1/* Author : Stephen Smalley, <sds@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 24extern "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 31typedef 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 37typedef 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 46static 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 54static inline void ebitmap_init(ebitmap_t * e) 55{ 56 memset(e, 0, sizeof(*e)); 57} 58 59static 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 69static 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 79extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2); 80extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2); 81extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1); 82extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 83extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2); 84extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit); 85extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit); 86extern unsigned int ebitmap_cardinality(ebitmap_t *e1); 87extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2); 88extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src); 89extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2); 90extern int ebitmap_match_any(const ebitmap_t *e1, const ebitmap_t *e2); 91extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit); 92extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value); 93extern void ebitmap_destroy(ebitmap_t * e); 94extern int ebitmap_read(ebitmap_t * e, void *fp); 95 96#ifdef __cplusplus 97} 98#endif 99 100#endif /* _EBITMAP_H_ */ 101 102/* FLASK */ 103