making changes to common library, starting to integrate database functions

common/engine/filehashing.go

@@ -0,0 +1,14 @@
+package engine
+
+import (
+	"github.com/kalafut/imohash"
+)
+
+// UniqueFileHash creats a fast hash of a file. It's not bullet proof (could cause a collision, but in practice unlikely) but its fast
+func UniqueFileHash(src string) ([16]byte, error) {
+	hash, err := imohash.SumFile(src)
+	if err != nil {
+		return [16]byte{}, err
+	}
+	return hash, nil
+}