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authorKay Sievers <kay@vrfy.org>2013-12-23 02:46:39 +0100
committerKay Sievers <kay@vrfy.org>2013-12-23 02:55:06 +0100
commit57d0e6b2731ab695d14b7cf496832ba416cc43d3 (patch)
tree05ecec164b8aa0a2d95fb5f53a3b7a110b137d67 /src/libudev/libudev-util.c
parent91d53e2b896ed3b1e76c3117a7acb74e4edc921f (diff)
libudev: ship the original MurmurHash2.[ch] file
Diffstat (limited to 'src/libudev/libudev-util.c')
-rw-r--r--src/libudev/libudev-util.c58
1 files changed, 2 insertions, 56 deletions
diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c
index b5b9db67fc..c940e06f71 100644
--- a/src/libudev/libudev-util.c
+++ b/src/libudev/libudev-util.c
@@ -36,6 +36,7 @@
#include "libudev.h"
#include "libudev-private.h"
#include "utf8.h"
+#include "MurmurHash2.h"
/**
* SECTION:libudev-util
@@ -396,64 +397,9 @@ _public_ int udev_util_encode_string(const char *str, char *str_enc, size_t len)
return encode_devnode_name(str, str_enc, len);
}
-/*
- * http://sites.google.com/site/murmurhash/
- *
- * All code is released to the public domain. For business purposes,
- * Murmurhash is under the MIT license.
- *
- */
-static unsigned int murmur_hash2(const char *key, size_t len, unsigned int seed)
-{
- /*
- * 'm' and 'r' are mixing constants generated offline.
- * They're not really 'magic', they just happen to work well.
- */
- const unsigned int m = 0x5bd1e995;
- const int r = 24;
-
- /* initialize the hash to a 'random' value */
- unsigned int h = seed ^ len;
-
- /* mix 4 bytes at a time into the hash */
- const unsigned char * data = (const unsigned char *)key;
-
- 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 += sizeof(k);
- len -= sizeof(k);
- }
-
- /* handle the last few bytes of the input array */
- switch(len) {
- case 3:
- h ^= data[2] << 16;
- case 2:
- h ^= data[1] << 8;
- case 1:
- h ^= data[0];
- h *= m;
- };
-
- /* do a few final mixes of the hash to ensure the last few bytes are well-incorporated */
- h ^= h >> 13;
- h *= m;
- h ^= h >> 15;
-
- return h;
-}
-
unsigned int util_string_hash32(const char *str)
{
- return murmur_hash2(str, strlen(str), 0);
+ return MurmurHash2(str, strlen(str), 0);
}
/* get a bunch of bit numbers out of the hash, and set the bits in our bit field */