1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "android_nio_utils.h"
18
19 #include "core_jni_helpers.h"
20
21 namespace android {
22
AutoBufferPointer(JNIEnv * env,jobject nioBuffer,jboolean commit)23 AutoBufferPointer::AutoBufferPointer(JNIEnv* env, jobject nioBuffer, jboolean commit)
24 : fEnv(env), fCommit(commit) {
25 jlong pointer = jniGetNioBufferPointer(fEnv, nioBuffer);
26 if (pointer != 0L) {
27 // Buffer is backed by a direct buffer.
28 fArray = nullptr;
29 fElements = nullptr;
30 fPointer = reinterpret_cast<void*>(pointer);
31 } else {
32 // Buffer is backed by a managed array.
33 jint byteOffset = jniGetNioBufferBaseArrayOffset(fEnv, nioBuffer);
34 fArray = jniGetNioBufferBaseArray(fEnv, nioBuffer);
35 fElements = fEnv->GetPrimitiveArrayCritical(fArray, /* isCopy= */ nullptr);
36 fPointer = reinterpret_cast<void*>(reinterpret_cast<char*>(fElements) + byteOffset);
37 }
38 }
39
~AutoBufferPointer()40 AutoBufferPointer::~AutoBufferPointer() {
41 if (nullptr != fArray) {
42 fEnv->ReleasePrimitiveArrayCritical(fArray, fElements, fCommit ? 0 : JNI_ABORT);
43 }
44 }
45
46 } // namespace android
47