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comparison: mobile/android/base/mozglue/DirectBufferAllocator.java
mobile/android/base/mozglue/DirectBufferAllocator.java
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| 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/. */ | |
| 5 | |
| 6 package org.mozilla.gecko.mozglue; | |
| 7 | |
| 8 import java.nio.ByteBuffer; | |
| 9 | |
| 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 // | |
| 15 | |
| 16 public final class DirectBufferAllocator { | |
| 17 private DirectBufferAllocator() {} | |
| 18 | |
| 19 public static ByteBuffer allocate(int size) { | |
| 20 if (size <= 0) { | |
| 21 throw new IllegalArgumentException("Invalid size " + size); | |
| 22 } | |
| 23 | |
| 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 } | |
| 30 | |
| 31 return directBuffer; | |
| 32 } | |
| 33 | |
| 34 public static ByteBuffer free(ByteBuffer buffer) { | |
| 35 if (buffer == null) { | |
| 36 return null; | |
| 37 } | |
| 38 | |
| 39 if (!buffer.isDirect()) { | |
| 40 throw new IllegalArgumentException("buffer must be direct"); | |
| 41 } | |
| 42 | |
| 43 nativeFreeDirectBuffer(buffer); | |
| 44 return null; | |
| 45 } | |
| 46 | |
| 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 } |
