mirror of
https://github.com/SELinuxProject/selinux
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2f68def633
This patches moves some ebitmap functions (and, xor, not, etc.) from mcstrans into libsepol, where they really belong and could be used by other applications (e.g. CIL) Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Dan Walsh <dwalsh@redhat.com>
95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
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/* Author : Stephen Smalley, <sds@epoch.ncsc.mil> */
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/* FLASK */
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/*
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* An extensible bitmap is a bitmap that supports an
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* arbitrary number of bits. Extensible bitmaps are
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* used to represent sets of values, such as types,
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* roles, categories, and classes.
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*
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* Each extensible bitmap is implemented as a linked
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* list of bitmap nodes, where each bitmap node has
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* an explicitly specified starting bit position within
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* the total bitmap.
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*/
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#ifndef _SEPOL_POLICYDB_EBITMAP_H_
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#define _SEPOL_POLICYDB_EBITMAP_H_
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#include <stdint.h>
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#include <string.h>
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#define MAPTYPE uint64_t /* portion of bitmap in each node */
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#define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */
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#define MAPBIT 1ULL /* a bit in the node bitmap */
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typedef struct ebitmap_node {
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uint32_t startbit; /* starting position in the total bitmap */
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MAPTYPE map; /* this node's portion of the bitmap */
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struct ebitmap_node *next;
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} ebitmap_node_t;
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typedef struct ebitmap {
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ebitmap_node_t *node; /* first node in the bitmap */
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uint32_t highbit; /* highest position in the total bitmap */
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} ebitmap_t;
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#define ebitmap_length(e) ((e)->highbit)
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#define ebitmap_startbit(e) ((e)->node ? (e)->node->startbit : 0)
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#define ebitmap_startnode(e) ((e)->node)
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static inline unsigned int ebitmap_start(const ebitmap_t * e,
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ebitmap_node_t ** n)
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{
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*n = e->node;
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return ebitmap_startbit(e);
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}
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static inline void ebitmap_init(ebitmap_t * e)
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{
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memset(e, 0, sizeof(*e));
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}
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static inline unsigned int ebitmap_next(ebitmap_node_t ** n, unsigned int bit)
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{
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if ((bit == ((*n)->startbit + MAPSIZE - 1)) && (*n)->next) {
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*n = (*n)->next;
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return (*n)->startbit;
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}
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return (bit + 1);
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}
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static inline int ebitmap_node_get_bit(ebitmap_node_t * n, unsigned int bit)
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{
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if (n->map & (MAPBIT << (bit - n->startbit)))
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return 1;
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return 0;
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}
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#define ebitmap_for_each_bit(e, n, bit) \
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for (bit = ebitmap_start(e, &n); bit < ebitmap_length(e); bit = ebitmap_next(&n, bit)) \
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extern int ebitmap_cmp(const ebitmap_t * e1, const ebitmap_t * e2);
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extern int ebitmap_or(ebitmap_t * dst, const ebitmap_t * e1, const ebitmap_t * e2);
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extern int ebitmap_union(ebitmap_t * dst, const ebitmap_t * e1);
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extern int ebitmap_and(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2);
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extern int ebitmap_xor(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2);
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extern int ebitmap_not(ebitmap_t *dst, ebitmap_t *e1, unsigned int maxbit);
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extern int ebitmap_andnot(ebitmap_t *dst, ebitmap_t *e1, ebitmap_t *e2, unsigned int maxbit);
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extern unsigned int ebitmap_cardinality(ebitmap_t *e1);
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extern int ebitmap_hamming_distance(ebitmap_t * e1, ebitmap_t * e2);
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extern int ebitmap_cpy(ebitmap_t * dst, const ebitmap_t * src);
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extern int ebitmap_contains(const ebitmap_t * e1, const ebitmap_t * e2);
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extern int ebitmap_get_bit(const ebitmap_t * e, unsigned int bit);
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extern int ebitmap_set_bit(ebitmap_t * e, unsigned int bit, int value);
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extern void ebitmap_destroy(ebitmap_t * e);
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extern int ebitmap_read(ebitmap_t * e, void *fp);
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#endif /* _EBITMAP_H_ */
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/* FLASK */
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