/* seqStoreSeqs[i].offset == offCode+1, and ZSTD_updateRep() expects offCode
so we provide seqStoreSeqs[i].offset - 1 */
ZSTD_updateRep(updatedRepcodes.rep,
- seqStoreSeqs[i].offBase - 1,
+ seqStoreSeqs[i].offBase,
seqStoreSeqs[i].litLength == 0);
literalsRead += outSeqs[i].litLength;
}
}
/**
- * Returns the raw offset represented by the combination of offCode, ll0, and repcode history.
- * offCode must represent a repcode in the numeric representation of ZSTD_storeSeq().
+ * Returns the raw offset represented by the combination of offBase, ll0, and repcode history.
+ * offBase must represent a repcode in the numeric representation of ZSTD_storeSeq().
*/
static U32
-ZSTD_resolveRepcodeToRawOffset(const U32 rep[ZSTD_REP_NUM], const U32 offCode, const U32 ll0)
+ZSTD_resolveRepcodeToRawOffset(const U32 rep[ZSTD_REP_NUM], const U32 offBase, const U32 ll0)
{
- U32 const adjustedOffCode = STORED_REPCODE(offCode) - 1 + ll0; /* [ 0 - 3 ] */
- assert(STORED_IS_REPCODE(offCode));
- if (adjustedOffCode == ZSTD_REP_NUM) {
- /* litlength == 0 and offCode == 2 implies selection of first repcode - 1 */
- assert(rep[0] > 0);
+ U32 const adjustedRepCode = OFFBASE_TO_REPCODE(offBase) - 1 + ll0; /* [ 0 - 3 ] */
+ assert(OFFBASE_IS_REPCODE(offBase));
+ if (adjustedRepCode == ZSTD_REP_NUM) {
+ /* litlength == 0 and offCode == 2 implies selection of first repcode - 1
+ * This is only valid if it results in a valid offset value, aka > 0.
+ */
+ assert(rep[0] > 1);
return rep[0] - 1;
}
- return rep[adjustedOffCode];
+ return rep[adjustedRepCode];
}
/**
for (; idx < nbSeq; ++idx) {
seqDef* const seq = seqStore->sequencesStart + idx;
U32 const ll0 = (seq->litLength == 0);
- U32 const offCode = OFFBASE_TO_STORED(seq->offBase);
+ U32 const offBase = seq->offBase;
assert(seq->offBase > 0);
- if (STORED_IS_REPCODE(offCode)) {
- U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offCode, ll0);
- U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offCode, ll0);
+ if (OFFBASE_IS_REPCODE(offBase)) {
+ U32 const dRawOffset = ZSTD_resolveRepcodeToRawOffset(dRepcodes->rep, offBase, ll0);
+ U32 const cRawOffset = ZSTD_resolveRepcodeToRawOffset(cRepcodes->rep, offBase, ll0);
/* Adjust simulated decompression repcode history if we come across a mismatch. Replace
* the repcode with the offset it actually references, determined by the compression
* repcode history.
/* Compression repcode history is always updated with values directly from the unmodified seqStore.
* Decompression repcode history may use modified seq->offset value taken from compression repcode history.
*/
- ZSTD_updateRep(dRepcodes->rep, OFFBASE_TO_STORED(seq->offBase), ll0);
- ZSTD_updateRep(cRepcodes->rep, offCode, ll0);
+ ZSTD_updateRep(dRepcodes->rep, seq->offBase, ll0);
+ ZSTD_updateRep(cRepcodes->rep, offBase, ll0);
}
}
* window size. After output surpasses windowSize, we're limited to windowSize offsets again.
*/
size_t const offsetBound = posInSrc > windowSize ? (size_t)windowSize : posInSrc + (size_t)dictSize;
- RETURN_ERROR_IF(offCode > STORE_OFFSET(offsetBound), corruption_detected, "Offset too large!");
+ RETURN_ERROR_IF(offCode > OFFSET_TO_OFFBASE(offsetBound), corruption_detected, "Offset too large!");
RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small");
return 0;
}
/* Returns an offset code, given a sequence's raw offset, the ongoing repcode array, and whether litLength == 0 */
-static U32 ZSTD_finalizeOffCode(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0)
+static U32 ZSTD_finalizeOffBase(U32 rawOffset, const U32 rep[ZSTD_REP_NUM], U32 ll0)
{
- U32 offCode = STORE_OFFSET(rawOffset);
+ U32 offBase = OFFSET_TO_OFFBASE(rawOffset);
if (!ll0 && rawOffset == rep[0]) {
- offCode = STORE_REPCODE_1;
+ offBase = REPCODE1_TO_OFFBASE;
} else if (rawOffset == rep[1]) {
- offCode = STORE_REPCODE(2 - ll0);
+ offBase = REPCODE_TO_OFFBASE(2 - ll0);
} else if (rawOffset == rep[2]) {
- offCode = STORE_REPCODE(3 - ll0);
+ offBase = REPCODE_TO_OFFBASE(3 - ll0);
} else if (ll0 && rawOffset == rep[0] - 1) {
- offCode = STORE_REPCODE_3;
+ offBase = REPCODE3_TO_OFFBASE;
}
- return offCode;
+ return offBase;
}
/* Returns 0 on success, and a ZSTD_error otherwise. This function scans through an array of
U32 const litLength = inSeqs[idx].litLength;
U32 const ll0 = (litLength == 0);
U32 const matchLength = inSeqs[idx].matchLength;
- U32 const offCode = ZSTD_finalizeOffCode(inSeqs[idx].offset, updatedRepcodes.rep, ll0);
- ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
+ U32 const offBase = ZSTD_finalizeOffBase(inSeqs[idx].offset, updatedRepcodes.rep, ll0);
+ ZSTD_updateRep(updatedRepcodes.rep, offBase, ll0);
- DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
+ DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offBase, matchLength, litLength);
if (cctx->appliedParams.validateSequences) {
seqPos->posInSrc += litLength + matchLength;
- FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
