翰林优商.apk(点击下载) / a.java

package com.kwad.sdk.utils;

import android.text.TextUtils;
import com.kwad.sdk.core.e.b;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;

public final class a {
    public static byte[] ff(String str) {
        if (TextUtils.isEmpty(str)) {
            return null;
        }
        return getFileMD5Digest(new File(str));
    }

    public static String getFileMD5(File file) {
        try {
            byte[] fileMD5Digest = getFileMD5Digest(file);
            if (fileMD5Digest != null) {
                if (fileMD5Digest.length != 0) {
                    return ac.toHexString(fileMD5Digest, 0, fileMD5Digest.length);
                }
            }
            return null;
        } catch (IOException e) {
            b.e("FileMD5Utils", "cannot calculate md5 of file", e);
            return null;
        }
    }

    public static byte[] getFileMD5Digest(File file) {
        if (file == null) {
            return null;
        }
        FileInputStream fileInputStream = new FileInputStream(file);
        try {
            MessageDigest instance = MessageDigest.getInstance("MD5");
            byte[] bArr = new byte[4096];
            while (true) {
                int read = fileInputStream.read(bArr);
                if (read == -1) {
                    return instance.digest();
                }
                instance.update(bArr, 0, read);
            }
        } catch (Exception e) {
            b.e("FileMD5Utils", "getting file md5 digest error.", e);
            return null;
        } finally {
            com.kwad.sdk.crash.utils.b.closeQuietly(fileInputStream);
        }
    }
}