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* Improve overall randomness. Now even close seeds have very different

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behaviours on which bits are flipped.
This commit is contained in:
Sam Hocevar
2008-05-16 22:01:07 +00:00
committed by sam
parent 60a67d3282
commit cee4f2fc92
1 changed files with 10 additions and 2 deletions
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src/fuzz.c
+10 -2
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@@ -36,6 +36,7 @@
#define MAGIC1 0x33ea84f7
#define MAGIC2 0x783bc31f
#define MAGIC3 0x9b5da2fb
/* Fuzzing mode */
static enum fuzzing
@@ -105,8 +106,15 @@ void _zz_fuzz(int fd, volatile uint8_t *buf, int64_t len)
/* Cache bitmask array */
if(fuzz->cur != (int)i)
{
uint32_t chunkseed = ((int)i + (int)(fuzz->ratio * MAGIC1)) ^ MAGIC2;
_zz_srand(fuzz->seed ^ chunkseed);
uint32_t chunkseed;
chunkseed = (uint32_t)i;
chunkseed ^= MAGIC2;
chunkseed += (uint32_t)(fuzz->ratio * MAGIC1);
chunkseed ^= fuzz->seed;
chunkseed += (uint32_t)(i * MAGIC3);
_zz_srand(chunkseed);
memset(fuzz->data, 0, CHUNKBYTES);