C types and utilities to validate and access struct and message headers

mojo/public/c/bindings/struct.h

Index: mojo/public/c/bindings/struct.h
diff --git a/mojo/public/c/bindings/struct.h b/mojo/public/c/bindings/struct.h
new file mode 100644
index 0000000000000000000000000000000000000000..bdc893ef05acd11bbfca6efee4e4704b8e15e512
--- /dev/null
+++ b/mojo/public/c/bindings/struct.h
@@ -0,0 +1,29 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_PUBLIC_C_BINDINGS_STRUCT_H_
+#define MOJO_PUBLIC_C_BINDINGS_STRUCT_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Validates that a given buffer has a mojo struct header and that the size of
+// the struct in the header matches the size of the buffer.
+bool mojo_validate_struct_header(const void* data, size_t size);
+
+typedef struct struct_header {
+  uint32_t num_bytes;
+  uint32_t version;
+} mojo_struct_header_t;
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // MOJO_PUBLIC_C_BINDINGS_STRUCT_H_