39ed39900e
Release notes: - https://github.com/facebook/zstd/releases/tag/v1.5.1 - https://github.com/facebook/zstd/releases/tag/v1.5.2
696 lines
30 KiB
C
696 lines
30 KiB
C
/*
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* Copyright (c) Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#include "zstd_compress_internal.h"
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#include "zstd_double_fast.h"
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void ZSTD_fillDoubleHashTable(ZSTD_matchState_t* ms,
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void const* end, ZSTD_dictTableLoadMethod_e dtlm)
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{
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const ZSTD_compressionParameters* const cParams = &ms->cParams;
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U32* const hashLarge = ms->hashTable;
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U32 const hBitsL = cParams->hashLog;
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U32 const mls = cParams->minMatch;
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U32* const hashSmall = ms->chainTable;
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U32 const hBitsS = cParams->chainLog;
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const BYTE* const base = ms->window.base;
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const BYTE* ip = base + ms->nextToUpdate;
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const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
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const U32 fastHashFillStep = 3;
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/* Always insert every fastHashFillStep position into the hash tables.
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* Insert the other positions into the large hash table if their entry
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* is empty.
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*/
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for (; ip + fastHashFillStep - 1 <= iend; ip += fastHashFillStep) {
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U32 const curr = (U32)(ip - base);
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U32 i;
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for (i = 0; i < fastHashFillStep; ++i) {
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size_t const smHash = ZSTD_hashPtr(ip + i, hBitsS, mls);
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size_t const lgHash = ZSTD_hashPtr(ip + i, hBitsL, 8);
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if (i == 0)
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hashSmall[smHash] = curr + i;
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if (i == 0 || hashLarge[lgHash] == 0)
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hashLarge[lgHash] = curr + i;
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/* Only load extra positions for ZSTD_dtlm_full */
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if (dtlm == ZSTD_dtlm_fast)
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break;
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} }
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}
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FORCE_INLINE_TEMPLATE
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size_t ZSTD_compressBlock_doubleFast_noDict_generic(
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ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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void const* src, size_t srcSize, U32 const mls /* template */)
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{
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ZSTD_compressionParameters const* cParams = &ms->cParams;
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U32* const hashLong = ms->hashTable;
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const U32 hBitsL = cParams->hashLog;
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U32* const hashSmall = ms->chainTable;
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const U32 hBitsS = cParams->chainLog;
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const BYTE* const base = ms->window.base;
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const BYTE* const istart = (const BYTE*)src;
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const BYTE* anchor = istart;
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const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
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/* presumes that, if there is a dictionary, it must be using Attach mode */
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const U32 prefixLowestIndex = ZSTD_getLowestPrefixIndex(ms, endIndex, cParams->windowLog);
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const BYTE* const prefixLowest = base + prefixLowestIndex;
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const BYTE* const iend = istart + srcSize;
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const BYTE* const ilimit = iend - HASH_READ_SIZE;
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U32 offset_1=rep[0], offset_2=rep[1];
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U32 offsetSaved = 0;
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size_t mLength;
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U32 offset;
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U32 curr;
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/* how many positions to search before increasing step size */
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const size_t kStepIncr = 1 << kSearchStrength;
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/* the position at which to increment the step size if no match is found */
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const BYTE* nextStep;
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size_t step; /* the current step size */
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size_t hl0; /* the long hash at ip */
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size_t hl1; /* the long hash at ip1 */
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U32 idxl0; /* the long match index for ip */
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U32 idxl1; /* the long match index for ip1 */
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const BYTE* matchl0; /* the long match for ip */
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const BYTE* matchs0; /* the short match for ip */
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const BYTE* matchl1; /* the long match for ip1 */
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const BYTE* ip = istart; /* the current position */
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const BYTE* ip1; /* the next position */
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DEBUGLOG(5, "ZSTD_compressBlock_doubleFast_noDict_generic");
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/* init */
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ip += ((ip - prefixLowest) == 0);
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{
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U32 const current = (U32)(ip - base);
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U32 const windowLow = ZSTD_getLowestPrefixIndex(ms, current, cParams->windowLog);
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U32 const maxRep = current - windowLow;
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if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0;
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if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
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}
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/* Outer Loop: one iteration per match found and stored */
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while (1) {
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step = 1;
