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/*
* Copyright (C) 2020 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 <binder/Parcel.h>
#include <binder/Parcelable.h>
#include <binder/ParcelableHolder.h>
#define RETURN_ON_FAILURE(expr) \
do { \
android::status_t _status = (expr); \
if (_status != android::OK) return _status; \
} while (false)
namespace android {
namespace os {
status_t ParcelableHolder::writeToParcel(Parcel* p) const {
RETURN_ON_FAILURE(p->writeInt32(static_cast<int32_t>(this->getStability())));
if (this->mParcelPtr) {
RETURN_ON_FAILURE(p->writeInt32(this->mParcelPtr->dataSize()));
RETURN_ON_FAILURE(p->appendFrom(this->mParcelPtr.get(), 0, this->mParcelPtr->dataSize()));
return OK;
}
if (this->mParcelable) {
size_t sizePos = p->dataPosition();
RETURN_ON_FAILURE(p->writeInt32(0));
size_t dataStartPos = p->dataPosition();
RETURN_ON_FAILURE(p->writeString16(this->mParcelableName));
this->mParcelable->writeToParcel(p);
size_t dataSize = p->dataPosition() - dataStartPos;
p->setDataPosition(sizePos);
RETURN_ON_FAILURE(p->writeInt32(dataSize));
p->setDataPosition(p->dataPosition() + dataSize);
return OK;
}
RETURN_ON_FAILURE(p->writeInt32(0));
return OK;
}
status_t ParcelableHolder::readFromParcel(const Parcel* p) {
this->mStability = static_cast<Stability>(p->readInt32());
this->mParcelable = nullptr;
this->mParcelableName = std::nullopt;
int32_t rawDataSize;
status_t status = p->readInt32(&rawDataSize);
if (status != android::OK || rawDataSize < 0) {
this->mParcelPtr = nullptr;
return status != android::OK ? status : BAD_VALUE;
}
if (rawDataSize == 0) {
if (this->mParcelPtr) {
this->mParcelPtr = nullptr;
}
return OK;
}
size_t dataSize = rawDataSize;
size_t dataStartPos = p->dataPosition();
if (dataStartPos > SIZE_MAX - dataSize) {
this->mParcelPtr = nullptr;
return BAD_VALUE;
}
if (!this->mParcelPtr) {
this->mParcelPtr = std::make_unique<Parcel>();
}
this->mParcelPtr->freeData();
status = this->mParcelPtr->appendFrom(p, dataStartPos, dataSize);
if (status != android::OK) {
this->mParcelPtr = nullptr;
return status;
}
p->setDataPosition(dataStartPos + dataSize);
return OK;
}
} // namespace os
} // namespace android
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