export pair marshalling (#60)

Author: kyessenov

include/proxy-wasm/exports.h

@@ -27,6 +27,11 @@ extern thread_local ContextBase *current_context_;
 
 namespace exports {
 
+template <typename Pairs> size_t pairsSize(const Pairs &result);
+template <typename Pairs> void marshalPairs(const Pairs &result, char *buffer);
+template <typename Pairs>
+bool getPairs(ContextBase *context, const Pairs &result, uint64_t ptr_ptr, uint64_t size_ptr);
+
 // ABI functions exported from envoy to wasm.
 
 Word get_configuration(void *raw_context, Word address, Word size);

src/exports.cc

@@ -67,6 +67,8 @@ Pairs toPairs(std::string_view buffer) {
   return result;
 }
 
+} // namespace
+
 template <typename Pairs> size_t pairsSize(const Pairs &result) {
   size_t size = 4; // number of headers
   for (auto &p : result) {
@@ -115,8 +117,6 @@ bool getPairs(ContextBase *context, const Pairs &result, uint64_t ptr_ptr, uint6
   return true;
 }
 
-} // namespace
-
 // General ABI.
 
 Word set_property(void *raw_context, Word key_ptr, Word key_size, Word value_ptr, Word value_size) {