aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/lz4/lz4hc.c
diff options
context:
space:
mode:
authordanlark <danlark@yandex-team.ru>2022-02-10 16:46:08 +0300
committerDaniil Cherednik <dcherednik@yandex-team.ru>2022-02-10 16:46:08 +0300
commit3426a9bc7f169ae9da54cef557ad2a33f6e8eee0 (patch)
tree26154e1e9990f1bb4525d3e3fb5b6dac2c2c1da2 /contrib/libs/lz4/lz4hc.c
parentcb68f224c46a8ee52ac3fdd2a32534b8bb8dc134 (diff)
downloadydb-3426a9bc7f169ae9da54cef557ad2a33f6e8eee0.tar.gz
Restoring authorship annotation for <danlark@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/libs/lz4/lz4hc.c')
-rw-r--r--contrib/libs/lz4/lz4hc.c1860
1 files changed, 930 insertions, 930 deletions
diff --git a/contrib/libs/lz4/lz4hc.c b/contrib/libs/lz4/lz4hc.c
index a556d47920..6e5ea27f1d 100644
--- a/contrib/libs/lz4/lz4hc.c
+++ b/contrib/libs/lz4/lz4hc.c
@@ -1,6 +1,6 @@
/*
LZ4 HC - High Compression Mode of LZ4
- Copyright (C) 2011-2017, Yann Collet.
+ Copyright (C) 2011-2017, Yann Collet.
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
@@ -38,18 +38,18 @@
* Tuning Parameter
***************************************/
-/*! HEAPMODE :
- * Select how default compression function will allocate workplace memory,
- * in stack (0:fastest), or in heap (1:requires malloc()).
- * Since workplace is rather large, heap mode is recommended.
+/*! HEAPMODE :
+ * Select how default compression function will allocate workplace memory,
+ * in stack (0:fastest), or in heap (1:requires malloc()).
+ * Since workplace is rather large, heap mode is recommended.
*/
#ifndef LZ4HC_HEAPMODE
# define LZ4HC_HEAPMODE 1
#endif
-/*=== Dependency ===*/
-#define LZ4_HC_STATIC_LINKING_ONLY
+/*=== Dependency ===*/
+#define LZ4_HC_STATIC_LINKING_ONLY
#include "lz4hc.h"
@@ -62,28 +62,28 @@
#endif
#define LZ4_COMMONDEFS_ONLY
-#ifndef LZ4_SRC_INCLUDED
-#include "lz4.c" /* LZ4_count, constants, mem */
-#endif
+#ifndef LZ4_SRC_INCLUDED
+#include "lz4.c" /* LZ4_count, constants, mem */
+#endif
/*=== Enums ===*/
typedef enum { noDictCtx, usingDictCtxHc } dictCtx_directive;
-/*=== Constants ===*/
+/*=== Constants ===*/
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
-#define LZ4_OPT_NUM (1<<12)
+#define LZ4_OPT_NUM (1<<12)
-/*=== Macros ===*/
-#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
-#define MAX(a,b) ( (a) > (b) ? (a) : (b) )
-#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-LZ4HC_HASH_LOG))
-#define DELTANEXTMAXD(p) chainTable[(p) & LZ4HC_MAXD_MASK] /* flexible, LZ4HC_MAXD dependent */
-#define DELTANEXTU16(table, pos) table[(U16)(pos)] /* faster */
-/* Make fields passed to, and updated by LZ4HC_encodeSequence explicit */
-#define UPDATABLE(ip, op, anchor) &ip, &op, &anchor
+/*=== Macros ===*/
+#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
+#define MAX(a,b) ( (a) > (b) ? (a) : (b) )
+#define HASH_FUNCTION(i) (((i) * 2654435761U) >> ((MINMATCH*8)-LZ4HC_HASH_LOG))
+#define DELTANEXTMAXD(p) chainTable[(p) & LZ4HC_MAXD_MASK] /* flexible, LZ4HC_MAXD dependent */
+#define DELTANEXTU16(table, pos) table[(U16)(pos)] /* faster */
+/* Make fields passed to, and updated by LZ4HC_encodeSequence explicit */
+#define UPDATABLE(ip, op, anchor) &ip, &op, &anchor
static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)); }
@@ -91,31 +91,31 @@ static U32 LZ4HC_hashPtr(const void* ptr) { return HASH_FUNCTION(LZ4_read32(ptr)
/**************************************
* HC Compression
**************************************/
-static void LZ4HC_clearTables (LZ4HC_CCtx_internal* hc4)
+static void LZ4HC_clearTables (LZ4HC_CCtx_internal* hc4)
{
MEM_INIT(hc4->hashTable, 0, sizeof(hc4->hashTable));
MEM_INIT(hc4->chainTable, 0xFF, sizeof(hc4->chainTable));
-}
-
-static void LZ4HC_init_internal (LZ4HC_CCtx_internal* hc4, const BYTE* start)
-{
- uptrval startingOffset = (uptrval)(hc4->end - hc4->base);
- if (startingOffset > 1 GB) {
- LZ4HC_clearTables(hc4);
- startingOffset = 0;
- }
- startingOffset += 64 KB;
- hc4->nextToUpdate = (U32) startingOffset;
- hc4->base = start - startingOffset;
+}
+
+static void LZ4HC_init_internal (LZ4HC_CCtx_internal* hc4, const BYTE* start)
+{
+ uptrval startingOffset = (uptrval)(hc4->end - hc4->base);
+ if (startingOffset > 1 GB) {
+ LZ4HC_clearTables(hc4);
+ startingOffset = 0;
+ }
+ startingOffset += 64 KB;
+ hc4->nextToUpdate = (U32) startingOffset;
+ hc4->base = start - startingOffset;
hc4->end = start;
- hc4->dictBase = start - startingOffset;
- hc4->dictLimit = (U32) startingOffset;
- hc4->lowLimit = (U32) startingOffset;
+ hc4->dictBase = start - startingOffset;
+ hc4->dictLimit = (U32) startingOffset;
+ hc4->lowLimit = (U32) startingOffset;
}
/* Update chains up to ip (excluded) */
-LZ4_FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
+LZ4_FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
{
U16* const chainTable = hc4->chainTable;
U32* const hashTable = hc4->hashTable;
@@ -126,8 +126,8 @@ LZ4_FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
while (idx < target) {
U32 const h = LZ4HC_hashPtr(base+idx);
size_t delta = idx - hashTable[h];
- if (delta>LZ4_DISTANCE_MAX) delta = LZ4_DISTANCE_MAX;
- DELTANEXTU16(chainTable, idx) = (U16)delta;
+ if (delta>LZ4_DISTANCE_MAX) delta = LZ4_DISTANCE_MAX;
+ DELTANEXTU16(chainTable, idx) = (U16)delta;
hashTable[h] = idx;
idx++;
}
@@ -135,22 +135,22 @@ LZ4_FORCE_INLINE void LZ4HC_Insert (LZ4HC_CCtx_internal* hc4, const BYTE* ip)
hc4->nextToUpdate = target;
}
-/** LZ4HC_countBack() :
- * @return : negative value, nb of common bytes before ip/match */
-LZ4_FORCE_INLINE
-int LZ4HC_countBack(const BYTE* const ip, const BYTE* const match,
- const BYTE* const iMin, const BYTE* const mMin)
-{
- int back = 0;
- int const min = (int)MAX(iMin - ip, mMin - match);
- assert(min <= 0);
- assert(ip >= iMin); assert((size_t)(ip-iMin) < (1U<<31));
- assert(match >= mMin); assert((size_t)(match - mMin) < (1U<<31));
- while ( (back > min)
- && (ip[back-1] == match[back-1]) )
- back--;
- return back;
-}
+/** LZ4HC_countBack() :
+ * @return : negative value, nb of common bytes before ip/match */
+LZ4_FORCE_INLINE
+int LZ4HC_countBack(const BYTE* const ip, const BYTE* const match,
+ const BYTE* const iMin, const BYTE* const mMin)
+{
+ int back = 0;
+ int const min = (int)MAX(iMin - ip, mMin - match);
+ assert(min <= 0);
+ assert(ip >= iMin); assert((size_t)(ip-iMin) < (1U<<31));
+ assert(match >= mMin); assert((size_t)(match - mMin) < (1U<<31));
+ while ( (back > min)
+ && (ip[back-1] == match[back-1]) )
+ back--;
+ return back;
+}
#if defined(_MSC_VER)
# define LZ4HC_rotl32(x,r) _rotl(x,r)
@@ -166,59 +166,59 @@ static U32 LZ4HC_rotatePattern(size_t const rotate, U32 const pattern)
return LZ4HC_rotl32(pattern, (int)bitsToRotate);
}
-/* LZ4HC_countPattern() :
- * pattern32 must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!) */
-static unsigned
-LZ4HC_countPattern(const BYTE* ip, const BYTE* const iEnd, U32 const pattern32)
+/* LZ4HC_countPattern() :
+ * pattern32 must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!) */
+static unsigned
+LZ4HC_countPattern(const BYTE* ip, const BYTE* const iEnd, U32 const pattern32)
{
- const BYTE* const iStart = ip;
+ const BYTE* const iStart = ip;
reg_t const pattern = (sizeof(pattern)==8) ?
(reg_t)pattern32 + (((reg_t)pattern32) << (sizeof(pattern)*4)) : pattern32;
- while (likely(ip < iEnd-(sizeof(pattern)-1))) {
- reg_t const diff = LZ4_read_ARCH(ip) ^ pattern;
- if (!diff) { ip+=sizeof(pattern); continue; }
- ip += LZ4_NbCommonBytes(diff);
- return (unsigned)(ip - iStart);
- }
-
- if (LZ4_isLittleEndian()) {
- reg_t patternByte = pattern;
- while ((ip<iEnd) && (*ip == (BYTE)patternByte)) {
- ip++; patternByte >>= 8;
- }
- } else { /* big endian */
- U32 bitOffset = (sizeof(pattern)*8) - 8;
- while (ip < iEnd) {
- BYTE const byte = (BYTE)(pattern >> bitOffset);
- if (*ip != byte) break;
- ip ++; bitOffset -= 8;
+ while (likely(ip < iEnd-(sizeof(pattern)-1))) {
+ reg_t const diff = LZ4_read_ARCH(ip) ^ pattern;
+ if (!diff) { ip+=sizeof(pattern); continue; }
+ ip += LZ4_NbCommonBytes(diff);
+ return (unsigned)(ip - iStart);
+ }
+
+ if (LZ4_isLittleEndian()) {
+ reg_t patternByte = pattern;
+ while ((ip<iEnd) && (*ip == (BYTE)patternByte)) {
+ ip++; patternByte >>= 8;
}
+ } else { /* big endian */
+ U32 bitOffset = (sizeof(pattern)*8) - 8;
+ while (ip < iEnd) {
+ BYTE const byte = (BYTE)(pattern >> bitOffset);
+ if (*ip != byte) break;
+ ip ++; bitOffset -= 8;
+ }
}
- return (unsigned)(ip - iStart);
-}
-
-/* LZ4HC_reverseCountPattern() :
- * pattern must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!)
- * read using natural platform endianess */
-static unsigned
-LZ4HC_reverseCountPattern(const BYTE* ip, const BYTE* const iLow, U32 pattern)
-{
- const BYTE* const iStart = ip;
-
- while (likely(ip >= iLow+4)) {
- if (LZ4_read32(ip-4) != pattern) break;
- ip -= 4;
- }
- { const BYTE* bytePtr = (const BYTE*)(&pattern) + 3; /* works for any endianess */
- while (likely(ip>iLow)) {
- if (ip[-1] != *bytePtr) break;
- ip--; bytePtr--;
- } }
- return (unsigned)(iStart - ip);
+ return (unsigned)(ip - iStart);
}
+/* LZ4HC_reverseCountPattern() :
+ * pattern must be a sample of repetitive pattern of length 1, 2 or 4 (but not 3!)
+ * read using natural platform endianess */
+static unsigned
+LZ4HC_reverseCountPattern(const BYTE* ip, const BYTE* const iLow, U32 pattern)
+{
+ const BYTE* const iStart = ip;
+
+ while (likely(ip >= iLow+4)) {
+ if (LZ4_read32(ip-4) != pattern) break;
+ ip -= 4;
+ }
+ { const BYTE* bytePtr = (const BYTE*)(&pattern) + 3; /* works for any endianess */
+ while (likely(ip>iLow)) {
+ if (ip[-1] != *bytePtr) break;
+ ip--; bytePtr--;
+ } }
+ return (unsigned)(iStart - ip);
+}
+
/* LZ4HC_protectDictEnd() :
* Checks if the match is in the last 3 bytes of the dictionary, so reading the
* 4 byte MINMATCH would overflow.
