blob: b8b8211501d9d09380ee34c15e25554f90b03a82
| 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person |
| 5 | * obtaining a copy of this software and associated documentation |
| 6 | * files (the "Software"), to deal in the Software without |
| 7 | * restriction, including without limitation the rights to use, copy, |
| 8 | * modify, merge, publish, distribute, sublicense, and/or sell copies |
| 9 | * of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 18 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 19 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 20 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 21 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | * SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include "avb_footer.h" |
| 26 | #include "avb_util.h" |
| 27 | |
| 28 | bool avb_footer_validate_and_byteswap(const AvbFooter* src, AvbFooter* dest) { |
| 29 | avb_memcpy(dest, src, sizeof(AvbFooter)); |
| 30 | |
| 31 | dest->version_major = avb_be32toh(dest->version_major); |
| 32 | dest->version_minor = avb_be32toh(dest->version_minor); |
| 33 | |
| 34 | dest->original_image_size = avb_be64toh(dest->original_image_size); |
| 35 | dest->vbmeta_offset = avb_be64toh(dest->vbmeta_offset); |
| 36 | dest->vbmeta_size = avb_be64toh(dest->vbmeta_size); |
| 37 | |
| 38 | /* Check that magic is correct. */ |
| 39 | if (avb_safe_memcmp(dest->magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN) != |
| 40 | 0) { |
| 41 | avb_error("Footer magic is incorrect.\n"); |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | /* Ensure we don't attempt to access any fields if the footer major |
| 46 | * version is not supported. |
| 47 | */ |
| 48 | if (dest->version_major > AVB_FOOTER_VERSION_MAJOR) { |
| 49 | avb_error("No support for footer version.\n"); |
| 50 | return false; |
| 51 | } |
| 52 | |
| 53 | return true; |
| 54 | } |
| 55 |