2 * Definitions for handling the .xz file format
4 * Author: Lasse Collin <lasse.collin@tukaani.org>
6 * This file has been put into the public domain.
7 * You can do whatever you want with this file.
13 #if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
14 # include <linux/crc32.h>
16 # define xz_crc32(buf, size, crc) \
17 (~crc32_le(~(uint32_t)(crc), buf, size))
21 * See the .xz file format specification at
22 * http://tukaani.org/xz/xz-file-format.txt
23 * to understand the container format.
26 #define STREAM_HEADER_SIZE 12
28 #define HEADER_MAGIC "\3757zXZ\0"
29 #define HEADER_MAGIC_SIZE 6
31 #define FOOTER_MAGIC "YZ"
32 #define FOOTER_MAGIC_SIZE 2
35 * Variable-length integer can hold a 63-bit unsigned integer, or a special
36 * value to indicate that the value is unknown.
38 typedef uint64_t vli_type;
40 #define VLI_MAX ((vli_type)-1 / 2)
41 #define VLI_UNKNOWN ((vli_type)-1)
43 /* Maximum encoded size of a VLI */
44 #define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
46 /* Integrity Check types */
54 /* Maximum possible Check ID */
55 #define XZ_CHECK_MAX 15