@@ -229,11 +229,11 @@ static int LZ4HC_protectDictEnd(U32 const dictLimit, U32 const matchIndex)
return ((U32)((dictLimit - 1) - matchIndex) >= 3);
}
-typedef enum { rep_untested, rep_not, rep_confirmed } repeat_state_e;
-typedef enum { favorCompressionRatio=0, favorDecompressionSpeed } HCfavor_e;
-
-LZ4_FORCE_INLINE int
-LZ4HC_InsertAndGetWiderMatch (
+typedef enum { rep_untested, rep_not, rep_confirmed } repeat_state_e;
+typedef enum { favorCompressionRatio=0, favorDecompressionSpeed } HCfavor_e;
+
+LZ4_FORCE_INLINE int
+LZ4HC_InsertAndGetWiderMatch (
LZ4HC_CCtx_internal* hc4,
const BYTE* const ip,
const BYTE* const iLowLimit,
@@ -241,116 +241,116 @@ LZ4HC_InsertAndGetWiderMatch (
int longest,
const BYTE** matchpos,
const BYTE** startpos,
- const int maxNbAttempts,
- const int patternAnalysis,
- const int chainSwap,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
+ const int maxNbAttempts,
+ const int patternAnalysis,
+ const int chainSwap,
+ const dictCtx_directive dict,
+ const HCfavor_e favorDecSpeed)
{
U16* const chainTable = hc4->chainTable;
U32* const HashTable = hc4->hashTable;
- const LZ4HC_CCtx_internal * const dictCtx = hc4->dictCtx;
+ const LZ4HC_CCtx_internal * const dictCtx = hc4->dictCtx;
const BYTE* const base = hc4->base;
const U32 dictLimit = hc4->dictLimit;
const BYTE* const lowPrefixPtr = base + dictLimit;
- const U32 ipIndex = (U32)(ip - base);
+ const U32 ipIndex = (U32)(ip - base);
const U32 lowestMatchIndex = (hc4->lowLimit + (LZ4_DISTANCE_MAX + 1) > ipIndex) ? hc4->lowLimit : ipIndex - LZ4_DISTANCE_MAX;
const BYTE* const dictBase = hc4->dictBase;
- int const lookBackLength = (int)(ip-iLowLimit);
+ int const lookBackLength = (int)(ip-iLowLimit);
int nbAttempts = maxNbAttempts;
- U32 matchChainPos = 0;
- U32 const pattern = LZ4_read32(ip);
- U32 matchIndex;
- repeat_state_e repeat = rep_untested;
- size_t srcPatternLength = 0;
+ U32 matchChainPos = 0;
+ U32 const pattern = LZ4_read32(ip);
+ U32 matchIndex;
+ repeat_state_e repeat = rep_untested;
+ size_t srcPatternLength = 0;
- DEBUGLOG(7, "LZ4HC_InsertAndGetWiderMatch");
+ DEBUGLOG(7, "LZ4HC_InsertAndGetWiderMatch");
/* First Match */
LZ4HC_Insert(hc4, ip);
matchIndex = HashTable[LZ4HC_hashPtr(ip)];
- DEBUGLOG(7, "First match at index %u / %u (lowestMatchIndex)",
- matchIndex, lowestMatchIndex);
+ DEBUGLOG(7, "First match at index %u / %u (lowestMatchIndex)",
+ matchIndex, lowestMatchIndex);
while ((matchIndex>=lowestMatchIndex) && (nbAttempts>0)) {
- int matchLength=0;
+ int matchLength=0;
nbAttempts--;
- assert(matchIndex < ipIndex);
- if (favorDecSpeed && (ipIndex - matchIndex < 8)) {
- /* do nothing */
- } else if (matchIndex >= dictLimit) { /* within current Prefix */
- const BYTE* const matchPtr = base + matchIndex;
- assert(matchPtr >= lowPrefixPtr);
- assert(matchPtr < ip);
- assert(longest >= 1);
- if (LZ4_read16(iLowLimit + longest - 1) == LZ4_read16(matchPtr - lookBackLength + longest - 1)) {
- if (LZ4_read32(matchPtr) == pattern) {
- int const back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, lowPrefixPtr) : 0;
- matchLength = MINMATCH + (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
- matchLength -= back;
- if (matchLength > longest) {
- longest = matchLength;
- *matchpos = matchPtr + back;
- *startpos = ip + back;
- } } }
- } else { /* lowestMatchIndex <= matchIndex < dictLimit */
- const BYTE* const matchPtr = dictBase + matchIndex;
- if (LZ4_read32(matchPtr) == pattern) {
- const BYTE* const dictStart = dictBase + hc4->lowLimit;
- int back = 0;
- const BYTE* vLimit = ip + (dictLimit - matchIndex);
- if (vLimit > iHighLimit) vLimit = iHighLimit;
- matchLength = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
- if ((ip+matchLength == vLimit) && (vLimit < iHighLimit))
- matchLength += LZ4_count(ip+matchLength, lowPrefixPtr, iHighLimit);
- back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictStart) : 0;
- matchLength -= back;
- if (matchLength > longest) {
- longest = matchLength;
- *matchpos = base + matchIndex + back; /* virtual pos, relative to ip, to retrieve offset */
- *startpos = ip + back;
- } } }
-
- if (chainSwap && matchLength==longest) { /* better match => select a better chain */
- assert(lookBackLength==0); /* search forward only */
- if (matchIndex + (U32)longest <= ipIndex) {
+ assert(matchIndex < ipIndex);
+ if (favorDecSpeed && (ipIndex - matchIndex < 8)) {
+ /* do nothing */
+ } else if (matchIndex >= dictLimit) { /* within current Prefix */
+ const BYTE* const matchPtr = base + matchIndex;
+ assert(matchPtr >= lowPrefixPtr);
+ assert(matchPtr < ip);
+ assert(longest >= 1);
+ if (LZ4_read16(iLowLimit + longest - 1) == LZ4_read16(matchPtr - lookBackLength + longest - 1)) {
+ if (LZ4_read32(matchPtr) == pattern) {
+ int const back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, lowPrefixPtr) : 0;
+ matchLength = MINMATCH + (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, iHighLimit);
+ matchLength -= back;
+ if (matchLength > longest) {
+ longest = matchLength;
+ *matchpos = matchPtr + back;
+ *startpos = ip + back;
+ } } }
+ } else { /* lowestMatchIndex <= matchIndex < dictLimit */
+ const BYTE* const matchPtr = dictBase + matchIndex;
+ if (LZ4_read32(matchPtr) == pattern) {
+ const BYTE* const dictStart = dictBase + hc4->lowLimit;
+ int back = 0;
+ const BYTE* vLimit = ip + (dictLimit - matchIndex);
+ if (vLimit > iHighLimit) vLimit = iHighLimit;
+ matchLength = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
+ if ((ip+matchLength == vLimit) && (vLimit < iHighLimit))
+ matchLength += LZ4_count(ip+matchLength, lowPrefixPtr, iHighLimit);
+ back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictStart) : 0;
+ matchLength -= back;
+ if (matchLength > longest) {
+ longest = matchLength;
+ *matchpos = base + matchIndex + back; /* virtual pos, relative to ip, to retrieve offset */
+ *startpos = ip + back;
+ } } }
+
+ if (chainSwap && matchLength==longest) { /* better match => select a better chain */
+ assert(lookBackLength==0); /* search forward only */
+ if (matchIndex + (U32)longest <= ipIndex) {
int const kTrigger = 4;
- U32 distanceToNextMatch = 1;
+ U32 distanceToNextMatch = 1;
int const end = longest - MINMATCH + 1;
int step = 1;
int accel = 1 << kTrigger;
- int pos;
+ int pos;
for (pos = 0; pos < end; pos += step) {
- U32 const candidateDist = DELTANEXTU16(chainTable, matchIndex + (U32)pos);
+ U32 const candidateDist = DELTANEXTU16(chainTable, matchIndex + (U32)pos);
step = (accel++ >> kTrigger);
- if (candidateDist > distanceToNextMatch) {
- distanceToNextMatch = candidateDist;
- matchChainPos = (U32)pos;
+ if (candidateDist > distanceToNextMatch) {
+ distanceToNextMatch = candidateDist;
+ matchChainPos = (U32)pos;
accel = 1 << kTrigger;
}
}
- if (distanceToNextMatch > 1) {
- if (distanceToNextMatch > matchIndex) break; /* avoid overflow */
- matchIndex -= distanceToNextMatch;
- continue;
- } } }
-
- { U32 const distNextMatch = DELTANEXTU16(chainTable, matchIndex);
- if (patternAnalysis && distNextMatch==1 && matchChainPos==0) {
- U32 const matchCandidateIdx = matchIndex-1;
- /* may be a repeated pattern */
- if (repeat == rep_untested) {
- if ( ((pattern & 0xFFFF) == (pattern >> 16))
- & ((pattern & 0xFF) == (pattern >> 24)) ) {
- repeat = rep_confirmed;
- srcPatternLength = LZ4HC_countPattern(ip+sizeof(pattern), iHighLimit, pattern) + sizeof(pattern);
- } else {
- repeat = rep_not;
- } }
+ if (distanceToNextMatch > 1) {
+ if (distanceToNextMatch > matchIndex) break; /* avoid overflow */
+ matchIndex -= distanceToNextMatch;
+ continue;
+ } } }
+
+ { U32 const distNextMatch = DELTANEXTU16(chainTable, matchIndex);
+ if (patternAnalysis && distNextMatch==1 && matchChainPos==0) {
+ U32 const matchCandidateIdx = matchIndex-1;
+ /* may be a repeated pattern */
+ if (repeat == rep_untested) {
+ if ( ((pattern & 0xFFFF) == (pattern >> 16))
+ & ((pattern & 0xFF) == (pattern >> 24)) ) {
+ repeat = rep_confirmed;
+ srcPatternLength = LZ4HC_countPattern(ip+sizeof(pattern), iHighLimit, pattern) + sizeof(pattern);
+ } else {
+ repeat = rep_not;
+ } }
if ( (repeat == rep_confirmed) && (matchCandidateIdx >= lowestMatchIndex)
&& LZ4HC_protectDictEnd(dictLimit, matchCandidateIdx) ) {
const int extDict = matchCandidateIdx < dictLimit;
const BYTE* const matchPtr = (extDict ? dictBase : base) + matchCandidateIdx;
- if (LZ4_read32(matchPtr) == pattern) { /* good candidate */
+ if (LZ4_read32(matchPtr) == pattern) { /* good candidate */
const BYTE* const dictStart = dictBase + hc4->lowLimit;
const BYTE* const iLimit = extDict ? dictBase + dictLimit : iHighLimit;
size_t forwardPatternLength = LZ4HC_countPattern(matchPtr+sizeof(pattern), iLimit, pattern) + sizeof(pattern);
@@ -379,7 +379,7 @@ LZ4HC_InsertAndGetWiderMatch (
/* Can only happen if started in the prefix */
assert(newMatchIndex >= dictLimit - 3 && newMatchIndex < dictLimit && !extDict);
matchIndex = dictLimit;
- }
+ }
} else {
U32 const newMatchIndex = matchCandidateIdx - (U32)backLength; /* farthest position in current segment, will find a match of length currentSegmentLength + maybe some back */
if (!LZ4HC_protectDictEnd(dictLimit, newMatchIndex)) {
@@ -401,96 +401,96 @@ LZ4HC_InsertAndGetWiderMatch (
if (distToNextPattern > matchIndex) break; /* avoid overflow */
matchIndex -= distToNextPattern;
} } } } }
- continue;
- } }
- } } /* PA optimization */
-
- /* follow current chain */
- matchIndex -= DELTANEXTU16(chainTable, matchIndex + matchChainPos);
-
- } /* while ((matchIndex>=lowestMatchIndex) && (nbAttempts)) */
-
- if ( dict == usingDictCtxHc
+ continue;
+ } }
+ } } /* PA optimization */
+
+ /* follow current chain */
+ matchIndex -= DELTANEXTU16(chainTable, matchIndex + matchChainPos);
+
+ } /* while ((matchIndex>=lowestMatchIndex) && (nbAttempts)) */
+
+ if ( dict == usingDictCtxHc
&& nbAttempts > 0
- && ipIndex - lowestMatchIndex < LZ4_DISTANCE_MAX) {
- size_t const dictEndOffset = (size_t)(dictCtx->end - dictCtx->base);
- U32 dictMatchIndex = dictCtx->hashTable[LZ4HC_hashPtr(ip)];
- assert(dictEndOffset <= 1 GB);
- matchIndex = dictMatchIndex + lowestMatchIndex - (U32)dictEndOffset;
- while (ipIndex - matchIndex <= LZ4_DISTANCE_MAX && nbAttempts--) {
- const BYTE* const matchPtr = dictCtx->base + dictMatchIndex;
-
- if (LZ4_read32(matchPtr) == pattern) {
- int mlt;
- int back = 0;
- const BYTE* vLimit = ip + (dictEndOffset - dictMatchIndex);
+ && ipIndex - lowestMatchIndex < LZ4_DISTANCE_MAX) {
+ size_t const dictEndOffset = (size_t)(dictCtx->end - dictCtx->base);
