89 lines
3.2 KiB
Java
89 lines
3.2 KiB
Java
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/*
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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.adservices.common;
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import android.annotation.NonNull;
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import android.content.res.AssetFileDescriptor;
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import android.os.ParcelFileDescriptor;
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import com.android.adservices.LoggerFactory;
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import java.io.DataInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.Objects;
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import java.util.concurrent.ExecutorService;
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/**
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* Utility class used to set up the read and write pipes for the usage of reading pointers from
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* shared memory.
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*
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* @hide
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*/
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public class AssetFileDescriptorUtil {
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private static final LoggerFactory.Logger sLogger = LoggerFactory.getFledgeLogger();
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private AssetFileDescriptorUtil() {}
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/**
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* Creates a read and write pipe, writes the data in {@code buffer} into the write end, and
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* returns the read end in the form of a {@link AssetFileDescriptor}.
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*
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* @throws IOException if an exception is encountered while creating or writing to the pipe
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*/
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public static AssetFileDescriptor setupAssetFileDescriptorResponse(
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@NonNull byte[] buffer, @NonNull ExecutorService executorService) throws IOException {
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Objects.requireNonNull(buffer);
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Objects.requireNonNull(executorService);
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ParcelFileDescriptor[] descriptors = ParcelFileDescriptor.createPipe();
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ParcelFileDescriptor writeDescriptor = descriptors[1];
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executorService.execute(
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() -> {
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try (FileOutputStream outputStream =
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new FileOutputStream(writeDescriptor.getFileDescriptor())) {
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outputStream.write(buffer);
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} catch (IOException e) {
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sLogger.e(
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e, "Encountered IO Exception while writing byte array to stream.");
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}
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});
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return new AssetFileDescriptor(descriptors[0], 0, buffer.length);
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}
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/**
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* Reads the content the {@link AssetFileDescriptor} points to into a buffer and returns the
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* number of bytes read.
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*
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* @throws IOException if an exception is encountered while reading the content.
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*/
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public static byte[] readAssetFileDescriptorIntoBuffer(
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@NonNull AssetFileDescriptor assetFileDescriptor) throws IOException {
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Objects.requireNonNull(assetFileDescriptor);
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byte[] result = new byte[(int) assetFileDescriptor.getLength()];
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try (DataInputStream inputStream =
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new DataInputStream(assetFileDescriptor.createInputStream())) {
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inputStream.readFully(result);
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}
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return result;
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}
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}
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