client.go | 26 ++++++++++++++++++++++++++

diff --git a/client.go b/client.go
index d043f06704574ede1919131543dbb30f099d2e37..9fe47f0655b4651e7ccaf04765182576c89fce4a 100644
--- a/client.go
+++ b/client.go
@@ -1653,12 +1653,37 @@ 	t      Torrent
 	path   string
 	offset int64
 	length int64
+	metainfo.FileInfo
 }
 
 func (f *File) Length() int64 {
 	return f.length
 }
 
+type FilePieceState struct {
+	Length int64
+	State  byte
+}
+
+func (f *File) Progress() (ret []FilePieceState) {
+	pieceSize := int64(f.t.UsualPieceSize())
+	off := f.offset % pieceSize
+	remaining := f.length
+	for i := int(f.offset / pieceSize); ; i++ {
+		if remaining == 0 {
+			break
+		}
+		len1 := pieceSize - off
+		if len1 > remaining {
+			len1 = remaining
+		}
+		ret = append(ret, FilePieceState{len1, f.t.pieceStatusChar(i)})
+		off = 0
+		remaining -= len1
+	}
+	return
+}
+
 func (f *File) PrioritizeRegion(off, len int64) {
 	if off < 0 || off >= f.length {
 		return
@@ -1680,6 +1705,7 @@ 			t,
 			strings.Join(fi.Path, "/"),
 			offset,
 			fi.Length,
+			fi,
 		})
 		offset += fi.Length
 	}