+ U32 dictMatchIndex = dictCtx->hashTable[LZ4HC_hashPtr(ip)];
+ assert(dictEndOffset <= 1 GB);
+ matchIndex = dictMatchIndex + lowestMatchIndex - (U32)dictEndOffset;
+ while (ipIndex - matchIndex <= LZ4_DISTANCE_MAX && nbAttempts--) {
+ const BYTE* const matchPtr = dictCtx->base + dictMatchIndex;
+
+ if (LZ4_read32(matchPtr) == pattern) {
+ int mlt;
+ int back = 0;
+ const BYTE* vLimit = ip + (dictEndOffset - dictMatchIndex);
if (vLimit > iHighLimit) vLimit = iHighLimit;
- mlt = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
- back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictCtx->base + dictCtx->dictLimit) : 0;
+ mlt = (int)LZ4_count(ip+MINMATCH, matchPtr+MINMATCH, vLimit) + MINMATCH;
+ back = lookBackLength ? LZ4HC_countBack(ip, matchPtr, iLowLimit, dictCtx->base + dictCtx->dictLimit) : 0;
mlt -= back;
- if (mlt > longest) {
- longest = mlt;
- *matchpos = base + matchIndex + back;
- *startpos = ip + back;
- } }
-
- { U32 const nextOffset = DELTANEXTU16(dictCtx->chainTable, dictMatchIndex);
- dictMatchIndex -= nextOffset;
- matchIndex -= nextOffset;
- } } }
-
+ if (mlt > longest) {
+ longest = mlt;
+ *matchpos = base + matchIndex + back;
+ *startpos = ip + back;
+ } }
+
+ { U32 const nextOffset = DELTANEXTU16(dictCtx->chainTable, dictMatchIndex);
+ dictMatchIndex -= nextOffset;
+ matchIndex -= nextOffset;
+ } } }
+
return longest;
}
-LZ4_FORCE_INLINE
-int LZ4HC_InsertAndFindBestMatch(LZ4HC_CCtx_internal* const hc4, /* Index table will be updated */
- const BYTE* const ip, const BYTE* const iLimit,
- const BYTE** matchpos,
- const int maxNbAttempts,
- const int patternAnalysis,
- const dictCtx_directive dict)
-{
- const BYTE* uselessPtr = ip;
- /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
- * but this won't be the case here, as we define iLowLimit==ip,
- * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
- return LZ4HC_InsertAndGetWiderMatch(hc4, ip, ip, iLimit, MINMATCH-1, matchpos, &uselessPtr, maxNbAttempts, patternAnalysis, 0 /*chainSwap*/, dict, favorCompressionRatio);
-}
-
-/* LZ4HC_encodeSequence() :
- * @return : 0 if ok,
- * 1 if buffer issue detected */
-LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
+LZ4_FORCE_INLINE
+int LZ4HC_InsertAndFindBestMatch(LZ4HC_CCtx_internal* const hc4, /* Index table will be updated */
+ const BYTE* const ip, const BYTE* const iLimit,
+ const BYTE** matchpos,
+ const int maxNbAttempts,
+ const int patternAnalysis,
+ const dictCtx_directive dict)
+{
+ const BYTE* uselessPtr = ip;
+ /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
+ * but this won't be the case here, as we define iLowLimit==ip,
+ * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
+ return LZ4HC_InsertAndGetWiderMatch(hc4, ip, ip, iLimit, MINMATCH-1, matchpos, &uselessPtr, maxNbAttempts, patternAnalysis, 0 /*chainSwap*/, dict, favorCompressionRatio);
+}
+
+/* LZ4HC_encodeSequence() :
+ * @return : 0 if ok,
+ * 1 if buffer issue detected */
+LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
const BYTE** _ip,
BYTE** _op,
const BYTE** _anchor,
int matchLength,
const BYTE* const match,
- limitedOutput_directive limit,
+ limitedOutput_directive limit,
BYTE* oend)
{
#define ip (*_ip)
#define op (*_op)
#define anchor (*_anchor)
- size_t length;
+ size_t length;
BYTE* const token = op++;
-#if defined(LZ4_DEBUG) && (LZ4_DEBUG >= 6)
- static const BYTE* start = NULL;
- static U32 totalCost = 0;
+#if defined(LZ4_DEBUG) && (LZ4_DEBUG >= 6)
+ static const BYTE* start = NULL;
+ static U32 totalCost = 0;
U32 const pos = (start==NULL) ? 0 : (U32)(anchor - start);
U32 const ll = (U32)(ip - anchor);
- U32 const llAdd = (ll>=15) ? ((ll-15) / 255) + 1 : 0;
- U32 const mlAdd = (matchLength>=19) ? ((matchLength-19) / 255) + 1 : 0;
- U32 const cost = 1 + llAdd + ll + 2 + mlAdd;
+ U32 const llAdd = (ll>=15) ? ((ll-15) / 255) + 1 : 0;
+ U32 const mlAdd = (matchLength>=19) ? ((matchLength-19) / 255) + 1 : 0;
+ U32 const cost = 1 + llAdd + ll + 2 + mlAdd;
if (start==NULL) start = anchor; /* only works for single segment */
- /* g_debuglog_enable = (pos >= 2228) & (pos <= 2262); */
+ /* g_debuglog_enable = (pos >= 2228) & (pos <= 2262); */
DEBUGLOG(6, "pos:%7u -- literals:%4u, match:%4i, offset:%5u, cost:%4u + %5u",
- pos,
+ pos,
(U32)(ip - anchor), matchLength, (U32)(ip-match),
- cost, totalCost);
- totalCost += cost;
+ cost, totalCost);
+ totalCost += cost;
#endif
/* Encode Literal length */
@@ -502,14 +502,14 @@ LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
(int)length, (int)(oend - op));
return 1;
}
- if (length >= RUN_MASK) {
- size_t len = length - RUN_MASK;
- *token = (RUN_MASK << ML_BITS);
+ if (length >= RUN_MASK) {
+ size_t len = length - RUN_MASK;
+ *token = (RUN_MASK << ML_BITS);
for(; len >= 255 ; len -= 255) *op++ = 255;
*op++ = (BYTE)len;
- } else {
- *token = (BYTE)(length << ML_BITS);
- }
+ } else {
+ *token = (BYTE)(length << ML_BITS);
+ }
/* Copy Literals */
LZ4_wildCopy8(op, anchor, op + length);
@@ -520,13 +520,13 @@ LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
LZ4_writeLE16(op, (U16)(ip - match)); op += 2;
/* Encode MatchLength */
- assert(matchLength >= MINMATCH);
- length = (size_t)matchLength - MINMATCH;
+ assert(matchLength >= MINMATCH);
+ length = (size_t)matchLength - MINMATCH;
if (limit && (op + (length / 255) + (1 + LASTLITERALS) > oend)) {
DEBUGLOG(6, "Not enough room to write match length");
return 1; /* Check output limit */
}
- if (length >= ML_MASK) {
+ if (length >= ML_MASK) {
*token += ML_MASK;
length -= ML_MASK;
for(; length >= 510 ; length -= 510) { *op++ = 255; *op++ = 255; }
@@ -546,33 +546,33 @@ LZ4_FORCE_INLINE int LZ4HC_encodeSequence (
#undef op
#undef anchor
-LZ4_FORCE_INLINE int LZ4HC_compress_hashChain (
+LZ4_FORCE_INLINE int LZ4HC_compress_hashChain (
LZ4HC_CCtx_internal* const ctx,
const char* const source,
char* const dest,
- int* srcSizePtr,
+ int* srcSizePtr,
int const maxOutputSize,
int maxNbAttempts,
- const limitedOutput_directive limit,
- const dictCtx_directive dict
+ const limitedOutput_directive limit,
+ const dictCtx_directive dict
)
{
- const int inputSize = *srcSizePtr;
- const int patternAnalysis = (maxNbAttempts > 128); /* levels 9+ */
-
+ const int inputSize = *srcSizePtr;
+ const int patternAnalysis = (maxNbAttempts > 128); /* levels 9+ */
+
const BYTE* ip = (const BYTE*) source;
const BYTE* anchor = ip;
const BYTE* const iend = ip + inputSize;
const BYTE* const mflimit = iend - MFLIMIT;
const BYTE* const matchlimit = (iend - LASTLITERALS);
- BYTE* optr = (BYTE*) dest;
+ BYTE* optr = (BYTE*) dest;
BYTE* op = (BYTE*) dest;
- BYTE* oend = op + maxOutputSize;
+ BYTE* oend = op + maxOutputSize;
- int ml0, ml, ml2, ml3;
- const BYTE* start0;
- const BYTE* ref0;
+ int ml0, ml, ml2, ml3;
+ const BYTE* start0;
+ const BYTE* ref0;
const BYTE* ref = NULL;
const BYTE* start2 = NULL;
const BYTE* ref2 = NULL;
@@ -580,37 +580,37 @@ LZ4_FORCE_INLINE int LZ4HC_compress_hashChain (
const BYTE* ref3 = NULL;
/* init */
- *srcSizePtr = 0;
- if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
+ *srcSizePtr = 0;
+ if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
if (inputSize < LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
/* Main Loop */
- while (ip <= mflimit) {
- ml = LZ4HC_InsertAndFindBestMatch(ctx, ip, matchlimit, &ref, maxNbAttempts, patternAnalysis, dict);
- if (ml<MINMATCH) { ip++; continue; }
+ while (ip <= mflimit) {
+ ml = LZ4HC_InsertAndFindBestMatch(ctx, ip, matchlimit, &ref, maxNbAttempts, patternAnalysis, dict);
+ if (ml<MINMATCH) { ip++; continue; }
/* saved, in case we would skip too much */
- start0 = ip; ref0 = ref; ml0 = ml;
+ start0 = ip; ref0 = ref; ml0 = ml;
_Search2:
- if (ip+ml <= mflimit) {
- ml2 = LZ4HC_InsertAndGetWiderMatch(ctx,
- ip + ml - 2, ip + 0, matchlimit, ml, &ref2, &start2,
- maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
- } else {
- ml2 = ml;
- }
-
- if (ml2 == ml) { /* No better match => encode ML1 */
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
+ if (ip+ml <= mflimit) {
+ ml2 = LZ4HC_InsertAndGetWiderMatch(ctx,
+ ip + ml - 2, ip + 0, matchlimit, ml, &ref2, &start2,
+ maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
+ } else {
+ ml2 = ml;
+ }
+
+ if (ml2 == ml) { /* No better match => encode ML1 */
+ optr = op;
+ if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
continue;
}
- if (start0 < ip) { /* first match was skipped at least once */
- if (start2 < ip + ml0) { /* squeezing ML1 between ML0(original ML1) and ML2 */
- ip = start0; ref = ref0; ml = ml0; /* restore initial ML1 */
- } }
+ if (start0 < ip) { /* first match was skipped at least once */
+ if (start2 < ip + ml0) { /* squeezing ML1 between ML0(original ML1) and ML2 */
+ ip = start0; ref = ref0; ml = ml0; /* restore initial ML1 */
+ } }
/* Here, start0==ip */
if ((start2 - ip) < 3) { /* First Match too small : removed */
@@ -621,9 +621,9 @@ _Search2:
}
_Search3:
- /* At this stage, we have :
- * ml2 > ml1, and
- * ip1+3 <= ip2 (usually < ip1+ml1) */
+ /* At this stage, we have :
+ * ml2 > ml1, and
+ * ip1+3 <= ip2 (usually < ip1+ml1) */
if ((start2 - ip) < OPTIMAL_ML) {
int correction;
int new_ml = ml;
@@ -638,22 +638,22 @@ _Search3:
}
/* Now, we have start2 = ip+new_ml, with new_ml = min(ml, OPTIMAL_ML=18) */
- if (start2 + ml2 <= mflimit) {
- ml3 = LZ4HC_InsertAndGetWiderMatch(ctx,
- start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3,
- maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
- } else {
- ml3 = ml2;
- }
+ if (start2 + ml2 <= mflimit) {
+ ml3 = LZ4HC_InsertAndGetWiderMatch(ctx,
+ start2 + ml2 - 3, start2, matchlimit, ml2, &ref3, &start3,
+ maxNbAttempts, patternAnalysis, 0, dict, favorCompressionRatio);
+ } else {
+ ml3 = ml2;
+ }
- if (ml3 == ml2) { /* No better match => encode ML1 and ML2 */
+ if (ml3 == ml2) { /* No better match => encode ML1 and ML2 */
/* ip & ref are known; Now for ml */
if (start2 < ip+ml) ml = (int)(start2 - ip);
/* Now, encode 2 sequences */
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
+ optr = op;
+ if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
ip = start2;
- optr = op;
+ optr = op;
if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml2, ref2, limit, oend)) {
ml = ml2;
ref = ref2;
@@ -676,8 +676,8 @@ _Search3:
}
}
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
+ optr = op;
+ if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
ip = start3;
ref = ref3;
ml = ml3;
@@ -695,12 +695,12 @@ _Search3:
}
/*
- * OK, now we have 3 ascending matches;
- * let's write the first one ML1.
