78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SCOPED_BYTES_H_included
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#define SCOPED_BYTES_H_included
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#include "JNIHelp.h"
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/**
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* ScopedBytesRO and ScopedBytesRW attempt to paper over the differences between byte[]s and
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* ByteBuffers. This in turn helps paper over the differences between non-direct ByteBuffers backed
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* by byte[]s, direct ByteBuffers backed by bytes[]s, and direct ByteBuffers not backed by byte[]s.
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* (On Android, this last group only contains MappedByteBuffers.)
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*/
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template<bool readOnly>
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class ScopedBytes {
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public:
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ScopedBytes(JNIEnv* env, jobject object)
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: mEnv(env), mObject(object), mByteArray(NULL), mPtr(NULL)
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{
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if (mObject == NULL) {
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jniThrowNullPointerException(mEnv, NULL);
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} else if (mEnv->IsInstanceOf(mObject, JniConstants::byteArrayClass)) {
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mByteArray = reinterpret_cast<jbyteArray>(mObject);
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mPtr = mEnv->GetByteArrayElements(mByteArray, NULL);
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} else {
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mPtr = reinterpret_cast<jbyte*>(mEnv->GetDirectBufferAddress(mObject));
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}
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}
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~ScopedBytes() {
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if (mByteArray != NULL) {
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mEnv->ReleaseByteArrayElements(mByteArray, mPtr, readOnly ? JNI_ABORT : 0);
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}
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}
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private:
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JNIEnv* const mEnv;
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const jobject mObject;
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jbyteArray mByteArray;
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protected:
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jbyte* mPtr;
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private:
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DISALLOW_COPY_AND_ASSIGN(ScopedBytes);
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};
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class ScopedBytesRO : public ScopedBytes<true> {
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public:
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ScopedBytesRO(JNIEnv* env, jobject object) : ScopedBytes<true>(env, object) {}
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const jbyte* get() const {
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return mPtr;
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}
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};
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class ScopedBytesRW : public ScopedBytes<false> {
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public:
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ScopedBytesRW(JNIEnv* env, jobject object) : ScopedBytes<false>(env, object) {}
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jbyte* get() {
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return mPtr;
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}
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};
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#endif // SCOPED_BYTES_H_included
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