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improved ratio

dev
inikep 2016-03-21 17:23:02 +01:00
parent 1269e2f7db
commit e7ec8f2b9b
3 changed files with 89 additions and 418 deletions
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33
lib/zstd_decompress.c
View File

@ -160,7 +160,7 @@ size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx)
dctx->hufTableX4[0] = HufLog;
dctx->flagStaticTables = 0;
dctx->fParams.mml = MINMATCH; /* overwritten by frame but forces ZSTD_btopt to MINMATCH in block mode */
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBegin searchLength=%d\n", dctx->base, dctx->params.searchLength);
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBegin searchLength=%d\n", dctx->base, dctx->fParams.mml);
return 0;
}
@ -683,38 +683,35 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
if (offsetCode==0) offset = 0;
if (offset < ZSTD_REP_NUM) {
#if 0
if (!litLength && offset <= 1)
offset = 1-offset;
if (offset != 0)
{
#if 1
#endif
if (offset != 0) {
size_t temp = seqState->prevOffset[offset];
if (offset != 1) {
if (offset == 3) seqState->prevOffset[3] = seqState->prevOffset[2];
seqState->prevOffset[2] = seqState->prevOffset[1];
}
offset = temp;
#else
offset = seqState->prevOffset[1];
#endif
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
}
else
} else {
offset = seqState->prevOffset[0];
}
if (litLength == 0) {
size_t temp = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = temp;
// offset = seqState->prevOffset[0];
}
} else {
offset -= ZSTD_REP_MOVE;
#if 0
// seqState->prevOffset[3] = seqState->prevOffset[2];
// seqState->prevOffset[2] = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = offset;
#else
if (kSlotNew < 3) seqState->prevOffset[3] = seqState->prevOffset[2];
if (kSlotNew < 2) seqState->prevOffset[2] = seqState->prevOffset[1];
if (kSlotNew < 1) seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[kSlotNew] = offset;
#endif
}
#else // ZSTD_REP_NUM == 1
#if 0
@ -944,7 +941,7 @@ static size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
if (srcSize >= ZSTD_BLOCKSIZE_MAX) return ERROR(srcSize_wrong);
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBlock_internal searchLength=%d\n", dctx->base, dctx->params.searchLength);
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBlock_internal searchLength=%d\n", dctx->base, dctx->fParams.mml);
/* Decode literals sub-block */
litCSize = ZSTD_decodeLiteralsBlock(dctx, src, srcSize);
@ -1055,7 +1052,7 @@ size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx,
const void* dict, size_t dictSize)
{
ZSTD_decompressBegin_usingDict(dctx, dict, dictSize);
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBegin_usingDict searchLength=%d\n", dctx->base, dctx->params.searchLength);
ZSTD_LOG_BLOCK("%p: ZSTD_decompressBegin_usingDict searchLength=%d\n", dctx->base, dctx->fParams.mml);
ZSTD_checkContinuity(dctx, dst);
return ZSTD_decompressFrame(dctx, dst, maxDstSize, src, srcSize);
}

2
lib/zstd_internal.h
View File

@ -183,7 +183,7 @@ typedef struct {
U32 off;
U32 mlen;
U32 litlen;
U32 rep[ZSTD_REP_NUM];
U32 rep[ZSTD_REP_INIT];
} ZSTD_optimal_t;
typedef struct {

466
lib/zstd_opt.h
View File

@ -444,22 +444,21 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
opt[0].litlen = (U32)(ip - litstart);
/* check repCode */
for (int i=0; i<ZSTD_REP_NUM; i++)
if (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[i], minMatch)) {
if (MEM_readMINMATCH(ip+1, minMatch) == MEM_readMINMATCH(ip+1 - rep[0], minMatch)) {