- * ip & ref are known; Now decide ml.
+ * OK, now we have 3 ascending matches;
+ * let's write the first one ML1.
+ * ip & ref are known; Now decide ml.
*/
if (start2 < ip+ml) {
- if ((start2 - ip) < OPTIMAL_ML) {
+ if ((start2 - ip) < OPTIMAL_ML) {
int correction;
if (ml > OPTIMAL_ML) ml = OPTIMAL_ML;
if (ip + ml > start2 + ml2 - MINMATCH) ml = (int)(start2 - ip) + ml2 - MINMATCH;
@@ -714,60 +714,60 @@ _Search3:
ml = (int)(start2 - ip);
}
}
- optr = op;
- if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
+ optr = op;
+ if (LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, limit, oend)) goto _dest_overflow;
- /* ML2 becomes ML1 */
- ip = start2; ref = ref2; ml = ml2;
+ /* ML2 becomes ML1 */
+ ip = start2; ref = ref2; ml = ml2;
- /* ML3 becomes ML2 */
- start2 = start3; ref2 = ref3; ml2 = ml3;
+ /* ML3 becomes ML2 */
+ start2 = start3; ref2 = ref3; ml2 = ml3;
- /* let's find a new ML3 */
+ /* let's find a new ML3 */
goto _Search3;
}
-_last_literals:
+_last_literals:
/* Encode Last Literals */
- { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
+ { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
size_t llAdd = (lastRunSize + 255 - RUN_MASK) / 255;
size_t const totalSize = 1 + llAdd + lastRunSize;
- if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
- if (limit && (op + totalSize > oend)) {
+ if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
+ if (limit && (op + totalSize > oend)) {
if (limit == limitedOutput) return 0;
- /* adapt lastRunSize to fill 'dest' */
+ /* adapt lastRunSize to fill 'dest' */
lastRunSize = (size_t)(oend - op) - 1 /*token*/;
llAdd = (lastRunSize + 256 - RUN_MASK) / 256;
lastRunSize -= llAdd;
- }
+ }
DEBUGLOG(6, "Final literal run : %i literals", (int)lastRunSize);
ip = anchor + lastRunSize; /* can be != iend if limit==fillOutput */
-
- if (lastRunSize >= RUN_MASK) {
- size_t accumulator = lastRunSize - RUN_MASK;
- *op++ = (RUN_MASK << ML_BITS);
- for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
- *op++ = (BYTE) accumulator;
- } else {
- *op++ = (BYTE)(lastRunSize << ML_BITS);
- }
- memcpy(op, anchor, lastRunSize);
- op += lastRunSize;
+
+ if (lastRunSize >= RUN_MASK) {
+ size_t accumulator = lastRunSize - RUN_MASK;
+ *op++ = (RUN_MASK << ML_BITS);
+ for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
+ *op++ = (BYTE) accumulator;
+ } else {
+ *op++ = (BYTE)(lastRunSize << ML_BITS);
+ }
+ memcpy(op, anchor, lastRunSize);
+ op += lastRunSize;
}
/* End */
- *srcSizePtr = (int) (((const char*)ip) - source);
+ *srcSizePtr = (int) (((const char*)ip) - source);
return (int) (((char*)op)-dest);
-_dest_overflow:
- if (limit == fillOutput) {
+_dest_overflow:
+ if (limit == fillOutput) {
/* Assumption : ip, anchor, ml and ref must be set correctly */
size_t const ll = (size_t)(ip - anchor);
size_t const ll_addbytes = (ll + 240) / 255;
size_t const ll_totalCost = 1 + ll_addbytes + ll;
BYTE* const maxLitPos = oend - 3; /* 2 for offset, 1 for token */
DEBUGLOG(6, "Last sequence overflowing");
- op = optr; /* restore correct out pointer */
+ op = optr; /* restore correct out pointer */
if (op + ll_totalCost <= maxLitPos) {
/* ll validated; now adjust match length */
size_t const bytesLeftForMl = (size_t)(maxLitPos - (op+ll_totalCost));
@@ -777,318 +777,318 @@ _dest_overflow:
if ((oend + LASTLITERALS) - (op + ll_totalCost + 2) - 1 + ml >= MFLIMIT) {
LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ref, notLimited, oend);
} }
- goto _last_literals;
+ goto _last_literals;
}
/* compression failed */
- return 0;
+ return 0;
}
-
-static int LZ4HC_compress_optimal( LZ4HC_CCtx_internal* ctx,
- const char* const source, char* dst,
- int* srcSizePtr, int dstCapacity,
- int const nbSearches, size_t sufficient_len,
- const limitedOutput_directive limit, int const fullUpdate,
- const dictCtx_directive dict,
+
+static int LZ4HC_compress_optimal( LZ4HC_CCtx_internal* ctx,
+ const char* const source, char* dst,
+ int* srcSizePtr, int dstCapacity,
+ int const nbSearches, size_t sufficient_len,
+ const limitedOutput_directive limit, int const fullUpdate,
+ const dictCtx_directive dict,
const HCfavor_e favorDecSpeed);
-
-
-LZ4_FORCE_INLINE int LZ4HC_compress_generic_internal (
+
+
+LZ4_FORCE_INLINE int LZ4HC_compress_generic_internal (
LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- const limitedOutput_directive limit,
- const dictCtx_directive dict
+ const char* const src,
+ char* const dst,
+ int* const srcSizePtr,
+ int const dstCapacity,
+ int cLevel,
+ const limitedOutput_directive limit,
+ const dictCtx_directive dict
)
{
- typedef enum { lz4hc, lz4opt } lz4hc_strat_e;
- typedef struct {
- lz4hc_strat_e strat;
+ typedef enum { lz4hc, lz4opt } lz4hc_strat_e;
+ typedef struct {
+ lz4hc_strat_e strat;
int nbSearches;
- U32 targetLength;
- } cParams_t;
- static const cParams_t clTable[LZ4HC_CLEVEL_MAX+1] = {
- { lz4hc, 2, 16 }, /* 0, unused */
- { lz4hc, 2, 16 }, /* 1, unused */
- { lz4hc, 2, 16 }, /* 2, unused */
- { lz4hc, 4, 16 }, /* 3 */
- { lz4hc, 8, 16 }, /* 4 */
- { lz4hc, 16, 16 }, /* 5 */
- { lz4hc, 32, 16 }, /* 6 */
- { lz4hc, 64, 16 }, /* 7 */
- { lz4hc, 128, 16 }, /* 8 */
- { lz4hc, 256, 16 }, /* 9 */
- { lz4opt, 96, 64 }, /*10==LZ4HC_CLEVEL_OPT_MIN*/
- { lz4opt, 512,128 }, /*11 */
- { lz4opt,16384,LZ4_OPT_NUM }, /* 12==LZ4HC_CLEVEL_MAX */
- };
-
+ U32 targetLength;
+ } cParams_t;
+ static const cParams_t clTable[LZ4HC_CLEVEL_MAX+1] = {
+ { lz4hc, 2, 16 }, /* 0, unused */
+ { lz4hc, 2, 16 }, /* 1, unused */
+ { lz4hc, 2, 16 }, /* 2, unused */
+ { lz4hc, 4, 16 }, /* 3 */
+ { lz4hc, 8, 16 }, /* 4 */
+ { lz4hc, 16, 16 }, /* 5 */
+ { lz4hc, 32, 16 }, /* 6 */
+ { lz4hc, 64, 16 }, /* 7 */
+ { lz4hc, 128, 16 }, /* 8 */
+ { lz4hc, 256, 16 }, /* 9 */
+ { lz4opt, 96, 64 }, /*10==LZ4HC_CLEVEL_OPT_MIN*/
+ { lz4opt, 512,128 }, /*11 */
+ { lz4opt,16384,LZ4_OPT_NUM }, /* 12==LZ4HC_CLEVEL_MAX */
+ };
+
DEBUGLOG(4, "LZ4HC_compress_generic(ctx=%p, src=%p, srcSize=%d, limit=%d)",
ctx, src, *srcSizePtr, limit);
-
- if (limit == fillOutput && dstCapacity < 1) return 0; /* Impossible to store anything */
- if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size (too large or negative) */
-
- ctx->end += *srcSizePtr;
- if (cLevel < 1) cLevel = LZ4HC_CLEVEL_DEFAULT; /* note : convention is different from lz4frame, maybe something to review */
- cLevel = MIN(LZ4HC_CLEVEL_MAX, cLevel);
- { cParams_t const cParam = clTable[cLevel];
- HCfavor_e const favor = ctx->favorDecSpeed ? favorDecompressionSpeed : favorCompressionRatio;
- int result;
-
- if (cParam.strat == lz4hc) {
- result = LZ4HC_compress_hashChain(ctx,
- src, dst, srcSizePtr, dstCapacity,
- cParam.nbSearches, limit, dict);
- } else {
- assert(cParam.strat == lz4opt);
- result = LZ4HC_compress_optimal(ctx,
- src, dst, srcSizePtr, dstCapacity,
+
+ if (limit == fillOutput && dstCapacity < 1) return 0; /* Impossible to store anything */
+ if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size (too large or negative) */
+
+ ctx->end += *srcSizePtr;
+ if (cLevel < 1) cLevel = LZ4HC_CLEVEL_DEFAULT; /* note : convention is different from lz4frame, maybe something to review */
+ cLevel = MIN(LZ4HC_CLEVEL_MAX, cLevel);
+ { cParams_t const cParam = clTable[cLevel];
+ HCfavor_e const favor = ctx->favorDecSpeed ? favorDecompressionSpeed : favorCompressionRatio;
+ int result;
+
+ if (cParam.strat == lz4hc) {
+ result = LZ4HC_compress_hashChain(ctx,
+ src, dst, srcSizePtr, dstCapacity,
+ cParam.nbSearches, limit, dict);
+ } else {
+ assert(cParam.strat == lz4opt);
+ result = LZ4HC_compress_optimal(ctx,
+ src, dst, srcSizePtr, dstCapacity,
cParam.nbSearches, cParam.targetLength, limit,
- cLevel == LZ4HC_CLEVEL_MAX, /* ultra mode */
- dict, favor);
+ cLevel == LZ4HC_CLEVEL_MAX, /* ultra mode */
+ dict, favor);
}
- if (result <= 0) ctx->dirty = 1;
- return result;
+ if (result <= 0) ctx->dirty = 1;
+ return result;
}
}
-static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock);
-
-static int
-LZ4HC_compress_generic_noDictCtx (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- assert(ctx->dictCtx == NULL);
- return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, noDictCtx);
-}
-
-static int
-LZ4HC_compress_generic_dictCtx (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- const size_t position = (size_t)(ctx->end - ctx->base) - ctx->lowLimit;
- assert(ctx->dictCtx != NULL);
- if (position >= 64 KB) {
- ctx->dictCtx = NULL;
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else if (position == 0 && *srcSizePtr > 4 KB) {
- memcpy(ctx, ctx->dictCtx, sizeof(LZ4HC_CCtx_internal));
- LZ4HC_setExternalDict(ctx, (const BYTE *)src);
- ctx->compressionLevel = (short)cLevel;
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else {
- return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, usingDictCtxHc);
- }
-}
-
-static int
-LZ4HC_compress_generic (
- LZ4HC_CCtx_internal* const ctx,
- const char* const src,
- char* const dst,
- int* const srcSizePtr,
- int const dstCapacity,
- int cLevel,
- limitedOutput_directive limit
- )
-{
- if (ctx->dictCtx == NULL) {
- return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- } else {
- return LZ4HC_compress_generic_dictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
- }
-}
-
-
-int LZ4_sizeofStateHC(void) { return (int)sizeof(LZ4_streamHC_t); }
-
-static size_t LZ4_streamHC_t_alignment(void)
+static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock);
+
+static int
+LZ4HC_compress_generic_noDictCtx (
+ LZ4HC_CCtx_internal* const ctx,
+ const char* const src,
+ char* const dst,
+ int* const srcSizePtr,
+ int const dstCapacity,
+ int cLevel,
+ limitedOutput_directive limit
+ )
+{
+ assert(ctx->dictCtx == NULL);
+ return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, noDictCtx);
+}
+
+static int
+LZ4HC_compress_generic_dictCtx (
+ LZ4HC_CCtx_internal* const ctx,
+ const char* const src,
+ char* const dst,
+ int* const srcSizePtr,
+ int const dstCapacity,
+ int cLevel,
+ limitedOutput_directive limit
+ )
{
+ const size_t position = (size_t)(ctx->end - ctx->base) - ctx->lowLimit;
+ assert(ctx->dictCtx != NULL);
+ if (position >= 64 KB) {
+ ctx->dictCtx = NULL;
+ return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
+ } else if (position == 0 && *srcSizePtr > 4 KB) {
+ memcpy(ctx, ctx->dictCtx, sizeof(LZ4HC_CCtx_internal));
+ LZ4HC_setExternalDict(ctx, (const BYTE *)src);
+ ctx->compressionLevel = (short)cLevel;
+ return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
+ } else {
+ return LZ4HC_compress_generic_internal(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit, usingDictCtxHc);