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nextStep = ip + kStepIncr;
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ip1 = ip + step;
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if (ip1 > ilimit) {
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goto _cleanup;
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}
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hl0 = ZSTD_hashPtr(ip, hBitsL, 8);
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idxl0 = hashLong[hl0];
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matchl0 = base + idxl0;
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/* Inner Loop: one iteration per search / position */
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do {
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const size_t hs0 = ZSTD_hashPtr(ip, hBitsS, mls);
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const U32 idxs0 = hashSmall[hs0];
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curr = (U32)(ip-base);
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matchs0 = base + idxs0;
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hashLong[hl0] = hashSmall[hs0] = curr; /* update hash tables */
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/* check noDict repcode */
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if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) {
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mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
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ip++;
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ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_REPCODE_1, mLength);
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goto _match_stored;
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}
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hl1 = ZSTD_hashPtr(ip1, hBitsL, 8);
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if (idxl0 > prefixLowestIndex) {
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/* check prefix long match */
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if (MEM_read64(matchl0) == MEM_read64(ip)) {
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mLength = ZSTD_count(ip+8, matchl0+8, iend) + 8;
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offset = (U32)(ip-matchl0);
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while (((ip>anchor) & (matchl0>prefixLowest)) && (ip[-1] == matchl0[-1])) { ip--; matchl0--; mLength++; } /* catch up */
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goto _match_found;
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}
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}
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idxl1 = hashLong[hl1];
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matchl1 = base + idxl1;
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if (idxs0 > prefixLowestIndex) {
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/* check prefix short match */
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if (MEM_read32(matchs0) == MEM_read32(ip)) {
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goto _search_next_long;
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}
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}
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if (ip1 >= nextStep) {
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PREFETCH_L1(ip1 + 64);
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PREFETCH_L1(ip1 + 128);
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step++;
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nextStep += kStepIncr;
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}
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ip = ip1;
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ip1 += step;
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hl0 = hl1;
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idxl0 = idxl1;
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matchl0 = matchl1;
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#if defined(__aarch64__)
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PREFETCH_L1(ip+256);
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#endif
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} while (ip1 <= ilimit);
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_cleanup:
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/* save reps for next block */
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rep[0] = offset_1 ? offset_1 : offsetSaved;
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rep[1] = offset_2 ? offset_2 : offsetSaved;
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/* Return the last literals size */
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return (size_t)(iend - anchor);
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_search_next_long:
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/* check prefix long +1 match */
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if (idxl1 > prefixLowestIndex) {
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if (MEM_read64(matchl1) == MEM_read64(ip1)) {
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ip = ip1;
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mLength = ZSTD_count(ip+8, matchl1+8, iend) + 8;
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offset = (U32)(ip-matchl1);
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while (((ip>anchor) & (matchl1>prefixLowest)) && (ip[-1] == matchl1[-1])) { ip--; matchl1--; mLength++; } /* catch up */
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goto _match_found;
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}
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}
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/* if no long +1 match, explore the short match we found */
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mLength = ZSTD_count(ip+4, matchs0+4, iend) + 4;
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offset = (U32)(ip - matchs0);
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while (((ip>anchor) & (matchs0>prefixLowest)) && (ip[-1] == matchs0[-1])) { ip--; matchs0--; mLength++; } /* catch up */
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/* fall-through */
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_match_found: /* requires ip, offset, mLength */
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offset_2 = offset_1;
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offset_1 = offset;
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if (step < 4) {
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/* It is unsafe to write this value back to the hashtable when ip1 is
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* greater than or equal to the new ip we will have after we're done
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* processing this match. Rather than perform that test directly
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* (ip1 >= ip + mLength), which costs speed in practice, we do a simpler
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* more predictable test. The minmatch even if we take a short match is
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* 4 bytes, so as long as step, the distance between ip and ip1
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* (initially) is less than 4, we know ip1 < new ip. */
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hashLong[hl1] = (U32)(ip1 - base);
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}
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ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
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_match_stored:
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/* match found */
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ip += mLength;
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anchor = ip;
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if (ip <= ilimit) {
