Merge "Tweak buffer size for APK checksumming."

import com.android.internal.security.VerityUtils;

import com.android.server.pm.parsing.pkg.AndroidPackage;

import java.io.BufferedInputStream;

import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

        }

    }

    static final int MIN_BUFFER_SIZE = 4 * 1024;

    static final int MAX_BUFFER_SIZE = 128 * 1024;

    private static byte[] getApkChecksum(File file, int type) {

        try (FileInputStream fis = new FileInputStream(file);

             BufferedInputStream bis = new BufferedInputStream(fis)) {

            byte[] dataBytes = new byte[512 * 1024];

        final int bufferSize = (int) Math.max(MIN_BUFFER_SIZE,

                Math.min(MAX_BUFFER_SIZE, file.length()));

        try (FileInputStream fis = new FileInputStream(file)) {

            final byte[] buffer = new byte[bufferSize];

            int nread = 0;

            final String algo = getMessageDigestAlgoForChecksumKind(type);

            MessageDigest md = MessageDigest.getInstance(algo);

            while ((nread = bis.read(dataBytes)) != -1) {

                md.update(dataBytes, 0, nread);

            while ((nread = fis.read(buffer)) != -1) {

                md.update(buffer, 0, nread);

            }

            return md.digest();