/usr/include/isa-l/crc.h is in libisal-dev 2.21.0-1.
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Copyright(c) 2011-2015 Intel Corporation All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
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* Redistributions in binary form must reproduce the above copyright
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/**
* @file crc.h
* @brief CRC functions.
*/
#ifndef _CRC_H_
#define _CRC_H_
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/* Multi-binary functions */
/**
* @brief Generate CRC from the T10 standard, runs appropriate version.
*
* This function determines what instruction sets are enabled and
* selects the appropriate version at runtime.
*
* @returns 16 bit CRC
*/
uint16_t crc16_t10dif(
uint16_t init_crc, //!< initial CRC value, 16 bits
const unsigned char *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate CRC and copy T10 standard, runs appropriate version.
*
* Stitched CRC + copy function.
*
* @returns 16 bit CRC
*/
uint16_t crc16_t10dif_copy(
uint16_t init_crc, //!< initial CRC value, 16 bits
uint8_t *dst, //!< buffer destination for copy
uint8_t *src, //!< buffer source to crc + copy
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate CRC from the IEEE standard, runs appropriate version.
*
* This function determines what instruction sets are enabled and
* selects the appropriate version at runtime.
* Note: CRC32 IEEE standard is widely used in HDLC, Ethernet, Gzip and
* many others. Its polynomial is 0x04C11DB7 in normal and 0xEDB88320
* in reflection (or reverse). In ISA-L CRC, function crc32_ieee is
* actually designed for normal CRC32 IEEE version. And function
* crc32_gzip_refl is actually designed for reflected CRC32 IEEE.
* These two versions of CRC32 IEEE are not compatible with each other.
* Users who want to replace their not optimized crc32 ieee with ISA-L's
* crc32 function should be careful of that.
* Since many applications use CRC32 IEEE reflected version, Please have
* a check whether crc32_gzip_refl is right one for you instead of
* crc32_ieee.
*
* @returns 32 bit CRC
*/
uint32_t crc32_ieee(
uint32_t init_crc, //!< initial CRC value, 32 bits
const unsigned char *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate the customized CRC
* based on RFC 1952 CRC (http://www.ietf.org/rfc/rfc1952.txt) standard,
* runs appropriate version.
*
* This function determines what instruction sets are enabled and
* selects the appropriate version at runtime.
*
* Note: CRC32 IEEE standard is widely used in HDLC, Ethernet, Gzip and
* many others. Its polynomial is 0x04C11DB7 in normal and 0xEDB88320
* in reflection (or reverse). In ISA-L CRC, function crc32_ieee is
* actually designed for normal CRC32 IEEE version. And function
* crc32_gzip_refl is actually designed for reflected CRC32 IEEE.
* These two versions of CRC32 IEEE are not compatible with each other.
* Users who want to replace their not optimized crc32 ieee with ISA-L's
* crc32 function should be careful of that.
* Since many applications use CRC32 IEEE reflected version, Please have
* a check whether crc32_gzip_refl is right one for you instead of
* crc32_ieee.
*
* @returns 32 bit CRC
*/
uint32_t crc32_gzip_refl(
uint32_t init_crc, //!< initial CRC value, 32 bits
const unsigned char *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief ISCSI CRC function, runs appropriate version.
*
* This function determines what instruction sets are enabled and
* selects the appropriate version at runtime.
*
* @returns 32 bit CRC
*/
unsigned int crc32_iscsi(
unsigned char *buffer, //!< buffer to calculate CRC on
int len, //!< buffer length in bytes
unsigned int init_crc //!< initial CRC value
);
/* Base functions */
/**
* @brief ISCSI CRC function, baseline version
* @returns 32 bit CRC
*/
unsigned int crc32_iscsi_base(
unsigned char *buffer, //!< buffer to calculate CRC on
int len, //!< buffer length in bytes
unsigned int crc_init //!< initial CRC value
);
/**
* @brief Generate CRC from the T10 standard, runs baseline version
* @returns 16 bit CRC
*/
uint16_t crc16_t10dif_base(
uint16_t seed, //!< initial CRC value, 16 bits
uint8_t *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate CRC and copy T10 standard, runs baseline version.
* @returns 16 bit CRC
*/
uint16_t crc16_t10dif_copy_base(
uint16_t init_crc, //!< initial CRC value, 16 bits
uint8_t *dst, //!< buffer destination for copy
uint8_t *src, //!< buffer source to crc + copy
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate CRC from the IEEE standard, runs baseline version
* @returns 32 bit CRC
*/
uint32_t crc32_ieee_base(
uint32_t seed, //!< initial CRC value, 32 bits
uint8_t *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
/**
* @brief Generate the customized CRC
* based on RFC 1952 CRC (http://www.ietf.org/rfc/rfc1952.txt) standard,
* runs baseline version
* @returns 32 bit CRC
*/
uint32_t crc32_gzip_refl_base(
uint32_t seed, //!< initial CRC value, 32 bits
uint8_t *buf, //!< buffer to calculate CRC on
uint64_t len //!< buffer length in bytes (64-bit data)
);
#ifdef __cplusplus
}
#endif
#endif // _CRC_H_
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