diff -r c3dee54ecc15 -r 66c99d4b3532 rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Sun Mar 20 15:26:19 2016 +0100
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Mon Mar 28 07:22:41 2016 +0200
@@ -107,7 +107,11 @@
             append("\n  ").append(getExportsObject()).append("['registerResource']('");
             append(r).append("', '");
             InputStream is = this.resources.get(r);
-            byte[] arr = new byte[is.available()];
+            int avail = is.available();
+            if (avail <= 0) {
+                avail = 4096;
+            }
+            byte[] arr = new byte[avail];
             int offset = 0;
             for (;;) {
                 if (offset == arr.length) {