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when ll=0 offset 3 becomes rep[0]-1 : in ZSTD_compressBlock_opt_extDict_generic

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inikep
2016-08-01 16:00:24 +02:00
parent bd32aff957
commit 050909de29
1 changed files with 10 additions and 9 deletions
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lib/compress/zstd_opt.h
+10 -9
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@@ -748,12 +748,13 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
opt[0].litlen = (U32)(ip - anchor);
/* check repCode */
{ U32 i;
for (i = (ip==anchor); i<ZSTD_REP_CHECK; i++) {
const U32 repIndex = (U32)(current - rep[i]);
{ U32 i, last_i = ZSTD_REP_CHECK + (ip==anchor);
for (i = (ip==anchor); i<last_i; i++) {
const S32 repCur = ((i==ZSTD_REP_MOVE_OPT) && (ip==anchor)) ? (rep[0] - 1) : rep[i];
const U32 repIndex = (U32)(current - repCur);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( (rep[i] <= current)
if ( (repCur > 0 && repCur <= (S32)current)
&& (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex>lowestIndex)) /* intentional overflow */
&& (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) {
/* repcode detected we should take it */
@@ -844,20 +845,20 @@ void ZSTD_compressBlock_opt_extDict_generic(ZSTD_CCtx* ctx,
} else {
opt[cur].rep[2] = (opt[cur].off > 1) ? opt[cur-mlen].rep[1] : opt[cur-mlen].rep[2];
opt[cur].rep[1] = (opt[cur].off > 0) ? opt[cur-mlen].rep[0] : opt[cur-mlen].rep[1];
opt[cur].rep[0] = ((opt[cur].off==3) && (mlen != 1)) ? (opt[cur-mlen].rep[0] - 1) : (opt[cur-mlen].rep[opt[cur].off]);
opt[cur].rep[0] = ((opt[cur].off==ZSTD_REP_MOVE_OPT) && (mlen != 1)) ? (opt[cur-mlen].rep[0] - 1) : (opt[cur-mlen].rep[opt[cur].off]);
ZSTD_LOG_ENCODE("%d: COPYREP_NOR cur=%d mlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, mlen, opt[cur].rep[0], opt[cur].rep[1]);
}
ZSTD_LOG_PARSER("%d: CURRENT_Ext price[%d/%d]=%d off=%d mlen=%d litlen=%d rep[0]=%d rep[1]=%d\n", (int)(inr-base), cur, last_pos, opt[cur].price, opt[cur].off, opt[cur].mlen, opt[cur].litlen, opt[cur].rep[0], opt[cur].rep[1]);
best_mlen = 0;
{ U32 i, last_i = ZSTD_REP_CHECK; //+(mlen != 1);
{ U32 i, last_i = ZSTD_REP_CHECK + (mlen != 1);
for (i = (mlen != 1); i<last_i; i++) {
const U32 repCur = ((i==3) && (opt[cur].mlen != 1)) ? (opt[cur].rep[0]-1) : (opt[cur].rep[i]);
const S32 repCur = ((i==ZSTD_REP_MOVE_OPT) && (opt[cur].mlen != 1)) ? (opt[cur].rep[0] - 1) : opt[cur].rep[i];
const U32 repIndex = (U32)(current+cur - repCur);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if ( (repCur > 0 && repCur <= current+cur)
if ( (repCur > 0 && repCur <= (S32)(current+cur))
&& (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex>lowestIndex)) /* intentional overflow */
&& (MEM_readMINMATCH(inr, minMatch) == MEM_readMINMATCH(repMatch, minMatch)) ) {
/* repcode detected */
@@ -974,7 +975,7 @@ _storeSequence: /* cur, last_pos, best_mlen, best_off have to be set */
offset--;
} else {
if (offset != 0) {
best_off = ((offset==3) && (litLength==0)) ? (rep[0] - 1) : (rep[offset]);
best_off = ((offset==ZSTD_REP_MOVE_OPT) && (litLength==0)) ? (rep[0] - 1) : (rep[offset]);
if (offset != 1) rep[2] = rep[1];
rep[1] = rep[0];
rep[0] = best_off;