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diff --git a/vorbis/test/util.c b/vorbis/test/util.c
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+/********************************************************************
+ *                                                                  *
+ * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
+ * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
+ * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
+ * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
+ *                                                                  *
+ * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
+ * by the Xiph.Org Foundation http://www.xiph.org/                  *
+ *                                                                  *
+ ********************************************************************
+
+ function: utility functions for vorbis codec test suite.
+
+ ********************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <errno.h>
+
+#include <vorbis/codec.h>
+#include <vorbis/vorbisenc.h>
+
+#include "util.h"
+
+void
+gen_windowed_sine (float *data, int len, float maximum)
+{    int k ;
+
+    memset (data, 0, len * sizeof (float)) ;
+
+    len /= 2 ;
+
+    for (k = 0 ; k < len ; k++)
+    {    data [k] = sin (2.0 * k * M_PI * 1.0 / 32.0 + 0.4) ;
+
+        /* Apply Hanning Window. */
+        data [k] *= maximum * (0.5 - 0.5 * cos (2.0 * M_PI * k / ((len) - 1))) ;
+        }
+
+    return ;
+}
+
+void
+set_data_in (float * data, unsigned len, float value)
+{        unsigned k ;
+
+        for (k = 0 ; k < len ; k++)
+                data [k] = value ;
+}