[OT] Start adding serialize() API
diff --git a/src/hb-open-type-private.hh b/src/hb-open-type-private.hh
index 4cbb855..7cd8212 100644
--- a/src/hb-open-type-private.hh
+++ b/src/hb-open-type-private.hh
@@ -327,6 +327,83 @@
+/*
+ * Serialize
+ */
+
+#ifndef HB_DEBUG_SERIALIZE
+#define HB_DEBUG_SERIALIZE (HB_DEBUG+0)
+#endif
+
+
+#define TRACE_SERIALIZE() \
+ hb_auto_trace_t<HB_DEBUG_SERIALIZE> trace (&c->debug_depth, "SERIALIZE", this, HB_FUNC, "");
+
+
+struct hb_serialize_context_t
+{
+ inline void init (void *start, unsigned int size)
+ {
+ this->start = (char *) start;
+ this->end = this->start + size;
+ }
+
+ inline void start_processing (void)
+ {
+ this->ran_out_of_room = false;
+ this->head = this->start;
+ this->debug_depth = 0;
+
+ DEBUG_MSG_LEVEL (SERIALIZE, this->start, 0, +1,
+ "start [%p..%p] (%lu bytes)",
+ this->start, this->end,
+ (unsigned long) (this->end - this->start));
+ }
+
+ inline void end_processing (void)
+ {
+ DEBUG_MSG_LEVEL (SERIALIZE, this->start, 0, -1,
+ "end [%p..%p] %s",
+ this->start, this->end,
+ this->ran_out_of_room ? "RAN OUT OF ROOM" : "did not ran out of room");
+
+ this->start = this->end = this->head = NULL;
+ }
+
+ template <typename Type>
+ inline Type *allocate (unsigned int size = -1, unsigned int alignment = 2)
+ {
+ if (size == -1)
+ size == Type::static_size;
+ unsigned int padding = (alignment - (this->head - this->start) % alignment) % alignment; /* TODO speedup */
+ if (unlikely (this->ran_out_of_room || this->end - this->head > padding + size)) {
+ this->ran_out_of_room = true;
+ return NULL;
+ }
+ this->head += padding;
+ const char *ret = this->head;
+ this->head += size;
+ return reinterpret_cast<Type *> (ret);
+ }
+
+ template <typename Type>
+ inline Type *embed (const Type &obj, unsigned int alignment = 2)
+ {
+ return allocate (obj.size (), alignment);
+ }
+
+ inline void truncate (void *head)
+ {
+ assert (this->start < head && head <= this->head);
+ this->head = (char *) head;
+ }
+
+ unsigned int debug_depth;
+ char *start, *end, *head;
+ bool ran_out_of_room;
+};
+
+
/*
*
