Switched to HAMT and BDWGC

1 files changed, 40 insertions, 0 deletions

diff --git a/src/murmur3.c b/src/murmur3.c
new file mode 100644
index 0000000..bb1f666
--- /dev/null
+++ b/src/murmur3.c
@@ -0,0 +1,40 @@
+#include "murmur3.h"
+
+#include <string.h>
+
+static inline uint32_t murmur_32_scramble(uint32_t k)
+{
+    k *= 0xcc9e2d51;
+    k = (k << 15) | (k >> 17);
+    k *= 0x1b873593;
+    return k;
+}
+
+uint32_t murmur3_32(const uint8_t *key, size_t len, uint32_t seed)
+{
+    uint32_t h = seed;
+    uint32_t k;
+    /* Read in groups of 4. */
+    for (size_t i = len >> 2; i; i--) {
+        memcpy(&k, key, sizeof(uint32_t));
+        key += sizeof(uint32_t);
+        h ^= murmur_32_scramble(k);
+        h = (h << 13) | (h >> 19);
+        h = h * 5 + 0xe6546b64;
+    }
+    /* Read the rest. */
+    k = 0;
+    for (size_t i = len & 3; i; i--) {
+        k <<= 8;
+        k |= key[i - 1];
+    }
+    h ^= murmur_32_scramble(k);
+    /* Finalize. */
+    h ^= len;
+    h ^= h >> 16;
+    h *= 0x85ebca6b;
+    h ^= h >> 13;
+    h *= 0xc2b2ae35;
+    h ^= h >> 16;
+    return h;
+}