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