AuroraMiddleware/zstd
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This commit is contained in:
inikep 2016-02-02 17:41:21 +01:00
parent d6e8cc5f0c
commit 5d4131067b
1 changed files with 19 additions and 10 deletions
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29
lib/zstd_opt.c
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@ -317,7 +317,7 @@ void ZSTD_compressBlock_opt2_generic(ZSTD_CCtx* ctx,
U32 maxNbAttempts, U32 matchLengthSearch);
searchMax_f searchMax = searchMethod ? ZSTD_BtFindBestMatch_selectMLS : ZSTD_HcFindBestMatch_selectMLS;
#if 0
#if 0
typedef size_t (*getAllMatches_f)(ZSTD_CCtx* zc, const BYTE* ip, const BYTE* iLimit,
U32 maxNbAttempts, U32 matchLengthSearch, LZ5HC_match_t* matches);
getAllMatches_f getAllMatches = searchMethod ? ZSTD_BtGetAllMatches_selectMLS : ZSTD_HcGetAllMatches_selectMLS;
@ -335,7 +335,7 @@ void ZSTD_compressBlock_opt2_generic(ZSTD_CCtx* ctx,
size_t offset=0;
const BYTE* start=ip+1;
//#define ZSTD_USE_REP
#define ZSTD_USE_REP
#ifdef ZSTD_USE_REP
/* check repCode */
if (MEM_read32(start) == MEM_read32(start - offset_1)) {
@ -395,6 +395,9 @@ void ZSTD_compressBlock_opt2_generic(ZSTD_CCtx* ctx,
}
#endif
/* store sequence */
_storeSequence:
/* catch up */
if (offset) {
while ((start>anchor) && (start>base+offset) && (start[-1] == start[-1-offset])) /* only search for offset within prefix */
@ -402,8 +405,6 @@ void ZSTD_compressBlock_opt2_generic(ZSTD_CCtx* ctx,
offset_2 = offset_1; offset_1 = offset;
}
/* store sequence */
_storeSequence:
{
size_t litLength = start - anchor;
LZ5_LOG_ENCODE("%d/%d: ENCODE literals=%d off=%d mlen=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)(offset), (int)matchLength);
@ -499,14 +500,14 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
LZ5_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep_1, (int)mlen);
if (depth==0 || mlen > sufficient_len || mlen >= LZ5_OPT_NUM) {
ip++; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
ip+=cur; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
goto _storeSequence;
}
do
{
litlen = 0;
price = LZ5HC_get_price(llen, 0, mlen - MINMATCH) - LZ5_LIT_COST(llen);
price = LZ5HC_get_price(llen + cur, 0, mlen - MINMATCH) - LZ5_LIT_COST(llen + cur);
if (mlen + cur > last_pos || price < opt[mlen + cur].price)
SET_PRICE(mlen + cur, mlen, 0, litlen, price);
mlen--;
@ -624,7 +625,7 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
LZ5_LOG_PARSER("%d: CURRENT price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep);
#ifdef ZSTD_USE_REP
#if 0
// check rep
// best_mlen = 0;
mlen = ZSTD_count(inr, inr - opt[cur].rep, iend);
@ -888,13 +889,21 @@ _storeSequence: // cur, last_pos, best_mlen, best_off have to be set
anchor = ip = ip + mlen;
if (offset)
rep_2 = rep_1, rep_1 = offset;
{
rep_2 = rep_1;
rep_1 = offset;
}
else
{
/* best_off = rep_2;
rep_2 = rep_1;
rep_1 = best_off;*/
}
LZ5_LOG_PARSER("%d: offset=%d rep=%d\n", (int)(ip-base), (int)offset, (int)rep_1);
}
#ifdef ZSTD_USE_REP
#if 0
// check immediate repcode
while ( (ip <= ilimit)
&& (MEM_read32(ip) == MEM_read32(ip - rep_2)) ) {