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62 lines
1.4 KiB
62 lines
1.4 KiB
/* |
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* Definitions for handling the .xz file format |
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* |
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* Author: Lasse Collin <[email protected]> |
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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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