1  /* SPDX-License-Identifier: GPL-2.0-only */
 2  
 3  #ifndef __ARCHIVE_H
 4  #define __ARCHIVE_H
 5  
 6  #include <stdint.h>
 7  
 8  /*
 9   * Archive file layout:
10   *
11   *  +----------------------------------+
12   *  |           root header            |
13   *  +----------------------------------+
14   *  |         file_header[0]           |
15   *  +----------------------------------+
16   *  |         file_header[1]           |
17   *  +----------------------------------+
18   *  |              ...                 |
19   *  +----------------------------------+
20   *  |         file_header[count-1]     |
21   *  +----------------------------------+
22   *  |         file(0) content          |
23   *  +----------------------------------+
24   *  |         file(1) content          |
25   *  +----------------------------------+
26   *  |              ...                 |
27   *  +----------------------------------+
28   *  |         file(count-1) content    |
29   *  +----------------------------------+
30   */
31  
32  #define VERSION		0
33  #define CBAR_MAGIC	"CBAR"
34  #define NAME_LENGTH	32
35  
36  /* Root header */
37  struct directory {
38  	char magic[4];
39  	uint32_t version;	/* version of the header. little endian */
40  	uint32_t size;		/* total size of archive. little endian */
41  	uint32_t count;		/* number of files. little endian */
42  };
43  
44  /* File header */
45  struct dentry {
46  	/* file name. null-terminated if shorter than NAME_LENGTH */
47  	char name[NAME_LENGTH];
48  	/* file offset from the root header. little endian */
49  	uint32_t offset;
50  	/* file size. little endian */
51  	uint32_t size;
52  };
53  
54  static inline struct dentry *get_first_dentry(const struct directory *dir)
55  {
56  	return (struct dentry *)(dir + 1);
57  }
58  
59  static inline uint32_t get_first_offset(const struct directory *dir)
60  {
61  	return sizeof(struct directory) + sizeof(struct dentry) * dir->count;
62  }
63  
64  #endif