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libudev: avoid potential misaligned accesses

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clang reports:
  src/libudev/libudev-util.c:665:35: warning: cast from
  "const unsigned char *" to "unsigned int *" increases required alignment
  from 1 to 4 [-Wcast-align]
This commit is contained in:
Jan Engelhardt 2013-03-20 15:23:32 +01:00 committed by Kay Sievers
parent 53726349e1
commit acd42fae59
1 changed files with 6 additions and 5 deletions
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11
src/libudev/libudev-util.c
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@ -568,7 +568,7 @@ err:
* Murmurhash is under the MIT license.
*
*/
static unsigned int murmur_hash2(const char *key, int len, unsigned int seed)
static unsigned int murmur_hash2(const char *key, size_t len, unsigned int seed)
{
/*
* 'm' and 'r' are mixing constants generated offline.
@ -583,17 +583,18 @@ static unsigned int murmur_hash2(const char *key, int len, unsigned int seed)
/* mix 4 bytes at a time into the hash */
const unsigned char * data = (const unsigned char *)key;
while(len >= 4) {
unsigned int k = *(unsigned int *)data;
while(len >= sizeof(unsigned int)) {
unsigned int k;
memcpy(&k, data, sizeof(k));
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
data += 4;
len -= 4;
data += sizeof(k);
len -= sizeof(k);
}
/* handle the last few bytes of the input array */