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150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/**
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* \file lzma/check.h
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* \brief Integrity checks
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*/
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/*
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* Author: Lasse Collin
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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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* See ../lzma.h for information about liblzma as a whole.
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*/
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#ifndef LZMA_H_INTERNAL
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# error Never include this file directly. Use <lzma.h> instead.
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#endif
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/**
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* \brief Type of the integrity check (Check ID)
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*
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* The .xz format supports multiple types of checks that are calculated
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* from the uncompressed data. They vary in both speed and ability to
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* detect errors.
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*/
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typedef enum {
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LZMA_CHECK_NONE = 0,
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/**<
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* No Check is calculated.
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*
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* Size of the Check field: 0 bytes
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*/
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LZMA_CHECK_CRC32 = 1,
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/**<
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* CRC32 using the polynomial from the IEEE 802.3 standard
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*
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* Size of the Check field: 4 bytes
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*/
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LZMA_CHECK_CRC64 = 4,
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/**<
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* CRC64 using the polynomial from the ECMA-182 standard
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*
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* Size of the Check field: 8 bytes
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*/
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LZMA_CHECK_SHA256 = 10
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/**<
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* SHA-256
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*
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* Size of the Check field: 32 bytes
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*/
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} lzma_check;
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/**
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* \brief Maximum valid Check ID
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*
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* The .xz file format specification specifies 16 Check IDs (0-15). Some
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* of them are only reserved, that is, no actual Check algorithm has been
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* assigned. When decoding, liblzma still accepts unknown Check IDs for
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* future compatibility. If a valid but unsupported Check ID is detected,
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* liblzma can indicate a warning; see the flags LZMA_TELL_NO_CHECK,
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* LZMA_TELL_UNSUPPORTED_CHECK, and LZMA_TELL_ANY_CHECK in container.h.
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*/
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#define LZMA_CHECK_ID_MAX 15
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/**
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* \brief Test if the given Check ID is supported
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*
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* Return true if the given Check ID is supported by this liblzma build.
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* Otherwise false is returned. It is safe to call this with a value that
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* is not in the range [0, 15]; in that case the return value is always false.
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*
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* You can assume that LZMA_CHECK_NONE and LZMA_CHECK_CRC32 are always
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* supported (even if liblzma is built with limited features).
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*/
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extern LZMA_API(lzma_bool) lzma_check_is_supported(lzma_check check)
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lzma_nothrow lzma_attr_const;
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/**
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* \brief Get the size of the Check field with the given Check ID
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*
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* Although not all Check IDs have a check algorithm associated, the size of
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* every Check is already frozen. This function returns the size (in bytes) of
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* the Check field with the specified Check ID. The values are:
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* { 0, 4, 4, 4, 8, 8, 8, 16, 16, 16, 32, 32, 32, 64, 64, 64 }
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*
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* If the argument is not in the range [0, 15], UINT32_MAX is returned.
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*/
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extern LZMA_API(uint32_t) lzma_check_size(lzma_check check)
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lzma_nothrow lzma_attr_const;
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/**
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* \brief Maximum size of a Check field
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*/
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#define LZMA_CHECK_SIZE_MAX 64
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/**
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* \brief Calculate CRC32
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*
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* Calculate CRC32 using the polynomial from the IEEE 802.3 standard.
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*
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* \param buf Pointer to the input buffer
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* \param size Size of the input buffer
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* \param crc Previously returned CRC value. This is used to
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* calculate the CRC of a big buffer in smaller chunks.
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* Set to zero when starting a new calculation.
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*
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* \return Updated CRC value, which can be passed to this function
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* again to continue CRC calculation.
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*/
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extern LZMA_API(uint32_t) lzma_crc32(
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const uint8_t *buf, size_t size, uint32_t crc)
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lzma_nothrow lzma_attr_pure;
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/**
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* \brief Calculate CRC64
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*
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* Calculate CRC64 using the polynomial from the ECMA-182 standard.
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*
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* This function is used similarly to lzma_crc32(). See its documentation.
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*/
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extern LZMA_API(uint64_t) lzma_crc64(
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const uint8_t *buf, size_t size, uint64_t crc)
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lzma_nothrow lzma_attr_pure;
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/*
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* SHA-256 functions are currently not exported to public API.
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* Contact Lasse Collin if you think it should be.
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*/
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/**
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* \brief Get the type of the integrity check
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*
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* This function can be called only immediately after lzma_code() has
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* returned LZMA_NO_CHECK, LZMA_UNSUPPORTED_CHECK, or LZMA_GET_CHECK.
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* Calling this function in any other situation has undefined behavior.
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*/
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extern LZMA_API(lzma_check) lzma_get_check(const lzma_stream *strm)
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lzma_nothrow;
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