libavutil/adler32.c File Reference

#include "config.h"
#include "adler32.h"

Go to the source code of this file.

Defines
#define	BASE   65521L
#define	DO1(buf)   {s1 += *buf++; s2 += s1;}
#define	DO4(buf)   DO1(buf); DO1(buf); DO1(buf); DO1(buf);
#define	DO16(buf)   DO4(buf); DO4(buf); DO4(buf); DO4(buf);
Functions
unsigned long	av_adler32_update (unsigned long adler, const uint8_t *buf, unsigned int len)
	Calculate the Adler32 checksum of a buffer.

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Define Documentation

#define BASE   65521L

Definition at line 27 of file adler32.c.

Referenced by av_adler32_update().

#define DO1

(

buf

)

{s1 += *buf++; s2 += s1;}

Definition at line 29 of file adler32.c.

Referenced by av_adler32_update().

#define DO16

(

buf

)

DO4(buf); DO4(buf); DO4(buf); DO4(buf);

Definition at line 31 of file adler32.c.

Referenced by av_adler32_update().

#define DO4

(

buf

)

DO1(buf); DO1(buf); DO1(buf); DO1(buf);

Definition at line 30 of file adler32.c.

Referenced by av_adler32_update().

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Function Documentation

unsigned long av_adler32_update	(	unsigned long	adler,
		const uint8_t *	buf,
		unsigned int	len
	)

Calculate the Adler32 checksum of a buffer.

Passing the return value to a subsequent av_adler32_update() call allows the checksum of multiple buffers to be calculated as though they were concatenated.

Parameters:

adler	initial checksum value
buf	pointer to input buffer
len	size of input buffer

Returns:

updated checksum

Definition at line 33 of file adler32.c.

Referenced by av_adler32_update(), crc_write_packet(), and framecrc_write_packet().