* this node's portion of the bitmap */ 31 struct ebitmap_node *next; 32 } ebitmap_node_t; 33 34 typedef struct ebitmap { 35 ebitmap_node_t *node; /* first node in the bitmap */ 36 uint32_t highbit; /* highest position in the total bitmap */ 37 } ebitmap_t; 38 39 #define ebitmap_length(e) ((e)->highbit) 40 #define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0) 41 #define ebitmap_startnode(e) ((e)->node) 42 43 static inline unsigned int ebitmap_start(const ebitmap_t * e, 44 ebitmap_node_t ** n) 45 { 46 47 *n = e->node; 48 return ebitmap_startbit(e); 49 } 50 51 static inline void ebitmap_init(ebitmap_t * e) 52 { 53 memset(e, 0, sizeof(*e)); 54 } 55 56 static inline unsigned int ebitmap_next(ebitmap_node_t ** n, unsigned int bit) 57 { 58 if ((bit == ((*n)->startbit + MAPSIZE - 1)) && (*n)->next) { 59 *n = (*n)->next; 60 return (*n)->startbit; 61 } 62 63 return (bit + 1); 64 } 65 66 static inline int ebitmap_node_get_bit(ebitmap_node_t * n, unsigned int bit) 67 { 68 if (n->map & (MAPBIT << (bit - n->startbit))) 69 return 1; 70 return 0; 71 } 72 73 #define ebitmap_for_each_bit(e, n, bit) \ 74 for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \ 75 76 extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2); 77 extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2); 78 extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1); 79 extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 80 extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 81 extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit); 82 extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit); 83 extern unsigned int ebitmap_cardinality(ebitmap_t *e1); 84 extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2); 85 extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src); 86 extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2); 87 extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit); 88 extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value); 89 extern void ebitmap_destroy(ebitmap_t * e); 90 extern int ebitmap_read(ebitmap_t * e, void *fp); 91 92 #endif /* _EBITMAP_H_ */ 93 94 /* FLASK */ 95
