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[serializer] Implement dedup!

This commit is contained in:
Behdad Esfahbod 2019-03-30 19:46:35 -07:00
parent b189bbc48f
commit 313b3057c3
1 changed files with 15 additions and 3 deletions
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18
src/hb-serialize.hh
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@ -83,6 +83,12 @@ struct hb_serialize_context_t
this->end = this->start + size; this->end = this->start + size;
reset (); reset ();
} }
~hb_serialize_context_t ()
{
current.fini_deep ();
packed.fini_deep ();
packed_map.fini ();
}
bool in_error () const { return !this->successful; } bool in_error () const { return !this->successful; }
@ -158,8 +164,15 @@ struct hb_serialize_context_t
objidx_t pop_pack () objidx_t pop_pack ()
{ {
object_t obj = current.pop (); object_t obj = current.pop ();
obj.tail = head;
unsigned len = obj.tail - obj.head;
unsigned len = head - obj.head; objidx_t objidx = packed_map.get (&obj);
if (objidx)
{
obj.fini ();
return objidx;
}
tail -= len; tail -= len;
memmove (tail, obj.head, len); memmove (tail, obj.head, len);
@ -177,7 +190,7 @@ struct hb_serialize_context_t
if (unlikely (packed.in_error ())) if (unlikely (packed.in_error ()))
return 0; return 0;
objidx_t objidx = packed.length - 1; objidx = packed.length - 1;
packed_map.set (key, objidx); packed_map.set (key, objidx);
@ -305,7 +318,6 @@ struct hb_serialize_context_t
private: private:
/* Stack of currently under construction objects. */ /* Stack of currently under construction objects. */
/* Note. We store the "end - tail" distance in the length member of these. */
hb_vector_t<object_t> current; hb_vector_t<object_t> current;
/* Stack of packed objects. Object 0 is always nil object. */ /* Stack of packed objects. Object 0 is always nil object. */