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Code Issues Releases 1 Activity

[lib] Fix lazy parser with dictionary + repcodes

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This commit is contained in:
Nick Terrell 2020-05-11 19:04:30 -07:00
parent 1185dfb8d1
commit 80d3585e31
1 changed files with 9 additions and 4 deletions
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13
lib/compress/zstd_lazy.c
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@ -951,12 +951,13 @@ size_t ZSTD_compressBlock_lazy_extDict_generic(
size_t offset=0;
const BYTE* start=ip+1;
U32 current = (U32)(ip-base);
U32 windowLow = ZSTD_getLowestMatchIndex(ms, current, ms->cParams.windowLog);
/* check repCode */
{ const U32 repIndex = (U32)(current+1 - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
if (MEM_read32(ip+1) == MEM_read32(repMatch)) {
/* repcode detected we should take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
@ -981,12 +982,14 @@ size_t ZSTD_compressBlock_lazy_extDict_generic(
while (ip<ilimit) {
ip ++;
current++;
windowLow = ZSTD_getLowestMatchIndex(ms, current, ms->cParams.windowLog);
/* check repCode */
if (offset) {
const U32 repIndex = (U32)(current - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
windowLow = ZSTD_getLowestMatchIndex(ms, current, ms->cParams.windowLog);
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
if (MEM_read32(ip) == MEM_read32(repMatch)) {
/* repcode detected */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
@ -1011,12 +1014,13 @@ size_t ZSTD_compressBlock_lazy_extDict_generic(
if ((depth==2) && (ip<ilimit)) {
ip ++;
current++;
windowLow = ZSTD_getLowestMatchIndex(ms, current, ms->cParams.windowLog);
/* check repCode */
if (offset) {
const U32 repIndex = (U32)(current - offset_1);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
if (MEM_read32(ip) == MEM_read32(repMatch)) {
/* repcode detected */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
@ -1060,7 +1064,8 @@ _storeSequence:
const U32 repIndex = (U32)((ip-base) - offset_2);
const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
const BYTE* const repMatch = repBase + repIndex;
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > lowestIndex)) /* intentional overflow */
windowLow = ZSTD_getLowestMatchIndex(ms, current, ms->cParams.windowLog);
if (((U32)((dictLimit-1) - repIndex) >= 3) & (repIndex > windowLow)) /* intentional overflow */
if (MEM_read32(ip) == MEM_read32(repMatch)) {
/* repcode detected we should take it */
const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;