From c8676f7ffe210dafc142edec987ead3d7348b532 Mon Sep 17 00:00:00 2001
From: Alexey Andreev <konsoletyper@gmail.com>
Date: Fri, 31 May 2019 17:36:32 +0300
Subject: [PATCH] JavaScript: fix filesystem issue

---
 .../org/teavm/classlib/fs/memory/InMemoryVirtualFile.java     | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/classlib/src/main/java/org/teavm/classlib/fs/memory/InMemoryVirtualFile.java b/classlib/src/main/java/org/teavm/classlib/fs/memory/InMemoryVirtualFile.java
index a398d8d58..0f9dc31f8 100644
--- a/classlib/src/main/java/org/teavm/classlib/fs/memory/InMemoryVirtualFile.java
+++ b/classlib/src/main/java/org/teavm/classlib/fs/memory/InMemoryVirtualFile.java
@@ -53,6 +53,10 @@ public class InMemoryVirtualFile extends AbstractInMemoryVirtualFile {
             return null;
         }
 
+        if (writable && readOnly) {
+            return null;
+        }
+
         return new VirtualFileAccessor() {
             @Override
             public int read(int pos, byte[] buffer, int offset, int limit) {