crc.c File Reference

(v16)

Sample Cyclic Redundancy Code implementation More...

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Functions
void	make_crc_table (void)
unsigned long	update_crc (unsigned long crc, const unsigned char *buf, int len)
unsigned long	crc (const unsigned char *buf, int len)
	Compute CRC (cyclic redundancy code) as specified by PNG.

Variables
unsigned long	crc_table [256]
int	crc_table_computed = 0

Detailed Description

Sample Cyclic Redundancy Code implementation

Copyright

Copyright © 2003 World Wide Web Consortium, (Massachusetts Institute of Technology, European Research Consortium for Informatics and Mathematics, Keio University, Beihang). All Rights Reserved. This work is distributed under the W3C^® Software License in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. W3C Software Notice and License

Definition in file crc.c.

Function Documentation

unsigned long crc	(	const unsigned char *	buf,
		int	len
	)

Compute CRC (cyclic redundancy code) as specified by PNG.

Parameters

buf	The data to checksum.
len	The length of the data.

Returns

The CRC value.

Definition at line 69 of file crc.c.

References update_crc().

Referenced by parse_png(), png_iTXt(), and update_crc().

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void make_crc_table

(

void

)

Definition at line 27 of file crc.c.

References crc_table, and crc_table_computed.

Referenced by update_crc().

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unsigned long update_crc	(	unsigned long	crc,
		const unsigned char *	buf,
		int	len
	)

Definition at line 52 of file crc.c.

References crc(), crc_table, crc_table_computed, and make_crc_table().

Referenced by crc().

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Variable Documentation

unsigned long crc_table[256]

Definition at line 21 of file crc.c.

Referenced by make_crc_table(), and update_crc().

int crc_table_computed = 0

Definition at line 24 of file crc.c.

Referenced by make_crc_table(), and update_crc().