LibXR::CRC8 Class Reference

8 位循环冗余校验（CRC-8）计算类 / CRC-8 checksum computation class More...

#include <crc.hpp>

Static Public Member Functions
static void	GenerateTable ()
	生成 CRC8 查找表 / Generates the CRC8 lookup table
static uint8_t	Calculate (const void *raw, size_t len)
	计算数据的 CRC8 校验码 / Computes the CRC8 checksum for the given data
static bool	Verify (const void *raw, size_t len)
	验证数据的 CRC8 校验码 / Verifies the CRC8 checksum of the given data

Static Public Attributes
static uint8_t	tab_ [256]
	CRC8 查找表 / CRC8 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 uint8_t	INIT = 0xFF
	CRC8 初始值 / CRC8 initial value.

Detailed Description

8 位循环冗余校验（CRC-8）计算类 / CRC-8 checksum computation class

该类实现了 CRC-8 校验算法，支持计算和验证数据的 CRC8 校验码。 This class implements the CRC-8 checksum algorithm, supporting computation and verification.

Definition at line 16 of file crc.hpp.

Constructor & Destructor Documentation

CRC8()

LibXR::CRC8::CRC8 ( )

inline

Definition at line 26 of file crc.hpp.

{}

Member Function Documentation

Calculate()

static uint8_t LibXR::CRC8::Calculate ( const void * raw, size_t len )

inlinestatic

计算数据的 CRC8 校验码 / Computes the CRC8 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 CRC8 值 / Computed CRC8 value

Definition at line 66 of file crc.hpp.

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

GenerateTable()

static void LibXR::CRC8::GenerateTable ( )

inlinestatic

生成 CRC8 查找表 / Generates the CRC8 lookup table

Definition at line 31 of file crc.hpp.

  {
    uint8_t crc = 0;
 
    for (int i = 0; i < 256; i++)
    {
      tab_[i] = i;
    }
 
    for (int i = 0; i < 256; i++)
    {
      for (int j = 7; j >= 0; j--)
      {
        crc = tab_[i] & 0x01;
 
        if (crc)
        {
          tab_[i] = tab_[i] >> 1;
          tab_[i] ^= 0x8c;
        }
        else
        {
          tab_[i] = tab_[i] >> 1;
        }
      }
    }
    inited_ = true;
  }

Verify()

static bool LibXR::CRC8::Verify ( const void * raw, size_t len )

inlinestatic

验证数据的 CRC8 校验码 / Verifies the CRC8 checksum of 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

校验成功返回 true，否则返回 false / Returns true if the checksum is valid, otherwise returns false

Definition at line 91 of file crc.hpp.

  {
    const uint8_t *buf = reinterpret_cast<const uint8_t *>(raw);
    if (!inited_)
    {
      GenerateTable();
    }
 
    if (len < 2)
    {
      return false;
    }
    uint8_t expected = Calculate(buf, len - sizeof(uint8_t));
    return expected == buf[len - sizeof(uint8_t)];
  }

Field Documentation

INIT

const uint8_t LibXR::CRC8::INIT = 0xFF

staticprivate

CRC8 初始值 / CRC8 initial value.

Definition at line 19 of file crc.hpp.

inited_

bool LibXR::CRC8::inited_

inlinestatic

Initial value:

=
      false

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

Definition at line 23 of file crc.hpp.

tab_

uint8_t LibXR::CRC8::tab_[256]

inlinestatic

CRC8 查找表 / CRC8 lookup table.

Definition at line 22 of file crc.hpp.

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

• src/utils/crc.hpp