+ FORWARD_IF_ERROR(ZSTD_validateSequence(offBase, matchLength, seqPos->posInSrc,
cctx->appliedParams.cParams.windowLog, dictSize),
"Sequence validation failed");
}
RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
"Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
- ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength);
+ ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offBase, matchLength);
ip += matchLength + litLength;
}
ZSTD_memcpy(cctx->blockState.nextCBlock->rep, updatedRepcodes.rep, sizeof(repcodes_t));
U32 litLength = currSeq.litLength;
U32 matchLength = currSeq.matchLength;
U32 const rawOffset = currSeq.offset;
- U32 offCode;
+ U32 offBase;
/* Modify the sequence depending on where endPosInSequence lies */
if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) {
}
/* Check if this offset can be represented with a repcode */
{ U32 const ll0 = (litLength == 0);
- offCode = ZSTD_finalizeOffCode(rawOffset, updatedRepcodes.rep, ll0);
- ZSTD_updateRep(updatedRepcodes.rep, offCode, ll0);
+ offBase = ZSTD_finalizeOffBase(rawOffset, updatedRepcodes.rep, ll0);
+ ZSTD_updateRep(updatedRepcodes.rep, offBase, ll0);
}
if (cctx->appliedParams.validateSequences) {
seqPos->posInSrc += litLength + matchLength;
- FORWARD_IF_ERROR(ZSTD_validateSequence(offCode, matchLength, seqPos->posInSrc,
+ FORWARD_IF_ERROR(ZSTD_validateSequence(offBase, matchLength, seqPos->posInSrc,
cctx->appliedParams.cParams.windowLog, dictSize),
"Sequence validation failed");
}
- DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offCode, matchLength, litLength);
+ DEBUGLOG(6, "Storing sequence: (of: %u, ml: %u, ll: %u)", offBase, matchLength, litLength);
RETURN_ERROR_IF(idx - seqPos->idx > cctx->seqStore.maxNbSeq, memory_allocation,
"Not enough memory allocated. Try adjusting ZSTD_c_minMatch.");
- ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offCode, matchLength);
+ ZSTD_storeSeq(&cctx->seqStore, litLength, ip, iend, offBase, matchLength);
ip += matchLength + litLength;
}
DEBUGLOG(5, "Ending seq: idx: %u (of: %u ml: %u ll: %u)", idx, inSeqs[idx].offset, inSeqs[idx].matchLength, inSeqs[idx].litLength);
while (ip < iend) *op++ = *ip++;
}
-#define STORE_REPCODE_1 STORE_REPCODE(1)
-#define STORE_REPCODE_2 STORE_REPCODE(2)
-#define STORE_REPCODE_3 STORE_REPCODE(3)
-#define STORE_REPCODE(r) (assert((r)>=1), assert((r)<=ZSTD_REP_NUM), (r)) /* accepts IDs 1,2,3 */
-#define STORE_OFFSET(o) (assert((o)>0), o + ZSTD_REP_NUM)
-#define STORED_IS_OFFSET(o) ((o) > ZSTD_REP_NUM)
-#define STORED_IS_REPCODE(o) ( 1 <= (o) && (o) <= ZSTD_REP_NUM)
-#define STORED_OFFSET(o) (assert(STORED_IS_OFFSET(o)), (o) - ZSTD_REP_NUM)
-#define STORED_REPCODE(o) (assert(STORED_IS_REPCODE(o)), (o)) /* returns ID 1,2,3 */
-#define STORED_TO_OFFBASE(o) (o)
-#define OFFBASE_TO_STORED(o) (o)
+
+#define REPCODE1_TO_OFFBASE REPCODE_TO_OFFBASE(1)
+#define REPCODE2_TO_OFFBASE REPCODE_TO_OFFBASE(2)
+#define REPCODE3_TO_OFFBASE REPCODE_TO_OFFBASE(3)
+#define REPCODE_TO_OFFBASE(r) (assert((r)>=1), assert((r)<=ZSTD_REP_NUM), (r)) /* accepts IDs 1,2,3 */
+#define OFFSET_TO_OFFBASE(o) (assert((o)>0), o + ZSTD_REP_NUM)
+#define OFFBASE_IS_OFFSET(o) ((o) > ZSTD_REP_NUM)
+#define OFFBASE_IS_REPCODE(o) ( 1 <= (o) && (o) <= ZSTD_REP_NUM)
+#define OFFBASE_TO_OFFSET(o) (assert(OFFBASE_IS_OFFSET(o)), (o) - ZSTD_REP_NUM)
+#define OFFBASE_TO_REPCODE(o) (assert(OFFBASE_IS_REPCODE(o)), (o)) /* returns ID 1,2,3 */
/*! ZSTD_storeSeq() :
- * Store a sequence (litlen, litPtr, offCode and matchLength) into seqStore_t.
- * @offBase_minus1 : Users should use employ macros STORE_REPCODE_X and STORE_OFFSET().
+ * Store a sequence (litlen, litPtr, offBase and matchLength) into seqStore_t.
+ * @offBase : Users should employ macros REPCODE_TO_OFFBASE() and OFFSET_TO_OFFBASE().
* @matchLength : must be >= MINMATCH
- * Allowed to overread literals up to litLimit.
+ * Allowed to over-read literals up to litLimit.
*/
HINT_INLINE UNUSED_ATTR void
ZSTD_storeSeq(seqStore_t* seqStorePtr,
size_t litLength, const BYTE* literals, const BYTE* litLimit,
- U32 offBase_minus1,
+ U32 offBase,
size_t matchLength)
{
BYTE const* const litLimit_w = litLimit - WILDCOPY_OVERLENGTH;
static const BYTE* g_start = NULL;
if (g_start==NULL) g_start = (const BYTE*)literals; /* note : index only works for compression within a single segment */
{ U32 const pos = (U32)((const BYTE*)literals - g_start);
- DEBUGLOG(6, "Cpos%7u :%3u literals, match%4u bytes at offCode%7u",
- pos, (U32)litLength, (U32)matchLength, (U32)offBase_minus1);
+ DEBUGLOG(6, "Cpos%7u :%3u literals, match%4u bytes at offBase%7u",
+ pos, (U32)litLength, (U32)matchLength, (U32)offBase);
}
#endif
assert((size_t)(seqStorePtr->sequences - seqStorePtr->sequencesStart) < seqStorePtr->maxNbSeq);
assert(literals + litLength <= litLimit);
if (litEnd <= litLimit_w) {
/* Common case we can use wildcopy.
- * First copy 16 bytes, because literals are likely short.
