created zstd_stats.h
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inikep
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/*
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zstd - standard compression library
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Header File for static linking only
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Copyright (C) 2014-2016, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- zstd homepage : http://www.zstd.net
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*/
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#ifndef ZSTD_STATS_H
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#define ZSTD_STATS_H
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-*************************************
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* Dependencies
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***************************************/
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//#include "zstd.h"
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//#include "mem.h"
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/*-*************************************
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* Constants
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***************************************/
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//#define ZSTD_MAGICNUMBER 0xFD2FB526 /* v0.6 */
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/*-*************************************
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* Types
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***************************************/
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typedef struct {
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U32 priceOffset, priceOffCode, priceMatchLength, priceLiteral, priceLitLength, priceDumpsLength;
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U32 totalMatchSum, totalLitSum, totalSeqSum, totalRepSum;
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U32 litSum, matchLengthSum, litLengthSum, offCodeSum;
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U32 matchLengthFreq[1<<MLbits];
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U32 litLengthFreq[1<<LLbits];
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U32 litFreq[1<<Litbits];
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U32 offCodeFreq[1<<Offbits];
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} ZSTD_stats_t;
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/*-*************************************
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* Advanced functions
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***************************************/
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MEM_STATIC void ZSTD_statsPrint(ZSTD_stats_t* stats, U32 searchLength)
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{
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stats->totalMatchSum += stats->totalSeqSum * ((searchLength == 3) ? 3 : 4);
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printf("avgMatchL=%.2f avgLitL=%.2f match=%.1f%% lit=%.1f%% reps=%d seq=%d\n", (float)stats->totalMatchSum/stats->totalSeqSum, (float)stats->totalLitSum/stats->totalSeqSum, 100.0*stats->totalMatchSum/(stats->totalMatchSum+stats->totalLitSum), 100.0*stats->totalLitSum/(stats->totalMatchSum+stats->totalLitSum), stats->totalRepSum, stats->totalSeqSum);
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printf("SumBytes=%d Offset=%d OffCode=%d Match=%d Literal=%d LitLength=%d DumpsLength=%d\n", (stats->priceOffset+stats->priceOffCode+stats->priceMatchLength+stats->priceLiteral+stats->priceLitLength+stats->priceDumpsLength)/8, stats->priceOffset/8, stats->priceOffCode/8, stats->priceMatchLength/8, stats->priceLiteral/8, stats->priceLitLength/8, stats->priceDumpsLength/8);
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}
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MEM_STATIC void ZSTD_statsInit(ZSTD_stats_t* stats)
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{
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stats->totalLitSum = stats->totalMatchSum = stats->totalSeqSum = stats->totalRepSum = 1;
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stats->priceOffset = stats->priceOffCode = stats->priceMatchLength = stats->priceLiteral = stats->priceLitLength = stats->priceDumpsLength = 0;
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}
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MEM_STATIC void ZSTD_statsResetFreqs(ZSTD_stats_t* stats)
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{
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unsigned u;
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stats->litSum = (1<<Litbits);
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stats->litLengthSum = (1<<LLbits);
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stats->matchLengthSum = (1<<MLbits);
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stats->offCodeSum = (1<<Offbits);
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for (u=0; u<=MaxLit; u++)
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stats->litFreq[u] = 1;
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for (u=0; u<=MaxLL; u++)
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stats->litLengthFreq[u] = 1;
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for (u=0; u<=MaxML; u++)
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stats->matchLengthFreq[u] = 1;
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for (u=0; u<=MaxOff; u++)
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stats->offCodeFreq[u] = 1;
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}
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MEM_STATIC void ZSTD_statsUpdatePrices(ZSTD_stats_t* stats, U32 litLength, const BYTE* literals, U32 offset, U32 matchLength)
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{
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/* offset */
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BYTE offCode = offset ? (BYTE)ZSTD_highbit(offset+1) + 1 : 0;
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stats->priceOffCode += ZSTD_highbit(stats->offCodeSum+1) - ZSTD_highbit(stats->offCodeFreq[offCode]+1);
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stats->priceOffset += (offCode-1) + (!offCode);
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/* match Length */
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stats->priceDumpsLength += ((matchLength >= MaxML)<<3) + ((matchLength >= 255+MaxML)<<4) + ((matchLength>=(1<<15))<<3);
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stats->priceMatchLength += ZSTD_highbit(stats->matchLengthSum+1) - ZSTD_highbit(stats->matchLengthFreq[(matchLength >= MaxML) ? MaxML : matchLength]+1);
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if (litLength) {
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/* literals */
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U32 u;
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stats->priceLiteral += litLength * ZSTD_highbit(stats->litSum+1);
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for (u=0; u < litLength; u++)
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stats->priceLiteral -= ZSTD_highbit(stats->litFreq[literals[u]]+1);
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/* literal Length */
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stats->priceDumpsLength += ((litLength >= MaxLL)<<3) + ((litLength >= 255+MaxLL)<<4) + ((litLength>=(1<<15))<<3);
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stats->priceLitLength += ZSTD_highbit(stats->litLengthSum+1) - ZSTD_highbit(stats->litLengthFreq[(litLength >= MaxLL) ? MaxLL : litLength]+1);
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} else {
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stats->priceLitLength += ZSTD_highbit(stats->litLengthSum+1) - ZSTD_highbit(stats->litLengthFreq[0]+1);
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}
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if (offset == 0) stats->totalRepSum++;
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stats->totalSeqSum++;
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stats->totalMatchSum += matchLength;
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stats->totalLitSum += litLength;
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U32 u;
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/* literals */
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stats->litSum += litLength;
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for (u=0; u < litLength; u++)
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stats->litFreq[literals[u]]++;
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/* literal Length */
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stats->litLengthSum++;
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if (litLength >= MaxLL)
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stats->litLengthFreq[MaxLL]++;
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else
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stats->litLengthFreq[litLength]++;
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/* match offset */
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stats->offCodeSum++;
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stats->offCodeFreq[offCode]++;
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/* match Length */
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stats->matchLengthSum++;
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if (matchLength >= MaxML)
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stats->matchLengthFreq[MaxML]++;
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else
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stats->matchLengthFreq[matchLength]++;
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}
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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTD_STATIC_H */
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