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1 /* Copyright 2010, Google Inc. | |
2 * All rights reserved. | |
3 * | |
4 * Redistribution and use in source and binary forms, with or without | |
5 * modification, are permitted provided that the following conditions are | |
6 * met: | |
7 * | |
8 * * Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * * Redistributions in binary form must reproduce the above | |
11 * copyright notice, this list of conditions and the following disclaimer | |
12 * in the documentation and/or other materials provided with the | |
13 * distribution. | |
14 * * Neither the name of Google Inc. nor the names of its | |
15 * contributors may be used to endorse or promote products derived from | |
16 * this software without specific prior written permission. | |
17 * | |
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
29 * | |
30 * Alternatively, this software may be distributed under the terms of the | |
31 * GNU General Public License ("GPL") version 2 as published by the Free | |
32 * Software Foundation. | |
33 * | |
34 * This is ported from the flashmap utility: http://flashmap.googlecode.com | |
35 */ | |
36 | |
37 #include <stdlib.h> | |
38 #include <string.h> | |
39 | |
40 #include "flash.h" /* for ARRAY_SIZE macro */ | |
41 #include "fmap.h" | |
42 | |
43 long int fmap_find(const uint8_t *image, size_t image_len) | |
44 { | |
45 long int offset = -1; | |
46 uint64_t sig; | |
47 unsigned int strides[] = { 64, 4 }; | |
48 int i; | |
49 | |
50 memcpy(&sig, FMAP_SIGNATURE, strlen(FMAP_SIGNATURE)); | |
51 | |
52 /* | |
53 * Find FMAP signature within image. The alignment requirements | |
54 * increased over time due to speed concerns, so we'll try using more | |
55 * coarse alignments to start with and fall back to smaller ones only | |
56 * if necessary. | |
57 */ | |
58 for (i = 0; i < ARRAY_SIZE(strides); i++) { | |
59 for (offset = 0; offset < image_len; offset += strides[i]) { | |
Louis
2010/12/30 02:57:08
; offset + sizeof(sig) <= image_len;
dhendrix
2010/12/31 00:47:02
good catch -- done
| |
60 if (!memcmp(&image[offset], &sig, sizeof(sig))) { | |
61 goto fmap_find_exit; | |
62 } | |
63 } | |
64 } | |
65 | |
66 fmap_find_exit: | |
67 if (offset < image_len) | |
Louis
2010/12/30 02:57:08
if (offset + sizeof(sig) <= image_len)
dhendrix
2010/12/31 00:47:02
Done.
| |
68 return offset; | |
69 else | |
70 return -1; | |
71 } | |
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