DeflateLZ77FastestPrecompHeader
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 thepHashPrevtable.
- pHashHead
- Pointer to the table containing heads of the hash chains.
- hashSize
- Size of thepHashHeadtable.
- 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 isNULL.
- ippStsSizeErr
- Indicates an error whenwinSizeis less than 256 or more than 32768, or ifhashSizeis less than 256 or more than 65536, or if *pDstIdxis more than or equal todstLen.