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56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/* Copyright (c) 2003-2004, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2017, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file di_ops.h
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* \brief Headers for di_ops.c
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**/
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#ifndef TOR_DI_OPS_H
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#define TOR_DI_OPS_H
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#include "orconfig.h"
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#include "torint.h"
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int tor_memcmp(const void *a, const void *b, size_t sz);
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int tor_memeq(const void *a, const void *b, size_t sz);
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#define tor_memneq(a,b,sz) (!tor_memeq((a),(b),(sz)))
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/** Alias for the platform's memcmp() function. This function is
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* <em>not</em> data-independent: we define this alias so that we can
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* mark cases where we are deliberately using a data-dependent memcmp()
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* implementation.
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*/
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#define fast_memcmp(a,b,c) (memcmp((a),(b),(c)))
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#define fast_memeq(a,b,c) (0==memcmp((a),(b),(c)))
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#define fast_memneq(a,b,c) (0!=memcmp((a),(b),(c)))
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int safe_mem_is_zero(const void *mem, size_t sz);
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/** A type for a map from DIGEST256_LEN-byte blobs to void*, such that
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* data lookups take an amount of time proportional only to the size
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* of the map, and not to the position or presence of the item in the map.
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*
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* Not efficient for large maps! */
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typedef struct di_digest256_map_t di_digest256_map_t;
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typedef void (*dimap_free_fn)(void *);
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void dimap_free_(di_digest256_map_t *map, dimap_free_fn free_fn);
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#define dimap_free(map, free_fn) \
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do { \
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dimap_free_((map), (free_fn)); \
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(map) = NULL; \
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} while (0)
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void dimap_add_entry(di_digest256_map_t **map,
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const uint8_t *key, void *val);
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void *dimap_search(const di_digest256_map_t *map, const uint8_t *key,
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void *dflt_val);
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int select_array_member_cumulative_timei(const uint64_t *entries,
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int n_entries,
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uint64_t total, uint64_t rand_val);
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#endif /* !defined(TOR_DI_OPS_H) */
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