1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2016 The Android Open Source Project
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Permission is hereby granted, free of charge, to any person
5*4882a593Smuzhiyun * obtaining a copy of this software and associated documentation
6*4882a593Smuzhiyun * files (the "Software"), to deal in the Software without
7*4882a593Smuzhiyun * restriction, including without limitation the rights to use, copy,
8*4882a593Smuzhiyun * modify, merge, publish, distribute, sublicense, and/or sell copies
9*4882a593Smuzhiyun * of the Software, and to permit persons to whom the Software is
10*4882a593Smuzhiyun * furnished to do so, subject to the following conditions:
11*4882a593Smuzhiyun *
12*4882a593Smuzhiyun * The above copyright notice and this permission notice shall be
13*4882a593Smuzhiyun * included in all copies or substantial portions of the Software.
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16*4882a593Smuzhiyun * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17*4882a593Smuzhiyun * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18*4882a593Smuzhiyun * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19*4882a593Smuzhiyun * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20*4882a593Smuzhiyun * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21*4882a593Smuzhiyun * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22*4882a593Smuzhiyun * SOFTWARE.
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun #include <android_avb/avb_footer.h>
26*4882a593Smuzhiyun #include <android_avb/avb_util.h>
27*4882a593Smuzhiyun
avb_footer_validate_and_byteswap(const AvbFooter * src,AvbFooter * dest)28*4882a593Smuzhiyun bool avb_footer_validate_and_byteswap(const AvbFooter* src, AvbFooter* dest) {
29*4882a593Smuzhiyun avb_memcpy(dest, src, sizeof(AvbFooter));
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun dest->version_major = avb_be32toh(dest->version_major);
32*4882a593Smuzhiyun dest->version_minor = avb_be32toh(dest->version_minor);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun dest->original_image_size = avb_be64toh(dest->original_image_size);
35*4882a593Smuzhiyun dest->vbmeta_offset = avb_be64toh(dest->vbmeta_offset);
36*4882a593Smuzhiyun dest->vbmeta_size = avb_be64toh(dest->vbmeta_size);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* Check that magic is correct. */
39*4882a593Smuzhiyun if (avb_safe_memcmp(dest->magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN) !=
40*4882a593Smuzhiyun 0) {
41*4882a593Smuzhiyun avb_error("Footer magic is incorrect.\n");
42*4882a593Smuzhiyun return false;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun /* Ensure we don't attempt to access any fields if the footer major
46*4882a593Smuzhiyun * version is not supported.
47*4882a593Smuzhiyun */
48*4882a593Smuzhiyun if (dest->version_major > AVB_FOOTER_VERSION_MAJOR) {
49*4882a593Smuzhiyun avb_error("No support for footer version.\n");
50*4882a593Smuzhiyun return false;
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun return true;
54*4882a593Smuzhiyun }
55