From edf5b7cd038709daa396b5820ea5c349f7899249 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Sat, 2 Mar 2019 08:42:56 -0800
Subject: [PATCH] Fix HTTP parser static string calculation

---
 CHANGELOG.md                             | 1 +
 include/boost/beast/http/impl/fields.hpp | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6aece344..fb8bee09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@ Version 226:
 
 * Support -fno-exceptions
 * make_strand is in net::
+* Fix HTTP parser static string calculation
 
 --------------------------------------------------------------------------------
 
diff --git a/include/boost/beast/http/impl/fields.hpp b/include/boost/beast/http/impl/fields.hpp
index 77f151fe..9616af82 100644
--- a/include/boost/beast/http/impl/fields.hpp
+++ b/include/boost/beast/http/impl/fields.hpp
@@ -14,6 +14,7 @@
 #include <boost/beast/core/string.hpp>
 #include <boost/beast/core/static_string.hpp>
 #include <boost/beast/core/detail/buffers_ref.hpp>
+#include <boost/beast/core/detail/clamp.hpp>
 #include <boost/beast/http/verb.hpp>
 #include <boost/beast/http/rfc7230.hpp>
 #include <boost/beast/http/status.hpp>
@@ -1018,7 +1019,8 @@ set_chunked_impl(bool value)
             itt = next;
         }
         static_string<max_static_buffer> buf;
-        if(it->value().size() <= buf.size() + 9)
+        if(! beast::detail::sum_exceeds(
+            it->value().size(), 9u, buf.max_size()))
         {
             buf.append(it->value().data(), it->value().size());
             buf.append(", chunked", 9);