1 files changed, 67 insertions, 0 deletions
diff --git a/src/feature/hs_common/replaycache.h b/src/feature/hs_common/replaycache.h
new file mode 100644
index 0000000000..3118a88a1a
--- /dev/null
+++ b/src/feature/hs_common/replaycache.h
@@ -0,0 +1,67 @@
+/* Copyright (c) 2012-2018, 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_t replaycache_t;
+
+#ifdef REPLAYCACHE_PRIVATE
+
+struct replaycache_t {
+  /* 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
+   */
+  digest256map_t *digests_seen;
+};
+
+#endif /* defined(REPLAYCACHE_PRIVATE) */
+
+/* replaycache_t free/new */
+
+void replaycache_free_(replaycache_t *r);
+#define replaycache_free(r) \
+  FREE_AND_NULL(replaycache_t, replaycache_free_, (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 /* defined(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 /* !defined(TOR_REPLAYCACHE_H) */