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[serialize] Add add_link() to add link

This commit is contained in:
Behdad Esfahbod 2019-04-01 16:17:30 -07:00
parent 74addbecac
commit 72e9b2c16c
1 changed files with 23 additions and 3 deletions
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26
src/hb-serialize.hh
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@ -66,7 +66,7 @@ struct hb_serialize_context_t
struct link_t struct link_t
{ {
bool wide: 1; bool is_wide: 1;
unsigned position : 31; unsigned position : 31;
objidx_t objidx; objidx_t objidx;
}; };
@ -196,6 +196,7 @@ struct hb_serialize_context_t
objidx = packed.length - 1; objidx = packed.length - 1;
if (0) // XXX
packed_map.set (key, objidx); packed_map.set (key, objidx);
return objidx; return objidx;
@ -219,8 +220,27 @@ struct hb_serialize_context_t
} }
template <typename T> template <typename T>
void add_link (T &ofs, objidx_t objidx, const void *base) void add_link (T &ofs, objidx_t objidx, const void *base = nullptr)
{ {
static_assert (sizeof (T) == 2 || sizeof (T) == 4, "");
if (unlikely (!objidx))
return;
unsigned i = current.length - 1;
if (!base)
base = current[i].head;
else
{
while (i && base < current[i].head)
i--;
assert (base == current[i].head);
}
auto& link = *current[i].links.push ();
link.is_wide = sizeof (T) == 4;
link.position = (const char *) &ofs - (const char *) base;
link.objidx = objidx;
} }
void link () void link ()
@ -237,7 +257,7 @@ struct hb_serialize_context_t
const object_t &child = packed[link.objidx]; const object_t &child = packed[link.objidx];
unsigned offset = child.head - parent.head; unsigned offset = child.head - parent.head;
if (link.wide) if (link.is_wide)
{ {
auto &off = * ((BEInt<uint32_t, 4> *) (parent.head + offset)); auto &off = * ((BEInt<uint32_t, 4> *) (parent.head + offset));
off = offset; off = offset;