Sync with 8 months of Google-internal development.

Many things have changed and been simplified.
The memory-management story for upb_def and upb_handlers
is much more robust; upb_def and upb_handlers should be
fairly stable interfaces now.  There is still much work
to do for the runtime component (upb_sink).

1 files changed, 16 insertions, 0 deletions

diff --git a/upb/google/README b/upb/google/README
new file mode 100644
index 0000000..a237583
--- /dev/null
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+This directory contains code to interoperate with Google's official
+Protocol Buffers release.  Since it doesn't really have a name
+besides "protobuf," calling this directory "google" seems like the
+least confusing option.
+
+We support writing into protobuf's generated classes (and hopefully
+reading too, before long).  We support both the open source protobuf
+release and the Google-internal version of the same code.  The two
+live in different namespaces, and the internal version supports some
+features that are not supported in the open-source release.  Also, the
+internal version includes the legacy "proto1" classes which we must
+support; thankfully this is mostly relegated to its own separate file.
+
+Our functionality requires the full google::protobuf::Message
+interface; we rely on reflection so we know what fields to read/write
+and where to put them, so we can't support MessageLite.