/* repcode : we take it */
mlen = (U32)ZSTD_count(ip+minMatch, ip+minMatch-rep[i], iend) + minMatch;
mlen = (U32)ZSTD_count(ip+1+minMatch, ip+1+minMatch-rep[0], iend) + minMatch;
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep[i], (int)mlen);
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep[0], (int)mlen);
if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
best_mlen = mlen; best_off = i; cur = 0; last_pos = 1;
ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
goto _storeSequence;
}
litlen = opt[0].litlen;
litlen = opt[0].litlen + 1;
do {
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, i, mlen - minMatch);
if (mlen > last_pos || price < opt[mlen].price)
SET_PRICE(mlen, mlen, i, litlen, price); /* note : macro modifies last_pos */
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, 0, mlen - minMatch);
if (mlen + 1 > last_pos || price < opt[mlen + 1].price)
SET_PRICE(mlen + 1, mlen, 0, litlen, price); /* note : macro modifies last_pos */
mlen--;
} while (mlen >= minMatch);
}
@ -469,10 +468,8 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
if (!last_pos && !match_num) { ip++; continue; }
opt[0].rep[0] = rep[0];
opt[0].rep[1] = rep[1];
opt[0].rep[2] = rep[2];
opt[0].rep[3] = rep[3];
for (int i=0; i<ZSTD_REP_INIT; i++)
opt[0].rep[i] = rep[i];
opt[0].mlen = 1;
if (match_num && matches[match_num-1].len > sufficient_len) {
@ -533,12 +530,35 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
opt[cur].rep[kSlotNew] = opt[cur].off - ZSTD_REP_MOVE;
ZSTD_LOG_ENCODE("%d: COPYREP_OFF cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} else {
#if 1
opt[cur].rep[3] = (opt[cur].off > 2) ? opt[cur-mlen].rep[2] : opt[cur-mlen].rep[3];
opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];
opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];
opt[cur].rep[0] = opt[cur-mlen].rep[opt[cur].off];
#if 1
if (cur!=mlen && opt[cur].litlen == 0) {
U32 temp = opt[cur].rep[0];
opt[cur].rep[0] = opt[cur].rep[1];
opt[cur].rep[1] = temp;
}
#endif
#else
if (cur!=mlen && opt[cur].litlen == 0) {
opt[cur].rep[3] = (opt[cur].off > 2) ? opt[cur-mlen].rep[2] : opt[cur-mlen].rep[3];
opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];
opt[cur].rep[0] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];
opt[cur].rep[1] = opt[cur-mlen].rep[opt[cur].off];
ZSTD_LOG_ENCODE("%d: COPYREP_SWI cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} else {
opt[cur].rep[3] = (opt[cur].off > 2) ? opt[cur-mlen].rep[2] : opt[cur-mlen].rep[3];
opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];
opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];
opt[cur].rep[0] = opt[cur-mlen].rep[opt[cur].off];
ZSTD_LOG_ENCODE("%d: COPYREP_NOR cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
}
#endif
}
ZSTD_LOG_PARSER("%d: CURRENT_NoExt price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]);
@ -547,11 +567,12 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
for (int i=0; i<ZSTD_REP_NUM; i++)
if (MEM_readMINMATCH(inr, minMatch) == MEM_readMINMATCH(inr - opt[cur].rep[i], minMatch)) { // check rep
mlen = (U32)ZSTD_count(inr+minMatch, inr+minMatch - opt[cur].rep[i], iend) + minMatch;
ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d rep=%d opt[%d].off=%d\n", (int)(inr-base), mlen, i, opt[cur].rep[i], cur, opt[cur].off);
ZSTD_LOG_PARSER("%d: Found REP %d/%d mlen=%d off=%d rep=%d opt[%d].off=%d\n", (int)(inr-base), i, ZSTD_REP_NUM, mlen, i, opt[cur].rep[i], cur, opt[cur].off);
