├── .gitignore ├── .idea ├── compiler.xml ├── copyright │ └── profiles_settings.xml ├── gradle.xml ├── misc.xml ├── modules.xml └── runConfigurations.xml ├── Purify.apk ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── android │ │ └── purify │ │ └── ExampleInstrumentedTest.java │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── android │ │ │ └── purify │ │ │ ├── MainActivity.java │ │ │ ├── Purify.java │ │ │ └── util │ │ │ ├── FileUtil.java │ │ │ └── ReplacingInputStream.java │ └── res │ │ ├── layout │ │ └── activity_main.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ └── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── com │ └── android │ └── purify │ └── ExampleUnitTest.java ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/workspace.xml 5 | /.idea/libraries 6 | .DS_Store 7 | /build 8 | /captures 9 | .externalNativeBuild 10 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /.idea/copyright/profiles_settings.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 19 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 46 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /Purify.apk: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/echo-devim/purify/c847de0751d42db220f5a8ccfb9891e62d4a5b94/Purify.apk -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Purify 2 | Purify is a Proof-of-Concept Android application that can remove advertisements (ads) from any apk (i.e. Android app). It doesn't need root privileges. 3 | ### Disclaimer 4 | This application is just a proof of concept, I wrote it in few hours. The code isn't so tidy and the application can fail. If the application fails, the new purified apk (i.e. without ads) will crash. 5 | ### How it works 6 | Purify takes in input an apk and changes the content of `classes.dex`. In details, the application looks for well known ads domains (e.g. example.ads.site.com) and replaces the domains with invalid domains. Thus, for example, an application instead to do an http request to `example.ads.site.com/banner.php?size=100` will request an invalid url as `aaaaaaaaaaaaaaa/banner.php?size=100`. For the majority of the apps this should mean that the app will not display any ads. However, some apps can crash, so it doesn't work always. 7 | ### Requirements 8 | Purify can edit the `classes.dex` file inside an apk, it will produce a new *purified* apk containing the same (old) signature. You can try to install it, however probably you will get an error during the installation asserting that the package is corrupted. A valid apk **must be signed**, otherwise you can't install it, so you need to use also an apk signer to correctly sign the application. I recommend the open source [ZipSigner](https://play.google.com/store/apps/details?id=kellinwood.zipsigner2). Purify requires Android 4.2 or higher. 9 | 10 | #### License 11 | GPLv3 12 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 25 5 | buildToolsVersion "25.0.3" 6 | defaultConfig { 7 | applicationId "com.android.purify" 8 | minSdkVersion 17 9 | targetSdkVersion 25 10 | versionCode 1 11 | versionName "1.0" 12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 13 | } 14 | buildTypes { 15 | release { 16 | minifyEnabled false 17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 18 | } 19 | } 20 | } 21 | 22 | dependencies { 23 | compile fileTree(dir: 'libs', include: ['*.jar']) 24 | androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { 25 | exclude group: 'com.android.support', module: 'support-annotations' 26 | }) 27 | compile 'com.android.support:appcompat-v7:25.3.1' 28 | compile 'com.android.support.constraint:constraint-layout:1.0.2' 29 | testCompile 'junit:junit:4.12' 30 | } 31 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # By default, the flags in this file are appended to flags specified 3 | # in /home/greg/Android/Sdk/tools/proguard/proguard-android.txt 4 | # You can edit the include path and order by changing the proguardFiles 5 | # directive in build.gradle. 6 | # 7 | # For more details, see 8 | # http://developer.android.com/guide/developing/tools/proguard.html 9 | 10 | # Add any project specific keep options here: 11 | 12 | # If your project uses WebView with JS, uncomment the following 13 | # and specify the fully qualified class name to the JavaScript interface 14 | # class: 15 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 16 | # public *; 17 | #} 18 | 19 | # Uncomment this to preserve the line number information for 20 | # debugging stack traces. 