| /* |
| * Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include "fmap.h" |
| |
| /* Find and point to the FMAP header within the buffer */ |
| FmapHeader *fmap_find(uint8_t *ptr, size_t size) |
| { |
| size_t i; |
| FmapHeader *fmap_header; |
| size_t lim = size - sizeof(FmapHeader); |
| for (i = 0; |
| i <= lim; |
| i += FMAP_SEARCH_STRIDE, ptr += FMAP_SEARCH_STRIDE) { |
| if (0 != memcmp(ptr, FMAP_SIGNATURE, FMAP_SIGNATURE_SIZE)) |
| continue; |
| fmap_header = (FmapHeader *)ptr; |
| if (fmap_header->fmap_ver_major == FMAP_VER_MAJOR) |
| return fmap_header; |
| } |
| return NULL; |
| } |
| |
| /* Search for an area by name, return pointer to its beginning */ |
| uint8_t *fmap_find_by_name(uint8_t *ptr, size_t size, FmapHeader *fmap, |
| const char *name, FmapAreaHeader **ah_ptr) |
| { |
| int i; |
| FmapAreaHeader *ah; |
| |
| if (!fmap) |
| fmap = fmap_find(ptr, size); |
| if (!fmap) |
| return NULL; |
| |
| ah = (FmapAreaHeader*)((void *)fmap + sizeof(FmapHeader)); |
| for (i = 0; i < fmap->fmap_nareas; i++) |
| if (!strncmp(ah[i].area_name, name, FMAP_NAMELEN)) { |
| if (ah_ptr) |
| *ah_ptr = ah + i; |
| return ptr + ah[i].area_offset; |
| } |
| |
| return NULL; |
| } |
| |