GrayLib::cCRC32Table Class Reference

#include <cCRC.h>

Public Member Functions
	cCRC32Table ()
	~cCRC32Table ()
void	BuildTable (CRC32_t nPoly=k_nPolynomial)
CRC32_t	CalculateBufferCRC (const void *pInput, size_t nInputSize, CRC32_t nCrc=k_nStart) const
	UNITTEST_FRIEND (cCRC)

Public Attributes
cArrayVal< CRC32_t >	m_CRCTable
	working CRC lookup table. [ 256 ] More...

Static Public Attributes
static const cCRC32Table	k_Def
	default instance. More...
static const CRC32_t	k_nStart = 0xFFFFFFFFUL
	Default starting value for CRC. More...
static const CRC32_t	k_nPolynomial = 0xEDB88320UL
	Default polynomial used for ZIP files. More...

Detailed Description

Singleton table to create 32 bit CRC's the same as ZIP files.

Constructor & Destructor Documentation

cCRC32Table()

GrayLib::cCRC32Table::cCRC32Table

(

)

~cCRC32Table()

GrayLib::cCRC32Table::~cCRC32Table

(

)

Member Function Documentation

BuildTable()

void GrayLib::cCRC32Table::BuildTable

(

CRC32_t

nPoly = k_nPolynomial

)

build my CRC32 lookup table based on a starting polynomial. nPoly = cCRC32Table::k_nPolynomial

CalculateBufferCRC()

CRC32_t GrayLib::cCRC32Table::CalculateBufferCRC	(	const void *	pInput,
		size_t	nInputSize,
		CRC32_t	nCrc = k_nStart
	)		const

calculates the CRC for a block of data using the table lookup method.

• nCRC = original value for the nCRC,

  Returns

  the updated nCRC value.

UNITTEST_FRIEND()

GrayLib::cCRC32Table::UNITTEST_FRIEND

(

cCRC

)

Member Data Documentation

k_Def

const cCRC32Table GrayLib::cCRC32Table::k_Def

static

default instance.

k_nPolynomial

const CRC32_t GrayLib::cCRC32Table::k_nPolynomial = 0xEDB88320UL

static

Default polynomial used for ZIP files.

k_nStart

const CRC32_t GrayLib::cCRC32Table::k_nStart = 0xFFFFFFFFUL

static

Default starting value for CRC.

m_CRCTable

cArrayVal<CRC32_t> GrayLib::cCRC32Table::m_CRCTable

working CRC lookup table. [ 256 ]

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

• c:/Dennis/Source/Gray/GrayLib/include/Hash/cCRC.h
• c:/Dennis/Source/Gray/GrayLib/src/Hash/cCRC.cpp