Visible to Intel only — GUID: GUID-CDF12B17-2CCE-4B43-AA77-444BCD983598
Visible to Intel only — GUID: GUID-CDF12B17-2CCE-4B43-AA77-444BCD983598
DeflateLZ77FastestPrecompHeader
Performs LZ77 encoding using the fastest algorithm with prebuilding of customer Huffman tables and prediction header.
Syntax
IppStatus ippsDeflateLZ77FastestPrecompHeader_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[288], IppDeflateHuffCode pDistHuffCodes[30], const Ipp8u* pHeaderCodeLens, int numBitsHeader, 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 |
The length 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. |
pHeaderCodeLens |
Pointer to the prediction header with description of Huffman tables. |
numBitsHeader |
Length of the prediction header, in bits. |
flush |
Specifies the encoding mode for data blocks. |
Description
This function performs LZ77 encoding of source data ppSrc using the fastest algorithm.
To correctly process the first bytes of the source vector, initialize the pHashHead table with -winSize value.
The pSrcIdx parameter returns the index of the current position in the source vector and 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 when one of the specified pointers is NULL. |
ippStsSizeErr |
Indicates an error when winSize is less than 256 or more than 32768, or if hashSize is less than 256 or more than 65536, or if *pDstIdx is more than or equal to dstLen. |