1// SPDX-License-Identifier: MIT
2/*
3 * Copyright (C) 2016 The Android Open Source Project
4 */
5
6#include "avb_footer.h"
7#include "avb_util.h"
8
9bool avb_footer_validate_and_byteswap(const AvbFooter* src, AvbFooter* dest) {
10  avb_memcpy(dest, src, sizeof(AvbFooter));
11
12  dest->version_major = avb_be32toh(dest->version_major);
13  dest->version_minor = avb_be32toh(dest->version_minor);
14
15  dest->original_image_size = avb_be64toh(dest->original_image_size);
16  dest->vbmeta_offset = avb_be64toh(dest->vbmeta_offset);
17  dest->vbmeta_size = avb_be64toh(dest->vbmeta_size);
18
19  /* Check that magic is correct. */
20  if (avb_safe_memcmp(dest->magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN) !=
21      0) {
22    avb_error("Footer magic is incorrect.\n");
23    return false;
24  }
25
26  /* Ensure we don't attempt to access any fields if the footer major
27   * version is not supported.
28   */
29  if (dest->version_major > AVB_FOOTER_VERSION_MAJOR) {
30    avb_error("No support for footer version.\n");
31    return false;
32  }
33
34  return true;
35}
36