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