+ }
+}
+
+static int
+LZ4HC_compress_generic (
+ LZ4HC_CCtx_internal* const ctx,
+ const char* const src,
+ char* const dst,
+ int* const srcSizePtr,
+ int const dstCapacity,
+ int cLevel,
+ limitedOutput_directive limit
+ )
+{
+ if (ctx->dictCtx == NULL) {
+ return LZ4HC_compress_generic_noDictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
+ } else {
+ return LZ4HC_compress_generic_dictCtx(ctx, src, dst, srcSizePtr, dstCapacity, cLevel, limit);
+ }
+}
+
+
+int LZ4_sizeofStateHC(void) { return (int)sizeof(LZ4_streamHC_t); }
+
+static size_t LZ4_streamHC_t_alignment(void)
+{
#if LZ4_ALIGN_TEST
typedef struct { char c; LZ4_streamHC_t t; } t_a;
return sizeof(t_a) - sizeof(LZ4_streamHC_t);
#else
return 1; /* effectively disabled */
#endif
-}
-
-/* state is presumed correctly initialized,
- * in which case its size and alignment have already been validate */
-int LZ4_compress_HC_extStateHC_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
-{
- LZ4HC_CCtx_internal* const ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
+}
+
+/* state is presumed correctly initialized,
+ * in which case its size and alignment have already been validate */
+int LZ4_compress_HC_extStateHC_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
+{
+ LZ4HC_CCtx_internal* const ctx = &((LZ4_streamHC_t*)state)->internal_donotuse;
if (!LZ4_isAligned(state, LZ4_streamHC_t_alignment())) return 0;
- LZ4_resetStreamHC_fast((LZ4_streamHC_t*)state, compressionLevel);
- LZ4HC_init_internal (ctx, (const BYTE*)src);
- if (dstCapacity < LZ4_compressBound(srcSize))
- return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, limitedOutput);
+ LZ4_resetStreamHC_fast((LZ4_streamHC_t*)state, compressionLevel);
+ LZ4HC_init_internal (ctx, (const BYTE*)src);
+ if (dstCapacity < LZ4_compressBound(srcSize))
+ return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, limitedOutput);
else
- return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, notLimited);
-}
-
-int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
-{
- LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
- if (ctx==NULL) return 0; /* init failure */
- return LZ4_compress_HC_extStateHC_fastReset(state, src, dst, srcSize, dstCapacity, compressionLevel);
+ return LZ4HC_compress_generic (ctx, src, dst, &srcSize, dstCapacity, compressionLevel, notLimited);
}
-int LZ4_compress_HC(const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
+int LZ4_compress_HC_extStateHC (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
{
+ LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
+ if (ctx==NULL) return 0; /* init failure */
+ return LZ4_compress_HC_extStateHC_fastReset(state, src, dst, srcSize, dstCapacity, compressionLevel);
+}
+
+int LZ4_compress_HC(const char* src, char* dst, int srcSize, int dstCapacity, int compressionLevel)
+{
#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
- LZ4_streamHC_t* const statePtr = (LZ4_streamHC_t*)ALLOC(sizeof(LZ4_streamHC_t));
+ LZ4_streamHC_t* const statePtr = (LZ4_streamHC_t*)ALLOC(sizeof(LZ4_streamHC_t));
#else
LZ4_streamHC_t state;
LZ4_streamHC_t* const statePtr = &state;
#endif
- int const cSize = LZ4_compress_HC_extStateHC(statePtr, src, dst, srcSize, dstCapacity, compressionLevel);
+ int const cSize = LZ4_compress_HC_extStateHC(statePtr, src, dst, srcSize, dstCapacity, compressionLevel);
#if defined(LZ4HC_HEAPMODE) && LZ4HC_HEAPMODE==1
- FREEMEM(statePtr);
+ FREEMEM(statePtr);
#endif
return cSize;
}
-/* state is presumed sized correctly (>= sizeof(LZ4_streamHC_t)) */
-int LZ4_compress_HC_destSize(void* state, const char* source, char* dest, int* sourceSizePtr, int targetDestSize, int cLevel)
-{
- LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
- if (ctx==NULL) return 0; /* init failure */
- LZ4HC_init_internal(&ctx->internal_donotuse, (const BYTE*) source);
- LZ4_setCompressionLevel(ctx, cLevel);
- return LZ4HC_compress_generic(&ctx->internal_donotuse, source, dest, sourceSizePtr, targetDestSize, cLevel, fillOutput);
-}
-
+/* state is presumed sized correctly (>= sizeof(LZ4_streamHC_t)) */
+int LZ4_compress_HC_destSize(void* state, const char* source, char* dest, int* sourceSizePtr, int targetDestSize, int cLevel)
+{
+ LZ4_streamHC_t* const ctx = LZ4_initStreamHC(state, sizeof(*ctx));
+ if (ctx==NULL) return 0; /* init failure */
+ LZ4HC_init_internal(&ctx->internal_donotuse, (const BYTE*) source);
+ LZ4_setCompressionLevel(ctx, cLevel);
+ return LZ4HC_compress_generic(&ctx->internal_donotuse, source, dest, sourceSizePtr, targetDestSize, cLevel, fillOutput);
+}
+
/**************************************
* Streaming Functions
**************************************/
/* allocation */
-LZ4_streamHC_t* LZ4_createStreamHC(void)
-{
+LZ4_streamHC_t* LZ4_createStreamHC(void)
+{
LZ4_streamHC_t* const state =
(LZ4_streamHC_t*)ALLOC_AND_ZERO(sizeof(LZ4_streamHC_t));
if (state == NULL) return NULL;
LZ4_setCompressionLevel(state, LZ4HC_CLEVEL_DEFAULT);
return state;
-}
-
-int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr)
+}
+
+int LZ4_freeStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr)
+{
+ DEBUGLOG(4, "LZ4_freeStreamHC(%p)", LZ4_streamHCPtr);
+ if (!LZ4_streamHCPtr) return 0; /* support free on NULL */
+ FREEMEM(LZ4_streamHCPtr);
+ return 0;
+}
+
+
+LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size)
{
- DEBUGLOG(4, "LZ4_freeStreamHC(%p)", LZ4_streamHCPtr);
- if (!LZ4_streamHCPtr) return 0; /* support free on NULL */
- FREEMEM(LZ4_streamHCPtr);
- return 0;
-}
-
-
-LZ4_streamHC_t* LZ4_initStreamHC (void* buffer, size_t size)
-{
- LZ4_streamHC_t* const LZ4_streamHCPtr = (LZ4_streamHC_t*)buffer;
+ LZ4_streamHC_t* const LZ4_streamHCPtr = (LZ4_streamHC_t*)buffer;
/* if compilation fails here, LZ4_STREAMHCSIZE must be increased */
LZ4_STATIC_ASSERT(sizeof(LZ4HC_CCtx_internal) <= LZ4_STREAMHCSIZE);
DEBUGLOG(4, "LZ4_initStreamHC(%p, %u)", buffer, (unsigned)size);
/* check conditions */
- if (buffer == NULL) return NULL;
- if (size < sizeof(LZ4_streamHC_t)) return NULL;
+ if (buffer == NULL) return NULL;
+ if (size < sizeof(LZ4_streamHC_t)) return NULL;
if (!LZ4_isAligned(buffer, LZ4_streamHC_t_alignment())) return NULL;
/* init */
{ LZ4HC_CCtx_internal* const hcstate = &(LZ4_streamHCPtr->internal_donotuse);
MEM_INIT(hcstate, 0, sizeof(*hcstate)); }
- LZ4_setCompressionLevel(LZ4_streamHCPtr, LZ4HC_CLEVEL_DEFAULT);
- return LZ4_streamHCPtr;
-}
-
-/* just a stub */
-void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
-{
- LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
- LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
+ LZ4_setCompressionLevel(LZ4_streamHCPtr, LZ4HC_CLEVEL_DEFAULT);
+ return LZ4_streamHCPtr;
}
-void LZ4_resetStreamHC_fast (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
+/* just a stub */
+void LZ4_resetStreamHC (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
{
- DEBUGLOG(4, "LZ4_resetStreamHC_fast(%p, %d)", LZ4_streamHCPtr, compressionLevel);
- if (LZ4_streamHCPtr->internal_donotuse.dirty) {
- LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
- } else {
- /* preserve end - base : can trigger clearTable's threshold */
+ LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
+ LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
+}
+
+void LZ4_resetStreamHC_fast (LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
+{
+ DEBUGLOG(4, "LZ4_resetStreamHC_fast(%p, %d)", LZ4_streamHCPtr, compressionLevel);
+ if (LZ4_streamHCPtr->internal_donotuse.dirty) {
+ LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
+ } else {
+ /* preserve end - base : can trigger clearTable's threshold */
if (LZ4_streamHCPtr->internal_donotuse.end != NULL) {
LZ4_streamHCPtr->internal_donotuse.end -= (uptrval)LZ4_streamHCPtr->internal_donotuse.base;
} else {
assert(LZ4_streamHCPtr->internal_donotuse.base == NULL);
}
- LZ4_streamHCPtr->internal_donotuse.base = NULL;
- LZ4_streamHCPtr->internal_donotuse.dictCtx = NULL;
- }
- LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
-}
-
-void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
-{
- DEBUGLOG(5, "LZ4_setCompressionLevel(%p, %d)", LZ4_streamHCPtr, compressionLevel);
- if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;
- if (compressionLevel > LZ4HC_CLEVEL_MAX) compressionLevel = LZ4HC_CLEVEL_MAX;
- LZ4_streamHCPtr->internal_donotuse.compressionLevel = (short)compressionLevel;
-}
-
-void LZ4_favorDecompressionSpeed(LZ4_streamHC_t* LZ4_streamHCPtr, int favor)
-{
- LZ4_streamHCPtr->internal_donotuse.favorDecSpeed = (favor!=0);
-}
-
-/* LZ4_loadDictHC() :
- * LZ4_streamHCPtr is presumed properly initialized */
-int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr,
- const char* dictionary, int dictSize)
-{
- LZ4HC_CCtx_internal* const ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
+ LZ4_streamHCPtr->internal_donotuse.base = NULL;
+ LZ4_streamHCPtr->internal_donotuse.dictCtx = NULL;
+ }
+ LZ4_setCompressionLevel(LZ4_streamHCPtr, compressionLevel);
+}
+
+void LZ4_setCompressionLevel(LZ4_streamHC_t* LZ4_streamHCPtr, int compressionLevel)
+{
+ DEBUGLOG(5, "LZ4_setCompressionLevel(%p, %d)", LZ4_streamHCPtr, compressionLevel);
+ if (compressionLevel < 1) compressionLevel = LZ4HC_CLEVEL_DEFAULT;
+ if (compressionLevel > LZ4HC_CLEVEL_MAX) compressionLevel = LZ4HC_CLEVEL_MAX;
+ LZ4_streamHCPtr->internal_donotuse.compressionLevel = (short)compressionLevel;
+}
+
+void LZ4_favorDecompressionSpeed(LZ4_streamHC_t* LZ4_streamHCPtr, int favor)
+{
+ LZ4_streamHCPtr->internal_donotuse.favorDecSpeed = (favor!=0);
+}
+
+/* LZ4_loadDictHC() :
+ * LZ4_streamHCPtr is presumed properly initialized */
+int LZ4_loadDictHC (LZ4_streamHC_t* LZ4_streamHCPtr,
+ const char* dictionary, int dictSize)
+{
+ LZ4HC_CCtx_internal* const ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
DEBUGLOG(4, "LZ4_loadDictHC(ctx:%p, dict:%p, dictSize:%d)", LZ4_streamHCPtr, dictionary, dictSize);
- assert(LZ4_streamHCPtr != NULL);
+ assert(LZ4_streamHCPtr != NULL);
if (dictSize > 64 KB) {
- dictionary += (size_t)dictSize - 64 KB;
+ dictionary += (size_t)dictSize - 64 KB;
dictSize = 64 KB;
}
- /* need a full initialization, there are bad side-effects when using resetFast() */
- { int const cLevel = ctxPtr->compressionLevel;
- LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
- LZ4_setCompressionLevel(LZ4_streamHCPtr, cLevel);
- }
- LZ4HC_init_internal (ctxPtr, (const BYTE*)dictionary);
+ /* need a full initialization, there are bad side-effects when using resetFast() */
+ { int const cLevel = ctxPtr->compressionLevel;
