Refactor chunked parsing (API Change):

* parser now has a callback feature for intercepting chunk headers
  and chunk bodies

* The names for basic_parser derived class callbacks have been
  refactored

* basic_parser offers an additional callback for distinguishing
  chunk body data.

Actions Required:

* Adjust signatures for required members of user-defined
  subclasses of basic_parser

* Use the new basic_parser chunk callbacks for accessing
  chunk extensions and chunk bodies.

test/core/CMakeLists.txt

@@ -44,6 +44,7 @@ add_executable (core-tests
     base64.cpp
     empty_base_optimization.cpp
     sha1.cpp
+    detail/varint.cpp
 )
 
 target_link_libraries(core-tests

test/core/Jamfile

@@ -38,4 +38,5 @@ unit-test core-tests :
     base64.cpp
     empty_base_optimization.cpp
     sha1.cpp
+    detail/varint.cpp
     ;

test/core/detail/varint.cpp

@@ -0,0 +1,52 @@
+//
+// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+// Test that header file is self-contained.
+#include <beast/core/detail/varint.hpp>
+
+#include <beast/unit_test/suite.hpp>
+
+namespace beast {
+
+class varint_test : public beast::unit_test::suite
+{
+public:
+    void
+    testVarint()
+    {
+        using beast::detail::varint_read;
+        using beast::detail::varint_size;
+        using beast::detail::varint_write;
+        std::size_t n0 = 0;
+        std::size_t n1 = 1;
+        for(;;)
+        {
+            char buf[16];
+            BOOST_ASSERT(sizeof(buf) >= varint_size(n0));
+            auto it = &buf[0];
+            varint_write(it, n0);
+            it = &buf[0];
+            auto n = varint_read(it);
+            BEAST_EXPECT(n == n0);
+            n = n0 + n1;
+            if(n < n1)
+                break;
+            n0 = n1;
+            n1 = n;
+        }
+    }
+
+    void
+    run()
+    {
+        testVarint();
+    }
+};
+
+BEAST_DEFINE_TESTSUITE(varint,core,beast);
+
+} // beast