98 lines
3.5 KiB
Java
98 lines
3.5 KiB
Java
/*
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* Copyright (C) 2023 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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package android.health.connect.internal;
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import android.annotation.NonNull;
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import android.os.IBinder;
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import android.os.Parcel;
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import android.os.SharedMemory;
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import android.system.ErrnoException;
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import com.android.internal.annotations.VisibleForTesting;
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import java.nio.ByteBuffer;
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/** @hide */
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public final class ParcelUtils {
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@VisibleForTesting public static final int USING_SHARED_MEMORY = 0;
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@VisibleForTesting public static final int USING_PARCEL = 1;
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@VisibleForTesting
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public static final int IPC_PARCEL_LIMIT = IBinder.getSuggestedMaxIpcSizeBytes() / 2;
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public interface IPutToParcelRunnable {
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void writeToParcel(Parcel dest);
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}
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@NonNull
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public static Parcel getParcelForSharedMemoryIfRequired(Parcel in) {
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int parcelType = in.readInt();
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if (parcelType == USING_SHARED_MEMORY) {
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try (SharedMemory memory = SharedMemory.CREATOR.createFromParcel(in)) {
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Parcel dataParcel = Parcel.obtain();
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ByteBuffer buffer = memory.mapReadOnly();
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byte[] payload = new byte[buffer.limit()];
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buffer.get(payload);
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dataParcel.unmarshall(payload, 0, payload.length);
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dataParcel.setDataPosition(0);
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return dataParcel;
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} catch (ErrnoException e) {
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throw new RuntimeException(e);
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}
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}
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return in;
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}
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public static SharedMemory getSharedMemoryForParcel(Parcel dataParcel, int dataParcelSize) {
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try {
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SharedMemory sharedMemory =
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SharedMemory.create("RecordsParcelSharedMemory", dataParcelSize);
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ByteBuffer buffer = sharedMemory.mapReadWrite();
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byte[] data = dataParcel.marshall();
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buffer.put(data, 0, dataParcelSize);
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return sharedMemory;
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} catch (ErrnoException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* Determines which memory to use and puts the {@code parcel} in it, and details of it in {@code
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* dest}
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*/
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public static void putToRequiredMemory(
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Parcel dest, int flags, IPutToParcelRunnable parcelRunnable) {
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final Parcel dataParcel = Parcel.obtain();
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try {
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parcelRunnable.writeToParcel(dataParcel);
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final int dataParcelSize = dataParcel.dataSize();
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if (dataParcelSize > IPC_PARCEL_LIMIT) {
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try (SharedMemory sharedMemory =
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ParcelUtils.getSharedMemoryForParcel(dataParcel, dataParcelSize)) {
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dest.writeInt(USING_SHARED_MEMORY);
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sharedMemory.writeToParcel(dest, flags);
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}
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} else {
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dest.writeInt(USING_PARCEL);
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parcelRunnable.writeToParcel(dest);
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}
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} finally {
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dataParcel.recycle();
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}
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}
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}
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