+ LZ4_initStreamHC(LZ4_streamHCPtr, sizeof(*LZ4_streamHCPtr));
+ LZ4_setCompressionLevel(LZ4_streamHCPtr, cLevel);
+ }
+ LZ4HC_init_internal (ctxPtr, (const BYTE*)dictionary);
ctxPtr->end = (const BYTE*)dictionary + dictSize;
- if (dictSize >= 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3);
+ if (dictSize >= 4) LZ4HC_Insert (ctxPtr, ctxPtr->end-3);
return dictSize;
}
-void LZ4_attach_HC_dictionary(LZ4_streamHC_t *working_stream, const LZ4_streamHC_t *dictionary_stream) {
- working_stream->internal_donotuse.dictCtx = dictionary_stream != NULL ? &(dictionary_stream->internal_donotuse) : NULL;
-}
+void LZ4_attach_HC_dictionary(LZ4_streamHC_t *working_stream, const LZ4_streamHC_t *dictionary_stream) {
+ working_stream->internal_donotuse.dictCtx = dictionary_stream != NULL ? &(dictionary_stream->internal_donotuse) : NULL;
+}
/* compression */
static void LZ4HC_setExternalDict(LZ4HC_CCtx_internal* ctxPtr, const BYTE* newBlock)
{
- DEBUGLOG(4, "LZ4HC_setExternalDict(%p, %p)", ctxPtr, newBlock);
- if (ctxPtr->end >= ctxPtr->base + ctxPtr->dictLimit + 4)
- LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
+ DEBUGLOG(4, "LZ4HC_setExternalDict(%p, %p)", ctxPtr, newBlock);
+ if (ctxPtr->end >= ctxPtr->base + ctxPtr->dictLimit + 4)
+ LZ4HC_Insert (ctxPtr, ctxPtr->end-3); /* Referencing remaining dictionary content */
/* Only one memory segment for extDict, so any previous extDict is lost at this stage */
ctxPtr->lowLimit = ctxPtr->dictLimit;
@@ -1108,12 +1108,12 @@ LZ4_compressHC_continue_generic (LZ4_streamHC_t* LZ4_streamHCPtr,
int* srcSizePtr, int dstCapacity,
limitedOutput_directive limit)
{
- LZ4HC_CCtx_internal* const ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
+ LZ4HC_CCtx_internal* const ctxPtr = &LZ4_streamHCPtr->internal_donotuse;
DEBUGLOG(5, "LZ4_compressHC_continue_generic(ctx=%p, src=%p, srcSize=%d, limit=%d)",
LZ4_streamHCPtr, src, *srcSizePtr, limit);
- assert(ctxPtr != NULL);
+ assert(ctxPtr != NULL);
/* auto-init if forgotten */
- if (ctxPtr->base == NULL) LZ4HC_init_internal (ctxPtr, (const BYTE*) src);
+ if (ctxPtr->base == NULL) LZ4HC_init_internal (ctxPtr, (const BYTE*) src);
/* Check overflow */
if ((size_t)(ctxPtr->end - ctxPtr->base) > 2 GB) {
@@ -1123,37 +1123,37 @@ LZ4_compressHC_continue_generic (LZ4_streamHC_t* LZ4_streamHCPtr,
}
/* Check if blocks follow each other */
- if ((const BYTE*)src != ctxPtr->end)
- LZ4HC_setExternalDict(ctxPtr, (const BYTE*)src);
+ if ((const BYTE*)src != ctxPtr->end)
+ LZ4HC_setExternalDict(ctxPtr, (const BYTE*)src);
/* Check overlapping input/dictionary space */
- { const BYTE* sourceEnd = (const BYTE*) src + *srcSizePtr;
+ { const BYTE* sourceEnd = (const BYTE*) src + *srcSizePtr;
const BYTE* const dictBegin = ctxPtr->dictBase + ctxPtr->lowLimit;
const BYTE* const dictEnd = ctxPtr->dictBase + ctxPtr->dictLimit;
- if ((sourceEnd > dictBegin) && ((const BYTE*)src < dictEnd)) {
+ if ((sourceEnd > dictBegin) && ((const BYTE*)src < dictEnd)) {
if (sourceEnd > dictEnd) sourceEnd = dictEnd;
ctxPtr->lowLimit = (U32)(sourceEnd - ctxPtr->dictBase);
if (ctxPtr->dictLimit - ctxPtr->lowLimit < 4) ctxPtr->lowLimit = ctxPtr->dictLimit;
} }
- return LZ4HC_compress_generic (ctxPtr, src, dst, srcSizePtr, dstCapacity, ctxPtr->compressionLevel, limit);
+ return LZ4HC_compress_generic (ctxPtr, src, dst, srcSizePtr, dstCapacity, ctxPtr->compressionLevel, limit);
}
-int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* src, char* dst, int srcSize, int dstCapacity)
+int LZ4_compress_HC_continue (LZ4_streamHC_t* LZ4_streamHCPtr, const char* src, char* dst, int srcSize, int dstCapacity)
{
- if (dstCapacity < LZ4_compressBound(srcSize))
- return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, src, dst, &srcSize, dstCapacity, limitedOutput);
+ if (dstCapacity < LZ4_compressBound(srcSize))
+ return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, src, dst, &srcSize, dstCapacity, limitedOutput);
else
- return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, src, dst, &srcSize, dstCapacity, notLimited);
-}
-
-int LZ4_compress_HC_continue_destSize (LZ4_streamHC_t* LZ4_streamHCPtr, const char* src, char* dst, int* srcSizePtr, int targetDestSize)
-{
- return LZ4_compressHC_continue_generic(LZ4_streamHCPtr, src, dst, srcSizePtr, targetDestSize, fillOutput);
+ return LZ4_compressHC_continue_generic (LZ4_streamHCPtr, src, dst, &srcSize, dstCapacity, notLimited);
}
+int LZ4_compress_HC_continue_destSize (LZ4_streamHC_t* LZ4_streamHCPtr, const char* src, char* dst, int* srcSizePtr, int targetDestSize)
+{
+ return LZ4_compressHC_continue_generic(LZ4_streamHCPtr, src, dst, srcSizePtr, targetDestSize, fillOutput);
+}
-
+
+
/* LZ4_saveDictHC :
* save history content
* into a user-provided buffer
@@ -1174,8 +1174,8 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
{ U32 const endIndex = (U32)(streamPtr->end - streamPtr->base);
streamPtr->end = (const BYTE*)safeBuffer + dictSize;
streamPtr->base = streamPtr->end - endIndex;
- streamPtr->dictLimit = endIndex - (U32)dictSize;
- streamPtr->lowLimit = endIndex - (U32)dictSize;
+ streamPtr->dictLimit = endIndex - (U32)dictSize;
+ streamPtr->lowLimit = endIndex - (U32)dictSize;
if (streamPtr->nextToUpdate < streamPtr->dictLimit)
streamPtr->nextToUpdate = streamPtr->dictLimit;
}
@@ -1183,13 +1183,13 @@ int LZ4_saveDictHC (LZ4_streamHC_t* LZ4_streamHCPtr, char* safeBuffer, int dictS
}
-/***************************************************
+/***************************************************
* Deprecated Functions
-***************************************************/
-
+***************************************************/
+
/* These functions currently generate deprecation warnings */
-
-/* Wrappers for deprecated compression functions */
+
+/* Wrappers for deprecated compression functions */
int LZ4_compressHC(const char* src, char* dst, int srcSize) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), 0); }
int LZ4_compressHC_limitedOutput(const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_HC(src, dst, srcSize, maxDstSize, 0); }
int LZ4_compressHC2(const char* src, char* dst, int srcSize, int cLevel) { return LZ4_compress_HC (src, dst, srcSize, LZ4_compressBound(srcSize), cLevel); }
@@ -1205,389 +1205,389 @@ int LZ4_compressHC_limitedOutput_continue (LZ4_streamHC_t* ctx, const char* src,
/* Deprecated streaming functions */
int LZ4_sizeofStreamStateHC(void) { return LZ4_STREAMHCSIZE; }
-/* state is presumed correctly sized, aka >= sizeof(LZ4_streamHC_t)
- * @return : 0 on success, !=0 if error */
+/* state is presumed correctly sized, aka >= sizeof(LZ4_streamHC_t)
+ * @return : 0 on success, !=0 if error */
int LZ4_resetStreamStateHC(void* state, char* inputBuffer)
{
- LZ4_streamHC_t* const hc4 = LZ4_initStreamHC(state, sizeof(*hc4));
- if (hc4 == NULL) return 1; /* init failed */
- LZ4HC_init_internal (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
+ LZ4_streamHC_t* const hc4 = LZ4_initStreamHC(state, sizeof(*hc4));
+ if (hc4 == NULL) return 1; /* init failed */
+ LZ4HC_init_internal (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
return 0;
}
-void* LZ4_createHC (const char* inputBuffer)
+void* LZ4_createHC (const char* inputBuffer)
{
- LZ4_streamHC_t* const hc4 = LZ4_createStreamHC();
+ LZ4_streamHC_t* const hc4 = LZ4_createStreamHC();
if (hc4 == NULL) return NULL; /* not enough memory */
- LZ4HC_init_internal (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
+ LZ4HC_init_internal (&hc4->internal_donotuse, (const BYTE*)inputBuffer);
return hc4;
}
-int LZ4_freeHC (void* LZ4HC_Data)
-{
- if (!LZ4HC_Data) return 0; /* support free on NULL */
- FREEMEM(LZ4HC_Data);
- return 0;
-}
+int LZ4_freeHC (void* LZ4HC_Data)
+{
+ if (!LZ4HC_Data) return 0; /* support free on NULL */
+ FREEMEM(LZ4HC_Data);
+ return 0;
+}
-int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* src, char* dst, int srcSize, int cLevel)
+int LZ4_compressHC2_continue (void* LZ4HC_Data, const char* src, char* dst, int srcSize, int cLevel)
{
- return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, src, dst, &srcSize, 0, cLevel, notLimited);
+ return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, src, dst, &srcSize, 0, cLevel, notLimited);
}
-int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* src, char* dst, int srcSize, int dstCapacity, int cLevel)
+int LZ4_compressHC2_limitedOutput_continue (void* LZ4HC_Data, const char* src, char* dst, int srcSize, int dstCapacity, int cLevel)
{
- return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, src, dst, &srcSize, dstCapacity, cLevel, limitedOutput);
+ return LZ4HC_compress_generic (&((LZ4_streamHC_t*)LZ4HC_Data)->internal_donotuse, src, dst, &srcSize, dstCapacity, cLevel, limitedOutput);
}
char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
{
- LZ4_streamHC_t *ctx = (LZ4_streamHC_t*)LZ4HC_Data;
- const BYTE *bufferStart = ctx->internal_donotuse.base + ctx->internal_donotuse.lowLimit;
- LZ4_resetStreamHC_fast(ctx, ctx->internal_donotuse.compressionLevel);
- /* avoid const char * -> char * conversion warning :( */
- return (char *)(uptrval)bufferStart;
+ LZ4_streamHC_t *ctx = (LZ4_streamHC_t*)LZ4HC_Data;
+ const BYTE *bufferStart = ctx->internal_donotuse.base + ctx->internal_donotuse.lowLimit;
+ LZ4_resetStreamHC_fast(ctx, ctx->internal_donotuse.compressionLevel);
+ /* avoid const char * -> char * conversion warning :( */
+ return (char *)(uptrval)bufferStart;
}
-
-
-/* ================================================
- * LZ4 Optimal parser (levels [LZ4HC_CLEVEL_OPT_MIN - LZ4HC_CLEVEL_MAX])
- * ===============================================*/
-typedef struct {
- int price;
- int off;
- int mlen;
- int litlen;
-} LZ4HC_optimal_t;
-
-/* price in bytes */
-LZ4_FORCE_INLINE int LZ4HC_literalsPrice(int const litlen)
-{
- int price = litlen;
- assert(litlen >= 0);
- if (litlen >= (int)RUN_MASK)
- price += 1 + ((litlen-(int)RUN_MASK) / 255);
- return price;
-}
-
-
-/* requires mlen >= MINMATCH */
-LZ4_FORCE_INLINE int LZ4HC_sequencePrice(int litlen, int mlen)
-{
- int price = 1 + 2 ; /* token + 16-bit offset */
- assert(litlen >= 0);
- assert(mlen >= MINMATCH);
-
- price += LZ4HC_literalsPrice(litlen);
-
- if (mlen >= (int)(ML_MASK+MINMATCH))
- price += 1 + ((mlen-(int)(ML_MASK+MINMATCH)) / 255);
-
- return price;
-}
-
-
-typedef struct {
- int off;
- int len;
-} LZ4HC_match_t;
-
-LZ4_FORCE_INLINE LZ4HC_match_t
-LZ4HC_FindLongerMatch(LZ4HC_CCtx_internal* const ctx,
- const BYTE* ip, const BYTE* const iHighLimit,
- int minLen, int nbSearches,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
