Jeongik Cha | 8cb2345 | 2020-08-26 23:38:03 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 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 <binder/Parcel.h> |
| 18 | #include <binder/Parcelable.h> |
| 19 | #include <binder/ParcelableHolder.h> |
| 20 | |
| 21 | #define RETURN_ON_FAILURE(expr) \ |
| 22 | do { \ |
| 23 | android::status_t _status = (expr); \ |
| 24 | if (_status != android::OK) return _status; \ |
| 25 | } while (false) |
| 26 | |
| 27 | namespace android { |
| 28 | namespace os { |
| 29 | status_t ParcelableHolder::writeToParcel(Parcel* p) const { |
Jeongik Cha | 8cb2345 | 2020-08-26 23:38:03 +0900 | [diff] [blame] | 30 | RETURN_ON_FAILURE(p->writeInt32(static_cast<int32_t>(this->getStability()))); |
| 31 | if (this->mParcelPtr) { |
| 32 | RETURN_ON_FAILURE(p->writeInt32(this->mParcelPtr->dataSize())); |
| 33 | RETURN_ON_FAILURE(p->appendFrom(this->mParcelPtr.get(), 0, this->mParcelPtr->dataSize())); |
| 34 | return OK; |
| 35 | } |
| 36 | if (this->mParcelable) { |
| 37 | size_t sizePos = p->dataPosition(); |
| 38 | RETURN_ON_FAILURE(p->writeInt32(0)); |
| 39 | size_t dataStartPos = p->dataPosition(); |
Steven Moreland | 0bda2d2 | 2021-01-08 02:13:00 +0000 | [diff] [blame] | 40 | RETURN_ON_FAILURE(p->writeString16(this->mParcelableName)); |
Jeongik Cha | 8cb2345 | 2020-08-26 23:38:03 +0900 | [diff] [blame] | 41 | this->mParcelable->writeToParcel(p); |
| 42 | size_t dataSize = p->dataPosition() - dataStartPos; |
| 43 | |
| 44 | p->setDataPosition(sizePos); |
| 45 | RETURN_ON_FAILURE(p->writeInt32(dataSize)); |
| 46 | p->setDataPosition(p->dataPosition() + dataSize); |
| 47 | return OK; |
| 48 | } |
| 49 | |
| 50 | RETURN_ON_FAILURE(p->writeInt32(0)); |
| 51 | return OK; |
| 52 | } |
| 53 | |
| 54 | status_t ParcelableHolder::readFromParcel(const Parcel* p) { |
Jeongik Cha | 8cb2345 | 2020-08-26 23:38:03 +0900 | [diff] [blame] | 55 | this->mStability = static_cast<Stability>(p->readInt32()); |
| 56 | this->mParcelable = nullptr; |
| 57 | this->mParcelableName = std::nullopt; |
| 58 | int32_t rawDataSize; |
| 59 | |
| 60 | status_t status = p->readInt32(&rawDataSize); |
| 61 | if (status != android::OK || rawDataSize < 0) { |
| 62 | this->mParcelPtr = nullptr; |
| 63 | return status != android::OK ? status : BAD_VALUE; |
| 64 | } |
| 65 | if (rawDataSize == 0) { |
| 66 | if (this->mParcelPtr) { |
| 67 | this->mParcelPtr = nullptr; |
| 68 | } |
| 69 | return OK; |
| 70 | } |
| 71 | |
| 72 | size_t dataSize = rawDataSize; |
| 73 | |
| 74 | size_t dataStartPos = p->dataPosition(); |
| 75 | |
| 76 | if (dataStartPos > SIZE_MAX - dataSize) { |
| 77 | this->mParcelPtr = nullptr; |
| 78 | return BAD_VALUE; |
| 79 | } |
| 80 | |
| 81 | if (!this->mParcelPtr) { |
| 82 | this->mParcelPtr = std::make_unique<Parcel>(); |
| 83 | } |
| 84 | this->mParcelPtr->freeData(); |
| 85 | |
| 86 | status = this->mParcelPtr->appendFrom(p, dataStartPos, dataSize); |
| 87 | if (status != android::OK) { |
| 88 | this->mParcelPtr = nullptr; |
| 89 | return status; |
| 90 | } |
| 91 | p->setDataPosition(dataStartPos + dataSize); |
| 92 | return OK; |
| 93 | } |
| 94 | } // namespace os |
| 95 | } // namespace android |