best_off = i;//(i<=1 && opt[cur].mlen != 1) ? 1-i : i;
if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {
best_mlen = mlen;
best_off = i;
ZSTD_LOG_PARSER("%d: REP sufficient_len=%d best_mlen=%d best_off=%d last_pos=%d\n", (int)(inr-base), sufficient_len, best_mlen, best_off, last_pos);
last_pos = cur + 1;
goto _storeSequence;
@ -560,24 +581,25 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
if (opt[cur].mlen == 1) {
litlen = opt[cur].litlen;
if (cur > litlen) {
price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, i, mlen - minMatch);
price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, best_off, mlen - minMatch);
} else
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, i, mlen - minMatch);
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, best_off, mlen - minMatch);
} else {
litlen = 0;
price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, i, mlen - minMatch);
price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, best_off, mlen - minMatch);
}
best_mlen = mlen;
ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, i, price, litlen);
ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_off, price, litlen);
do {
if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
SET_PRICE(cur + mlen, mlen, i, litlen, price);
SET_PRICE(cur + mlen, mlen, best_off, litlen, price);
mlen--;
} while (mlen >= minMatch);
}
match_num = ZSTD_BtGetAllMatches_selectMLS(ctx, inr, iend, maxSearches, mls, matches);
ZSTD_LOG_PARSER("%d: ZSTD_GetAllMatches match_num=%d\n", (int)(inr-base), match_num);
@ -624,8 +646,8 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
/* store sequence */
_storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
for (u = 1; u <= last_pos; u++)
ZSTD_LOG_PARSER("%d: price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep, opt[u].rep[1]);
ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep);
ZSTD_LOG_PARSER("%d: price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]);
ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep[0]);
opt[0].mlen = 1;
U32 offset;
@ -642,12 +664,12 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
}
for (u = 0; u <= last_pos;) {
ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep, opt[u].rep[1]);
ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep[0], opt[u].rep[1]);
u += opt[u].mlen;
}
for (cur=0; cur < last_pos; ) {
ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep, opt[cur].rep[1]);
ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]);
mlen = opt[cur].mlen;
if (mlen == 1) { ip++; cur++; continue; }
offset = opt[cur].off;
@ -662,7 +684,22 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
if (kSlotNew < 1) rep[1] = rep[0];
rep[kSlotNew] = offset - ZSTD_REP_MOVE;
} else {
if (offset != 0) {
U32 temp = rep[offset];
rep[3] = (offset > 2) ? rep[2] : rep[3];
rep[2] = (offset > 1) ? rep[1] : rep[2];
rep[1] = (offset > 0) ? rep[0] : rep[1];
rep[0] = temp;
#if 1
if (litLength == 0) {
temp = rep[0];
rep[0] = rep[1];
rep[1] = temp;
}
#endif
/* if (offset != 0) {
size_t temp = rep[offset];
if (offset != 1) {
if (offset == 3) rep[3] = rep[2];
@ -672,7 +709,11 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
rep[0] = temp;
}
if (offset<=1 && litLength==0) offset = 1-offset;
if (litLength == 0) {
best_off = rep[1];
rep[1] = rep[0];
rep[0] = best_off;
}*/
}
// ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[1], (int)rep_2);
@ -711,374 +752,7 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
const void* src, size_t srcSize,
