diff --git a/src/window.c b/src/window.c
index 45bc2fd..a99e061 100644
--- a/src/window.c
+++ b/src/window.c
@@ -25,6 +25,12 @@
 #include "common.h"
 #include "window.h"
 
+void
+window_buffer_reset(struct frag_buffer *w)
+{
+
+}
+
 struct frag_buffer *
 window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int dir)
 {
@@ -53,6 +59,26 @@ window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int di
 	return buf;
 }
 
+void
+window_buffer_resize(struct frag_buffer *w, size_t length)
+{
+	if (w->length == length) return;
+	if (w->numitems > 0) {
+		warnx("Resizing window buffer with things still in it! This will cause problems!");
+	}
+	if (w->frags) free(w->frags);
+	w->frags = calloc(length, sizeof(fragment));
+	if (!w->frags) {
+		errx(1, "Failed to resize window buffer!");
+	}
+	w->length = length;
+	w->numitems = 0;
+	w->window_start = 0;
+	w->start_seq_id = 0;
+	w->cur_seq_id = 0;
+	w->window_end = AFTER(w, w->windowsize);
+}
+
 void
 window_buffer_destroy(struct frag_buffer *w)
 {
diff --git a/src/window.h b/src/window.h
index 2d71910..fc9e506 100644
--- a/src/window.h
+++ b/src/window.h
@@ -46,7 +46,6 @@ struct frag_buffer {
 	size_t numitems;	/* number of non-empty fragments stored in buffer */
 	size_t window_start;	/* Start of window */
 	size_t window_end;	/* End of window (index) */
-//	size_t last_sent;	/* Last fragment sent (index) */
 	size_t last_write;	/* Last fragment read/written */
 	size_t chunk_start;	/* Start of current chunk of fragments, ie where fragno = 0 */
 	unsigned cur_seq_id;	/* Most recent sequence ID */
@@ -73,6 +72,7 @@ struct frag_buffer {
 #define WRAP(x) ((x) % w->length)
 
 struct frag_buffer *window_buffer_init(size_t length, unsigned windowsize, unsigned fragsize, int dir);
+void window_buffer_resize(struct frag_buffer *w, size_t length);
 void window_buffer_destroy(struct frag_buffer *w);
 
 /* Returns number of available fragment slots (NOT BYTES) */