facebook
/
zstd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

changed update logic of repcodes

dev
inikep 2016-03-21 19:02:16 +01:00
parent e7ec8f2b9b
commit fc1d7bd93b
2 changed files with 37 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
lib/zstd_decompress.c
View File

@ -683,10 +683,14 @@ 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;
#endif
if (litLength == 0) {
if (offset <= 1) offset = 1-offset;
offset = seqState->prevOffset[offset];
size_t temp = seqState->prevOffset[1];
seqState->prevOffset[1] = seqState->prevOffset[0];
seqState->prevOffset[0] = temp;
}
else
if (offset != 0) {
size_t temp = seqState->prevOffset[offset];
if (offset != 1) {
@ -700,12 +704,6 @@ static void ZSTD_decodeSequence(seq_t* seq, seqState_t* seqState, const U32 mls)
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 (kSlotNew < 3) seqState->prevOffset[3] = seqState->prevOffset[2];

46
lib/zstd_opt.h
View File

@ -531,18 +531,17 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
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
if (cur!=mlen && opt[cur].litlen == 0) {
opt[cur].rep[0] = opt[cur-mlen].rep[1];
opt[cur].rep[1] = opt[cur-mlen].rep[0];
opt[cur].rep[2] = opt[cur-mlen].rep[2];
opt[cur].rep[3] = opt[cur-mlen].rep[3];
} 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];
#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];
@ -569,10 +568,13 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
mlen = (U32)ZSTD_count(inr+minMatch, inr+minMatch - opt[cur].rep[i], iend) + minMatch;
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;
best_off = (i<=1 && opt[cur].mlen != 1) ? 1-i : i;
if (mlen > sufficient_len || cur + mlen >= ZSTD_OPT_NUM) {
best_mlen = mlen;
#if 1
best_off = i;
#endif
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;
@ -594,7 +596,11 @@ void ZSTD_compressBlock_opt_generic(ZSTD_CCtx* ctx,
do {
if (cur + mlen > last_pos || price <= opt[cur + mlen].price)
#if 1
SET_PRICE(cur + mlen, mlen, i, litlen, price);
#else
SET_PRICE(cur + mlen, mlen, best_off, litlen, price);
#endif
mlen--;
} while (mlen >= minMatch);
}
@ -684,22 +690,13 @@ _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 {
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];
U32 temp = rep[0];
rep[0] = rep[1];
rep[1] = temp;
}
#endif
/* if (offset != 0) {
if (offset<=1) offset = 1-offset;
} else {
if (offset != 0) {
size_t temp = rep[offset];
if (offset != 1) {
if (offset == 3) rep[3] = rep[2];
@ -708,12 +705,7 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
rep[1] = rep[0];
rep[0] = temp;
}
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);