mirror of https://gitee.com/openkylin/linux.git
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
/*
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* Definitions for handling the .xz file format
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*
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* Author: Lasse Collin <lasse.collin@tukaani.org>
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*
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* This file has been put into the public domain.
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* You can do whatever you want with this file.
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*/
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#ifndef XZ_STREAM_H
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#define XZ_STREAM_H
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#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
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# include <linux/crc32.h>
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# undef crc32
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# define xz_crc32(buf, size, crc) \
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(~crc32_le(~(uint32_t)(crc), buf, size))
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#endif
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/*
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* See the .xz file format specification at
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* https://tukaani.org/xz/xz-file-format.txt
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* to understand the container format.
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*/
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#define STREAM_HEADER_SIZE 12
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#define HEADER_MAGIC "\3757zXZ"
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#define HEADER_MAGIC_SIZE 6
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#define FOOTER_MAGIC "YZ"
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#define FOOTER_MAGIC_SIZE 2
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/*
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* Variable-length integer can hold a 63-bit unsigned integer or a special
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* value indicating that the value is unknown.
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*
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* Experimental: vli_type can be defined to uint32_t to save a few bytes
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* in code size (no effect on speed). Doing so limits the uncompressed and
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* compressed size of the file to less than 256 MiB and may also weaken
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* error detection slightly.
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*/
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typedef uint64_t vli_type;
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#define VLI_MAX ((vli_type)-1 / 2)
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#define VLI_UNKNOWN ((vli_type)-1)
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/* Maximum encoded size of a VLI */
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#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
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/* Integrity Check types */
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enum xz_check {
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XZ_CHECK_NONE = 0,
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XZ_CHECK_CRC32 = 1,
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XZ_CHECK_CRC64 = 4,
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XZ_CHECK_SHA256 = 10
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};
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/* Maximum possible Check ID */
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#define XZ_CHECK_MAX 15
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#endif
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