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diff --git a/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/StreamUtil.java b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/StreamUtil.java
new file mode 100644
index 0000000..373cfff
--- /dev/null
+++ b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/util/StreamUtil.java
@@ -0,0 +1,96 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.Reader;
+import java.io.Writer;
+import java.nio.charset.Charset;
+
+import static com.threerings.getdown.Log.log;
+
+public class StreamUtil {
+    /**
+     * Convenient close for a stream. Use in a finally clause and love life.
+     */
+    public static void close (InputStream in)
+    {
+        if (in != null) {
+            try {
+                in.close();
+            } catch (IOException ioe) {
+                log.warning("Error closing input stream", "stream", in, "cause", ioe);
+            }
+        }
+    }
+
+    /**
+     * Convenient close for a stream. Use in a finally clause and love life.
+     */
+    public static void close (OutputStream out)
+    {
+        if (out != null) {
+            try {
+                out.close();
+            } catch (IOException ioe) {
+                log.warning("Error closing output stream", "stream", out, "cause", ioe);
+            }
+        }
+    }
+
+    /**
+     * Convenient close for a Reader. Use in a finally clause and love life.
+     */
+    public static void close (Reader in)
+    {
+        if (in != null) {
+            try {
+                in.close();
+            } catch (IOException ioe) {
+                log.warning("Error closing reader", "reader", in, "cause", ioe);
+            }
+        }
+    }
+
+    /**
+     * Convenient close for a Writer. Use in a finally clause and love life.
+     */
+    public static void close (Writer out)
+    {
+        if (out != null) {
+            try {
+                out.close();
+            } catch (IOException ioe) {
+                log.warning("Error closing writer", "writer", out, "cause", ioe);
+            }
+        }
+    }
+
+    /**
+     * Copies the contents of the supplied input stream to the supplied output stream.
+     */
+    public static <T extends OutputStream> T copy (InputStream in, T out)
+        throws IOException
+    {
+        byte[] buffer = new byte[4096];
+        for (int read = 0; (read = in.read(buffer)) > 0; ) {
+            out.write(buffer, 0, read);
+        }
+        return out;
+    }
+
+    /**
+     * Reads the contents of the supplied stream into a byte array.
+     */
+    public static byte[] toByteArray (InputStream stream)
+        throws IOException
+    {
+        return copy(stream, new ByteArrayOutputStream()).toByteArray();
+    }
+}