- */
- assert(WILDCOPY_OVERLENGTH >= 16);
+ * First copy 16 bytes, because literals are likely short.
+ */
+ ZSTD_STATIC_ASSERT(WILDCOPY_OVERLENGTH >= 16);
ZSTD_copy16(seqStorePtr->lit, literals);
if (litLength > 16) {
ZSTD_wildcopy(seqStorePtr->lit+16, literals+16, (ptrdiff_t)litLength-16, ZSTD_no_overlap);
seqStorePtr->sequences[0].litLength = (U16)litLength;
/* match offset */
- seqStorePtr->sequences[0].offBase = STORED_TO_OFFBASE(offBase_minus1);
+ seqStorePtr->sequences[0].offBase = offBase;
/* match Length */
assert(matchLength >= MINMATCH);
/* ZSTD_updateRep() :
* updates in-place @rep (array of repeat offsets)
- * @offBase_minus1 : sum-type, with same numeric representation as ZSTD_storeSeq()
+ * @offBase : sum-type, using numeric representation of ZSTD_storeSeq()
*/
MEM_STATIC void
-ZSTD_updateRep(U32 rep[ZSTD_REP_NUM], U32 const offBase_minus1, U32 const ll0)
+ZSTD_updateRep(U32 rep[ZSTD_REP_NUM], U32 const offBase, U32 const ll0)
{
- if (STORED_IS_OFFSET(offBase_minus1)) { /* full offset */
+ if (OFFBASE_IS_OFFSET(offBase)) { /* full offset */
rep[2] = rep[1];
rep[1] = rep[0];
- rep[0] = STORED_OFFSET(offBase_minus1);
+ rep[0] = OFFBASE_TO_OFFSET(offBase);
} else { /* repcode */
- U32 const repCode = STORED_REPCODE(offBase_minus1) - 1 + ll0;
+ U32 const repCode = OFFBASE_TO_REPCODE(offBase) - 1 + ll0;
if (repCode > 0) { /* note : if repCode==0, no change */
U32 const currentOffset = (repCode==ZSTD_REP_NUM) ? (rep[0] - 1) : rep[repCode];
rep[2] = (repCode >= 2) ? rep[1] : rep[2];
} repcodes_t;
MEM_STATIC repcodes_t
-ZSTD_newRep(U32 const rep[ZSTD_REP_NUM], U32 const offBase_minus1, U32 const ll0)
+ZSTD_newRep(U32 const rep[ZSTD_REP_NUM], U32 const offBase, U32 const ll0)
{
repcodes_t newReps;
ZSTD_memcpy(&newReps, rep, sizeof(newReps));
- ZSTD_updateRep(newReps.rep, offBase_minus1, ll0);
+ ZSTD_updateRep(newReps.rep, offBase, ll0);
return newReps;
}
* @return : compressed size of literals section of a sub-block
* Or 0 if it unable to compress.
* Or error code */
-static size_t ZSTD_compressSubBlock_literal(const HUF_CElt* hufTable,
- const ZSTD_hufCTablesMetadata_t* hufMetadata,
- const BYTE* literals, size_t litSize,
- void* dst, size_t dstSize,
- const int bmi2, int writeEntropy, int* entropyWritten)
+static size_t
+ZSTD_compressSubBlock_literal(const HUF_CElt* hufTable,
+ const ZSTD_hufCTablesMetadata_t* hufMetadata,
+ const BYTE* literals, size_t litSize,
+ void* dst, size_t dstSize,
+ const int bmi2, int writeEntropy, int* entropyWritten)
{
size_t const header = writeEntropy ? 200 : 0;
size_t const lhSize = 3 + (litSize >= (1 KB - header)) + (litSize >= (16 KB - header));
return op-ostart;
}
-static size_t ZSTD_seqDecompressedSize(seqStore_t const* seqStore, const seqDef* sequences, size_t nbSeq, size_t litSize, int lastSequence) {
+static size_t
+ZSTD_seqDecompressedSize(seqStore_t const* seqStore,
+ const seqDef* sequences, size_t nbSeq,
+ size_t litSize, int lastSequence)
+{
const seqDef* const sstart = sequences;
const seqDef* const send = sequences + nbSeq;
const seqDef* sp = sstart;
* @return : compressed size of sequences section of a sub-block
* Or 0 if it is unable to compress
* Or error code. */
-static size_t ZSTD_compressSubBlock_sequences(const ZSTD_fseCTables_t* fseTables,
- const ZSTD_fseCTablesMetadata_t* fseMetadata,
- const seqDef* sequences, size_t nbSeq,
- const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode,
- const ZSTD_CCtx_params* cctxParams,
- void* dst, size_t dstCapacity,
- const int bmi2, int writeEntropy, int* entropyWritten)
+static size_t
+ZSTD_compressSubBlock_sequences(const ZSTD_fseCTables_t* fseTables,
+ const ZSTD_fseCTablesMetadata_t* fseMetadata,
+ const seqDef* sequences, size_t nbSeq,
+ const BYTE* llCode, const BYTE* mlCode, const BYTE* ofCode,
+ const ZSTD_CCtx_params* cctxParams,
+ void* dst, size_t dstCapacity,
+ const int bmi2, int writeEntropy, int* entropyWritten)
{
const int longOffsets = cctxParams->cParams.windowLog > STREAM_ACCUMULATOR_MIN;
BYTE* const ostart = (BYTE*)dst;
repcodes_t rep;
ZSTD_memcpy(&rep, prevCBlock->rep, sizeof(rep));
for (seq = sstart; seq < sp; ++seq) {
- ZSTD_updateRep(rep.rep, seq->offBase - 1, ZSTD_getSequenceLength(seqStorePtr, seq).litLength == 0);
+ ZSTD_updateRep(rep.rep, seq->offBase, ZSTD_getSequenceLength(seqStorePtr, seq).litLength == 0);
}
ZSTD_memcpy(nextCBlock->rep, &rep, sizeof(rep));
}
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(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_REPCODE_1, mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, REPCODE1_TO_OFFBASE, mLength);
goto _match_stored;
}
hashLong[hl1] = (U32)(ip1 - base);
}
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
_match_stored:
/* match found */
U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; /* swap offset_2 <=> offset_1 */
hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base);
hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base);
- ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, rLength);
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, rLength);
ip += rLength;
anchor = ip;
continue; /* faster when present ... (?) */
const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend;
mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4;
ip++;
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_REPCODE_1, mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, REPCODE1_TO_OFFBASE, mLength);
goto _match_stored;
}
offset_2 = offset_1;
offset_1 = offset;
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
_match_stored:
/* match found */