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/* Complementary insertion */
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/* done after iLimit test, as candidates could be > iend-8 */
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{ U32 const indexToInsert = curr+2;
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hashLong[ZSTD_hashPtr(base+indexToInsert, hBitsL, 8)] = indexToInsert;
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hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base);
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hashSmall[ZSTD_hashPtr(base+indexToInsert, hBitsS, mls)] = indexToInsert;
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hashSmall[ZSTD_hashPtr(ip-1, hBitsS, mls)] = (U32)(ip-1-base);
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}
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/* check immediate repcode */
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while ( (ip <= ilimit)
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&& ( (offset_2>0)
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& (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
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/* store sequence */
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size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
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U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; /* swap offset_2 <=> offset_1 */
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hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base);
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hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base);
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ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, rLength);
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ip += rLength;
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anchor = ip;
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continue; /* faster when present ... (?) */
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}
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}
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}
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}
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FORCE_INLINE_TEMPLATE
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size_t ZSTD_compressBlock_doubleFast_dictMatchState_generic(
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ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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void const* src, size_t srcSize,
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U32 const mls /* template */)
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{
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ZSTD_compressionParameters const* cParams = &ms->cParams;
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U32* const hashLong = ms->hashTable;
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const U32 hBitsL = cParams->hashLog;
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U32* const hashSmall = ms->chainTable;
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const U32 hBitsS = cParams->chainLog;
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const BYTE* const base = ms->window.base;
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const BYTE* const istart = (const BYTE*)src;
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const BYTE* ip = istart;
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const BYTE* anchor = istart;
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const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
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/* presumes that, if there is a dictionary, it must be using Attach mode */
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const U32 prefixLowestIndex = ZSTD_getLowestPrefixIndex(ms, endIndex, cParams->windowLog);
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const BYTE* const prefixLowest = base + prefixLowestIndex;
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const BYTE* const iend = istart + srcSize;
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const BYTE* const ilimit = iend - HASH_READ_SIZE;
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U32 offset_1=rep[0], offset_2=rep[1];
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U32 offsetSaved = 0;
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const ZSTD_matchState_t* const dms = ms->dictMatchState;
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const ZSTD_compressionParameters* const dictCParams = &dms->cParams;
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const U32* const dictHashLong = dms->hashTable;
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const U32* const dictHashSmall = dms->chainTable;
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const U32 dictStartIndex = dms->window.dictLimit;
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const BYTE* const dictBase = dms->window.base;
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const BYTE* const dictStart = dictBase + dictStartIndex;
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const BYTE* const dictEnd = dms->window.nextSrc;
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const U32 dictIndexDelta = prefixLowestIndex - (U32)(dictEnd - dictBase);
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const U32 dictHBitsL = dictCParams->hashLog;
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const U32 dictHBitsS = dictCParams->chainLog;
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const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictStart));
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DEBUGLOG(5, "ZSTD_compressBlock_doubleFast_dictMatchState_generic");
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/* if a dictionary is attached, it must be within window range */
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assert(ms->window.dictLimit + (1U << cParams->windowLog) >= endIndex);
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/* init */
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ip += (dictAndPrefixLength == 0);
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/* dictMatchState repCode checks don't currently handle repCode == 0
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* disabling. */
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assert(offset_1 <= dictAndPrefixLength);
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assert(offset_2 <= dictAndPrefixLength);
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/* Main Search Loop */
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while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
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size_t mLength;
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U32 offset;
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size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8);
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size_t const h = ZSTD_hashPtr(ip, hBitsS, mls);
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size_t const dictHL = ZSTD_hashPtr(ip, dictHBitsL, 8);
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size_t const dictHS = ZSTD_hashPtr(ip, dictHBitsS, mls);
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U32 const curr = (U32)(ip-base);
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U32 const matchIndexL = hashLong[h2];
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U32 matchIndexS = hashSmall[h];
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const BYTE* matchLong = base + matchIndexL;
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const BYTE* match = base + matchIndexS;
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const U32 repIndex = curr + 1 - offset_1;
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const BYTE* repMatch = (repIndex < prefixLowestIndex) ?
