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/* -*- 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.libreoffice.kit;
//
// 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
//
import android.util.Log;
import java.nio.ByteBuffer;
public final class DirectBufferAllocator {
private static final String LOGTAG = DirectBufferAllocator.class.getSimpleName();
private DirectBufferAllocator() {
}
private static native ByteBuffer allocateDirectBufferNative(int size);
private static native void freeDirectBufferNative(ByteBuffer aBuffer);
public static ByteBuffer allocate(int size) {
return allocateVM(size);
}
public static ByteBuffer free(ByteBuffer buffer) {
return freeVM(buffer);
}
private static ByteBuffer allocateJNI(int size) {
ByteBuffer directBuffer = allocateDirectBufferNative(size);
if (directBuffer == null) {
if (size <= 0) {
throw new IllegalArgumentException("Invalid allocation size: " + size);
} else {
throw new OutOfMemoryError("allocateDirectBuffer() returned null");
}
} else if (!directBuffer.isDirect()) {
throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");
}
return directBuffer;
}
private static ByteBuffer freeJNI(ByteBuffer buffer) {
if (buffer == null) {
return null;
}
if (!buffer.isDirect()) {
throw new IllegalArgumentException("ByteBuffer must be direct");
}
freeDirectBufferNative(buffer);
return null;
}
private static ByteBuffer allocateVM(int size) {
ByteBuffer directBuffer = ByteBuffer.allocateDirect(size);
if (directBuffer == null) {
if (size <= 0) {
throw new IllegalArgumentException("Invalid allocation size: " + size);
} else {
throw new OutOfMemoryError("allocateDirectBuffer() returned null");
}
} else if (!directBuffer.isDirect()) {
throw new AssertionError("allocateDirectBuffer() did not return a direct buffer");
}
return directBuffer;
}
private static ByteBuffer freeVM(ByteBuffer buffer) {
if (buffer == null) {
return null;
}
if (!buffer.isDirect()) {
throw new IllegalArgumentException("ByteBuffer must be direct");
}
// can't free buffer - leave this to the VM
return null;
}
}
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