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path: root/thirdparty/zstd/compress/zstd_fast.c
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Diffstat (limited to 'thirdparty/zstd/compress/zstd_fast.c')
-rw-r--r--thirdparty/zstd/compress/zstd_fast.c158
1 files changed, 87 insertions, 71 deletions
diff --git a/thirdparty/zstd/compress/zstd_fast.c b/thirdparty/zstd/compress/zstd_fast.c
index 7b56c3d6ad..df4d28b340 100644
--- a/thirdparty/zstd/compress/zstd_fast.c
+++ b/thirdparty/zstd/compress/zstd_fast.c
@@ -12,39 +12,48 @@
#include "zstd_fast.h"
-void ZSTD_fillHashTable (ZSTD_CCtx* zc, const void* end, const U32 mls)
+void ZSTD_fillHashTable(ZSTD_matchState_t* ms,
+ ZSTD_compressionParameters const* cParams,
+ void const* end)
{
- U32* const hashTable = zc->hashTable;
- U32 const hBits = zc->appliedParams.cParams.hashLog;
- const BYTE* const base = zc->base;
- const BYTE* ip = base + zc->nextToUpdate;
+ U32* const hashTable = ms->hashTable;
+ U32 const hBits = cParams->hashLog;
+ U32 const mls = cParams->searchLength;
+ const BYTE* const base = ms->window.base;
+ const BYTE* ip = base + ms->nextToUpdate;
const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
- const size_t fastHashFillStep = 3;
+ const U32 fastHashFillStep = 3;
- while(ip <= iend) {
- hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip - base);
- ip += fastHashFillStep;
+ /* Always insert every fastHashFillStep position into the hash table.
+ * Insert the other positions if their hash entry is empty.
+ */
+ for (; ip + fastHashFillStep - 1 <= iend; ip += fastHashFillStep) {
+ U32 const current = (U32)(ip - base);
+ U32 i;
+ for (i = 0; i < fastHashFillStep; ++i) {
+ size_t const hash = ZSTD_hashPtr(ip + i, hBits, mls);
+ if (i == 0 || hashTable[hash] == 0)
+ hashTable[hash] = current + i;
+ }
}
}
-
FORCE_INLINE_TEMPLATE
-size_t ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
- const void* src, size_t srcSize,
- const U32 mls)
+size_t ZSTD_compressBlock_fast_generic(
+ ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
+ void const* src, size_t srcSize,
+ U32 const hlog, U32 const stepSize, U32 const mls)
{
- U32* const hashTable = cctx->hashTable;
- U32 const hBits = cctx->appliedParams.cParams.hashLog;
- seqStore_t* seqStorePtr = &(cctx->seqStore);
- const BYTE* const base = cctx->base;
+ U32* const hashTable = ms->hashTable;
+ const BYTE* const base = ms->window.base;
const BYTE* const istart = (const BYTE*)src;
const BYTE* ip = istart;
const BYTE* anchor = istart;
- const U32 lowestIndex = cctx->dictLimit;
+ const U32 lowestIndex = ms->window.dictLimit;
const BYTE* const lowest = base + lowestIndex;
const BYTE* const iend = istart + srcSize;
const BYTE* const ilimit = iend - HASH_READ_SIZE;
- U32 offset_1=seqStorePtr->rep[0], offset_2=seqStorePtr->rep[1];
+ U32 offset_1=rep[0], offset_2=rep[1];
U32 offsetSaved = 0;
/* init */
@@ -57,7 +66,7 @@ size_t ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
/* Main Search Loop */
while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
size_t mLength;
- size_t const h = ZSTD_hashPtr(ip, hBits, mls);
+ size_t const h = ZSTD_hashPtr(ip, hlog, mls);
U32 const current = (U32)(ip-base);
U32 const matchIndex = hashTable[h];
const BYTE* match = base + matchIndex;
@@ -66,21 +75,21 @@ size_t ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) {
mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
ip++;
- ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
} else {
- U32 offset;
- if ( (matchIndex <= lowestIndex) || (MEM_read32(match) != MEM_read32(ip)) ) {
- ip += ((ip-anchor) >> g_searchStrength) + 1;
+ if ( (matchIndex <= lowestIndex)
+ || (MEM_read32(match) != MEM_read32(ip)) ) {
+ assert(stepSize >= 1);
+ ip += ((ip-anchor) >> kSearchStrength) + stepSize;
continue;
}
mLength = ZSTD_count(ip+4, match+4, iend) + 4;
- offset = (U32)(ip-match);
