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
