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-rw-r--r--internal/hash/func.go13
1 files changed, 13 insertions, 0 deletions
diff --git a/internal/hash/func.go b/internal/hash/func.go
new file mode 100644
index 0000000..41c4fd5
--- /dev/null
+++ b/internal/hash/func.go
@@ -0,0 +1,13 @@
+package hash
+
+// defaultHash is Chris Torek's hash function
+func defaultHash(key []byte) uint32 {
+ var h uint32
+ for _, v := range key {
+ h = hash4b(h, v)
+ }
+ return h
+}
+
+func hash4a(h uint32, v byte) uint32 { return (h << 5) - h + uint32(v) }
+func hash4b(h uint32, v byte) uint32 { return (h << 5) + h + uint32(v) }