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);
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
ip += repLength2;
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);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, REPCODE1_TO_OFFBASE, mLength);
} else {
if ((matchLongIndex > dictStartIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) {
const BYTE* const matchEnd = matchLongIndex < prefixStartIndex ? dictEnd : iend;
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);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
} else if ((matchIndex > dictStartIndex) && (MEM_read32(match) == MEM_read32(ip))) {
size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
}
offset_2 = offset_1;
offset_1 = offset;
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
} else {
ip += ((ip-anchor) >> kSearchStrength) + 1;
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);
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
ip += repLength2;
mLength = ip0[-1] == match0[-1];
ip0 -= mLength;
match0 -= mLength;
- offcode = STORE_REPCODE_1;
+ offcode = REPCODE1_TO_OFFBASE;
mLength += 4;
goto _match;
}
match0 = base + idx;
rep_offset2 = rep_offset1;
rep_offset1 = (U32)(ip0-match0);
- offcode = STORE_OFFSET(rep_offset1);
+ offcode = OFFSET_TO_OFFBASE(rep_offset1);
mLength = 4;
/* Count the backwards match length. */
{ U32 const tmpOff = rep_offset2; rep_offset2 = rep_offset1; rep_offset1 = tmpOff; } /* swap rep_offset2 <=> rep_offset1 */
hashTable[ZSTD_hashPtr(ip0, hlog, mls)] = (U32)(ip0-base);
ip0 += rLength;
- ZSTD_storeSeq(seqStore, 0 /*litLen*/, anchor, iend, STORE_REPCODE_1, rLength);
+ ZSTD_storeSeq(seqStore, 0 /*litLen*/, anchor, iend, REPCODE1_TO_OFFBASE, rLength);
anchor = ip0;
continue; /* faster when present (confirmed on gcc-8) ... (?) */
} } }
const BYTE* const 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);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, REPCODE1_TO_OFFBASE, mLength);
} else if ( (matchIndex <= prefixStartIndex) ) {
size_t const dictHash = ZSTD_hashPtr(ip, dictHLog, mls);
U32 const dictMatchIndex = dictHashTable[dictHash];
} /* catch up */
offset_2 = offset_1;
offset_1 = offset;
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
}
} else if (MEM_read32(match) != MEM_read32(ip)) {
/* it's not a match, and we're not going to check the dictionary */
&& (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);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
}
/* match found */
const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 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);
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2;
ip += repLength2;
anchor = ip;
const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
size_t const rLength = 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, rLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, REPCODE1_TO_OFFBASE, rLength);
ip += rLength;
anchor = ip;
} else {
size_t mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4;
while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
offset_2 = offset_1; offset_1 = offset; /* update offset history */
- ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, STORE_OFFSET(offset), mLength);
+ ZSTD_storeSeq(seqStore, (size_t)(ip-anchor), anchor, iend, OFFSET_TO_OFFBASE(offset), mLength);
ip += mLength;
anchor = 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 /*litlen*/, anchor, iend, STORE_REPCODE_1, repLength2);
+ ZSTD_storeSeq(seqStore, 0 /*litlen*/, anchor, iend, REPCODE1_TO_OFFBASE, repLength2);
hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2;
ip += repLength2;
anchor = ip;
U32 matchIndex = dictMatchIndex + dictIndexDelta;
if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(curr-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) ) {
DEBUGLOG(9, "ZSTD_DUBT_findBetterDictMatch(%u) : found better match length %u -> %u and offsetCode %u -> %u (dictMatchIndex %u, matchIndex %u)",
- curr, (U32)bestLength, (U32)matchLength, (U32)*offsetPtr, STORE_OFFSET(curr - matchIndex), dictMatchIndex, matchIndex);
- bestLength = matchLength, *offsetPtr = STORE_OFFSET(curr - matchIndex);
+ curr, (U32)bestLength, (U32)matchLength, (U32)*offsetPtr, OFFSET_TO_OFFBASE(curr - matchIndex), dictMatchIndex, matchIndex);
+ bestLength = matchLength, *offsetPtr = OFFSET_TO_OFFBASE(curr - matchIndex);
}
if (ip+matchLength == iend) { /* reached end of input : ip[matchLength] is not valid, no way to know if it's larger or smaller than match */
break; /* drop, to guarantee consistency (miss a little bit of compression) */
}
if (bestLength >= MINMATCH) {
- U32 const mIndex = curr - (U32)STORED_OFFSET(*offsetPtr); (void)mIndex;
+ U32 const mIndex = curr - (U32)OFFBASE_TO_OFFSET(*offsetPtr); (void)mIndex;
DEBUGLOG(8, "ZSTD_DUBT_findBetterDictMatch(%u) : found match of length %u and offsetCode %u (pos %u)",
curr, (U32)bestLength, (U32)*offsetPtr, mIndex);
}
if (matchLength > matchEndIdx - matchIndex)
matchEndIdx = matchIndex + (U32)matchLength;
if ( (4*(int)(matchLength-bestLength)) > (int)(ZSTD_highbit32(curr-matchIndex+1) - ZSTD_highbit32((U32)offsetPtr[0]+1)) )
- bestLength = matchLength, *offsetPtr = STORE_OFFSET(curr - matchIndex);
+ bestLength = matchLength, *offsetPtr = OFFSET_TO_OFFBASE(curr - matchIndex);
if (ip+matchLength == iend) { /* equal : no way to know if inf or sup */
if (dictMode == ZSTD_dictMatchState) {
nbCompares = 0; /* in addition to avoiding checking any
assert(matchEndIdx > curr+8); /* ensure nextToUpdate is increased */
ms->nextToUpdate = matchEndIdx - 8; /* skip repetitive patterns */
if (bestLength >= MINMATCH) {
