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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "android_nio_utils.h"
#include <nativehelper/JNIPlatformHelp.h>
namespace android {
AutoBufferPointer::AutoBufferPointer(JNIEnv* env, jobject nioBuffer, jboolean commit)
: fEnv(env), fCommit(commit) {
jlong pointer = jniGetNioBufferPointer(fEnv, nioBuffer);
if (pointer != 0L) {
// Buffer is backed by a direct buffer.
fArray = nullptr;
fElements = nullptr;
fPointer = reinterpret_cast<void*>(pointer);
} else {
// Buffer is backed by a managed array.
jint byteOffset = jniGetNioBufferBaseArrayOffset(fEnv, nioBuffer);
fArray = jniGetNioBufferBaseArray(fEnv, nioBuffer);
fElements = fEnv->GetPrimitiveArrayCritical(fArray, /* isCopy= */ nullptr);
fPointer = reinterpret_cast<void*>(reinterpret_cast<char*>(fElements) + byteOffset);
}
}
AutoBufferPointer::~AutoBufferPointer() {
if (nullptr != fArray) {
fEnv->ReleasePrimitiveArrayCritical(fArray, fElements, fCommit ? 0 : JNI_ABORT);
}
}
} // namespace android
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