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.


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().


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(), end_frame(), and framecrc_write_packet().


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