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Added : ZSTD decompression : ability to resist to noisy/faulty data source

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Yann Collet
2015-08-23 23:13:49 +01:00
parent cf5ce55cca
commit d5d9bc3f82
7 changed files with 68 additions and 68 deletions
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lib/zstd.c
+6 -3
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@@ -1414,7 +1414,7 @@ static size_t ZSTD_execSequence(BYTE* op,
const BYTE** litPtr, const BYTE* const litLimit,
BYTE* const base, BYTE* const oend)
{
static const int dec32table[] = {4, 1, 2, 1, 4, 4, 4, 4}; /* added */
static const int dec32table[] = {0, 1, 2, 1, 4, 4, 4, 4}; /* added */
static const int dec64table[] = {8, 8, 8, 7, 8, 9,10,11}; /* substracted */
const BYTE* const ostart = op;
const size_t litLength = sequence.litLength;
@@ -1422,8 +1422,9 @@ static size_t ZSTD_execSequence(BYTE* op,
const BYTE* const litEnd = *litPtr + litLength;
/* check */
if (endMatch > oend) return (size_t)-ZSTD_ERROR_maxDstSize_tooSmall;
if (endMatch > oend) return (size_t)-ZSTD_ERROR_maxDstSize_tooSmall; /* overwrite beyond dst buffer */
if (litEnd > litLimit) return (size_t)-ZSTD_ERROR_corruption;
if (sequence.matchLength > (size_t)(*litPtr-op)) return (size_t)-ZSTD_ERROR_maxDstSize_tooSmall; /* overwrite literal segment */
/* copy Literals */
if (((size_t)(*litPtr - op) < 8) || ((size_t)(oend-litEnd) < 8) || (op+litLength > oend-8))
@@ -1536,7 +1537,9 @@ static size_t ZSTD_decompressSequences(
memset(&sequence, 0, sizeof(sequence));
seqState.dumps = dumps;
FSE_initDStream(&(seqState.DStream), ip, iend-ip);
seqState.prevOffset = 1;
errorCode = FSE_initDStream(&(seqState.DStream), ip, iend-ip);
if (FSE_isError(errorCode)) return (size_t)-ZSTD_ERROR_corruption;
FSE_initDState(&(seqState.stateLL), &(seqState.DStream), DTableLL);
FSE_initDState(&(seqState.stateOffb), &(seqState.DStream), DTableOffb);
FSE_initDState(&(seqState.stateML), &(seqState.DStream), DTableML);