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dictBase + (repIndex - dictIndexDelta) :
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base + repIndex;
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hashLong[h2] = hashSmall[h] = curr; /* update hash tables */
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/* check repcode */
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if (((U32)((prefixLowestIndex-1) - repIndex) >= 3 /* intentional underflow */)
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&& (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
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const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend;
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mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4;
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ip++;
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ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_REPCODE_1, mLength);
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goto _match_stored;
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}
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if (matchIndexL > prefixLowestIndex) {
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/* check prefix long match */
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if (MEM_read64(matchLong) == MEM_read64(ip)) {
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mLength = ZSTD_count(ip+8, matchLong+8, iend) + 8;
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offset = (U32)(ip-matchLong);
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while (((ip>anchor) & (matchLong>prefixLowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
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goto _match_found;
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}
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} else {
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/* check dictMatchState long match */
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U32 const dictMatchIndexL = dictHashLong[dictHL];
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const BYTE* dictMatchL = dictBase + dictMatchIndexL;
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assert(dictMatchL < dictEnd);
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if (dictMatchL > dictStart && MEM_read64(dictMatchL) == MEM_read64(ip)) {
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mLength = ZSTD_count_2segments(ip+8, dictMatchL+8, iend, dictEnd, prefixLowest) + 8;
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offset = (U32)(curr - dictMatchIndexL - dictIndexDelta);
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while (((ip>anchor) & (dictMatchL>dictStart)) && (ip[-1] == dictMatchL[-1])) { ip--; dictMatchL--; mLength++; } /* catch up */
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goto _match_found;
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} }
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if (matchIndexS > prefixLowestIndex) {
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/* check prefix short match */
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if (MEM_read32(match) == MEM_read32(ip)) {
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goto _search_next_long;
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}
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} else {
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/* check dictMatchState short match */
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U32 const dictMatchIndexS = dictHashSmall[dictHS];
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match = dictBase + dictMatchIndexS;
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matchIndexS = dictMatchIndexS + dictIndexDelta;
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if (match > dictStart && MEM_read32(match) == MEM_read32(ip)) {
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goto _search_next_long;
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} }
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ip += ((ip-anchor) >> kSearchStrength) + 1;
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#if defined(__aarch64__)
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PREFETCH_L1(ip+256);
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#endif
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continue;
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_search_next_long:
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{ size_t const hl3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
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size_t const dictHLNext = ZSTD_hashPtr(ip+1, dictHBitsL, 8);
