add a posibility to hash raw memory blocks

diff --git a/lib/hashtable.h b/lib/hashtable.h
index 486fe30bb83e5a00b01183c7866a78c2b6794778..aa73ad8f8f69732bfbc07183d355b8fa7d839e77 100644 (file)
--- a/lib/hashtable.h
+++ b/lib/hashtable.h
@@ -2,7 +2,7 @@
  *     UCW Library -- Universal Hash Table
  *
  *     (c) 2002--2004 Martin Mares <mj@ucw.cz>
- *     (c) 2002 Robert Spalek <robert@ucw.cz>
+ *     (c) 2002--2005 Robert Spalek <robert@ucw.cz>
  *
  *     This software may be freely distributed and used according to the terms
  *     of the GNU Lesser General Public License.
@@ -39,6 +39,9 @@
  *                     That is, `type1 k1, type2 k2, ... typen kn'.
  *                     With complex keys, HASH_GIVE_HASHFN and HASH_GIVE_EQ
  *                     are mandatory.
+ *  | HASH_KEY_MEMORY=f        use node->f as a raw data key, compared using
+ *                     memcmp
+ *    HASH_KEY_SIZE    the length of the key block
  *
  *  Then specify what operations you request (all names are automatically
  *  prefixed by calling HASH_PREFIX):
@@ -204,6 +207,30 @@ struct P(table) P(table);
    { HASH_KEY(n->) = k; }
 #endif
 
+#elif defined(HASH_KEY_MEMORY)
+
+#define HASH_KEY(x) x HASH_KEY_MEMORY
+
+#define HASH_KEY_DECL byte HASH_KEY( )[HASH_KEY_SIZE]
+
+#ifndef HASH_GIVE_HASHFN
+#  define HASH_GIVE_HASHFN
+   static inline int P(hash) (TAUC byte *x)
+   { return hash_block(x, HASH_KEY_SIZE); }
+#endif
+
+#ifndef HASH_GIVE_EQ
+#  define HASH_GIVE_EQ
+   static inline int P(eq) (TAUC byte *x, byte *y)
+   { return !memcmp(x, y, HASH_KEY_SIZE); }
+#endif
+
+#ifndef HASH_GIVE_INIT_KEY
+#  define HASH_GIVE_INIT_KEY
+   static inline void P(init_key) (TAUC P(node) *n, byte *k)
+   { memcpy(HASH_KEY(n->), k, HASH_KEY_SIZE); }
+#endif
+
 #elif defined(HASH_KEY_STRING) || defined(HASH_KEY_ENDSTRING)
 
 #ifdef HASH_KEY_STRING