1 /*
2 *
3 * Copyright (C) 2015 The ChromiumOS Authors. All rights reserved.
4 * written by Daisuke Nojiri <[email protected]>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef __ARCHIVE_H
31 #define __ARCHIVE_H
32
33 #include <stdint.h>
34
35 /*
36 * Archive file layout:
37 *
38 * +----------------------------------+
39 * | root header |
40 * +----------------------------------+
41 * | file_header[0] |
42 * +----------------------------------+
43 * | file_header[1] |
44 * +----------------------------------+
45 * | ... |
46 * +----------------------------------+
47 * | file_header[count-1] |
48 * +----------------------------------+
49 * | file(0) content |
50 * +----------------------------------+
51 * | file(1) content |
52 * +----------------------------------+
53 * | ... |
54 * +----------------------------------+
55 * | file(count-1) content |
56 * +----------------------------------+
57 */
58
59 #define VERSION 0
60 #define CBAR_MAGIC "CBAR"
61 #define NAME_LENGTH 32
62
63 /* Root header */
64 struct directory {
65 char magic[4];
66 uint32_t version; /* version of the header. little endian */
67 uint32_t size; /* total size of archive. little endian */
68 uint32_t count; /* number of files. little endian */
69 };
70
71 /* File header */
72 struct dentry {
73 /* file name. null-terminated if shorter than NAME_LENGTH */
74 char name[NAME_LENGTH];
75 /* file offset from the root header. little endian */
76 uint32_t offset;
77 /* file size. little endian */
78 uint32_t size;
79 };
80
get_first_dentry(const struct directory * dir)81 static inline struct dentry *get_first_dentry(const struct directory *dir)
82 {
83 return (struct dentry *)(dir + 1);
84 }
85
get_first_offset(const struct directory * dir)86 static inline uint32_t get_first_offset(const struct directory *dir)
87 {
88 return sizeof(struct directory) + sizeof(struct dentry) * dir->count;
89 }
90
91 #endif
92