/**
* \file lzma/check.h
* \brief Integrity checks
*
* \author Copyright (C) 1999-2006 Igor Pavlov
* \author Copyright (C) 2007 Lasse Collin
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#ifndef LZMA_H_INTERNAL
# error Never include this file directly. Use <lzma.h> instead.
#endif
/**
* \brief Type of the Check
*
* The .lzma format supports multiple types of Checks that are calculated
* from the uncompressed data (unless it is empty; then it's calculated
* from Block Header).
*/
typedef enum {
LZMA_CHECK_NONE = 0,
/**<
* No Check is calculated.
*
* Size of the Check field: 0 bytes
*/
LZMA_CHECK_CRC32 = 1,
/**<
* CRC32 using the polynomial from the IEEE 802.3 standard
*
* Size of the Check field: 4 bytes
*/
LZMA_CHECK_CRC64 = 4,
/**<
* CRC64 using the polynomial from the ECMA-182 standard
*
* Size of the Check field: 8 bytes
*/
LZMA_CHECK_SHA256 = 10
/**<
* SHA-256
*
* Size of the Check field: 32 bytes
*/
} lzma_check_type;
/**
* \brief Maximum valid Check ID
*
* The .lzma file format specification specifies eight Check IDs (0-15). Some
* of them are only reserved i.e. no actual Check algorithm has been assigned.
* Still liblzma accepts any of these eight IDs for future compatibility
* when decoding files. If a valid but unsupported Check ID is detected,
* liblzma indicates a warning with LZMA_UNSUPPORTED_CHECK.
*
* FIXME bad desc
*/
#define LZMA_CHECK_ID_MAX 15
/**
* \brief Check IDs supported by this liblzma build
*
* If lzma_available_checks[n] is true, the Check ID n is supported by this
* liblzma build. You can assume that LZMA_CHECK_NONE and LZMA_CHECK_CRC32
* are always available.
*/
extern const lzma_bool lzma_available_checks[LZMA_CHECK_ID_MAX + 1];
/**
* \brief Size of the Check field with different Check IDs
*
* Although not all Check IDs have a check algorithm associated, the size of
* every Check is already frozen. This array contains the size (in bytes) of
* the Check field with specified Check ID. The values are taken from the
* section 2.1.1.2 of the .lzma file format specification:
* { 0, 4, 4, 4, 8, 8, 8, 16, 16, 16, 32, 32, 32, 64, 64, 64 }
*/
extern const uint32_t lzma_check_sizes[LZMA_CHECK_ID_MAX + 1];
/**
* \brief Maximum size of a Check field
*/
#define LZMA_CHECK_SIZE_MAX 64
/**
* \brief Calculate CRC32
*
* Calculates CRC32 using the polynomial from the IEEE 802.3 standard.
*
* \param buf Pointer to the input buffer
* \param size Size of the input buffer
* \param crc Previously returned CRC value. This is used to
* calculate the CRC of a big buffer in smaller chunks.
* Set to zero when there is no previous value.
*
* \return Updated CRC value, which can be passed to this function
* again to continue CRC calculation.
*/
extern uint32_t lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc);
/**
* \brief Calculate CRC64
*
* Calculates CRC64 using the polynomial from the ECMA-182 standard.
*
* This function is used similarly to lzma_crc32(). See its documentation.
*/
extern uint64_t lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc);
/*
* SHA256 functions are currently not exported to public API.
* Contact the author if you think it should be.
*/
