Serialize and deserialize null (#783)

* Build (grpc's) nanopb with -DPB_FIELD_16BIT

We require (at least) 16 bit fields. (By default, nanopb uses 8 bit
fields, ie allowing up to 256 field tags.)

Also note that this patch adds this to grpc's nanopb, rather than to our
nanopb. We'll need to eventually either:
a) we instruct grpc to use our nanopb
b) we rely on grpc's nanopb instead of using our own.

(^ marked as a TODO for now.)

* Add some dependant protos

Imported from protobuf. Nanopb requires these to be present (though
anything using libprotobuf does not, as these are already built into
that.)

* Add generated nanopb protos based off of newly added proto definitions

* Build the nanopb protos

* Serialize and deserialize null

1 files changed, 69 insertions, 0 deletions

diff --git a/Firestore/Protos/nanopb/google/protobuf/any.pb.h b/Firestore/Protos/nanopb/google/protobuf/any.pb.h
new file mode 100644
index 0000000..10a722e
--- /dev/null
+++ b/Firestore/Protos/nanopb/google/protobuf/any.pb.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2018 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* Automatically generated nanopb header */
+/* Generated by nanopb-0.3.8 at Mon Feb 12 11:03:06 2018. */
+
+#ifndef PB_GOOGLE_PROTOBUF_ANY_PB_H_INCLUDED
+#define PB_GOOGLE_PROTOBUF_ANY_PB_H_INCLUDED
+#include <pb.h>
+
+/* @@protoc_insertion_point(includes) */
+#if PB_PROTO_HEADER_VERSION != 30
+#error Regenerate this file with the current version of nanopb generator.
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Struct definitions */
+typedef struct _google_protobuf_Any {
+    pb_callback_t type_url;
+    pb_callback_t value;
+/* @@protoc_insertion_point(struct:google_protobuf_Any) */
+} google_protobuf_Any;
+
+/* Default values for struct fields */
+
+/* Initializer values for message structs */
+#define google_protobuf_Any_init_default         {{{NULL}, NULL}, {{NULL}, NULL}}
+#define google_protobuf_Any_init_zero            {{{NULL}, NULL}, {{NULL}, NULL}}
+
+/* Field tags (for use in manual encoding/decoding) */
+#define google_protobuf_Any_type_url_tag         1
+#define google_protobuf_Any_value_tag            2
+
+/* Struct field encoding specification for nanopb */
+extern const pb_field_t google_protobuf_Any_fields[3];
+
+/* Maximum encoded size of messages (where known) */
+/* google_protobuf_Any_size depends on runtime parameters */
+
+/* Message IDs (where set with "msgid" option) */
+#ifdef PB_MSGID
+
+#define ANY_MESSAGES \
+
+
+#endif
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+/* @@protoc_insertion_point(eof) */
+
+#endif