- U32 const mIndex = curr - (U32)STORED_OFFSET(*offsetPtr); (void)mIndex;
+ U32 const mIndex = curr - (U32)OFFBASE_TO_OFFSET(*offsetPtr); (void)mIndex;
DEBUGLOG(8, "ZSTD_DUBT_findBestMatch(%u) : found match of length %u and offsetCode %u (pos %u)",
curr, (U32)bestLength, (U32)*offsetPtr, mIndex);
}
/* save best solution */
if (currentMl > ml) {
ml = currentMl;
- *offsetPtr = STORE_OFFSET(curr - (matchIndex + ddsIndexDelta));
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - (matchIndex + ddsIndexDelta));
if (ip+currentMl == iLimit) {
/* best possible, avoids read overflow on next attempt */
return ml;
/* save best solution */
if (currentMl > ml) {
ml = currentMl;
- *offsetPtr = STORE_OFFSET(curr - (matchIndex + ddsIndexDelta));
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - (matchIndex + ddsIndexDelta));
if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */
}
}
/* save best solution */
if (currentMl > ml) {
ml = currentMl;
- *offsetPtr = STORE_OFFSET(curr - matchIndex);
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - matchIndex);
if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */
}
if (currentMl > ml) {
ml = currentMl;
assert(curr > matchIndex + dmsIndexDelta);
- *offsetPtr = STORE_OFFSET(curr - (matchIndex + dmsIndexDelta));
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - (matchIndex + dmsIndexDelta));
if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */
}
/* Save best solution */
if (currentMl > ml) {
ml = currentMl;
- *offsetPtr = STORE_OFFSET(curr - matchIndex);
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - matchIndex);
if (ip+currentMl == iLimit) break; /* best possible, avoids read overflow on next attempt */
}
}
if (currentMl > ml) {
ml = currentMl;
assert(curr > matchIndex + dmsIndexDelta);
- *offsetPtr = STORE_OFFSET(curr - (matchIndex + dmsIndexDelta));
+ *offsetPtr = OFFSET_TO_OFFBASE(curr - (matchIndex + dmsIndexDelta));
if (ip+currentMl == iLimit) break;
}
}
#endif
while (ip < ilimit) {
size_t matchLength=0;
- size_t offcode=STORE_REPCODE_1;
+ size_t offBase = REPCODE1_TO_OFFBASE;
const BYTE* start=ip+1;
DEBUGLOG(7, "search baseline (depth 0)");
}
/* first search (depth 0) */
- { size_t offsetFound = 999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offsetFound);
+ { size_t offbaseFound = 999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &offbaseFound);
if (ml2 > matchLength)
- matchLength = ml2, start = ip, offcode=offsetFound;
+ matchLength = ml2, start = ip, offBase = offbaseFound;
}
if (matchLength < 4) {
DEBUGLOG(7, "search depth 1");
ip ++;
if ( (dictMode == ZSTD_noDict)
- && (offcode) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
+ && (offBase) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4;
int const gain2 = (int)(mlRep * 3);
- int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offBase) + 1);
if ((mlRep >= 4) && (gain2 > gain1))
- matchLength = mlRep, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
}
if (isDxS) {
const U32 repIndex = (U32)(ip - base) - offset_1;
const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend;
size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4;
int const gain2 = (int)(mlRep * 3);
- int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offBase) + 1);
if ((mlRep >= 4) && (gain2 > gain1))
- matchLength = mlRep, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
}
}
- { size_t offset2=999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offset2);
- int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offset2))); /* raw approx */
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 4);
+ { size_t ofbCandidate=999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &ofbCandidate);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 4);
if ((ml2 >= 4) && (gain2 > gain1)) {
- matchLength = ml2, offcode = offset2, start = ip;
+ matchLength = ml2, offBase = ofbCandidate, start = ip;
continue; /* search a better one */
} }
DEBUGLOG(7, "search depth 2");
ip ++;
if ( (dictMode == ZSTD_noDict)
- && (offcode) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
+ && (offBase) && ((offset_1>0) & (MEM_read32(ip) == MEM_read32(ip - offset_1)))) {
size_t const mlRep = ZSTD_count(ip+4, ip+4-offset_1, iend) + 4;
int const gain2 = (int)(mlRep * 4);
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 1);
if ((mlRep >= 4) && (gain2 > gain1))
- matchLength = mlRep, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
}
if (isDxS) {
const U32 repIndex = (U32)(ip - base) - offset_1;
const BYTE* repMatchEnd = repIndex < prefixLowestIndex ? dictEnd : iend;
size_t const mlRep = ZSTD_count_2segments(ip+4, repMatch+4, iend, repMatchEnd, prefixLowest) + 4;
int const gain2 = (int)(mlRep * 4);
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 1);
if ((mlRep >= 4) && (gain2 > gain1))
- matchLength = mlRep, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = mlRep, offBase = REPCODE1_TO_OFFBASE, start = ip;
}
}
- { size_t offset2=999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offset2);
- int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offset2))); /* raw approx */
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 7);
+ { size_t ofbCandidate=999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &ofbCandidate);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 7);
if ((ml2 >= 4) && (gain2 > gain1)) {
- matchLength = ml2, offcode = offset2, start = ip;
+ matchLength = ml2, offBase = ofbCandidate, start = ip;
continue;
} } }
break; /* nothing found : store previous solution */
* notably if `value` is unsigned, resulting in a large positive `-value`.
