The Tor Browser: mobile/android/base/mozglue/DirectBufferAllocator.java@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.mozglue;

     8 import java.nio.ByteBuffer;

    10 //

    11 // We must manually allocate direct buffers in JNI to work around a bug where Honeycomb's

    12 // ByteBuffer.allocateDirect() grossly overallocates the direct buffer size.

    13 // https://code.google.com/p/android/issues/detail?id=16941

    14 //

    16 public final class DirectBufferAllocator {

    17     private DirectBufferAllocator() {}

    19     public static ByteBuffer allocate(int size) {

    20         if (size <= 0) {

    21             throw new IllegalArgumentException("Invalid size " + size);

    22         }

    24         ByteBuffer directBuffer = nativeAllocateDirectBuffer(size);

    25         if (directBuffer == null) {

    26             throw new OutOfMemoryError("allocateDirectBuffer() returned null");

    27         } else if (!directBuffer.isDirect()) {

    28             throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");

    29         }

    31         return directBuffer;

    32     }

    34     public static ByteBuffer free(ByteBuffer buffer) {

    35         if (buffer == null) {

    36             return null;

    37         }

    39         if (!buffer.isDirect()) {

    40             throw new IllegalArgumentException("buffer must be direct");

    41         }

    43         nativeFreeDirectBuffer(buffer);

    44         return null;

    45     }

    47     // These JNI methods are implemented in mozglue/android/nsGeckoUtils.cpp.

    48     private static native ByteBuffer nativeAllocateDirectBuffer(long size);

    49     private static native void nativeFreeDirectBuffer(ByteBuffer buf);

    50 }

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