1 /* Author : Stephen Smalley, <sds (at) tycho.nsa.gov> */ 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 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 #define MAPTYPE uint64_t /* portion of bitmap in each node */ 28 #define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ 29 #define MAPBIT 1ULL /* a bit in the node bitmap */ 30 31 typedef struct ebitmap_node { 32 uint32_t startbit; /* starting position in the total bitmap */ 33 MAPTYPE map; /* this node's portion of the bitmap */ 34 struct ebitmap_node *next; 35 } ebitmap_node_t; 36 37 typedef struct ebitmap { 38 ebitmap_node_t *node; /* first node in the bitmap */ 39 uint32_t highbit; /* highest position in the total bitmap */ 40 } ebitmap_t; 41 42 #define ebitmap_length(e) ((e)->highbit) 43 #define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0) 44 #define ebitmap_startnode(e) ((e)->node) 45 46 static inline unsigned int ebitmap_start(const ebitmap_t * e, 47 ebitmap_node_t ** n) 48 { 49 50 *n = e->node; 51 return ebitmap_startbit(e); 52 } 53 54 static inline void ebitmap_init(ebitmap_t * e) 55 { 56 memset(e, 0, sizeof(*e)); 57 } 58 59 static inline unsigned int ebitmap_next(ebitmap_node_t ** n, unsigned int bit) 60 { 61 if ((bit == ((*n)->startbit + MAPSIZE - 1)) && (*n)->next) { 62 *n = (*n)->next; 63 return (*n)->startbit; 64 } 65 66 return (bit + 1); 67 } 68 69 static inline int ebitmap_node_get_bit(ebitmap_node_t * n, unsigned int bit) 70 { 71 if (n->map & (MAPBIT << (bit - n->startbit))) 72 return 1; 73 return 0; 74 } 75 76 #define ebitmap_for_each_bit(e, n, bit) \ 77 for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \ 78 79 extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2); 80 extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2); 81 extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1); 82 extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 83 extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 84 extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit); 85 extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit); 86 extern unsigned int ebitmap_cardinality(ebitmap_t *e1); 87 extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2); 88 extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src); 89 extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2); 90 extern int ebitmap_match_any(const ebitmap_t *e1, const ebitmap_t *e2); 91 extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit); 92 extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value); 93 extern void ebitmap_destroy(ebitmap_t * e); 94 extern int ebitmap_read(ebitmap_t * e, void *fp); 95 96 #ifdef __cplusplus 97 } 98 #endif 99 100 #endif /* _EBITMAP_H_ */ 101 102 /* FLASK */ 103
