1*37a7bc39SJason Zhu /*
2*37a7bc39SJason Zhu * Copyright (C) 2016 The Android Open Source Project
3*37a7bc39SJason Zhu *
4*37a7bc39SJason Zhu * Permission is hereby granted, free of charge, to any person
5*37a7bc39SJason Zhu * obtaining a copy of this software and associated documentation
6*37a7bc39SJason Zhu * files (the "Software"), to deal in the Software without
7*37a7bc39SJason Zhu * restriction, including without limitation the rights to use, copy,
8*37a7bc39SJason Zhu * modify, merge, publish, distribute, sublicense, and/or sell copies
9*37a7bc39SJason Zhu * of the Software, and to permit persons to whom the Software is
10*37a7bc39SJason Zhu * furnished to do so, subject to the following conditions:
11*37a7bc39SJason Zhu *
12*37a7bc39SJason Zhu * The above copyright notice and this permission notice shall be
13*37a7bc39SJason Zhu * included in all copies or substantial portions of the Software.
14*37a7bc39SJason Zhu *
15*37a7bc39SJason Zhu * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16*37a7bc39SJason Zhu * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17*37a7bc39SJason Zhu * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18*37a7bc39SJason Zhu * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19*37a7bc39SJason Zhu * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20*37a7bc39SJason Zhu * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21*37a7bc39SJason Zhu * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22*37a7bc39SJason Zhu * SOFTWARE.
23*37a7bc39SJason Zhu */
24*37a7bc39SJason Zhu
25*37a7bc39SJason Zhu #include <android_avb/avb_footer.h>
26*37a7bc39SJason Zhu #include <android_avb/avb_util.h>
27*37a7bc39SJason Zhu
avb_footer_validate_and_byteswap(const AvbFooter * src,AvbFooter * dest)28*37a7bc39SJason Zhu bool avb_footer_validate_and_byteswap(const AvbFooter* src, AvbFooter* dest) {
29*37a7bc39SJason Zhu avb_memcpy(dest, src, sizeof(AvbFooter));
30*37a7bc39SJason Zhu
31*37a7bc39SJason Zhu dest->version_major = avb_be32toh(dest->version_major);
32*37a7bc39SJason Zhu dest->version_minor = avb_be32toh(dest->version_minor);
33*37a7bc39SJason Zhu
34*37a7bc39SJason Zhu dest->original_image_size = avb_be64toh(dest->original_image_size);
35*37a7bc39SJason Zhu dest->vbmeta_offset = avb_be64toh(dest->vbmeta_offset);
36*37a7bc39SJason Zhu dest->vbmeta_size = avb_be64toh(dest->vbmeta_size);
37*37a7bc39SJason Zhu
38*37a7bc39SJason Zhu /* Check that magic is correct. */
39*37a7bc39SJason Zhu if (avb_safe_memcmp(dest->magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN) !=
40*37a7bc39SJason Zhu 0) {
41*37a7bc39SJason Zhu avb_error("Footer magic is incorrect.\n");
42*37a7bc39SJason Zhu return false;
43*37a7bc39SJason Zhu }
44*37a7bc39SJason Zhu
45*37a7bc39SJason Zhu /* Ensure we don't attempt to access any fields if the footer major
46*37a7bc39SJason Zhu * version is not supported.
47*37a7bc39SJason Zhu */
48*37a7bc39SJason Zhu if (dest->version_major > AVB_FOOTER_VERSION_MAJOR) {
49*37a7bc39SJason Zhu avb_error("No support for footer version.\n");
50*37a7bc39SJason Zhu return false;
51*37a7bc39SJason Zhu }
52*37a7bc39SJason Zhu
53*37a7bc39SJason Zhu return true;
54*37a7bc39SJason Zhu }
55