const U32 depth)
{
seqStore_t* seqStorePtr = &(ctx->seqStore);
const BYTE* const istart = (const BYTE*)src;
const BYTE* ip = istart;
const BYTE* anchor = istart;
const BYTE* litstart;
const BYTE* const iend = istart + srcSize;
const BYTE* const ilimit = iend - 8;
const BYTE* const base = ctx->base;
const U32 dictLimit = ctx->dictLimit;
const BYTE* const prefixStart = base + dictLimit;
const BYTE* const dictBase = ctx->dictBase;
const BYTE* const dictEnd = dictBase + dictLimit;
const U32 lowLimit = ctx->lowLimit;
const U32 maxSearches = 1U << ctx->params.searchLog;
const U32 sufficient_len = ctx->params.targetLength;
const U32 mls = ctx->params.searchLength;
const U32 minMatch = (ctx->params.searchLength == 3) ? 3 : 4;
ZSTD_optimal_t* opt = seqStorePtr->priceTable;
ZSTD_match_t* matches = seqStorePtr->matchTable;
const BYTE* inr;
U32 cur, match_num, last_pos, litlen, price;
/* init */
U32 rep[ZSTD_REP_INIT];
for (int i=0; i<ZSTD_REP_INIT; i++)
rep[i]=REPCODE_STARTVALUE;
ctx->nextToUpdate3 = ctx->nextToUpdate;
ZSTD_resetSeqStore(seqStorePtr);
ZSTD_rescaleFreqs(seqStorePtr);
if ((ip - prefixStart) < REPCODE_STARTVALUE) ip += REPCODE_STARTVALUE;
ZSTD_LOG_BLOCK("%d: COMPBLOCK_OPT_EXTDICT srcSz=%d maxSrch=%d mls=%d sufLen=%d\n", (int)(ip-base), (int)srcSize, maxSearches, mls, sufficient_len);
/* Match Loop */
while (ip < ilimit) {
U32 u, offset, best_off=0;
U32 mlen=0, best_mlen=0;
U32 current = (U32)(ip-base);
memset(opt, 0, sizeof(ZSTD_optimal_t));
last_pos = 0;
inr = ip;
litstart = ((U32)(ip - anchor) > 128) ? ip - 128 : anchor;
opt[0].litlen = (U32)(ip - litstart);
/* check repCode */
{
const U32 repIndex = (U32)(current+1 - rep[0]);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
&& (MEM_readMINMATCH(ip+1, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) {
/* repcode detected we should take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
mlen = (U32)ZSTD_count_2segments(ip+1+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch;
ZSTD_LOG_PARSER("%d: start try REP rep=%d mlen=%d\n", (int)(ip-base), (int)rep[0], (int)mlen);
if (depth==0 || mlen > sufficient_len || mlen >= ZSTD_OPT_NUM) {
ip+=1; best_mlen = mlen; best_off = 0; cur = 0; last_pos = 1;
goto _storeSequence;
}
litlen = opt[0].litlen + 1;
do {
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, 0, mlen - minMatch);
if (mlen + 1 > last_pos || price < opt[mlen + 1].price)
SET_PRICE(mlen + 1, mlen, 0, litlen, price);
mlen--;
} while (mlen >= minMatch);
} }
best_mlen = (last_pos) ? last_pos : minMatch;
match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, ip, iend, maxSearches, mls, matches); /* first search (depth 0) */
ZSTD_LOG_PARSER("%d: match_num=%d last_pos=%d\n", (int)(ip-base), match_num, last_pos);
if (!last_pos && !match_num) { ip++; continue; }
opt[0].rep[0] = rep[0];
opt[0].rep[1] = rep[1];
opt[0].mlen = 1;
if (match_num && matches[match_num-1].len > sufficient_len) {
best_mlen = matches[match_num-1].len;
best_off = matches[match_num-1].off;
cur = 0;
last_pos = 1;
goto _storeSequence;
}
// set prices using matches at position = 0
for (u = 0; u < match_num; u++) {
mlen = (u>0) ? matches[u-1].len+1 : best_mlen;
best_mlen = (matches[u].len < ZSTD_OPT_NUM) ? matches[u].len : ZSTD_OPT_NUM;
ZSTD_LOG_PARSER("%d: start Found mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(ip-base), matches[u].len, matches[u].off, (int)best_mlen, (int)last_pos);
litlen = opt[0].litlen;
while (mlen <= best_mlen) {
