di_ops.h 1.5 KB

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  1. /* Copyright (c) 2003-2004, Roger Dingledine
  2. * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
  3. * Copyright (c) 2007-2013, The Tor Project, Inc. */
  4. /* See LICENSE for licensing information */
  5. /**
  6. * \file di_ops.h
  7. * \brief Headers for di_ops.c
  8. **/
  9. #ifndef TOR_DI_OPS_H
  10. #define TOR_DI_OPS_H
  11. #include "orconfig.h"
  12. #include "torint.h"
  13. int tor_memcmp(const void *a, const void *b, size_t sz);
  14. int tor_memeq(const void *a, const void *b, size_t sz);
  15. #define tor_memneq(a,b,sz) (!tor_memeq((a),(b),(sz)))
  16. /** Alias for the platform's memcmp() function. This function is
  17. * <em>not</em> data-independent: we define this alias so that we can
  18. * mark cases where we are deliberately using a data-dependent memcmp()
  19. * implementation.
  20. */
  21. #define fast_memcmp(a,b,c) (memcmp((a),(b),(c)))
  22. #define fast_memeq(a,b,c) (0==memcmp((a),(b),(c)))
  23. #define fast_memneq(a,b,c) (0!=memcmp((a),(b),(c)))
  24. int safe_mem_is_zero(const void *mem, size_t sz);
  25. /** A type for a map from DIGEST256_LEN-byte blobs to void*, such that
  26. * data lookups take an amount of time proportional only to the size
  27. * of the map, and not to the position or presence of the item in the map.
  28. *
  29. * Not efficient for large maps! */
  30. typedef struct di_digest256_map_t di_digest256_map_t;
  31. typedef void (*dimap_free_fn)(void *);
  32. void dimap_free(di_digest256_map_t *map, dimap_free_fn free_fn);
  33. void dimap_add_entry(di_digest256_map_t **map,
  34. const uint8_t *key, void *val);
  35. void *dimap_search(const di_digest256_map_t *map, const uint8_t *key,
  36. void *dflt_val);
  37. #endif