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U32 const matchIndexL3 = hashLong[hl3];
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const BYTE* matchL3 = base + matchIndexL3;
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hashLong[hl3] = curr + 1;
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/* check prefix long +1 match */
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if (matchIndexL3 > prefixLowestIndex) {
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if (MEM_read64(matchL3) == MEM_read64(ip+1)) {
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mLength = ZSTD_count(ip+9, matchL3+8, iend) + 8;
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ip++;
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offset = (U32)(ip-matchL3);
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while (((ip>anchor) & (matchL3>prefixLowest)) && (ip[-1] == matchL3[-1])) { ip--; matchL3--; mLength++; } /* catch up */
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goto _match_found;
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}
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} else {
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/* check dict long +1 match */
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U32 const dictMatchIndexL3 = dictHashLong[dictHLNext];
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const BYTE* dictMatchL3 = dictBase + dictMatchIndexL3;
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assert(dictMatchL3 < dictEnd);
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if (dictMatchL3 > dictStart && MEM_read64(dictMatchL3) == MEM_read64(ip+1)) {
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mLength = ZSTD_count_2segments(ip+1+8, dictMatchL3+8, iend, dictEnd, prefixLowest) + 8;
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ip++;
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offset = (U32)(curr + 1 - dictMatchIndexL3 - dictIndexDelta);
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while (((ip>anchor) & (dictMatchL3>dictStart)) && (ip[-1] == dictMatchL3[-1])) { ip--; dictMatchL3--; mLength++; } /* catch up */
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goto _match_found;
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} } }
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/* if no long +1 match, explore the short match we found */
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if (matchIndexS < prefixLowestIndex) {
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mLength = ZSTD_count_2segments(ip+4, match+4, iend, dictEnd, prefixLowest) + 4;
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offset = (U32)(curr - matchIndexS);
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while (((ip>anchor) & (match>dictStart)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
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} else {
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mLength = ZSTD_count(ip+4, match+4, iend) + 4;
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offset = (U32)(ip - match);
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while (((ip>anchor) & (match>prefixLowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
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}
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_match_found:
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offset_2 = offset_1;
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offset_1 = offset;
|
|
|
|
ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
|
|
|
|
_match_stored:
|
|
/* match found */
|
|
ip += mLength;
|
|
anchor = ip;
|
|
|
|
if (ip <= ilimit) {
|
|
/* Complementary insertion */
|
|
/* done after iLimit test, as candidates could be > iend-8 */
|
|
{ U32 const indexToInsert = curr+2;
|
|
hashLong[ZSTD_hashPtr(base+indexToInsert, hBitsL, 8)] = indexToInsert;
|
|
hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base);
|
|
hashSmall[ZSTD_hashPtr(base+indexToInsert, hBitsS, mls)] = indexToInsert;
|
|
hashSmall[ZSTD_hashPtr(ip-1, hBitsS, mls)] = (U32)(ip-1-base);
|
|
}
|
|
|
|
/* check immediate repcode */
|
|
while (ip <= ilimit) {
|
|
U32 const current2 = (U32)(ip-base);
|
|
U32 const repIndex2 = current2 - offset_2;
|
|
const BYTE* repMatch2 = repIndex2 < prefixLowestIndex ?
|
|
dictBase + repIndex2 - dictIndexDelta :
|
|
base + repIndex2;
|
|
if ( ((U32)((prefixLowestIndex-1) - (U32)repIndex2) >= 3 /* intentional overflow */)
|
|
&& (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
|
|
const BYTE* const repEnd2 = repIndex2 < prefixLowestIndex ? dictEnd : iend;
|
|
size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixLowest) + 4;
|
|
U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
|
|
ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, repLength2);