*/
/* catch up */
- if (STORED_IS_OFFSET(offcode)) {
+ if (OFFBASE_IS_OFFSET(offBase)) {
if (dictMode == ZSTD_noDict) {
- while ( ((start > anchor) & (start - STORED_OFFSET(offcode) > prefixLowest))
- && (start[-1] == (start-STORED_OFFSET(offcode))[-1]) ) /* only search for offset within prefix */
+ while ( ((start > anchor) & (start - OFFBASE_TO_OFFSET(offBase) > prefixLowest))
+ && (start[-1] == (start-OFFBASE_TO_OFFSET(offBase))[-1]) ) /* only search for offset within prefix */
{ start--; matchLength++; }
}
if (isDxS) {
- U32 const matchIndex = (U32)((size_t)(start-base) - STORED_OFFSET(offcode));
+ U32 const matchIndex = (U32)((size_t)(start-base) - OFFBASE_TO_OFFSET(offBase));
const BYTE* match = (matchIndex < prefixLowestIndex) ? dictBase + matchIndex - dictIndexDelta : base + matchIndex;
const BYTE* const mStart = (matchIndex < prefixLowestIndex) ? dictLowest : prefixLowest;
while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */
}
- offset_2 = offset_1; offset_1 = (U32)STORED_OFFSET(offcode);
+ offset_2 = offset_1; offset_1 = (U32)OFFBASE_TO_OFFSET(offBase);
}
/* store sequence */
_storeSequence:
{ size_t const litLength = (size_t)(start - anchor);
- ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offcode, matchLength);
+ ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offBase, matchLength);
anchor = ip = start + matchLength;
}
&& (MEM_read32(repMatch) == MEM_read32(ip)) ) {
const BYTE* const repEnd2 = repIndex < prefixLowestIndex ? dictEnd : iend;
matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd2, prefixLowest) + 4;
- offcode = offset_2; offset_2 = offset_1; offset_1 = (U32)offcode; /* swap offset_2 <=> offset_1 */
- ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, matchLength);
+ offBase = offset_2; offset_2 = offset_1; offset_1 = (U32)offBase; /* swap offset_2 <=> offset_1 */
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, matchLength);
ip += matchLength;
anchor = ip;
continue;
&& (MEM_read32(ip) == MEM_read32(ip - offset_2)) ) {
/* store sequence */
matchLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
- offcode = offset_2; offset_2 = offset_1; offset_1 = (U32)offcode; /* swap repcodes */
- ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, matchLength);
+ offBase = offset_2; offset_2 = offset_1; offset_1 = (U32)offBase; /* swap repcodes */
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, matchLength);
ip += matchLength;
anchor = ip;
continue; /* faster when present ... (?) */
#endif
while (ip < ilimit) {
size_t matchLength=0;
- size_t offcode=STORE_REPCODE_1;
+ size_t offBase = REPCODE1_TO_OFFBASE;
const BYTE* start=ip+1;
U32 curr = (U32)(ip-base);
} }
/* first search (depth 0) */
- { size_t offsetFound = 999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offsetFound);
+ { size_t ofbCandidate = 999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &ofbCandidate);
if (ml2 > matchLength)
- matchLength = ml2, start = ip, offcode=offsetFound;
+ matchLength = ml2, start = ip, offBase = ofbCandidate;
}
if (matchLength < 4) {
ip ++;
curr++;
/* check repCode */
- if (offcode) {
+ if (offBase) {
const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr, windowLog);
const U32 repIndex = (U32)(curr - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4;
int const gain2 = (int)(repLength * 3);
- int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*3 - ZSTD_highbit32((U32)offBase) + 1);
if ((repLength >= 4) && (gain2 > gain1))
- matchLength = repLength, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = repLength, offBase = REPCODE1_TO_OFFBASE, start = ip;
} }
/* search match, depth 1 */
- { size_t offset2=999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offset2);
- int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offset2))); /* raw approx */
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 4);
+ { size_t ofbCandidate=999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &ofbCandidate);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 4);
if ((ml2 >= 4) && (gain2 > gain1)) {
- matchLength = ml2, offcode = offset2, start = ip;
+ matchLength = ml2, offBase = ofbCandidate, start = ip;
continue; /* search a better one */
} }
ip ++;
curr++;
/* check repCode */
- if (offcode) {
+ if (offBase) {
const U32 windowLow = ZSTD_getLowestMatchIndex(ms, curr, windowLog);
const U32 repIndex = (U32)(curr - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
size_t const repLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4;
int const gain2 = (int)(repLength * 4);
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 1);
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 1);
if ((repLength >= 4) && (gain2 > gain1))
- matchLength = repLength, offcode = STORE_REPCODE_1, start = ip;
+ matchLength = repLength, offBase = REPCODE1_TO_OFFBASE, start = ip;
} }
/* search match, depth 2 */
- { size_t offset2=999999999;
- size_t const ml2 = searchMax(ms, ip, iend, &offset2);
- int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offset2))); /* raw approx */
- int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)STORED_TO_OFFBASE(offcode)) + 7);
+ { size_t ofbCandidate=999999999;
+ size_t const ml2 = searchMax(ms, ip, iend, &ofbCandidate);
+ int const gain2 = (int)(ml2*4 - ZSTD_highbit32((U32)ofbCandidate)); /* raw approx */
+ int const gain1 = (int)(matchLength*4 - ZSTD_highbit32((U32)offBase) + 7);
if ((ml2 >= 4) && (gain2 > gain1)) {
- matchLength = ml2, offcode = offset2, start = ip;
+ matchLength = ml2, offBase = ofbCandidate, start = ip;
continue;
} } }
break; /* nothing found : store previous solution */
}
/* catch up */
- if (STORED_IS_OFFSET(offcode)) {
- U32 const matchIndex = (U32)((size_t)(start-base) - STORED_OFFSET(offcode));
+ if (OFFBASE_IS_OFFSET(offBase)) {
+ U32 const matchIndex = (U32)((size_t)(start-base) - OFFBASE_TO_OFFSET(offBase));
const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex;
const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart;
while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; } /* catch up */
- offset_2 = offset_1; offset_1 = (U32)STORED_OFFSET(offcode);
+ offset_2 = offset_1; offset_1 = (U32)OFFBASE_TO_OFFSET(offBase);
}
/* store sequence */
_storeSequence:
{ size_t const litLength = (size_t)(start - anchor);
- ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offcode, matchLength);
+ ZSTD_storeSeq(seqStore, litLength, anchor, iend, (U32)offBase, matchLength);
anchor = ip = start + matchLength;
}
/* repcode detected we should take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
matchLength = ZSTD_count_2segments(ip+4, repMatch+4, iend, repEnd, prefixStart) + 4;
- offcode = offset_2; offset_2 = offset_1; offset_1 = (U32)offcode; /* swap offset history */
- ZSTD_storeSeq(seqStore, 0, anchor, iend, STORE_REPCODE_1, matchLength);
+ offBase = offset_2; offset_2 = offset_1; offset_1 = (U32)offBase; /* swap offset history */
+ ZSTD_storeSeq(seqStore, 0, anchor, iend, REPCODE1_TO_OFFBASE, matchLength);
ip += matchLength;
anchor = ip;
continue; /* faster when present ... (?) */
rep[0] = sequence.offset;
/* Store the sequence */
ZSTD_storeSeq(seqStore, newLitLength, ip - newLitLength, iend,
- STORE_OFFSET(sequence.offset),
+ OFFSET_TO_OFFBASE(sequence.offset),
sequence.matchLength);
ip += sequence.matchLength;
}
/* ZSTD_getMatchPrice() :
* Provides the cost of the match part (offset + matchLength) of a sequence
* Must be combined with ZSTD_fullLiteralsCost() to get the full cost of a sequence.