-{
- LZ4HC_match_t match = { 0 , 0 };
- const BYTE* matchPtr = NULL;
- /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
- * but this won't be the case here, as we define iLowLimit==ip,
- * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
- int matchLength = LZ4HC_InsertAndGetWiderMatch(ctx, ip, ip, iHighLimit, minLen, &matchPtr, &ip, nbSearches, 1 /*patternAnalysis*/, 1 /*chainSwap*/, dict, favorDecSpeed);
- if (matchLength <= minLen) return match;
- if (favorDecSpeed) {
- if ((matchLength>18) & (matchLength<=36)) matchLength=18; /* favor shortcut */
- }
- match.len = matchLength;
- match.off = (int)(ip-matchPtr);
- return match;
-}
-
-
-static int LZ4HC_compress_optimal ( LZ4HC_CCtx_internal* ctx,
- const char* const source,
- char* dst,
- int* srcSizePtr,
- int dstCapacity,
- int const nbSearches,
- size_t sufficient_len,
- const limitedOutput_directive limit,
- int const fullUpdate,
- const dictCtx_directive dict,
- const HCfavor_e favorDecSpeed)
-{
+
+
+/* ================================================
+ * LZ4 Optimal parser (levels [LZ4HC_CLEVEL_OPT_MIN - LZ4HC_CLEVEL_MAX])
+ * ===============================================*/
+typedef struct {
+ int price;
+ int off;
+ int mlen;
+ int litlen;
+} LZ4HC_optimal_t;
+
+/* price in bytes */
+LZ4_FORCE_INLINE int LZ4HC_literalsPrice(int const litlen)
+{
+ int price = litlen;
+ assert(litlen >= 0);
+ if (litlen >= (int)RUN_MASK)
+ price += 1 + ((litlen-(int)RUN_MASK) / 255);
+ return price;
+}
+
+
+/* requires mlen >= MINMATCH */
+LZ4_FORCE_INLINE int LZ4HC_sequencePrice(int litlen, int mlen)
+{
+ int price = 1 + 2 ; /* token + 16-bit offset */
+ assert(litlen >= 0);
+ assert(mlen >= MINMATCH);
+
+ price += LZ4HC_literalsPrice(litlen);
+
+ if (mlen >= (int)(ML_MASK+MINMATCH))
+ price += 1 + ((mlen-(int)(ML_MASK+MINMATCH)) / 255);
+
+ return price;
+}
+
+
+typedef struct {
+ int off;
+ int len;
+} LZ4HC_match_t;
+
+LZ4_FORCE_INLINE LZ4HC_match_t
+LZ4HC_FindLongerMatch(LZ4HC_CCtx_internal* const ctx,
+ const BYTE* ip, const BYTE* const iHighLimit,
+ int minLen, int nbSearches,
+ const dictCtx_directive dict,
+ const HCfavor_e favorDecSpeed)
+{
+ LZ4HC_match_t match = { 0 , 0 };
+ const BYTE* matchPtr = NULL;
+ /* note : LZ4HC_InsertAndGetWiderMatch() is able to modify the starting position of a match (*startpos),
+ * but this won't be the case here, as we define iLowLimit==ip,
+ * so LZ4HC_InsertAndGetWiderMatch() won't be allowed to search past ip */
+ int matchLength = LZ4HC_InsertAndGetWiderMatch(ctx, ip, ip, iHighLimit, minLen, &matchPtr, &ip, nbSearches, 1 /*patternAnalysis*/, 1 /*chainSwap*/, dict, favorDecSpeed);
+ if (matchLength <= minLen) return match;
+ if (favorDecSpeed) {
+ if ((matchLength>18) & (matchLength<=36)) matchLength=18; /* favor shortcut */
+ }
+ match.len = matchLength;
+ match.off = (int)(ip-matchPtr);
+ return match;
+}
+
+
+static int LZ4HC_compress_optimal ( LZ4HC_CCtx_internal* ctx,
+ const char* const source,
+ char* dst,
+ int* srcSizePtr,
+ int dstCapacity,
+ int const nbSearches,
+ size_t sufficient_len,
+ const limitedOutput_directive limit,
+ int const fullUpdate,
+ const dictCtx_directive dict,
+ const HCfavor_e favorDecSpeed)
+{
int retval = 0;
-#define TRAILING_LITERALS 3
+#define TRAILING_LITERALS 3
#ifdef LZ4HC_HEAPMODE
LZ4HC_optimal_t* const opt = (LZ4HC_optimal_t*)ALLOC(sizeof(LZ4HC_optimal_t) * (LZ4_OPT_NUM + TRAILING_LITERALS));
#else
- LZ4HC_optimal_t opt[LZ4_OPT_NUM + TRAILING_LITERALS]; /* ~64 KB, which is a bit large for stack... */
+ LZ4HC_optimal_t opt[LZ4_OPT_NUM + TRAILING_LITERALS]; /* ~64 KB, which is a bit large for stack... */
#endif
-
- const BYTE* ip = (const BYTE*) source;
- const BYTE* anchor = ip;
- const BYTE* const iend = ip + *srcSizePtr;
- const BYTE* const mflimit = iend - MFLIMIT;
- const BYTE* const matchlimit = iend - LASTLITERALS;
- BYTE* op = (BYTE*) dst;
- BYTE* opSaved = (BYTE*) dst;
- BYTE* oend = op + dstCapacity;
+
+ const BYTE* ip = (const BYTE*) source;
+ const BYTE* anchor = ip;
+ const BYTE* const iend = ip + *srcSizePtr;
+ const BYTE* const mflimit = iend - MFLIMIT;
+ const BYTE* const matchlimit = iend - LASTLITERALS;
+ BYTE* op = (BYTE*) dst;
+ BYTE* opSaved = (BYTE*) dst;
+ BYTE* oend = op + dstCapacity;
int ovml = MINMATCH; /* overflow - last sequence */
const BYTE* ovref = NULL;
-
- /* init */
+
+ /* init */
#ifdef LZ4HC_HEAPMODE
if (opt == NULL) goto _return_label;
#endif
- DEBUGLOG(5, "LZ4HC_compress_optimal(dst=%p, dstCapa=%u)", dst, (unsigned)dstCapacity);
- *srcSizePtr = 0;
- if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
- if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
-
- /* Main Loop */
- while (ip <= mflimit) {
- int const llen = (int)(ip - anchor);
- int best_mlen, best_off;
- int cur, last_match_pos = 0;
-
- LZ4HC_match_t const firstMatch = LZ4HC_FindLongerMatch(ctx, ip, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
- if (firstMatch.len==0) { ip++; continue; }
-
- if ((size_t)firstMatch.len > sufficient_len) {
- /* good enough solution : immediate encoding */
- int const firstML = firstMatch.len;
- const BYTE* const matchPos = ip - firstMatch.off;
- opSaved = op;
+ DEBUGLOG(5, "LZ4HC_compress_optimal(dst=%p, dstCapa=%u)", dst, (unsigned)dstCapacity);
+ *srcSizePtr = 0;
+ if (limit == fillOutput) oend -= LASTLITERALS; /* Hack for support LZ4 format restriction */
+ if (sufficient_len >= LZ4_OPT_NUM) sufficient_len = LZ4_OPT_NUM-1;
+
+ /* Main Loop */
+ while (ip <= mflimit) {
+ int const llen = (int)(ip - anchor);
+ int best_mlen, best_off;
+ int cur, last_match_pos = 0;
+
+ LZ4HC_match_t const firstMatch = LZ4HC_FindLongerMatch(ctx, ip, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
+ if (firstMatch.len==0) { ip++; continue; }
+
+ if ((size_t)firstMatch.len > sufficient_len) {
+ /* good enough solution : immediate encoding */
+ int const firstML = firstMatch.len;
+ const BYTE* const matchPos = ip - firstMatch.off;
+ opSaved = op;
if ( LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), firstML, matchPos, limit, oend) ) { /* updates ip, op and anchor */
ovml = firstML;
ovref = matchPos;
- goto _dest_overflow;
- }
- continue;
- }
-
- /* set prices for first positions (literals) */
- { int rPos;
- for (rPos = 0 ; rPos < MINMATCH ; rPos++) {
- int const cost = LZ4HC_literalsPrice(llen + rPos);
- opt[rPos].mlen = 1;
- opt[rPos].off = 0;
- opt[rPos].litlen = llen + rPos;
- opt[rPos].price = cost;
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
- rPos, cost, opt[rPos].litlen);
- } }
- /* set prices using initial match */
- { int mlen = MINMATCH;
- int const matchML = firstMatch.len; /* necessarily < sufficient_len < LZ4_OPT_NUM */
- int const offset = firstMatch.off;
- assert(matchML < LZ4_OPT_NUM);
- for ( ; mlen <= matchML ; mlen++) {
- int const cost = LZ4HC_sequencePrice(llen, mlen);
- opt[mlen].mlen = mlen;
- opt[mlen].off = offset;
- opt[mlen].litlen = llen;
- opt[mlen].price = cost;
- DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i) -- initial setup",
- mlen, cost, mlen);
- } }
- last_match_pos = firstMatch.len;
- { int addLit;
- for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
- opt[last_match_pos+addLit].mlen = 1; /* literal */
- opt[last_match_pos+addLit].off = 0;
- opt[last_match_pos+addLit].litlen = addLit;
- opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
- last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
- } }
-
- /* check further positions */
- for (cur = 1; cur < last_match_pos; cur++) {
- const BYTE* const curPtr = ip + cur;
- LZ4HC_match_t newMatch;
-
- if (curPtr > mflimit) break;
- DEBUGLOG(7, "rPos:%u[%u] vs [%u]%u",
- cur, opt[cur].price, opt[cur+1].price, cur+1);
- if (fullUpdate) {
- /* not useful to search here if next position has same (or lower) cost */
- if ( (opt[cur+1].price <= opt[cur].price)
- /* in some cases, next position has same cost, but cost rises sharply after, so a small match would still be beneficial */
- && (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/) )
- continue;
- } else {
- /* not useful to search here if next position has same (or lower) cost */
- if (opt[cur+1].price <= opt[cur].price) continue;
+ goto _dest_overflow;
}
-
- DEBUGLOG(7, "search at rPos:%u", cur);
- if (fullUpdate)
- newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
- else
- /* only test matches of minimum length; slightly faster, but misses a few bytes */
- newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, last_match_pos - cur, nbSearches, dict, favorDecSpeed);
- if (!newMatch.len) continue;
-
- if ( ((size_t)newMatch.len > sufficient_len)
- || (newMatch.len + cur >= LZ4_OPT_NUM) ) {
- /* immediate encoding */
- best_mlen = newMatch.len;
- best_off = newMatch.off;
- last_match_pos = cur + 1;
- goto encode;
- }
-
- /* before match : set price with literals at beginning */
- { int const baseLitlen = opt[cur].litlen;
- int litlen;
- for (litlen = 1; litlen < MINMATCH; litlen++) {
- int const price = opt[cur].price - LZ4HC_literalsPrice(baseLitlen) + LZ4HC_literalsPrice(baseLitlen+litlen);
- int const pos = cur + litlen;
- if (price < opt[pos].price) {
- opt[pos].mlen = 1; /* literal */
- opt[pos].off = 0;
- opt[pos].litlen = baseLitlen+litlen;
- opt[pos].price = price;
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)",
- pos, price, opt[pos].litlen);
- } } }
-
- /* set prices using match at position = cur */
- { int const matchML = newMatch.len;
- int ml = MINMATCH;
-
- assert(cur + newMatch.len < LZ4_OPT_NUM);
- for ( ; ml <= matchML ; ml++) {
- int const pos = cur + ml;
- int const offset = newMatch.off;
- int price;
- int ll;
- DEBUGLOG(7, "testing price rPos %i (last_match_pos=%i)",
- pos, last_match_pos);
- if (opt[cur].mlen == 1) {
- ll = opt[cur].litlen;
- price = ((cur > ll) ? opt[cur - ll].price : 0)
- + LZ4HC_sequencePrice(ll, ml);
- } else {
- ll = 0;
- price = opt[cur].price + LZ4HC_sequencePrice(0, ml);
- }
-
- assert((U32)favorDecSpeed <= 1);
- if (pos > last_match_pos+TRAILING_LITERALS
- || price <= opt[pos].price - (int)favorDecSpeed) {
- DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i)",
- pos, price, ml);
- assert(pos < LZ4_OPT_NUM);
- if ( (ml == matchML) /* last pos of last match */
- && (last_match_pos < pos) )
- last_match_pos = pos;
- opt[pos].mlen = ml;
- opt[pos].off = offset;
- opt[pos].litlen = ll;
- opt[pos].price = price;
- } } }
- /* complete following positions with literals */
- { int addLit;
- for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
