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Add ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG

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This macro forces behavior in the opposite direction.
This commit is contained in:
W. Felix Handte 2018-12-03 17:36:24 -08:00
parent 64553a0e35
commit 4bbb8a48ad
1 changed files with 26 additions and 3 deletions
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29
lib/decompress/zstd_decompress_block.c
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@ -27,6 +27,18 @@
#include "zstd_ddict.h" /* ZSTD_DDictDictContent */ #include "zstd_ddict.h" /* ZSTD_DDictDictContent */
#include "zstd_decompress_block.h" #include "zstd_decompress_block.h"
/*_*******************************************************
* Macros
**********************************************************/
/* These two optional macros force the use one way or another of the two
* ZSTD_decompressSequences implementations. You can't force in both directions
* at the same time.
*/
#if defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
#error "Cannot force the use of the short and the long ZSTD_decompressSequences variants!"
#endif
/*_******************************************************* /*_*******************************************************
@ -1202,7 +1214,12 @@ ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
/* Build Decoding Tables */ /* Build Decoding Tables */
{ {
#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT /* These macros control at build-time which decompressor implementation
* we use. If neither is defined, we do some inspection and dispatch at
* runtime.
*/
#if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
!defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
int usePrefetchDecoder = dctx->ddictIsCold; int usePrefetchDecoder = dctx->ddictIsCold;
#endif #endif
int nbSeq; int nbSeq;
@ -1211,7 +1228,8 @@ ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
ip += seqHSize; ip += seqHSize;
srcSize -= seqHSize; srcSize -= seqHSize;
#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
!defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
if ( !usePrefetchDecoder if ( !usePrefetchDecoder
&& (!frame || (dctx->fParams.windowSize > (1<<24))) && (!frame || (dctx->fParams.windowSize > (1<<24)))
&& (nbSeq>ADVANCED_SEQS) ) { /* could probably use a larger nbSeq limit */ && (nbSeq>ADVANCED_SEQS) ) { /* could probably use a larger nbSeq limit */
@ -1223,13 +1241,18 @@ ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
dctx->ddictIsCold = 0; dctx->ddictIsCold = 0;
#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
!defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
if (usePrefetchDecoder) if (usePrefetchDecoder)
#endif
#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT
return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset); return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
#endif #endif
#ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG
/* else */ /* else */
return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset); return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
#endif
} }
} }