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[array] Don't clear serializer buffer when copying out 

Not needed.
This commit is contained in:
Behdad Esfahbod 2022-12-01 14:19:27 -07:00
parent 57808609c9
commit 3b68c7146f
2 changed files with 9 additions and 8 deletions
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4
src/hb-array.hh
View File

@ -272,7 +272,7 @@ struct hb_array_t : hb_iter_with_fallback_t<hb_array_t<Type>, Type&>
{
TRACE_SERIALIZE (this);
auto* out = c->start_embed (arrayZ);
if (unlikely (!c->extend_size (out, get_size ()))) return_trace (hb_array_t ());
if (unlikely (!c->extend_size (out, get_size (), false))) return_trace (hb_array_t ());
for (unsigned i = 0; i < length; i++)
out[i] = arrayZ[i]; /* TODO: add version that calls c->copy() */
return_trace (hb_array_t (out, length));
@ -285,7 +285,7 @@ struct hb_array_t : hb_iter_with_fallback_t<hb_array_t<Type>, Type&>
{
TRACE_SERIALIZE (this);
auto* out = c->start_embed (arrayZ);
if (unlikely (!c->extend_size (out, get_size ()))) return_trace (hb_array_t ());
if (unlikely (!c->extend_size (out, get_size (), false))) return_trace (hb_array_t ());
hb_memcpy (out, arrayZ, length);
return_trace (hb_array_t (out, length));
}

13
src/hb-serialize.hh
View File

@ -571,7 +571,7 @@ struct hb_serialize_context_t
}
template <typename Type>
Type *allocate_size (size_t size)
Type *allocate_size (size_t size, bool clear = true)
{
if (unlikely (in_error ())) return nullptr;
@ -580,7 +580,8 @@ struct hb_serialize_context_t
err (HB_SERIALIZE_ERROR_OUT_OF_ROOM);
return nullptr;
}
hb_memset (this->head, 0, size);
if (clear)
hb_memset (this->head, 0, size);
char *ret = this->head;
this->head += size;
return reinterpret_cast<Type *> (ret);
@ -635,7 +636,7 @@ struct hb_serialize_context_t
hb_serialize_context_t& operator << (const Type &obj) & { embed (obj); return *this; }
template <typename Type>
Type *extend_size (Type *obj, size_t size)
Type *extend_size (Type *obj, size_t size, bool clear = true)
{
if (unlikely (in_error ())) return nullptr;
@ -643,12 +644,12 @@ struct hb_serialize_context_t
assert ((char *) obj <= this->head);
assert ((size_t) (this->head - (char *) obj) <= size);
if (unlikely (((char *) obj + size < (char *) obj) ||
!this->allocate_size<Type> (((char *) obj) + size - this->head))) return nullptr;
!this->allocate_size<Type> (((char *) obj) + size - this->head, clear))) return nullptr;
return reinterpret_cast<Type *> (obj);
}
template <typename Type>
Type *extend_size (Type &obj, size_t size)
{ return extend_size (std::addressof (obj), size); }
Type *extend_size (Type &obj, size_t size, bool clear = true)
{ return extend_size (std::addressof (obj), size, clear); }
template <typename Type>
Type *extend_min (Type *obj) { return extend_size (obj, obj->min_size); }