Add app source, add vendoring and module support

vendor/github.com/dgryski/go-farm/basics.go

@@ -0,0 +1,30 @@
+package farm
+
+// Some primes between 2^63 and 2^64 for various uses.
+const k0 uint64 = 0xc3a5c85c97cb3127
+const k1 uint64 = 0xb492b66fbe98f273
+const k2 uint64 = 0x9ae16a3b2f90404f
+
+// Magic numbers for 32-bit hashing.  Copied from Murmur3.
+const c1 uint32 = 0xcc9e2d51
+const c2 uint32 = 0x1b873593
+
+// A 32-bit to 32-bit integer hash copied from Murmur3.
+func fmix(h uint32) uint32 {
+	h ^= h >> 16
+	h *= 0x85ebca6b
+	h ^= h >> 13
+	h *= 0xc2b2ae35
+	h ^= h >> 16
+	return h
+}
+
+func mur(a, h uint32) uint32 {
+	// Helper from Murmur3 for combining two 32-bit values.
+	a *= c1
+	a = rotate32(a, 17)
+	a *= c2
+	h ^= a
+	h = rotate32(h, 19)
+	return h*5 + 0xe6546b64
+}