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fixed round-trip corruption, reported by Oliver Lange

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This commit is contained in:
Yann Collet 2016-04-11 16:25:56 +02:00
parent 125d81774f
commit 582933fde5
2 changed files with 12 additions and 2 deletions
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4
lib/zstd_compress.c
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@ -818,7 +818,7 @@ size_t ZSTD_compressSequences(ZSTD_CCtx* zc,
FSE_encodeSymbol(&blockStream, &stateMatchLength, mlCode); /* 24 */ /* 24 */
if (MEM_32bits()) BIT_flushBits(&blockStream); /* (7)*/
FSE_encodeSymbol(&blockStream, &stateLitLength, llCode); /* 16 */ /* 33 */
if (MEM_32bits() || (ofBits+mlBits+llBits > 64-7-(LLFSELog+MLFSELog+OffFSELog)))
if (MEM_32bits() || (ofBits+mlBits+llBits >= 64-7-(LLFSELog+MLFSELog+OffFSELog)))
BIT_flushBits(&blockStream); /* (7)*/
BIT_addBits(&blockStream, llTable[n], llBits);
if (MEM_32bits() && ((llBits+mlBits)>24)) BIT_flushBits(&blockStream);
@ -858,7 +858,7 @@ MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const B
static const BYTE* g_start = NULL;
const U32 pos = (U32)(literals - g_start);
if (g_start==NULL) g_start = literals;
if ((pos > 200000000) && (pos < 200900000))
if ((pos > 5810300) && (pos < 5810500))
printf("Cpos %6u :%5u literals & match %3u bytes at distance %6u \n",
pos, (U32)litLength, (U32)matchCode+MINMATCH, (U32)offsetCode);
#endif

10
lib/zstd_decompress.c
View File

@ -786,6 +786,16 @@ static size_t ZSTD_decompressSequences(
for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && nbSeq ; ) {
nbSeq--;
ZSTD_decodeSequence(&sequence, &seqState);
#if 0 /* debug */
static BYTE* start = NULL;
if (start==NULL) start = op;
size_t pos = (size_t)(op-start);
if ((pos >= 5810037) && (pos < 5810400))
printf("Dpos %6u :%5u literals & match %3u bytes at distance %6u \n",
pos, (U32)sequence.litLength, (U32)sequence.matchLength, (U32)sequence.offset);
#endif
{ size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litLimit_8, base, vBase, dictEnd);
if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
op += oneSeqSize;