LibXR::CRC64 Class Reference

64 位循环冗余校验（CRC-64）计算类 / CRC-64 checksum computation class More...

#include <crc.hpp>

Static Public Member Functions
static void	GenerateTable ()
	生成 CRC64 查找表 / Generates the CRC64 lookup table
static LIBXR_FORCE_OPTIMIZE_O3 uint64_t	Calculate (const void *raw, size_t len)
	计算数据的 CRC64 校验码 / Computes the CRC64 checksum for the given data

Static Public Attributes
static uint64_t	tab_ [256]
	CRC64 查找表 / CRC64 lookup table.
static bool	inited_
	查找表是否已初始化 / Whether the lookup table is initialized

Static Private Attributes
static const uint64_t	INIT
	CRC64 初始值 / CRC64 initial value.

Detailed Description

64 位循环冗余校验（CRC-64）计算类 / CRC-64 checksum computation class

该类实现了 CRC-64 校验算法，支持计算数据的 64 位校验值。 This class implements the CRC-64 checksum algorithm and supports computing 64-bit checksums for input data.

Definition at line 308 of file crc.hpp.

Constructor & Destructor Documentation

CRC64()

LibXR::CRC64::CRC64 ( )

inline

Definition at line 319 of file crc.hpp.

{}

Member Function Documentation

Calculate()

static LIBXR_FORCE_OPTIMIZE_O3 uint64_t LibXR::CRC64::Calculate ( const void * raw, size_t len )

inlinestatic

计算数据的 CRC64 校验码 / Computes the CRC64 checksum for the given data

Parameters

raw	输入数据指针 / Pointer to input data
len	数据长度 / Length of the data

Returns

计算得到的 CRC64 值 / Computed CRC64 value

Definition at line 352 of file crc.hpp.

  {
    const uint8_t* buf = reinterpret_cast<const uint8_t*>(raw);
    if (!inited_)
    {
      GenerateTable();
    }
 
    uint64_t crc = INIT;
    while (len--)
    {
      crc = tab_[(crc ^ *buf++) & 0xff] ^ (crc >> 8U);
    }
    return crc;
  }

GenerateTable()

static void LibXR::CRC64::GenerateTable ( )

inlinestatic

生成 CRC64 查找表 / Generates the CRC64 lookup table

Definition at line 324 of file crc.hpp.

  {
    uint64_t crc = 0;
    for (int i = 0; i < 256; ++i)
    {
      crc = static_cast<uint64_t>(i);
      for (int j = 0; j < 8; ++j)
      {
        if (crc & 1ULL)
        {
          crc = (crc >> 1U) ^ 0xC96C5795D7870F42ULL;
        }
        else
        {
          crc >>= 1U;
        }
      }
      tab_[i] = crc;
    }
    inited_ = true;
  }

Field Documentation

INIT

const uint64_t LibXR::CRC64::INIT

staticprivate

Initial value:

=
      0xFFFFFFFFFFFFFFFFULL

CRC64 初始值 / CRC64 initial value.

Definition at line 311 of file crc.hpp.

inited_

bool LibXR::CRC64::inited_

inlinestatic

Initial value:

=
      false

查找表是否已初始化 / Whether the lookup table is initialized

Definition at line 316 of file crc.hpp.

tab_

uint64_t LibXR::CRC64::tab_[256]

inlinestatic

CRC64 查找表 / CRC64 lookup table.

Definition at line 315 of file crc.hpp.

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The documentation for this class was generated from the following file:

• src/utils/crc.hpp