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added minimum for decoder buffer

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also : introduced macro BOUNDED()
This commit is contained in:
Yann Collet 2021-10-26 08:21:31 -07:00
parent 02be2a830f
commit 518f06b281
5 changed files with 8 additions and 6 deletions
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1
lib/common/zstd_internal.h
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@ -57,6 +57,7 @@ extern "C" {
#undef MAX
#define MIN(a,b) ((a)<(b) ? (a) : (b))
#define MAX(a,b) ((a)>(b) ? (a) : (b))
#define BOUNDED(min,val,max) (MAX(min,MIN(val,max)))
/*-*************************************

4
lib/compress/zstd_compress.c
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@ -1465,7 +1465,7 @@ static size_t ZSTD_estimateCCtxSize_usingCCtxParams_internal(
const size_t buffOutSize,
const U64 pledgedSrcSize)
{
size_t const windowSize = MAX(1, (size_t)MIN(((U64)1 << cParams->windowLog), pledgedSrcSize));
size_t const windowSize = BOUNDED(1, 1 << cParams->windowLog, pledgedSrcSize);
size_t const blockSize = MIN(ZSTD_BLOCKSIZE_MAX, windowSize);
U32 const divider = (cParams->minMatch==3) ? 3 : 4;
size_t const maxNbSeq = blockSize / divider;
@ -1783,7 +1783,7 @@ ZSTD_reset_matchState(ZSTD_matchState_t* ms,
if (ms->tagTable) ZSTD_memset(ms->tagTable, 0, tagTableSize);
}
{ /* Switch to 32-entry rows if searchLog is 5 (or more) */
U32 const rowLog = MAX(MIN(cParams->searchLog, 6), 4);
U32 const rowLog = BOUNDED(4, cParams->searchLog, 6);
assert(cParams->hashLog >= rowLog);
ms->rowHashLog = cParams->hashLog - rowLog;
}

2
lib/compress/zstd_lazy.c
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@ -1086,7 +1086,7 @@ FORCE_INLINE_TEMPLATE void ZSTD_row_update_internal(ZSTD_matchState_t* ms, const
* processing.
*/
void ZSTD_row_update(ZSTD_matchState_t* const ms, const BYTE* ip) {
const U32 rowLog = MAX(MIN(ms->cParams.searchLog, 6), 4);
const U32 rowLog = BOUNDED(4, ms->cParams.searchLog, 6);
const U32 rowMask = (1u << rowLog) - 1;
const U32 mls = MIN(ms->cParams.minMatch, 6 /* mls caps out at 6 */);

2
lib/decompress/zstd_decompress.c
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@ -1123,7 +1123,7 @@ static size_t ZSTD_nextSrcSizeToDecompressWithInputSize(ZSTD_DCtx* dctx, size_t
return dctx->expected;
if (dctx->bType != bt_raw)
return dctx->expected;
return MIN(MAX(inputSize, 1), dctx->expected);
return BOUNDED(1, inputSize, dctx->expected);
}
ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {

5
lib/decompress/zstd_decompress_internal.h
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@ -110,10 +110,11 @@ typedef struct {
# define ZSTD_DECODER_INTERNAL_BUFFER (1 << 16)
#endif
#define ZSTD_LBMIN 64
#define ZSTD_LBMAX (128 << 10)
/* extra buffer, compensates amount of dst required to store litBuffer */
#define ZSTD_LITBUFFEREXTRASIZE MIN(ZSTD_DECODER_INTERNAL_BUFFER, ZSTD_LBMAX)
/* extra buffer, compensates when dst is not large enough to store litBuffer */
#define ZSTD_LITBUFFEREXTRASIZE BOUNDED(ZSTD_LBMIN, ZSTD_DECODER_INTERNAL_BUFFER, ZSTD_LBMAX)
typedef enum {
ZSTD_not_in_dst = 0, /* Stored entirely within litExtraBuffer */