Add serializer service for protobuf
Implements a serializer service for protobuf using nanopb. Adds external
component to fetch nanopb.
Change-Id: I31464be0e38d78bdf543e9f30bd51218e935dc9d
Signed-off-by: Julian Hall <julian.hall@arm.com>
diff --git a/components/service/common/serializer/protobuf/pb_helper.c b/components/service/common/serializer/protobuf/pb_helper.c
new file mode 100644
index 0000000..d32b30c
--- /dev/null
+++ b/components/service/common/serializer/protobuf/pb_helper.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2020, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "pb_helper.h"
+#include <pb_encode.h>
+#include <pb_decode.h>
+
+static bool pb_encode_byte_array(pb_ostream_t *stream, const pb_field_t *field, void * const *arg) {
+
+ const pb_bytes_array_t *byte_array = (const pb_bytes_array_t *)*arg;
+ if (!pb_encode_tag_for_field(stream, field)) return false;
+
+ return pb_encode_string(stream, byte_array->bytes, byte_array->size);
+}
+
+static bool pb_decode_byte_array(pb_istream_t *stream, const pb_field_t *field, void **arg) {
+
+ (void)field;
+ pb_bytes_array_t *byte_array = (pb_bytes_array_t *)*arg;
+ if (stream->bytes_left > byte_array->size) return false;
+
+ byte_array->size = stream->bytes_left;
+
+ return pb_read(stream, byte_array->bytes, stream->bytes_left);
+}
+
+pb_callback_t pb_out_byte_array(const pb_bytes_array_t *byte_array) {
+
+ pb_callback_t callback;
+ callback.funcs.encode = pb_encode_byte_array;
+ callback.arg = (void*)byte_array;
+
+ return callback;
+}
+
+pb_callback_t pb_in_byte_array(pb_bytes_array_t *byte_array) {
+
+ pb_callback_t callback;
+ callback.funcs.decode = pb_decode_byte_array;
+ callback.arg = (void*)byte_array;
+ return callback;
+}
+
+pb_bytes_array_t *pb_malloc_byte_array(size_t num_bytes) {
+
+ pb_bytes_array_t *byte_array = (pb_bytes_array_t*)malloc(offsetof(pb_bytes_array_t, bytes) + num_bytes);
+
+ if (byte_array) {
+
+ byte_array->size = num_bytes;
+ }
+
+ return byte_array;
+}
+
+pb_bytes_array_t *pb_malloc_byte_array_containing_string(const char *str) {
+
+ pb_bytes_array_t *byte_array;
+ size_t required_space = strlen(str) + 1;
+
+ byte_array = pb_malloc_byte_array(required_space);
+
+ if (byte_array) {
+
+ memcpy(byte_array->bytes, str, required_space);
+ }
+
+ return byte_array;
+}
+
+pb_bytes_array_t *pb_malloc_byte_array_containing_bytes(const uint8_t *buf, size_t num_bytes) {
+
+ pb_bytes_array_t *byte_array = pb_malloc_byte_array(num_bytes);
+
+ if (byte_array) {
+
+ memcpy(byte_array->bytes, buf, num_bytes);
+ }
+
+ return byte_array;
+}