- while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
- offset_2 = offset_1;
- offset_1 = offset;
-
- ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
- }
+ { U32 const offset = (U32)(ip-match);
+ while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
+ offset_2 = offset_1;
+ offset_1 = offset;
+ ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+ } }
/* match found */
ip += mLength;
@@ -88,8 +97,8 @@ size_t ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
if (ip <= ilimit) {
/* Fill Table */
- hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2; /* here because current+2 could be > iend-8 */
- hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base);
+ hashTable[ZSTD_hashPtr(base+current+2, hlog, mls)] = current+2; /* here because current+2 could be > iend-8 */
+ hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base);
/* check immediate repcode */
while ( (ip <= ilimit)
&& ( (offset_2>0)
@@ -97,65 +106,67 @@ size_t ZSTD_compressBlock_fast_generic(ZSTD_CCtx* cctx,
/* store sequence */
size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
{ U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */
- hashTable[ZSTD_hashPtr(ip, hBits, mls)] = (U32)(ip-base);
- ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, rLength-MINMATCH);
+ hashTable[ZSTD_hashPtr(ip, hlog, mls)] = (U32)(ip-base);
+ ZSTD_storeSeq(seqStore, 0, anchor, 0, rLength-MINMATCH);
ip += rLength;
anchor = ip;
continue; /* faster when present ... (?) */
} } }
/* save reps for next block */
- seqStorePtr->repToConfirm[0] = offset_1 ? offset_1 : offsetSaved;
- seqStorePtr->repToConfirm[1] = offset_2 ? offset_2 : offsetSaved;
+ rep[0] = offset_1 ? offset_1 : offsetSaved;
+ rep[1] = offset_2 ? offset_2 : offsetSaved;
/* Return the last literals size */
return iend - anchor;
}
-size_t ZSTD_compressBlock_fast(ZSTD_CCtx* ctx,
- const void* src, size_t srcSize)
+size_t ZSTD_compressBlock_fast(
+ ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
+ ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize)
{
- const U32 mls = ctx->appliedParams.cParams.searchLength;
+ U32 const hlog = cParams->hashLog;
+ U32 const mls = cParams->searchLength;
+ U32 const stepSize = cParams->targetLength;
switch(mls)
{
default: /* includes case 3 */
case 4 :
- return ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 4);
+ return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 4);
case 5 :
- return ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 5);
+ return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 5);
case 6 :
- return ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 6);
+ return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 6);
case 7 :
- return ZSTD_compressBlock_fast_generic(ctx, src, srcSize, 7);
+ return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 7);
}
}
-static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
- const void* src, size_t srcSize,
- const U32 mls)
+static size_t ZSTD_compressBlock_fast_extDict_generic(
+ ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
+ void const* src, size_t srcSize,
+ U32 const hlog, U32 const stepSize, U32 const mls)
{
- U32* hashTable = ctx->hashTable;
- const U32 hBits = ctx->appliedParams.cParams.hashLog;
- seqStore_t* seqStorePtr = &(ctx->seqStore);
- const BYTE* const base = ctx->base;
- const BYTE* const dictBase = ctx->dictBase;
+ U32* hashTable = ms->hashTable;
+ const BYTE* const base = ms->window.base;
+ const BYTE* const dictBase = ms->window.dictBase;
const BYTE* const istart = (const BYTE*)src;
const BYTE* ip = istart;
const BYTE* anchor = istart;
- const U32 lowestIndex = ctx->lowLimit;
+ const U32 lowestIndex = ms->window.lowLimit;
const BYTE* const dictStart = dictBase + lowestIndex;
- const U32 dictLimit = ctx->dictLimit;
+ const U32 dictLimit = ms->window.dictLimit;
const BYTE* const lowPrefixPtr = base + dictLimit;
