1 files changed, 35 insertions, 0 deletions
diff --git a/weed/storage/needle/file_id.go b/weed/storage/needle/file_id.go
new file mode 100644
index 000000000..906877b8c
--- /dev/null
+++ b/weed/storage/needle/file_id.go
@@ -0,0 +1,35 @@
+package needle
+
+import (
+	"encoding/hex"
+
+	. "github.com/chrislusf/seaweedfs/weed/storage/types"
+)
+
+type FileId struct {
+	VolumeId VolumeId
+	Key      NeedleId
+	Cookie   Cookie
+}
+
+func NewFileIdFromNeedle(VolumeId VolumeId, n *Needle) *FileId {
+	return &FileId{VolumeId: VolumeId, Key: n.Id, Cookie: n.Cookie}
+}
+
+func NewFileId(VolumeId VolumeId, key uint64, cookie uint32) *FileId {
+	return &FileId{VolumeId: VolumeId, Key: Uint64ToNeedleId(key), Cookie: Uint32ToCookie(cookie)}
+}
+
+func (n *FileId) String() string {
+	return n.VolumeId.String() + "," + formatNeedleIdCookie(n.Key, n.Cookie)
+}
+
+func formatNeedleIdCookie(key NeedleId, cookie Cookie) string {
+	bytes := make([]byte, NeedleIdSize+CookieSize)
+	NeedleIdToBytes(bytes[0:NeedleIdSize], key)
+	CookieToBytes(bytes[NeedleIdSize:NeedleIdSize+CookieSize], cookie)
+	nonzero_index := 0
+	for ; bytes[nonzero_index] == 0; nonzero_index++ {
+	}
+	return hex.EncodeToString(bytes[nonzero_index:])
+}