89 lines
3.2 KiB
Java
89 lines
3.2 KiB
Java
/*
|
|
* Copyright (C) 2023 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.
|
|
*/
|
|
|
|
package android.adservices.common;
|
|
|
|
import android.annotation.NonNull;
|
|
import android.content.res.AssetFileDescriptor;
|
|
import android.os.ParcelFileDescriptor;
|
|
|
|
import com.android.adservices.LoggerFactory;
|
|
|
|
import java.io.DataInputStream;
|
|
import java.io.FileOutputStream;
|
|
import java.io.IOException;
|
|
import java.util.Objects;
|
|
import java.util.concurrent.ExecutorService;
|
|
|
|
/**
|
|
* Utility class used to set up the read and write pipes for the usage of reading pointers from
|
|
* shared memory.
|
|
*
|
|
* @hide
|
|
*/
|
|
public class AssetFileDescriptorUtil {
|
|
private static final LoggerFactory.Logger sLogger = LoggerFactory.getFledgeLogger();
|
|
|
|
private AssetFileDescriptorUtil() {}
|
|
|
|
/**
|
|
* Creates a read and write pipe, writes the data in {@code buffer} into the write end, and
|
|
* returns the read end in the form of a {@link AssetFileDescriptor}.
|
|
*
|
|
* @throws IOException if an exception is encountered while creating or writing to the pipe
|
|
*/
|
|
public static AssetFileDescriptor setupAssetFileDescriptorResponse(
|
|
@NonNull byte[] buffer, @NonNull ExecutorService executorService) throws IOException {
|
|
Objects.requireNonNull(buffer);
|
|
Objects.requireNonNull(executorService);
|
|
|
|
ParcelFileDescriptor[] descriptors = ParcelFileDescriptor.createPipe();
|
|
ParcelFileDescriptor writeDescriptor = descriptors[1];
|
|
|
|
executorService.execute(
|
|
() -> {
|
|
try (FileOutputStream outputStream =
|
|
new FileOutputStream(writeDescriptor.getFileDescriptor())) {
|
|
outputStream.write(buffer);
|
|
} catch (IOException e) {
|
|
sLogger.e(
|
|
e, "Encountered IO Exception while writing byte array to stream.");
|
|
}
|
|
});
|
|
return new AssetFileDescriptor(descriptors[0], 0, buffer.length);
|
|
}
|
|
|
|
/**
|
|
* Reads the content the {@link AssetFileDescriptor} points to into a buffer and returns the
|
|
* number of bytes read.
|
|
*
|
|
* @throws IOException if an exception is encountered while reading the content.
|
|
*/
|
|
public static byte[] readAssetFileDescriptorIntoBuffer(
|
|
@NonNull AssetFileDescriptor assetFileDescriptor) throws IOException {
|
|
Objects.requireNonNull(assetFileDescriptor);
|
|
|
|
byte[] result = new byte[(int) assetFileDescriptor.getLength()];
|
|
|
|
try (DataInputStream inputStream =
|
|
new DataInputStream(assetFileDescriptor.createInputStream())) {
|
|
inputStream.readFully(result);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
}
|