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roundTripCrash automatic compression level now depends on first 128 bytes

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This commit is contained in:
Yann Collet 2016-06-20 16:18:19 +02:00
parent e4811ba761
commit cbf8c52954
1 changed files with 9 additions and 1 deletions
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10
programs/roundTripCrash.c
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@ -36,8 +36,14 @@
#include <stdio.h> /* fprintf */ #include <stdio.h> /* fprintf */
#include <sys/types.h> /* stat */ #include <sys/types.h> /* stat */
#include <sys/stat.h> /* stat */ #include <sys/stat.h> /* stat */
#include "xxhash.h"
#include "zstd.h" #include "zstd.h"
/*===========================================
* Macros
*==========================================*/
#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
/** roundTripTest() : /** roundTripTest() :
* Compresses `srcBuff` into `compressedBuff`, * Compresses `srcBuff` into `compressedBuff`,
* then decompresses `compressedBuff` into `resultBuff`. * then decompresses `compressedBuff` into `resultBuff`.
@ -51,7 +57,9 @@ static size_t roundTripTest(void* resultBuff, size_t resultBuffCapacity,
const void* srcBuff, size_t srcBuffSize) const void* srcBuff, size_t srcBuffSize)
{ {
static const int maxClevel = 19; static const int maxClevel = 19;
int const cLevel = (!srcBuffSize) ? 1 : (*(const unsigned char*)srcBuff) % maxClevel; size_t const hashLength = MIN(128, srcBuffSize);
unsigned const h32 = XXH32(srcBuff, hashLength, 0);
int const cLevel = h32 % maxClevel;
size_t const cSize = ZSTD_compress(compressedBuff, compressedBuffCapacity, srcBuff, srcBuffSize, cLevel); size_t const cSize = ZSTD_compress(compressedBuff, compressedBuffCapacity, srcBuff, srcBuffSize, cLevel);
if (ZSTD_isError(cSize)) { if (ZSTD_isError(cSize)) {
fprintf(stderr, "Compression error : %s \n", ZSTD_getErrorName(cSize)); fprintf(stderr, "Compression error : %s \n", ZSTD_getErrorName(cSize));