Merge "change fileinputstream to filechannel" into main

import android.compat.annotation.UnsupportedAppUsage;

import java.io.Closeable;

import java.io.FileInputStream;

import java.nio.MappedByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.file.Paths;

import java.nio.file.StandardOpenOption;

/** @hide */

public class StorageInternalReader {

    // Map a storage file given file path

    private static MappedByteBuffer mapStorageFile(String file) {

        FileInputStream stream = null;

        FileChannel channel = null;

        try {

            stream = new FileInputStream(file);

            FileChannel channel = stream.getChannel();

            channel = FileChannel.open(Paths.get(file), StandardOpenOption.READ);

            return channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());

        } catch (Exception e) {

            throw new AconfigStorageException(

                    String.format("Fail to mmap storage file %s", file), e);

        } finally {

            quietlyDispose(stream);

            quietlyDispose(channel);

        }

    }