1 files changed, 27 insertions, 0 deletions
diff --git a/compare.go b/compare.go
new file mode 100644
index 0000000..7275a38
--- /dev/null
+++ b/compare.go
@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+    "os"
+    "io"
+    "crypto/md5"
+	"./drive"
+)
+
+type Md5Comparer struct {}
+
+func (self Md5Comparer) Changed(local *drive.LocalFile, remote *drive.RemoteFile) bool {
+    return remote.Md5() != md5sum(local.AbsPath())
+}
+
+func md5sum(path string) string {
+    h := md5.New()
+    f, err := os.Open(path)
+    if err != nil {
+        return ""
+    }
+    defer f.Close()
+
+    io.Copy(h, f)
+    return fmt.Sprintf("%x", h.Sum(nil))
+}