Adding dynamic memory allocation.

src/jsonparser.cpp

@@ -23,3 +23,15 @@ bool json_parse(const u8 *buf, size_t len, ParsedJson &pj) {
   return isok;
 }
 
+WARN_UNUSED
+ParsedJson build_parsed_json(const u8 *buf, size_t len) {
+  ParsedJson pj;
+  bool ok = pj.allocateCapacity(len);
+  if(ok) {
+    ok = json_parse(buf, len, pj);
+    assert(ok == pj.isValid());
+  } else {
+    std::cerr << "failure during memory allocation " << std::endl;
+  }
+  return pj;
+}