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Further Consolidate Dict Mode Checks

dev
W. Felix Handte 2020-09-10 18:18:50 -04:00
parent 032010fcc1
commit 85a95840e4
1 changed files with 12 additions and 15 deletions
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27
lib/compress/zstd_lazy.c
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@ -896,16 +896,13 @@ ZSTD_compressBlock_lazy_generic(
const int isDMS = dictMode == ZSTD_dictMatchState;
const int isDDS = dictMode == ZSTD_dedicatedDictSearch;
const int isDxS = isDMS || isDDS;
const ZSTD_matchState_t* const dms = ms->dictMatchState;
const U32 dictLowestIndex = isDMS || isDDS ?
dms->window.dictLimit : 0;
const BYTE* const dictBase = isDMS || isDDS ?
dms->window.base : NULL;
const BYTE* const dictLowest = isDMS || isDDS ?
dictBase + dictLowestIndex : NULL;
const BYTE* const dictEnd = isDMS || isDDS ?
dms->window.nextSrc : NULL;
const U32 dictIndexDelta = isDMS || isDDS ?
const U32 dictLowestIndex = isDxS ? dms->window.dictLimit : 0;
const BYTE* const dictBase = isDxS ? dms->window.base : NULL;
const BYTE* const dictLowest = isDxS ? dictBase + dictLowestIndex : NULL;
const BYTE* const dictEnd = isDxS ? dms->window.nextSrc : NULL;
const U32 dictIndexDelta = isDxS ?
prefixLowestIndex - (U32)(dictEnd - dictBase) :
0;
const U32 dictAndPrefixLength = (U32)((ip - prefixLowest) + (dictEnd - dictLowest));
@ -923,7 +920,7 @@ ZSTD_compressBlock_lazy_generic(
if (offset_2 > maxRep) savedOffset = offset_2, offset_2 = 0;
if (offset_1 > maxRep) savedOffset = offset_1, offset_1 = 0;
}
if (isDMS || isDDS) {
if (isDxS) {
/* dictMatchState repCode checks don't currently handle repCode == 0
* disabling. */
assert(offset_1 <= dictAndPrefixLength);
@ -943,7 +940,7 @@ ZSTD_compressBlock_lazy_generic(
const BYTE* start=ip+1;
/* check repCode */
if (isDMS || isDDS) {
if (isDxS) {
const U32 repIndex = (U32)(ip - base) + 1 - offset_1;
const BYTE* repMatch = ((dictMode == ZSTD_dictMatchState || dictMode == ZSTD_dedicatedDictSearch)
&& repIndex < prefixLowestIndex) ?
@ -986,7 +983,7 @@ ZSTD_compressBlock_lazy_generic(
if ((mlRep >= 4) && (gain2 > gain1))
matchLength = mlRep, offset = 0, start = ip;
}
if (isDMS || isDDS) {
if (isDxS) {
const U32 repIndex = (U32)(ip - base) - offset_1;
const BYTE* repMatch = repIndex < prefixLowestIndex ?
dictBase + (repIndex - dictIndexDelta) :
@ -1021,7 +1018,7 @@ ZSTD_compressBlock_lazy_generic(
if ((mlRep >= 4) && (gain2 > gain1))
matchLength = mlRep, offset = 0, start = ip;
}
if (isDMS || isDDS) {
if (isDxS) {
const U32 repIndex = (U32)(ip - base) - offset_1;
const BYTE* repMatch = repIndex < prefixLowestIndex ?
dictBase + (repIndex - dictIndexDelta) :
@ -1059,7 +1056,7 @@ ZSTD_compressBlock_lazy_generic(
&& (start[-1] == (start-(offset-ZSTD_REP_MOVE))[-1]) ) /* only search for offset within prefix */
{ start--; matchLength++; }
}
if (isDMS || isDDS) {
if (isDxS) {
U32 const matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE));
const BYTE* match = (matchIndex < prefixLowestIndex) ? dictBase + matchIndex - dictIndexDelta : base + matchIndex;
const BYTE* const mStart = (matchIndex < prefixLowestIndex) ? dictLowest : prefixLowest;
@ -1075,7 +1072,7 @@ _storeSequence:
}
/* check immediate repcode */
if (isDMS || isDDS) {
if (isDxS) {
while (ip <= ilimit) {
U32 const current2 = (U32)(ip-base);
U32 const repIndex = current2 - offset_2;