mojo/public/c/bindings/lib/struct.c

// 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.

#include "mojo/public/c/bindings/struct.h"

#include <stdint.h>

_Static_assert(sizeof(mojo_struct_header_t) == 8u,
               "mojo_struct_header_t should be 8 bytes");

bool mojo_validate_struct_header(const void* data, size_t size) {
  if (size < sizeof(mojo_struct_header_t) || size > UINT32_MAX) {
    return false;
  }

  const mojo_struct_header_t* header = (const mojo_struct_header_t*)data;

  if (header->num_bytes < sizeof(mojo_struct_header_t) ||
      header->num_bytes > size) {
    return false;
  }

  return true;
}