- opt[last_match_pos+addLit].mlen = 1; /* literal */
- opt[last_match_pos+addLit].off = 0;
- opt[last_match_pos+addLit].litlen = addLit;
- opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
- DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)", last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
- } }
- } /* for (cur = 1; cur <= last_match_pos; cur++) */
-
- assert(last_match_pos < LZ4_OPT_NUM + TRAILING_LITERALS);
- best_mlen = opt[last_match_pos].mlen;
- best_off = opt[last_match_pos].off;
- cur = last_match_pos - best_mlen;
-
+ continue;
+ }
+
+ /* set prices for first positions (literals) */
+ { int rPos;
+ for (rPos = 0 ; rPos < MINMATCH ; rPos++) {
+ int const cost = LZ4HC_literalsPrice(llen + rPos);
+ opt[rPos].mlen = 1;
+ opt[rPos].off = 0;
+ opt[rPos].litlen = llen + rPos;
+ opt[rPos].price = cost;
+ DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
+ rPos, cost, opt[rPos].litlen);
+ } }
+ /* set prices using initial match */
+ { int mlen = MINMATCH;
+ int const matchML = firstMatch.len; /* necessarily < sufficient_len < LZ4_OPT_NUM */
+ int const offset = firstMatch.off;
+ assert(matchML < LZ4_OPT_NUM);
+ for ( ; mlen <= matchML ; mlen++) {
+ int const cost = LZ4HC_sequencePrice(llen, mlen);
+ opt[mlen].mlen = mlen;
+ opt[mlen].off = offset;
+ opt[mlen].litlen = llen;
+ opt[mlen].price = cost;
+ DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i) -- initial setup",
+ mlen, cost, mlen);
+ } }
+ last_match_pos = firstMatch.len;
+ { int addLit;
+ for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
+ opt[last_match_pos+addLit].mlen = 1; /* literal */
+ opt[last_match_pos+addLit].off = 0;
+ opt[last_match_pos+addLit].litlen = addLit;
+ opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
+ DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i) -- initial setup",
+ last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
+ } }
+
+ /* check further positions */
+ for (cur = 1; cur < last_match_pos; cur++) {
+ const BYTE* const curPtr = ip + cur;
+ LZ4HC_match_t newMatch;
+
+ if (curPtr > mflimit) break;
+ DEBUGLOG(7, "rPos:%u[%u] vs [%u]%u",
+ cur, opt[cur].price, opt[cur+1].price, cur+1);
+ if (fullUpdate) {
+ /* not useful to search here if next position has same (or lower) cost */
+ if ( (opt[cur+1].price <= opt[cur].price)
+ /* in some cases, next position has same cost, but cost rises sharply after, so a small match would still be beneficial */
+ && (opt[cur+MINMATCH].price < opt[cur].price + 3/*min seq price*/) )
+ continue;
+ } else {
+ /* not useful to search here if next position has same (or lower) cost */
+ if (opt[cur+1].price <= opt[cur].price) continue;
+ }
+
+ DEBUGLOG(7, "search at rPos:%u", cur);
+ if (fullUpdate)
+ newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, MINMATCH-1, nbSearches, dict, favorDecSpeed);
+ else
+ /* only test matches of minimum length; slightly faster, but misses a few bytes */
+ newMatch = LZ4HC_FindLongerMatch(ctx, curPtr, matchlimit, last_match_pos - cur, nbSearches, dict, favorDecSpeed);
+ if (!newMatch.len) continue;
+
+ if ( ((size_t)newMatch.len > sufficient_len)
+ || (newMatch.len + cur >= LZ4_OPT_NUM) ) {
+ /* immediate encoding */
+ best_mlen = newMatch.len;
+ best_off = newMatch.off;
+ last_match_pos = cur + 1;
+ goto encode;
+ }
+
+ /* before match : set price with literals at beginning */
+ { int const baseLitlen = opt[cur].litlen;
+ int litlen;
+ for (litlen = 1; litlen < MINMATCH; litlen++) {
+ int const price = opt[cur].price - LZ4HC_literalsPrice(baseLitlen) + LZ4HC_literalsPrice(baseLitlen+litlen);
+ int const pos = cur + litlen;
+ if (price < opt[pos].price) {
+ opt[pos].mlen = 1; /* literal */
+ opt[pos].off = 0;
+ opt[pos].litlen = baseLitlen+litlen;
+ opt[pos].price = price;
+ DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)",
+ pos, price, opt[pos].litlen);
+ } } }
+
+ /* set prices using match at position = cur */
+ { int const matchML = newMatch.len;
+ int ml = MINMATCH;
+
+ assert(cur + newMatch.len < LZ4_OPT_NUM);
+ for ( ; ml <= matchML ; ml++) {
+ int const pos = cur + ml;
+ int const offset = newMatch.off;
+ int price;
+ int ll;
+ DEBUGLOG(7, "testing price rPos %i (last_match_pos=%i)",
+ pos, last_match_pos);
+ if (opt[cur].mlen == 1) {
+ ll = opt[cur].litlen;
+ price = ((cur > ll) ? opt[cur - ll].price : 0)
+ + LZ4HC_sequencePrice(ll, ml);
+ } else {
+ ll = 0;
+ price = opt[cur].price + LZ4HC_sequencePrice(0, ml);
+ }
+
+ assert((U32)favorDecSpeed <= 1);
+ if (pos > last_match_pos+TRAILING_LITERALS
+ || price <= opt[pos].price - (int)favorDecSpeed) {
+ DEBUGLOG(7, "rPos:%3i => price:%3i (matchlen=%i)",
+ pos, price, ml);
+ assert(pos < LZ4_OPT_NUM);
+ if ( (ml == matchML) /* last pos of last match */
+ && (last_match_pos < pos) )
+ last_match_pos = pos;
+ opt[pos].mlen = ml;
+ opt[pos].off = offset;
+ opt[pos].litlen = ll;
+ opt[pos].price = price;
+ } } }
+ /* complete following positions with literals */
+ { int addLit;
+ for (addLit = 1; addLit <= TRAILING_LITERALS; addLit ++) {
+ opt[last_match_pos+addLit].mlen = 1; /* literal */
+ opt[last_match_pos+addLit].off = 0;
+ opt[last_match_pos+addLit].litlen = addLit;
+ opt[last_match_pos+addLit].price = opt[last_match_pos].price + LZ4HC_literalsPrice(addLit);
+ DEBUGLOG(7, "rPos:%3i => price:%3i (litlen=%i)", last_match_pos+addLit, opt[last_match_pos+addLit].price, addLit);
+ } }
+ } /* for (cur = 1; cur <= last_match_pos; cur++) */
+
+ assert(last_match_pos < LZ4_OPT_NUM + TRAILING_LITERALS);
+ best_mlen = opt[last_match_pos].mlen;
+ best_off = opt[last_match_pos].off;
+ cur = last_match_pos - best_mlen;
+
encode: /* cur, last_match_pos, best_mlen, best_off must be set */
- assert(cur < LZ4_OPT_NUM);
- assert(last_match_pos >= 1); /* == 1 when only one candidate */
- DEBUGLOG(6, "reverse traversal, looking for shortest path (last_match_pos=%i)", last_match_pos);
- { int candidate_pos = cur;
- int selected_matchLength = best_mlen;
- int selected_offset = best_off;
- while (1) { /* from end to beginning */
- int const next_matchLength = opt[candidate_pos].mlen; /* can be 1, means literal */
- int const next_offset = opt[candidate_pos].off;
- DEBUGLOG(7, "pos %i: sequence length %i", candidate_pos, selected_matchLength);
- opt[candidate_pos].mlen = selected_matchLength;
- opt[candidate_pos].off = selected_offset;
- selected_matchLength = next_matchLength;
- selected_offset = next_offset;
- if (next_matchLength > candidate_pos) break; /* last match elected, first match to encode */
- assert(next_matchLength > 0); /* can be 1, means literal */
- candidate_pos -= next_matchLength;
- } }
-
- /* encode all recorded sequences in order */
- { int rPos = 0; /* relative position (to ip) */
- while (rPos < last_match_pos) {
- int const ml = opt[rPos].mlen;
- int const offset = opt[rPos].off;
- if (ml == 1) { ip++; rPos++; continue; } /* literal; note: can end up with several literals, in which case, skip them */
- rPos += ml;
- assert(ml >= MINMATCH);
- assert((offset >= 1) && (offset <= LZ4_DISTANCE_MAX));
- opSaved = op;
+ assert(cur < LZ4_OPT_NUM);
+ assert(last_match_pos >= 1); /* == 1 when only one candidate */
+ DEBUGLOG(6, "reverse traversal, looking for shortest path (last_match_pos=%i)", last_match_pos);
+ { int candidate_pos = cur;
+ int selected_matchLength = best_mlen;
+ int selected_offset = best_off;
+ while (1) { /* from end to beginning */
+ int const next_matchLength = opt[candidate_pos].mlen; /* can be 1, means literal */
+ int const next_offset = opt[candidate_pos].off;
+ DEBUGLOG(7, "pos %i: sequence length %i", candidate_pos, selected_matchLength);
+ opt[candidate_pos].mlen = selected_matchLength;
+ opt[candidate_pos].off = selected_offset;
+ selected_matchLength = next_matchLength;
+ selected_offset = next_offset;
+ if (next_matchLength > candidate_pos) break; /* last match elected, first match to encode */
+ assert(next_matchLength > 0); /* can be 1, means literal */
+ candidate_pos -= next_matchLength;
+ } }
+
+ /* encode all recorded sequences in order */
+ { int rPos = 0; /* relative position (to ip) */
+ while (rPos < last_match_pos) {
+ int const ml = opt[rPos].mlen;
+ int const offset = opt[rPos].off;
+ if (ml == 1) { ip++; rPos++; continue; } /* literal; note: can end up with several literals, in which case, skip them */
+ rPos += ml;
+ assert(ml >= MINMATCH);
+ assert((offset >= 1) && (offset <= LZ4_DISTANCE_MAX));
+ opSaved = op;
if ( LZ4HC_encodeSequence(UPDATABLE(ip, op, anchor), ml, ip - offset, limit, oend) ) { /* updates ip, op and anchor */
ovml = ml;
ovref = ip - offset;
- goto _dest_overflow;
+ goto _dest_overflow;
} } }
- } /* while (ip <= mflimit) */
-
+ } /* while (ip <= mflimit) */
+
_last_literals:
- /* Encode Last Literals */
- { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
+ /* Encode Last Literals */
+ { size_t lastRunSize = (size_t)(iend - anchor); /* literals */
size_t llAdd = (lastRunSize + 255 - RUN_MASK) / 255;
size_t const totalSize = 1 + llAdd + lastRunSize;
- if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
- if (limit && (op + totalSize > oend)) {
+ if (limit == fillOutput) oend += LASTLITERALS; /* restore correct value */
+ if (limit && (op + totalSize > oend)) {
if (limit == limitedOutput) { /* Check output limit */
retval = 0;
goto _return_label;
}
- /* adapt lastRunSize to fill 'dst' */
+ /* adapt lastRunSize to fill 'dst' */
lastRunSize = (size_t)(oend - op) - 1 /*token*/;
llAdd = (lastRunSize + 256 - RUN_MASK) / 256;
lastRunSize -= llAdd;
- }
+ }
DEBUGLOG(6, "Final literal run : %i literals", (int)lastRunSize);
ip = anchor + lastRunSize; /* can be != iend if limit==fillOutput */
-
- if (lastRunSize >= RUN_MASK) {
- size_t accumulator = lastRunSize - RUN_MASK;
- *op++ = (RUN_MASK << ML_BITS);
- for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
- *op++ = (BYTE) accumulator;
- } else {
- *op++ = (BYTE)(lastRunSize << ML_BITS);
- }
- memcpy(op, anchor, lastRunSize);
- op += lastRunSize;
- }
-
- /* End */
- *srcSizePtr = (int) (((const char*)ip) - source);
+
+ if (lastRunSize >= RUN_MASK) {
+ size_t accumulator = lastRunSize - RUN_MASK;
+ *op++ = (RUN_MASK << ML_BITS);
+ for(; accumulator >= 255 ; accumulator -= 255) *op++ = 255;
+ *op++ = (BYTE) accumulator;
+ } else {
+ *op++ = (BYTE)(lastRunSize << ML_BITS);
+ }
+ memcpy(op, anchor, lastRunSize);
+ op += lastRunSize;
+ }
+
+ /* End */
+ *srcSizePtr = (int) (((const char*)ip) - source);
retval = (int) ((char*)op-dst);
goto _return_label;
-
+
_dest_overflow:
if (limit == fillOutput) {
/* Assumption : ip, anchor, ovml and ovref must be set correctly */