- * @offcode : expects a scale where 0,1,2 are repcodes 1-3, and 3+ are real_offsets+2
+ * @offBase : sumtype, representing an offset or a repcode, and using numeric representation of ZSTD_storeSeq()
* @optLevel: when <2, favors small offset for decompression speed (improved cache efficiency)
*/
FORCE_INLINE_TEMPLATE U32
-ZSTD_getMatchPrice(U32 const offcode,
+ZSTD_getMatchPrice(U32 const offBase,
U32 const matchLength,
const optState_t* const optPtr,
int const optLevel)
{
U32 price;
- U32 const offCode = ZSTD_highbit32(STORED_TO_OFFBASE(offcode));
+ U32 const offCode = ZSTD_highbit32(offBase);
U32 const mlBase = matchLength - MINMATCH;
assert(matchLength >= MINMATCH);
}
/* ZSTD_updateStats() :
- * assumption : literals + litLengtn <= iend */
+ * assumption : literals + litLength <= iend */
static void ZSTD_updateStats(optState_t* const optPtr,
U32 litLength, const BYTE* literals,
- U32 offsetCode, U32 matchLength)
+ U32 offBase, U32 matchLength)
{
/* literals */
if (ZSTD_compressedLiterals(optPtr)) {
}
/* offset code : expected to follow storeSeq() numeric representation */
- { U32 const offCode = ZSTD_highbit32(STORED_TO_OFFBASE(offsetCode));
+ { U32 const offCode = ZSTD_highbit32(offBase);
assert(offCode <= MaxOff);
optPtr->offCodeFreq[offCode]++;
optPtr->offCodeSum++;
DEBUGLOG(8, "found repCode %u (ll0:%u, offset:%u) of length %u",
repCode, ll0, repOffset, repLen);
bestLength = repLen;
- matches[mnum].off = STORE_REPCODE(repCode - ll0 + 1); /* expect value between 1 and 3 */
+ matches[mnum].off = REPCODE_TO_OFFBASE(repCode - ll0 + 1); /* expect value between 1 and 3 */
matches[mnum].len = (U32)repLen;
mnum++;
if ( (repLen > sufficient_len)
bestLength = mlen;
assert(curr > matchIndex3);
assert(mnum==0); /* no prior solution */
- matches[0].off = STORE_OFFSET(curr - matchIndex3);
+ matches[0].off = OFFSET_TO_OFFBASE(curr - matchIndex3);
matches[0].len = (U32)mlen;
mnum = 1;
if ( (mlen > sufficient_len) |
}
if (matchLength > bestLength) {
- DEBUGLOG(8, "found match of length %u at distance %u (offCode=%u)",
- (U32)matchLength, curr - matchIndex, STORE_OFFSET(curr - matchIndex));
+ DEBUGLOG(8, "found match of length %u at distance %u (offBase=%u)",
+ (U32)matchLength, curr - matchIndex, OFFSET_TO_OFFBASE(curr - matchIndex));
assert(matchEndIdx > matchIndex);
if (matchLength > matchEndIdx - matchIndex)
matchEndIdx = matchIndex + (U32)matchLength;
bestLength = matchLength;
- matches[mnum].off = STORE_OFFSET(curr - matchIndex);
+ matches[mnum].off = OFFSET_TO_OFFBASE(curr - matchIndex);
matches[mnum].len = (U32)matchLength;
mnum++;
if ( (matchLength > ZSTD_OPT_NUM)
if (matchLength > bestLength) {
matchIndex = dictMatchIndex + dmsIndexDelta;
- DEBUGLOG(8, "found dms match of length %u at distance %u (offCode=%u)",
- (U32)matchLength, curr - matchIndex, STORE_OFFSET(curr - matchIndex));
+ DEBUGLOG(8, "found dms match of length %u at distance %u (offBase=%u)",
+ (U32)matchLength, curr - matchIndex, OFFSET_TO_OFFBASE(curr - matchIndex));
if (matchLength > matchEndIdx - matchIndex)
matchEndIdx = matchIndex + (U32)matchLength;
bestLength = matchLength;
- matches[mnum].off = STORE_OFFSET(curr - matchIndex);
+ matches[mnum].off = OFFSET_TO_OFFBASE(curr - matchIndex);
matches[mnum].len = (U32)matchLength;
mnum++;
if ( (matchLength > ZSTD_OPT_NUM)
const ZSTD_optLdm_t* optLdm, U32 currPosInBlock)
{
U32 const posDiff = currPosInBlock - optLdm->startPosInBlock;
- /* Note: ZSTD_match_t actually contains offCode and matchLength (before subtracting MINMATCH) */
+ /* Note: ZSTD_match_t actually contains offBase and matchLength (before subtracting MINMATCH) */
U32 const candidateMatchLength = optLdm->endPosInBlock - optLdm->startPosInBlock - posDiff;
/* Ensure that current block position is not outside of the match */
}
if (*nbMatches == 0 || ((candidateMatchLength > matches[*nbMatches-1].len) && *nbMatches < ZSTD_OPT_NUM)) {
- U32 const candidateOffCode = STORE_OFFSET(optLdm->offset);
- DEBUGLOG(6, "ZSTD_optLdm_maybeAddMatch(): Adding ldm candidate match (offCode: %u matchLength %u) at block position=%u",
- candidateOffCode, candidateMatchLength, currPosInBlock);
+ U32 const candidateOffBase = OFFSET_TO_OFFBASE(optLdm->offset);
+ DEBUGLOG(6, "ZSTD_optLdm_maybeAddMatch(): Adding ldm candidate match (offBase: %u matchLength %u) at block position=%u",
+ candidateOffBase, candidateMatchLength, currPosInBlock);
matches[*nbMatches].len = candidateMatchLength;
- matches[*nbMatches].off = candidateOffCode;
+ matches[*nbMatches].off = candidateOffBase;
(*nbMatches)++;
