1 files changed, 52 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/mozglue/DirectBufferAllocator.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/mozglue/DirectBufferAllocator.java
new file mode 100644
index 000000000..b3fb24291
--- /dev/null
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/mozglue/DirectBufferAllocator.java
@@ -0,0 +1,52 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.mozglue;
+
+import java.nio.ByteBuffer;
+
+//
+// We must manually allocate direct buffers in JNI to work around a bug where Honeycomb's
+// ByteBuffer.allocateDirect() grossly overallocates the direct buffer size.
+// https://code.google.com/p/android/issues/detail?id=16941
+//
+
+public final class DirectBufferAllocator {
+    private DirectBufferAllocator() {}
+
+    public static ByteBuffer allocate(int size) {
+        if (size <= 0) {
+            throw new IllegalArgumentException("Invalid size " + size);
+        }
+
+        ByteBuffer directBuffer = nativeAllocateDirectBuffer(size);
+        if (directBuffer == null) {
+            throw new OutOfMemoryError("allocateDirectBuffer() returned null");
+        }
+
+        if (!directBuffer.isDirect()) {
+            throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");
+        }
+
+        return directBuffer;
+    }
+
+    public static ByteBuffer free(ByteBuffer buffer) {
+        if (buffer == null) {
+            return null;
+        }
+
+        if (!buffer.isDirect()) {
+            throw new IllegalArgumentException("buffer must be direct");
+        }
+
+        nativeFreeDirectBuffer(buffer);
+        return null;
+    }
+
+    // These JNI methods are implemented in mozglue/android/nsGeckoUtils.cpp.
+    private static native ByteBuffer nativeAllocateDirectBuffer(long size);
+    private static native void nativeFreeDirectBuffer(ByteBuffer buf);
+}