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, matches[u].off, mlen - minMatch);
if (mlen > last_pos || price < opt[mlen].price)
SET_PRICE(mlen, mlen, matches[u].off, litlen, price);
mlen++;
} }
if (last_pos < minMatch) {
// ip += ((ip-anchor) >> g_searchStrength) + 1; /* jump faster over incompressible sections */
ip++; continue;
}
/* check further positions */
for (cur = 1; cur <= last_pos; cur++) {
size_t cur_rep;
inr = ip + cur;
if (opt[cur-1].mlen == 1) {
litlen = opt[cur-1].litlen + 1;
if (cur > litlen) {
price = opt[cur - litlen].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-litlen);
} else
price = ZSTD_getLiteralPrice(seqStorePtr, litlen, litstart);
} else {
litlen = 1;
price = opt[cur - 1].price + ZSTD_getLiteralPrice(seqStorePtr, litlen, inr-1);
}
if (cur > last_pos || price <= opt[cur].price) // || ((price == opt[cur].price) && (opt[cur-1].mlen == 1) && (cur != litlen)))
SET_PRICE(cur, 1, 0, litlen, price);
if (cur == last_pos) break;
if (inr > ilimit) // last match must start at a minimum distance of 8 from oend
continue;
mlen = opt[cur].mlen;
if (opt[cur].off) {
opt[cur].rep[1] = opt[cur-mlen].rep[0];
opt[cur].rep[0]= opt[cur].off;
ZSTD_LOG_ENCODE("%d: COPYREP_OFF cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} else {
if (cur!=mlen && opt[cur].litlen == 0) {
opt[cur].rep[1] = opt[cur-mlen].rep[0];
opt[cur].rep[0] = opt[cur-mlen].rep[1];
ZSTD_LOG_ENCODE("%d: COPYREP_SWI cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} else {
opt[cur].rep[1] = opt[cur-mlen].rep[1];
opt[cur].rep[0] = opt[cur-mlen].rep[0];
ZSTD_LOG_ENCODE("%d: COPYREP_NOR cur=%d mlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
} }
ZSTD_LOG_PARSER("%d: CURRENT_Ext price[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]);
best_mlen = 0;
if (opt[cur].mlen != 1) {
cur_rep = opt[cur].rep[1];
ZSTD_LOG_PARSER("%d: tryExt REP2 rep[1]=%u mlen=%u\n", (int)(inr-base), (U32)cur_rep, mlen);
} else {
cur_rep = opt[cur].rep[0];
ZSTD_LOG_PARSER("%d: tryExt REP1 rep=%u mlen=%u\n", (int)(inr-base), (U32)cur_rep, mlen);
}
const U32 repIndex = (U32)(current+cur - cur_rep);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
&& (MEM_readMINMATCH(inr, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) {
/* repcode detected */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
mlen = (U32)ZSTD_count_2segments(inr+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch;
ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d rep=%d opt[%d].off=%d\n", (int)(inr-base), mlen, 0, opt[cur].rep, cur, opt[cur].off);
if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {
best_mlen = mlen;
best_off = 0;
ZSTD_LOG_PARSER("%d: REP sufficient_len=%d best_mlen=%d best_off=%d last_pos=%d\n", (int)(inr-base), sufficient_len, best_mlen, best_off, last_pos);
last_pos = cur + 1;
goto _storeSequence;
}
if (opt[cur].mlen == 1) {
litlen = opt[cur].litlen;
if (cur > litlen) {
price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, inr-litlen, 0, mlen - minMatch);
} else
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, 0, mlen - minMatch);
} else {
litlen = 0;
price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, 0, mlen - minMatch);
}
best_mlen = mlen;
ZSTD_LOG_PARSER("%d: Found REP mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, 0, price, litlen);
do {
if (cur + mlen > last_pos || price <= opt[cur + mlen].price) // || ((price == opt[cur + mlen].price) && (opt[cur].mlen == 1) && (cur != litlen))) // at equal price prefer REP instead of MATCH
