DeforaNetworks/zzuf
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* Really fix the inconsistency bug. Now dd bs=2048 count=1 gives the same

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result as dd bs=1 count=2048.
This commit is contained in:
Sam Hocevar 2006-12-15 14:07:46 +00:00 committed by sam
parent 22c8111a5a
commit f8fcc918b8
1 changed files with 9 additions and 11 deletions
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20
src/fuzz.c
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@ -37,34 +37,32 @@
void zzuf_fuzz(int fd, uint8_t *buf, uint64_t len)
{
uint8_t bits[CHUNK_SIZE];
uint64_t pos, offset;
uint64_t pos;
unsigned int i;
pos = files[fd].pos;
offset = pos % CHUNK_SIZE;
for(i = pos / CHUNK_SIZE; i < (pos + len) / CHUNK_SIZE + 1; i++)
for(i = pos / CHUNK_SIZE;
i < (pos + len + CHUNK_SIZE - 1) / CHUNK_SIZE;
i++)
{
int todo;
/* Add some random dithering to handle percent < 1.0/CHUNK_SIZE */
zzuf_srand(_zzuf_seed ^ (i * 0x23ea84f7));
zzuf_srand(_zzuf_seed ^ (i * 0x33ea84f7));
todo = (int)((_zzuf_percent * CHUNK_SIZE + zzuf_rand(100)) / 100.0);
zzuf_srand(_zzuf_seed ^ (i * 0x23ea84f7) ^ (todo * 0x783bc31f));
zzuf_srand(_zzuf_seed ^ (i * 0x7f48ae33) ^ (todo * 0x783bc31f));
memset(bits, 0, CHUNK_SIZE);
while(todo--)
{
int idx = zzuf_rand(CHUNK_SIZE);
uint64_t idx = i * CHUNK_SIZE + zzuf_rand(CHUNK_SIZE);
uint8_t byte = (1 << zzuf_rand(8));
if(i * CHUNK_SIZE + idx < pos)
if(idx < pos || idx >= pos + len)
continue;
if(i * CHUNK_SIZE + idx >= pos + len)
continue;
buf[idx - offset] ^= byte;
buf[idx - pos] ^= byte;
}
}
}