|
|
hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
|
|
hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
|
|
ip += repLength2;
|
|
anchor = ip;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
} /* while (ip < ilimit) */
|
|
|
|
/* save reps for next block */
|
|
rep[0] = offset_1 ? offset_1 : offsetSaved;
|
|
rep[1] = offset_2 ? offset_2 : offsetSaved;
|
|
|
|
/* Return the last literals size */
|
|
return (size_t)(iend - anchor);
|
|
}
|
|
|
|
#define ZSTD_GEN_DFAST_FN(dictMode, mls) \
|
|
static size_t ZSTD_compressBlock_doubleFast_##dictMode##_##mls( \
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM], \
|
|
void const* src, size_t srcSize) \
|
|
{ \
|
|
return ZSTD_compressBlock_doubleFast_##dictMode##_generic(ms, seqStore, rep, src, srcSize, mls); \
|
|
}
|
|
|
|
ZSTD_GEN_DFAST_FN(noDict, 4)
|
|
ZSTD_GEN_DFAST_FN(noDict, 5)
|
|
ZSTD_GEN_DFAST_FN(noDict, 6)
|
|
ZSTD_GEN_DFAST_FN(noDict, 7)
|
|
|
|
ZSTD_GEN_DFAST_FN(dictMatchState, 4)
|
|
ZSTD_GEN_DFAST_FN(dictMatchState, 5)
|
|
ZSTD_GEN_DFAST_FN(dictMatchState, 6)
|
|
ZSTD_GEN_DFAST_FN(dictMatchState, 7)
|
|
|
|
|
|
size_t ZSTD_compressBlock_doubleFast(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
const U32 mls = ms->cParams.minMatch;
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_doubleFast_noDict_4(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_doubleFast_noDict_5(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_doubleFast_noDict_6(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_doubleFast_noDict_7(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
}
|
|
|
|
|
|
size_t ZSTD_compressBlock_doubleFast_dictMatchState(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
const U32 mls = ms->cParams.minMatch;
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_doubleFast_dictMatchState_4(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_doubleFast_dictMatchState_5(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_doubleFast_dictMatchState_6(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_doubleFast_dictMatchState_7(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_compressBlock_doubleFast_extDict_generic(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize,
|
|
U32 const mls /* template */)
|
|
{
|
|
ZSTD_compressionParameters const* cParams = &ms->cParams;
|
|
U32* const hashLong = ms->hashTable;
|
|
U32 const hBitsL = cParams->hashLog;
|
|
U32* const hashSmall = ms->chainTable;
|
|
U32 const hBitsS = cParams->chainLog;
|
|
const BYTE* const istart = (const BYTE*)src;
|
|
const BYTE* ip = istart;
|
|
const BYTE* anchor = istart;
|
|
const BYTE* const iend = istart + srcSize;
|
|
const BYTE* const ilimit = iend - 8;
|
|
const BYTE* const base = ms->window.base;
|
|
const U32 endIndex = (U32)((size_t)(istart - base) + srcSize);
|
|
const U32 lowLimit = ZSTD_getLowestMatchIndex(ms, endIndex, cParams->windowLog);
|
|
const U32 dictStartIndex = lowLimit;
|
|
const U32 dictLimit = ms->window.dictLimit;
|
|
const U32 prefixStartIndex = (dictLimit > lowLimit) ? dictLimit : lowLimit;
|
|
const BYTE* const prefixStart = base + prefixStartIndex;
|
|
const BYTE* const dictBase = ms->window.dictBase;
|
|
const BYTE* const dictStart = dictBase + dictStartIndex;
|
|
const BYTE* const dictEnd = dictBase + prefixStartIndex;
|
|
U32 offset_1=rep[0], offset_2=rep[1];
|
|
|
|
DEBUGLOG(5, "ZSTD_compressBlock_doubleFast_extDict_generic (srcSize=%zu)", srcSize);
|
|
|
|
/* if extDict is invalidated due to maxDistance, switch to "regular" variant */
|
|
if (prefixStartIndex == dictStartIndex)
|
|
return ZSTD_compressBlock_doubleFast(ms, seqStore, rep, src, srcSize);
|
|
|
|
/* Search Loop */
|
|
while (ip < ilimit) { /* < instead of <=, because (ip+1) */
|
|
const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls);
|
|
const U32 matchIndex = hashSmall[hSmall];
|
|
const BYTE* const matchBase = matchIndex < prefixStartIndex ? dictBase : base;
|
|
const BYTE* match = matchBase + matchIndex;
|
|
|
|
const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8);
|
|
const U32 matchLongIndex = hashLong[hLong];
|
|
const BYTE* const matchLongBase = matchLongIndex < prefixStartIndex ? dictBase : base;
|
|
const BYTE* matchLong = matchLongBase + matchLongIndex;
|
|
|
|
const U32 curr = (U32)(ip-base);
|
|
const U32 repIndex = curr + 1 - offset_1; /* offset_1 expected <= curr +1 */
|
|
const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base;
|
|
const BYTE* const repMatch = repBase + repIndex;
|
|
size_t mLength;
|
|
hashSmall[hSmall] = hashLong[hLong] = curr; /* update hash table */
|
|
|
|
if ((((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow : ensure repIndex doesn't overlap dict + prefix */
|
|
& (offset_1 <= curr+1 - dictStartIndex)) /* note: we are searching at curr+1 */