SET_PRICE(cur + mlen, mlen, 0, litlen, price);
mlen--;
} while (mlen >= minMatch);
}
best_mlen = (best_mlen > minMatch) ? best_mlen : minMatch;
match_num = ZSTD_BtGetAllMatches_selectMLS_extDict(ctx, inr, iend, maxSearches, mls, matches);
ZSTD_LOG_PARSER("%d: ZSTD_GetAllMatches match_num=%d\n", (int)(inr-base), match_num);
if (match_num > 0 && matches[match_num-1].len > sufficient_len) {
best_mlen = matches[match_num-1].len;
best_off = matches[match_num-1].off;
last_pos = cur + 1;
goto _storeSequence;
}
// set prices using matches at position = cur
for (u = 0; u < match_num; u++) {
mlen = (u>0) ? matches[u-1].len+1 : best_mlen;
best_mlen = (cur + matches[u].len < ZSTD_OPT_NUM) ? matches[u].len : ZSTD_OPT_NUM - cur;
// ZSTD_LOG_PARSER("%d: Found1 cur=%d mlen=%d off=%d best_mlen=%d last_pos=%d\n", (int)(inr-base), cur, matches[u].len, matches[u].off, best_mlen, last_pos);
while (mlen <= best_mlen) {
if (opt[cur].mlen == 1) {
litlen = opt[cur].litlen;
if (cur > litlen)
price = opt[cur - litlen].price + ZSTD_getPrice(seqStorePtr, litlen, ip+cur-litlen, matches[u].off, mlen - minMatch);
else
price = ZSTD_getPrice(seqStorePtr, litlen, litstart, matches[u].off, mlen - minMatch);
} else {
litlen = 0;
price = opt[cur].price + ZSTD_getPrice(seqStorePtr, 0, NULL, matches[u].off, mlen - minMatch);
}
// ZSTD_LOG_PARSER("%d: Found2 mlen=%d best_mlen=%d off=%d price=%d litlen=%d\n", (int)(inr-base), mlen, best_mlen, matches[u].off, price, litlen);
if (cur + mlen > last_pos || (price < opt[cur + mlen].price))
SET_PRICE(cur + mlen, mlen, matches[u].off, litlen, price);
mlen++;
} } } // for (cur = 1; cur <= last_pos; cur++)
best_mlen = opt[last_pos].mlen;
best_off = opt[last_pos].off;
cur = last_pos - best_mlen;
/* store sequence */
_storeSequence: // cur, last_pos, best_mlen, best_off have to be set
for (u = 1; u <= last_pos; u++)
ZSTD_LOG_PARSER("%d: price[%u/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep, opt[u].rep[1]);
ZSTD_LOG_PARSER("%d: cur=%d/%d best_mlen=%d best_off=%d rep=%d\n", (int)(ip-base+cur), (int)cur, (int)last_pos, (int)best_mlen, (int)best_off, opt[cur].rep);
opt[0].mlen = 1;
while (1) {
mlen = opt[cur].mlen;
offset = opt[cur].off;
opt[cur].mlen = best_mlen;
opt[cur].off = best_off;
best_mlen = mlen;
best_off = offset;
if (mlen > cur) break;
cur -= mlen;
}
for (u = 0; u <= last_pos; ) {
ZSTD_LOG_PARSER("%d: price2[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+u), u, last_pos, opt[u].price, opt[u].off, opt[u].mlen, opt[u].litlen, opt[u].rep, opt[u].rep[1]);
u += opt[u].mlen;
}
for (cur=0; cur < last_pos; ) {
U32 litLength;
ZSTD_LOG_PARSER("%d: price3[%d/%d]=%d off=%d mlen=%d litlen=%d rep=%d rep[1]=%d\n", (int)(ip-base+cur), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep, opt[cur].rep[1]);
mlen = opt[cur].mlen;
if (mlen == 1) { ip++; cur++; continue; }
offset = opt[cur].off;
cur += mlen;
litLength = (U32)(ip - anchor);
ZSTD_LOG_ENCODE("%d/%d: ENCODE1 literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
if (offset) {
rep[1] = rep[0];
rep[0] = offset;
} else {
if (litLength == 0) {
best_off = rep[1];
rep[1] = rep[0];
rep[0] = best_off;
} }
ZSTD_LOG_ENCODE("%d/%d: ENCODE2 literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(ip-base), (int)(iend-base), (int)(litLength), (int)mlen, (int)(offset), (int)rep[0], (int)rep[1]);
#if ZSTD_OPT_DEBUG >= 5
U32 ml2;
if (offset) {
if (offset > (size_t)(ip - prefixStart)) {
const BYTE* match = dictEnd - (offset - (ip - prefixStart));
