DeflateUpdate Hash

Performs LZ77 encoding according to the specified compression level.

Syntax

IppStatus ippsDeflateUpdateHash_8u(const Ipp8u* pSrc, Ipp32u srcIdx, Ipp32u srcLen, Ipp32s* pHashHeadDst, Ipp32u hashSize, Ipp32s* pHashPrevDst, Ipp32u winSize, int comprLevel);

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 vector.
srcIdx	Index of the current position in the source vector.
srcLen	Length of the source vector.
pHashHeadDst	Pointer to the table containing heads of the hash chains.
hashSize	Size of the pHashHeadDst table.
pHashPrevDst	Pointer to the table contating indexes to the previous strings with the same hash key.
winSize	Size of the sliding window and the pHashPrevDst table.
comprLevel	Compression level in range [0..9] in accordance with ZLIB.

Description

This function updates hash tables according to the source context.

The function parameter srcIdx - index of the current position in the source vector - is used to correlate the current position in the source vector and indexes in the hash tables. After processing each 2GB of source data, this index and hash tables must be normalized (instead of 64K of source data in ZLIB).

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error if one of the specified pointers is NULL.
ippStsSizeErr	Indicates an error if winSize is less than or equal to 256, or greater than 32768; or if hashSize is less than or equal to 256, or greater than 65536.