Visible to Intel only — GUID: GUID-D4CA603A-3F44-4A17-A765-9D01FA643662
Visible to Intel only — GUID: GUID-D4CA603A-3F44-4A17-A765-9D01FA643662
DeflateLZ77Fastest
Performs LZ77 encoding according to the fastest algorithm.
Syntax
IppStatus ippsDeflateLZ77Fastest_8u(const Ipp8u** ppSrc, Ipp32u* pSrcLen, Ipp32u* pSrcIdx, const Ipp8u* pWindow, Ipp32u winSize, Ipp32s* pHashHead, Ipp32u hashSize, Ipp16u* pCode, Ipp32u* pCodeLenBits, Ipp8u* pDst, Ipp32u dstLen, Ipp32u* pDstIdx, IppDeflateHuffCode pLitHuffCodes[286], IppDeflateHuffCode pDistHuffCodes[30], IppLZ77Flush flush);
Include Files
ippdc.h
Domain Dependencies
Headers: ippcore.h, ippvm.h, ipps.h
Libraries: ippcore.lib, ippvm.lib, ipps.lib
Parameters
ppSrc |
Double pointer to the source vector. |
pSrcLen |
Pointer to the length of the source vector. |
pSrcIdx |
Pointer to the index of the current position in the source vector. |
pWindow |
Pointer to the sliding window (the dictionary for the LZ77 algorithm). |
winSize |
Size of the sliding window and the pHashPrev table. |
pHashHead |
Pointer to the table containing heads of the hash chains. |
hashSize |
Size of the pHashHead table. |
pCode |
Pointer to the bit buffer. |
pCodeLenBits |
Pointer to the number of valid bits in the bit buffer. |
pDst |
Pointer to the destination vector. |
dstLen |
Lenght of the destination vector. |
pDstIdx |
Pointer to the index in the destination vector. |
pLitHuffCodes |
Pointer to the literals/lengths Huffman codes. |
pDistHuffCodes |
Pointer to the distances Huffman codes. |
flush |
Specifies the encoding mode for data blocks (see flush parameter). |
Description
This function performs LZ77 encoding of the ppSrc data according to the fastest algorithm.
To correctly process the first bytes of the source vector, initialize the pHashHead table with the winSize value.
The pSrcIdx parameter returns the index of the current position in the source vector, and is used to establish a correlation between the current position in the source vector and indexes in hash tables. After processing each 2GB of source data, the 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 when at least one of the specified pointers is NULL. |
ippStsSizeErr |
Indicates an error if winSize is less than 256, or more than 32768; or hashSize is less than 256, or more than 65536. |