New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/coding/base64.cpp

@@ -0,0 +1,41 @@
+#include "coding/base64.hpp"
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wreorder"
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-local-typedef"
+#endif
+
+#include <boost/algorithm/string.hpp>
+#include <boost/archive/iterators/base64_from_binary.hpp>
+#include <boost/archive/iterators/binary_from_base64.hpp>
+#include <boost/archive/iterators/transform_width.hpp>
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
+namespace base64
+{
+// From: http://stackoverflow.com/a/28471421
+
+std::string Decode(const std::string & val)
+{
+  using namespace boost::archive::iterators;
+  using It = transform_width<binary_from_base64<std::string::const_iterator>, 8, 6>;
+  return boost::algorithm::trim_right_copy_if(std::string(It(std::begin(val)), It(std::end(val))),
+                                              [](char c) { return c == '\0'; });
+}
+
+std::string Encode(std::string_view val)
+{
+  using namespace boost::archive::iterators;
+  using It = base64_from_binary<transform_width<std::string_view::const_iterator, 6, 8>>;
+  auto tmp = std::string(It(std::begin(val)), It(std::end(val)));
+  return tmp.append((3 - val.size() % 3) % 3, '=');
+}
+}  // namespace base64