Adler32

Computes the Adler32 checksum for the source data buffer.

Syntax

IppStatus ippsAdler32_8u (const Ipp8u* pSrc, int srcLen, Ipp32u* pAdler32);

Include Files

ippdc.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib

Parameters

pSrc	Pointer to the source data buffer.
srcLen	Number of elements in the source data buffer.
pAdler32	Pointer to the checksum value.

Description

This function computes the checksum for srcLen elements of the source data buffer pSrc and stores it in the pAdler32. The checksum is computed using the Adler32 algorithm that is a modified version of the Fletcher algorithm [Flet82], [ITU224 ], [RFC1950].

You need to call the Adler32 function twice: once with a NULL/zero length buffer to prime the checksum to 1, then call it again to compute the checksum on the buffer.

You can use this function to compute the accumulated value of the checksum for multiple buffers in the data stream by specifying as an input parameter the checksum value obtained in the preceding function call.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error if the pSrc pointer is NULL.
ippStsSizeErr	Indicates an error if srcLen is less than or equal to 0.