Arc::CRC32Sum Class Reference

Implementation of CRC32 checksum. More...

#include <CheckSum.h>

Inheritance diagram for Arc::CRC32Sum:

Public Member Functions
virtual void	start (void)
virtual void	add (void *buf, unsigned long long int len)
virtual void	end (void)
virtual void	result (unsigned char *&res, unsigned int &len) const
virtual int	print (char *buf, int len) const
virtual void	scan (const char *buf)
virtual	operator bool (void) const
virtual bool	operator! (void) const

---

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 chuck, 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 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 chacters is 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.

Reimplemented from 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 textural representation. The format passed to this method must be the same as retrieved from the CheckSum::print method.

Parameters:

buf

string containing textural 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