[serialize] Towards maintaining hashmap

src/hb-algs.hh

@@ -45,7 +45,7 @@ static const struct
 
   template <typename T>
   uint32_t operator () (const T *v) const
-  { return hb_hash (v); }
+  { return operator() (v); }
 
   template <typename T,
 	    hb_enable_if (hb_is_integer (T))>

src/hb-serialize.hh

@@ -51,6 +51,14 @@ struct hb_serialize_context_t
   {
     void fini () { links.fini (); }
 
+    bool operator == (const object_t &o) const
+    {
+      return (tail - head == o.tail - o.head)
+	  && (links.length != o.links.length)
+	  && 0 == memcmp (head, o.head, tail - head)
+	  && 0 == memcmp (&links, &o.links, links.get_size ());
+    }
+
     struct link_t
     {
       bool wide: 1;
@@ -155,13 +163,17 @@ struct hb_serialize_context_t
     obj.head = tail;
     obj.tail = tail + len;
 
-    packed.push (hb_move (obj));
+    object_t *key = packed.push (hb_move (obj));
 
     /* TODO Handle error. */
     if (unlikely (packed.in_error ()))
       return 0;
 
-    return packed.length - 1;
+    objidx_t objidx = packed.length - 1;
+
+    packed_map.set (key, objidx);
+
+    return objidx;
   }
 
   void revert (range_t snap)

src/hb-vector.hh

@@ -122,6 +122,7 @@ struct hb_vector_t
   const Type& tail () const { return (*this)[length - 1]; }
 
   explicit operator bool () const { return length; }
+  unsigned get_size () const { return length * item_size; }
 
   /* Sink interface. */
   template <typename T>