ml2 = ZSTD_count_2segments(ip, match, iend, dictEnd, prefixStart);
ZSTD_LOG_PARSER("%d: ZSTD_count_2segments=%d offset=%d dictBase=%p dictEnd=%p prefixStart=%p ip=%p match=%p\n", (int)current, (int)ml2, (int)offset, dictBase, dictEnd, prefixStart, ip, match);
}
else ml2 = (U32)ZSTD_count(ip, ip-offset, iend);
}
else ml2 = (U32)ZSTD_count(ip, ip-rep[0], iend);
if ((offset >= 8) && (ml2 < mlen || ml2 < minMatch)) {
printf("%d: ERROR_Ext iend=%d mlen=%d offset=%d ml2=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset, (int)ml2); exit(0); }
if (ip < anchor) {
printf("%d: ERROR_Ext ip < anchor iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
if (ip + mlen > iend) {
printf("%d: ERROR_Ext ip + mlen >= iend iend=%d mlen=%d offset=%d\n", (int)(ip - base), (int)(iend - ip), (int)mlen, (int)offset); exit(0); }
#endif
ZSTD_updatePrice(seqStorePtr, litLength, anchor, offset, mlen-minMatch);
ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset ? offset + ZSTD_REP_MOVE : 0, mlen-minMatch);
anchor = ip = ip + mlen;
}
#if 0
/* check immediate repcode */
while ((anchor >= base + lowLimit + rep[1]) && (anchor <= ilimit)) {
if ((anchor - rep[1]) >= prefixStart) {
if (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(anchor - rep[1], minMatch))
mlen = (U32)ZSTD_count(anchor+minMatch, anchor - rep[1] + minMatch, iend) + minMatch;
else
break;
} else {
const BYTE* repMatch = dictBase + ((anchor-base) - rep[1]);
if ((repMatch + minMatch <= dictEnd) && (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(repMatch, minMatch)))
mlen = (U32)ZSTD_count_2segments(anchor+minMatch, repMatch+minMatch, iend, dictEnd, prefixStart) + minMatch;
else
break;
}
offset = rep[1]; rep[1] = rep[0]; rep[0] = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep[0], (int)rep[1]);
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, mlen-minMatch);
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, mlen-minMatch);
anchor += mlen;
}
#else
/* check immediate repcode */
/* minimal correctness condition = while ((anchor >= prefixStart + REPCODE_STARTVALUE) && (anchor <= ilimit)) { */
while ((anchor >= base + lowLimit + rep[1]) && (anchor <= ilimit)) {
const U32 repIndex = (U32)((anchor-base) - rep[1]);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( ((U32)((dictLimit-1) - repIndex) >= 3) /* intentional overflow */
&& (MEM_readMINMATCH(anchor, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) {
/* repcode detected, let's take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
mlen = (U32)ZSTD_count_2segments(anchor+minMatch, repMatch+minMatch, iend, repEnd, prefixStart) + minMatch;
offset = rep[1]; rep[1] = rep[0]; rep[0] = offset; /* swap offset history */
ZSTD_LOG_ENCODE("%d/%d: ENCODE REP literals=%d mlen=%d off=%d rep1=%d rep[1]=%d\n", (int)(anchor-base), (int)(iend-base), (int)(0), (int)best_mlen, (int)(0), (int)rep[0], (int)rep[1]);
ZSTD_updatePrice(seqStorePtr, 0, anchor, 0, mlen-minMatch);
ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, mlen-minMatch);
anchor += mlen;
continue; /* faster when present ... (?) */
}
break;
}
#endif
if (anchor > ip) ip = anchor;
}
{ /* Last Literals */
size_t lastLLSize = iend - anchor;
ZSTD_LOG_ENCODE("%d: lastLLSize literals=%u\n", (int)(ip-base), (U32)(lastLLSize));
memcpy(seqStorePtr->lit, anchor, lastLLSize);
seqStorePtr->lit += lastLLSize;
}
(void)ctx; (void)src; (void)srcSize; (void)depth;
(void)ZSTD_BtGetAllMatches_selectMLS_extDict;
printf("ZSTD_compressBlock_opt_extDict_generic\n"), exit(0);
}