paramgrill can select manually targetLength
new compression levels
diff --git a/lib/zstd_compress.c b/lib/zstd_compress.c
index dda6683..3ffacc8 100644
--- a/lib/zstd_compress.c
+++ b/lib/zstd_compress.c
@@ -903,7 +903,7 @@
return (size_t)(pIn - pStart);
}
-/** ZSTD_count_2segments
+/** ZSTD_count_2segments() :
* can count match length with ip & match in potentially 2 different segments.
* convention : on reaching mEnd, match count continue starting from iStart
*/
@@ -1190,11 +1190,11 @@
}
-/* *************************************
+/*-*************************************
* Binary Tree search
***************************************/
-/** ZSTD_insertBt1() : add one or multiple positions to tree
-* ip : assumed <= iend-8
+/** ZSTD_insertBt1() : add one or multiple positions to tree.
+* ip : assumed <= iend-8 .
* @return : nb of positions added */
static U32 ZSTD_insertBt1(ZSTD_CCtx* zc, const BYTE* const ip, const U32 mls, const BYTE* const iend, U32 nbCompares,
U32 extDict)
@@ -1230,7 +1230,7 @@
while (nbCompares-- && (matchIndex > windowLow)) {
U32* nextPtr = bt + 2*(matchIndex & btMask);
size_t matchLength = MIN(commonLengthSmaller, commonLengthLarger); /* guaranteed minimum nb of common bytes */
-
+#if 1 /* note : can create issues when hlog small <= 11 */
const U32* predictPtr = bt + 2*((matchIndex-1) & btMask); /* written this way, as bt is a roll buffer */
if (matchIndex == predictedSmall) {
/* no need to check length, result known */
@@ -1249,7 +1249,7 @@
predictedLarge = predictPtr[0] + (predictPtr[0]>0);
continue;
}
-
+#endif
if ((!extDict) || (matchIndex+matchLength >= dictLimit)) {
match = base + matchIndex;
if (match[matchLength] == ip[matchLength])
@@ -1284,7 +1284,7 @@
} }
*smallerPtr = *largerPtr = 0;
- return (matchEndIdx > current + 8) ? matchEndIdx - current - 8 : 1;
+ return (matchEndIdx > current + 8) ? (matchEndIdx - current) - 8 : 1;
}
@@ -2339,12 +2339,12 @@
{ 0, 0, 23, 24, 23, 4, 5, ZSTD_btlazy2 }, /* level 17 */
{ 0, 0, 25, 24, 23, 5, 5, ZSTD_btlazy2 }, /* level 18 */
{ 0, 0, 25, 26, 23, 5, 5, ZSTD_btlazy2 }, /* level 19 */
- { 0, 0, 26, 27, 25, 9, 5, ZSTD_btlazy2 }, /* level 20 */
- { 0, 0, 23, 21, 22, 5, 4, ZSTD_btlazy2 }, /* level 21 = 16 + L=4 */ // 41233150 btlazy1=41560211 norep1=42322286
- { 0, 12, 23, 21, 22, 5, 4, ZSTD_opt }, /* level 22 */
- { 0, 32, 23, 21, 22, 5, 4, ZSTD_opt }, /* level 23 */
- { 0, 32, 23, 21, 22, 5, 4, ZSTD_opt_bt }, /* level 24 = 16 + btopt */
- { 0, 64, 26, 27, 25, 10, 4, ZSTD_opt_bt }, /* level 25 = 20 + btopt */
+ { 0, 12, 22, 20, 21, 3, 5, ZSTD_opt }, /* level 20 */
+ { 0, 16, 23, 21, 22, 4, 4, ZSTD_opt }, /* level 21 */
+ { 0, 32, 25, 25, 24, 5, 4, ZSTD_opt_bt }, /* level 22 */
+ { 0, 64, 25, 26, 24, 6, 4, ZSTD_opt_bt }, /* level 23 */
+ { 0,128, 26, 26, 25, 8, 4, ZSTD_opt_bt }, /* level 24 */
+ { 0,256, 26, 27, 25, 10, 4, ZSTD_opt_bt }, /* level 25 */
},
{ /* for srcSize <= 256 KB */
/* SL, W, C, H, S, L, strat */