- introduce bitset

- add hash_block()

src/lib/utils.c

@@ -651,13 +651,29 @@ uint32_t hash64(uint64_t x)
     return hash4(a, b, c, d);
 }
 
+#define RUN_HASH(hc, c) (((hc) << 5) + (hc) + (c))
+
+uint32_t hash_block(char* buf, size_t len)
+{
+    uint32_t hc = 5381;
+    int      i;
+
+    for (i = 0; i < len; i++) {
+        int c = (int)buf[i];
+
+        hc = RUN_HASH(hc, c);
+    }
+
+    return hc;
+}
+
 uint32_t hash_string(const char* key)
 {
     uint32_t hc = 5381;
     int      c;
 
     while ((c = *key++)) {
-        hc = ((hc << 5) + hc) + c;
+        hc = RUN_HASH(hc, c);
     }
 
     return hc;