libunarchive/unxz/xz_stream.h

/*
 * Definitions for handling the .xz file format
 *
 * Author: Lasse Collin <lasse.collin@tukaani.org>
 *
 * This file has been put into the public domain.
 * You can do whatever you want with this file.
 */

#ifndef XZ_STREAM_H
#define XZ_STREAM_H

#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
#	include <linux/crc32.h>
#	undef crc32
#	define xz_crc32(buf, size, crc) \
		(~crc32_le(~(uint32_t)(crc), buf, size))
#endif

/*
 * See the .xz file format specification at
 * http://tukaani.org/xz/xz-file-format.txt
 * to understand the container format.
 */

#define STREAM_HEADER_SIZE 12

#define HEADER_MAGIC "\3757zXZ\0"
#define HEADER_MAGIC_SIZE 6

#define FOOTER_MAGIC "YZ"
#define FOOTER_MAGIC_SIZE 2

/*
 * Variable-length integer can hold a 63-bit unsigned integer, or a special
 * value to indicate that the value is unknown.
 */
typedef uint64_t vli_type;

#define VLI_MAX ((vli_type)-1 / 2)
#define VLI_UNKNOWN ((vli_type)-1)

/* Maximum encoded size of a VLI */
#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)

/* Integrity Check types */
enum xz_check {
	XZ_CHECK_NONE = 0,
	XZ_CHECK_CRC32 = 1,
	XZ_CHECK_CRC64 = 4,
	XZ_CHECK_SHA256 = 10
};

/* Maximum possible Check ID */
#define XZ_CHECK_MAX 15

#endif
1	/*
2	* Definitions for handling the .xz file format
3	*
4	* Author: Lasse Collin <lasse.collin@tukaani.org>
5	*
6	* This file has been put into the public domain.
7	* You can do whatever you want with this file.
8	*/
9
10	#ifndef XZ_STREAM_H
11	#define XZ_STREAM_H
12
13	#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
14	# include <linux/crc32.h>
15	# undef crc32
16	# define xz_crc32(buf, size, crc) \
17	(~crc32_le(~(uint32_t)(crc), buf, size))
18	#endif
19
20	/*
21	* See the .xz file format specification at
22	* http://tukaani.org/xz/xz-file-format.txt
23	* to understand the container format.
24	*/
25
26	#define STREAM_HEADER_SIZE 12
27
28	#define HEADER_MAGIC "\3757zXZ\0"
29	#define HEADER_MAGIC_SIZE 6
30
31	#define FOOTER_MAGIC "YZ"
32	#define FOOTER_MAGIC_SIZE 2
33
34	/*
35	* Variable-length integer can hold a 63-bit unsigned integer, or a special
36	* value to indicate that the value is unknown.
37	*/
38	typedef uint64_t vli_type;
39
40	#define VLI_MAX ((vli_type)-1 / 2)
41	#define VLI_UNKNOWN ((vli_type)-1)
42
43	/* Maximum encoded size of a VLI */
44	#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
45
46	/* Integrity Check types */
47	enum xz_check {
48	XZ_CHECK_NONE = 0,
49	XZ_CHECK_CRC32 = 1,
50	XZ_CHECK_CRC64 = 4,
51	XZ_CHECK_SHA256 = 10
52	};
53
54	/* Maximum possible Check ID */
55	#define XZ_CHECK_MAX 15
56
57	#endif