}
}
/* large match -> immediate encoding */
{ U32 const maxML = matches[nbMatches-1].len;
- U32 const maxOffcode = matches[nbMatches-1].off;
- DEBUGLOG(6, "found %u matches of maxLength=%u and maxOffCode=%u at cPos=%u => start new series",
- nbMatches, maxML, maxOffcode, (U32)(ip-prefixStart));
+ U32 const maxOffBase = matches[nbMatches-1].off;
+ DEBUGLOG(6, "found %u matches of maxLength=%u and maxOffBase=%u at cPos=%u => start new series",
+ nbMatches, maxML, maxOffBase, (U32)(ip-prefixStart));
if (maxML > sufficient_len) {
lastSequence.litlen = litlen;
lastSequence.mlen = maxML;
- lastSequence.off = maxOffcode;
+ lastSequence.off = maxOffBase;
DEBUGLOG(6, "large match (%u>%u), immediate encoding",
maxML, sufficient_len);
cur = 0;
opt[pos].price = ZSTD_MAX_PRICE; /* mlen, litlen and price will be fixed during forward scanning */
}
for (matchNb = 0; matchNb < nbMatches; matchNb++) {
- U32 const offcode = matches[matchNb].off;
+ U32 const offBase = matches[matchNb].off;
U32 const end = matches[matchNb].len;
for ( ; pos <= end ; pos++ ) {
- U32 const matchPrice = ZSTD_getMatchPrice(offcode, pos, optStatePtr, optLevel);
+ U32 const matchPrice = ZSTD_getMatchPrice(offBase, pos, optStatePtr, optLevel);
U32 const sequencePrice = literalsPrice + matchPrice;
DEBUGLOG(7, "rPos:%u => set initial price : %.2f",
pos, ZSTD_fCost(sequencePrice));
opt[pos].mlen = pos;
- opt[pos].off = offcode;
+ opt[pos].off = offBase;
opt[pos].litlen = litlen;
opt[pos].price = (int)sequencePrice;
} }
U32 const startML = (matchNb>0) ? matches[matchNb-1].len+1 : minMatch;
U32 mlen;
- DEBUGLOG(7, "testing match %u => offCode=%4u, mlen=%2u, llen=%2u",
+ DEBUGLOG(7, "testing match %u => offBase=%4u, mlen=%2u, llen=%2u",
matchNb, matches[matchNb].off, lastML, litlen);
for (mlen = lastML; mlen >= startML; mlen--) { /* scan downward */
for (storePos=storeStart; storePos <= storeEnd; storePos++) {
U32 const llen = opt[storePos].litlen;
U32 const mlen = opt[storePos].mlen;
- U32 const offCode = opt[storePos].off;
+ U32 const offBase = opt[storePos].off;
U32 const advance = llen + mlen;
DEBUGLOG(6, "considering seq starting at %zi, llen=%u, mlen=%u",
anchor - istart, (unsigned)llen, (unsigned)mlen);
}
assert(anchor + llen <= iend);
- ZSTD_updateStats(optStatePtr, llen, anchor, offCode, mlen);
- ZSTD_storeSeq(seqStore, llen, anchor, iend, offCode, mlen);
+ ZSTD_updateStats(optStatePtr, llen, anchor, offBase, mlen);
+ ZSTD_storeSeq(seqStore, llen, anchor, iend, offBase, mlen);
anchor += advance;
ip = anchor;
} }
: 0;
/* actual offset, code to send, and point to copy up to when shifting
* codes in the repeat offsets history */
- U32 offset, offsetCode, repIndex;
+ U32 offset, offBase, repIndex;
/* bounds checks */
matchLen = (U32) MIN(matchLen, excessMatch + MIN_SEQ_LEN);
}
}
}
- offsetCode = STORE_OFFSET(offset);
+ offBase = OFFSET_TO_OFFBASE(offset);
repIndex = 2;
} else {
/* do a repeat offset */
U32 const randomRepIndex = RAND(seed) % 3;
- offsetCode = STORE_REPCODE(randomRepIndex + 1); /* expects values between 1 & 3 */
+ offBase = REPCODE_TO_OFFBASE(randomRepIndex + 1); /* expects values between 1 & 3 */
if (literalLen > 0) {
offset = frame->stats.rep[randomRepIndex];
repIndex = randomRepIndex;
DISPLAYLEVEL(7, " srcPos: %8u seqNb: %3u",
(unsigned)((BYTE*)srcPtr - (BYTE*)frame->srcStart), (unsigned)i);
DISPLAYLEVEL(6, "\n");
- if (STORED_IS_REPCODE(offsetCode)) { /* expects sumtype numeric representation of ZSTD_storeSeq() */
+ if (OFFBASE_IS_REPCODE(offBase)) { /* expects sumtype numeric representation of ZSTD_storeSeq() */
DISPLAYLEVEL(7, " repeat offset: %d\n", (int)repIndex);
}
/* use libzstd sequence handling */
ZSTD_storeSeq(seqStore, literalLen, literals, literals + literalLen,
- offsetCode, matchLen);
+ offBase, matchLen);
literalsSize -= literalLen;
excessMatch -= (matchLen - MIN_SEQ_LEN);
memcpy(srcPtr, literals, literalsSize);
srcPtr += literalsSize;
- DISPLAYLEVEL(6, " excess literals: %5u", (unsigned)literalsSize);
- DISPLAYLEVEL(7, " srcPos: %8u", (unsigned)((BYTE*)srcPtr - (BYTE*)frame->srcStart));
+ DISPLAYLEVEL(6, " excess literals: %5u ", (unsigned)literalsSize);
+ DISPLAYLEVEL(7, "srcPos: %8u ", (unsigned)((BYTE*)srcPtr - (BYTE*)frame->srcStart));
DISPLAYLEVEL(6, "\n");
return numSequences;
{ U32 u;
for (u = 0; u < CNBuffSize; ++u) {
((BYTE*)CNBuffer)[u] = 255 - ((BYTE*)CNBuffer)[u];
- }
- }
+ } }
{ /* Compress the data */
size_t const inputSize = 500;
size_t const outputSize = ZSTD_compressBound(inputSize);
projects / thirdparty / zstd.git / commitdiff