const BYTE* const dictEnd = dictBase + dictLimit;
const BYTE* const iend = istart + srcSize;
const BYTE* const ilimit = iend - 8;
- U32 offset_1=seqStorePtr->rep[0], offset_2=seqStorePtr->rep[1];
+ U32 offset_1=rep[0], offset_2=rep[1];
/* Search Loop */
while (ip < ilimit) { /* < instead of <=, because (ip+1) */
- const size_t h = ZSTD_hashPtr(ip, hBits, mls);
+ const size_t h = ZSTD_hashPtr(ip, hlog, mls);
const U32 matchIndex = hashTable[h];
const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base;
const BYTE* match = matchBase + matchIndex;
@@ -171,11 +182,12 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend;
mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, lowPrefixPtr) + 4;
ip++;
- ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, 0, mLength-MINMATCH);
+ ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
} else {
if ( (matchIndex < lowestIndex) ||
(MEM_read32(match) != MEM_read32(ip)) ) {
- ip += ((ip-anchor) >> g_searchStrength) + 1;
+ assert(stepSize >= 1);
+ ip += ((ip-anchor) >> kSearchStrength) + stepSize;
continue;
}
{ const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend;
@@ -186,7 +198,7 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
offset = current - matchIndex;
offset_2 = offset_1;
offset_1 = offset;
- ZSTD_storeSeq(seqStorePtr, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
+ ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
} }
/* found a match : store it */
@@ -195,8 +207,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
if (ip <= ilimit) {
/* Fill Table */
- hashTable[ZSTD_hashPtr(base+current+2, hBits, mls)] = current+2;
- hashTable[ZSTD_hashPtr(ip-2, hBits, mls)] = (U32)(ip-2-base);
+ hashTable[ZSTD_hashPtr(base+current+2, hlog, mls)] = current+2;
+ hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base);
/* check immediate repcode */
while (ip <= ilimit) {
U32 const current2 = (U32)(ip-base);
@@ -207,8 +219,8 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend;
size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, lowPrefixPtr) + 4;
U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
- ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, repLength2-MINMATCH);
- hashTable[ZSTD_hashPtr(ip, hBits, mls)] = current2;
+ ZSTD_storeSeq(seqStore, 0, anchor, 0, repLength2-MINMATCH);
+ hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2;
ip += repLength2;
anchor = ip;
continue;
@@ -217,27 +229,31 @@ static size_t ZSTD_compressBlock_fast_extDict_generic(ZSTD_CCtx* ctx,
} } }
/* save reps for next block */
- seqStorePtr->repToConfirm[0] = offset_1; seqStorePtr->repToConfirm[1] = offset_2;
+ rep[0] = offset_1;
+ rep[1] = offset_2;
/* Return the last literals size */
return iend - anchor;
}
-size_t ZSTD_compressBlock_fast_extDict(ZSTD_CCtx* ctx,
- const void* src, size_t srcSize)
+size_t ZSTD_compressBlock_fast_extDict(
+ ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
+ ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize)
{
- U32 const mls = ctx->appliedParams.cParams.searchLength;
+ U32 const hlog = cParams->hashLog;
+ U32 const mls = cParams->searchLength;
+ U32 const stepSize = cParams->targetLength;
switch(mls)
{
default: /* includes case 3 */
case 4 :
- return ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 4);
+ return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 4);
case 5 :
- return ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 5);
+ return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 5);
case 6 :
- return ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 6);
+ return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 6);
case 7 :
- return ZSTD_compressBlock_fast_extDict_generic(ctx, src, srcSize, 7);
+ return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, hlog, stepSize, 7);
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 15:09:47 +0000