reader.go | 10 ++++++++++
 t.go      |  8 ++++++++

diff --git a/reader.go b/reader.go
index b73b8bad4aeb57865086189a67f76ca26bc82616..1c8bce797dc4d9b9450ca5a865cc039b5b0a64b0 100644
--- a/reader.go
+++ b/reader.go
@@ -44,6 +44,11 @@ func (r *Reader) SetResponsive() {
 	r.responsive = true
 }
 
+// Disable responsive mode.
+func (r *Reader) SetNonResponsive() {
+	r.responsive = false
+}
+
 // Configure the number of bytes ahead of a read that should also be
 // prioritized in preparation for further reads.
 func (r *Reader) SetReadahead(readahead int64) {
@@ -53,6 +58,11 @@ 	r.mu.Unlock()
 	r.t.cl.mu.Lock()
 	defer r.t.cl.mu.Unlock()
 	r.posChanged()
+}
+
+// Return reader's current position.
+func (r *Reader) CurrentPos() int64 {
+	return r.pos
 }
 
 func (r *Reader) readable(off int64) (ret bool) {
diff --git a/t.go b/t.go
index ed810a5fd08d98d3d1f50babbc1063105d7c851e..3fe2ae79ad37afaa453ddf8c25fb5eae34cce6d3 100644
--- a/t.go
+++ b/t.go
@@ -61,6 +61,14 @@ func (t *Torrent) NumPieces() int {
 	return t.numPieces()
 }
 
+// Get missing bytes count for specific piece.
+func (t *Torrent) PieceBytesMissing(piece int) int64 {
+	t.cl.mu.Lock()
+	defer t.cl.mu.Unlock()
+
+	return int64(t.pieces[piece].bytesLeft())
+}
+
 // Drop the torrent from the client, and close it. It's always safe to do
 // this. No data corruption can, or should occur to either the torrent's data,
 // or connected peers.