Implementation of CRC32 checksum. More...

#include <arc/CheckSum.h>

Inheritance diagram for Arc::CRC32Sum:

Public Member Functions
virtual void	start (void)
	Initiate the checksum algorithm. More...

virtual void	add (void *buf, unsigned long long int len)
	Add data to be checksummed. More...

virtual void	end (void)
	Finalize the checksumming. More...

virtual void	result (unsigned char *&res, unsigned int &len) const
	Retrieve result of checksum as binary blob. More...

virtual int	print (char *buf, int len) const
	Retrieve result of checksum into a string. More...

virtual void	scan (const char *buf)
	Set internal checksum state. More...

virtual	operator bool (void) const
	Indicates whether the checksum has been calculated. More...

virtual bool	operator! (void) const
	Indicates whether the checksum has not been calculated. More...

uint32_t	crc (void) const

Public Member Functions inherited from Arc::CheckSum
	CheckSum (void)
	Default constructor. More...

Detailed Description

Implementation of CRC32 checksum.

This class is a specialized class of the CheckSum class. It provides an implementation for the CRC-32 IEEE 802.3 standard.

Member Function Documentation

virtual void Arc::CRC32Sum::add	(	void *	buf,
		unsigned long long int	len
	)

virtual

Add data to be checksummed.

This method calculates the checksum of the passed data chunk, taking into account the previous state of this object.

Parameters

buf	pointer to data chuck to be checksummed.
len	size of the data chuck.

Implements Arc::CheckSum.

virtual void Arc::CRC32Sum::end ( void )

virtual

Finalize the checksumming.

This method finalizes the checksum algorithm, that is calculating the final checksum result.

Implements Arc::CheckSum.

virtual Arc::CRC32Sum::operator bool ( void ) const

inlinevirtual

Indicates whether the checksum has been calculated.

Reimplemented from Arc::CheckSum.

virtual bool Arc::CRC32Sum::operator! ( void ) const

inlinevirtual

Indicates whether the checksum has not been calculated.

Reimplemented from Arc::CheckSum.

virtual int Arc::CRC32Sum::print	(	char *	buf,
		int	len
	)		const

virtual

Retrieve result of checksum into a string.

The passed string buf is filled with result of checksum algorithm in base 16. At most len characters are filled into buffer buf. The hexadecimal value is prepended with "algorithm:", where algorithm is one of "cksum", "md5" or "adler32" respectively corresponding to the result from the CRC32Sum, MD5Sum and Adler32 classes.

Parameters

buf	pointer to buffer which should be filled with checksum result.
len	max number of character filled into buffer.

Returns: 0 on success

Reimplemented from Arc::CheckSum.

virtual void Arc::CRC32Sum::result	(	unsigned char *&	res,
		unsigned int &	len
	)		const

inlinevirtual

Retrieve result of checksum as binary blob.

Implements Arc::CheckSum.

virtual void Arc::CRC32Sum::scan ( const char * buf )

virtual

Set internal checksum state.

This method sets the internal state to that of the passed textual representation. The format passed to this method must be the same as retrieved from the CheckSum::print method.

Parameters

buf	string containing textual representation of checksum

See Also: CheckSum::print

Implements Arc::CheckSum.

virtual void Arc::CRC32Sum::start ( void )

virtual

Initiate the checksum algorithm.

This method must be called before starting a new checksum calculation.

Implements Arc::CheckSum.

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

CheckSum.h

Public Member Functions

Detailed Description

Member Function Documentation