text: /* Copyright (c) 2012-2013, The Tor Project, Inc. */
  /* See LICENSE for licensing information */
  
  /**
   * \file replaycache.h
   * \brief Header file for replaycache.c.
   **/
  
  #ifndef TOR_REPLAYCACHE_H
  #define TOR_REPLAYCACHE_H
  
  typedef struct replaycache_s replaycache_t;
  
  #ifdef REPLAYCACHE_PRIVATE
  
  struct replaycache_s {
    /* Scrub interval */
    time_t scrub_interval;
    /* Last scrubbed */
    time_t scrubbed;
    /*
     * Horizon
     * (don't return true on digests in the cache but older than this)
     */
    time_t horizon;
    /*
     * Digest map: keys are digests, values are times the digest was last seen
     */
    digestmap_t *digests_seen;
  };
  
  #endif /* REPLAYCACHE_PRIVATE */
  
  /* replaycache_t free/new */
  
  void replaycache_free(replaycache_t *r);
  replaycache_t * replaycache_new(time_t horizon, time_t interval);
  
  #ifdef REPLAYCACHE_PRIVATE
  
  /*
   * replaycache_t internal functions:
   *
   * These take the time to treat as the present as an argument for easy unit
   * testing.  For everything else, use the wrappers below instead.
   */
  
  STATIC int replaycache_add_and_test_internal(
      time_t present, replaycache_t *r, const void *data, size_t len,
      time_t *elapsed);
  STATIC void replaycache_scrub_if_needed_internal(
      time_t present, replaycache_t *r);
  
  #endif /* REPLAYCACHE_PRIVATE */
  
  /*
   * replaycache_t methods
   */
  
  int replaycache_add_and_test(replaycache_t *r, const void *data, size_t len);
  int replaycache_add_test_and_elapsed(
      replaycache_t *r, const void *data, size_t len, time_t *elapsed);
  void replaycache_scrub_if_needed(replaycache_t *r);
  
  #endif
  
  