|
|
&& (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
|
|
const BYTE* repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
|
|
mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4;
|
|
ip++;
|
|
ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_REPCODE_1, mLength);
|
|
} else {
|
|
if ((matchLongIndex > dictStartIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) {
|
|
const BYTE* const matchEnd = matchLongIndex < prefixStartIndex ? dictEnd : iend;
|
|
const BYTE* const lowMatchPtr = matchLongIndex < prefixStartIndex ? dictStart : prefixStart;
|
|
U32 offset;
|
|
mLength = ZSTD_count_2segments(ip+8, matchLong+8, iend, matchEnd, prefixStart) + 8;
|
|
offset = curr - matchLongIndex;
|
|
while (((ip>anchor) & (matchLong>lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
|
|
offset_2 = offset_1;
|
|
offset_1 = offset;
|
|
ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
|
|
|
|
} else if ((matchIndex > dictStartIndex) && (MEM_read32(match) == MEM_read32(ip))) {
|
|
size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
|
|
U32 const matchIndex3 = hashLong[h3];
|
|
const BYTE* const match3Base = matchIndex3 < prefixStartIndex ? dictBase : base;
|
|
const BYTE* match3 = match3Base + matchIndex3;
|
|
U32 offset;
|
|
hashLong[h3] = curr + 1;
|
|
if ( (matchIndex3 > dictStartIndex) && (MEM_read64(match3) == MEM_read64(ip+1)) ) {
|
|
const BYTE* const matchEnd = matchIndex3 < prefixStartIndex ? dictEnd : iend;
|
|
const BYTE* const lowMatchPtr = matchIndex3 < prefixStartIndex ? dictStart : prefixStart;
|
|
mLength = ZSTD_count_2segments(ip+9, match3+8, iend, matchEnd, prefixStart) + 8;
|
|
ip++;
|
|
offset = curr+1 - matchIndex3;
|
|
while (((ip>anchor) & (match3>lowMatchPtr)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */
|
|
} else {
|
|
const BYTE* const matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend;
|
|
const BYTE* const lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart;
|
|
mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4;
|
|
offset = curr - matchIndex;
|
|
while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
|
|
}
|
|
offset_2 = offset_1;
|
|
offset_1 = offset;
|
|
ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
|
|
|
|
} else {
|
|
ip += ((ip-anchor) >> kSearchStrength) + 1;
|
|
continue;
|
|
} }
|
|
|
|
/* move to next sequence start */
|
|
ip += mLength;
|
|
anchor = ip;
|
|
|
|
if (ip <= ilimit) {
|
|
/* Complementary insertion */
|
|
/* done after iLimit test, as candidates could be > iend-8 */
|
|
{ U32 const indexToInsert = curr+2;
|
|
hashLong[ZSTD_hashPtr(base+indexToInsert, hBitsL, 8)] = indexToInsert;
|
|
hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base);
|
|
hashSmall[ZSTD_hashPtr(base+indexToInsert, hBitsS, mls)] = indexToInsert;
|
|
hashSmall[ZSTD_hashPtr(ip-1, hBitsS, mls)] = (U32)(ip-1-base);
|
|
}
|
|
|
|
/* check immediate repcode */
|
|
while (ip <= ilimit) {
|
|
U32 const current2 = (U32)(ip-base);
|
|
U32 const repIndex2 = current2 - offset_2;
|
|
const BYTE* repMatch2 = repIndex2 < prefixStartIndex ? dictBase + repIndex2 : base + repIndex2;
|
|
if ( (((U32)((prefixStartIndex-1) - repIndex2) >= 3) /* intentional overflow : ensure repIndex2 doesn't overlap dict + prefix */
|
|
& (offset_2 <= current2 - dictStartIndex))
|
|
&& (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
|
|
const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
|
|
size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4;
|
|
U32 const tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
|
|
ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, repLength2);
|
|
hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
|
|
hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
|
|
ip += repLength2;
|
|
anchor = ip;
|
|
continue;
|
|
}
|
|
break;
|
|
} } }
|
|
|
|
/* save reps for next block */
|
|
rep[0] = offset_1;
|
|
rep[1] = offset_2;
|
|
|
|
/* Return the last literals size */
|
|
return (size_t)(iend - anchor);
|
|
}
|
|
|
|
ZSTD_GEN_DFAST_FN(extDict, 4)
|
|
ZSTD_GEN_DFAST_FN(extDict, 5)
|
|
ZSTD_GEN_DFAST_FN(extDict, 6)
|
|
ZSTD_GEN_DFAST_FN(extDict, 7)
|
|
|
|
size_t ZSTD_compressBlock_doubleFast_extDict(
|
|
ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
|
|
void const* src, size_t srcSize)
|
|
{
|
|
U32 const mls = ms->cParams.minMatch;
|
|
switch(mls)
|
|
{
|
|
default: /* includes case 3 */
|
|
case 4 :
|
|
return ZSTD_compressBlock_doubleFast_extDict_4(ms, seqStore, rep, src, srcSize);
|
|
case 5 :
|
|
return ZSTD_compressBlock_doubleFast_extDict_5(ms, seqStore, rep, src, srcSize);
|
|
case 6 :
|
|
return ZSTD_compressBlock_doubleFast_extDict_6(ms, seqStore, rep, src, srcSize);
|
|
case 7 :
|
|
return ZSTD_compressBlock_doubleFast_extDict_7(ms, seqStore, rep, src, srcSize);
|
|
}
|
|
}
|