21 | #-keepattributes SourceFile,LineNumberTable 22 | 23 | # If you keep the line number information, uncomment this to 24 | # hide the original source file name. 25 | #-renamesourcefileattribute SourceFile 26 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/android/purify/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.android.purify; 2 | 3 | import android.content.Context; 4 | import android.support.test.InstrumentationRegistry; 5 | import android.support.test.runner.AndroidJUnit4; 6 | 7 | import org.junit.Test; 8 | import org.junit.runner.RunWith; 9 | 10 | import static org.junit.Assert.*; 11 | 12 | /** 13 | * Instrumentation test, which will execute on an Android device. 14 | * 15 | * @see Testing documentation 16 | */ 17 | @RunWith(AndroidJUnit4.class) 18 | public class ExampleInstrumentedTest { 19 | @Test 20 | public void useAppContext() throws Exception { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.android.purify", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /app/src/main/java/com/android/purify/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.android.purify; 2 | 3 | import android.Manifest; 4 | import android.content.Intent; 5 | import android.net.Uri; 6 | import android.os.Handler; 7 | import android.os.Message; 8 | import android.support.v4.app.ActivityCompat; 9 | import android.support.v7.app.AppCompatActivity; 10 | import android.os.Bundle; 11 | import android.util.Log; 12 | import android.view.View; 13 | import android.widget.TextView; 14 | import android.widget.Toast; 15 | 16 | import com.android.purify.util.FileUtil; 17 | import com.android.purify.util.ReplacingInputStream; 18 | 19 | import java.io.BufferedOutputStream; 20 | import java.io.ByteArrayInputStream; 21 | import java.io.File; 22 | import java.io.FileOutputStream; 23 | import java.io.IOException; 24 | import java.io.InputStream; 25 | import java.net.URISyntaxException; 26 | 27 | public class MainActivity extends AppCompatActivity { 28 | 29 | private static final int FILE_SELECT_CODE = 0; 30 | private String apkPath; 31 | private TextView apkName; 32 | private TextView txtLog; 33 | 34 | @Override 35 | protected void onCreate(Bundle savedInstanceState) { 36 | super.onCreate(savedInstanceState); 37 | setContentView(R.layout.activity_main); 38 | apkName = (TextView)findViewById(R.id.txtApkPath); 39 | txtLog = (TextView)findViewById(R.id.txtLog); 40 | } 41 | 42 | public void onBtnSelectClick(View v) { 43 | ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); 44 | showFileChooser(); 45 | } 46 | 47 | public void onBtnPurifyClick(View v) { 48 | if ((apkPath == null) || (apkPath.equals(""))) { 49 | Toast.makeText(this, "Please select an apk first", Toast.LENGTH_SHORT).show(); 50 | return; 51 | } 52 | final String outDir = this.getExternalCacheDir().getPath() + "/purifytmp/"; 53 | txtLog.setText(""); 54 | final Handler handler = new Handler(){ 55 | @Override 56 | public void handleMessage(Message msg) { 57 | txtLog.append((String) msg.obj); 58 | super.handleMessage(msg); 59 | } 60 | }; 61 | Purify p = new Purify(apkPath, outDir, handler); 62 | p.purifyApk(); 63 | } 64 | 65 | private void showFileChooser() { 66 | Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 67 | intent.setType("*/*"); 68 | intent.addCategory(Intent.CATEGORY_OPENABLE); 69 | 70 | try { 71 | startActivityForResult( 72 | Intent.createChooser(intent, "Select an APK to purify"), 73 | FILE_SELECT_CODE); 74 | } catch (android.content.ActivityNotFoundException ex) { 75 | // Potentially direct the user to the Market with a Dialog 76 | Toast.makeText(this, "Please install a File Manager.", 77 | Toast.LENGTH_SHORT).show(); 78 | } 79 | } 80 | 81 | @Override 82 | protected void onActivityResult(int requestCode, int resultCode, Intent data) { 83 | switch (requestCode) { 84 | case FILE_SELECT_CODE: 85 | if (resultCode == RESULT_OK) { 86 | // Get the Uri of the selected file 87 | Uri uri = data.getData(); 88 | Log.d("purify", uri.toString()); 89 | // Get the path 90 | try { 91 | apkPath = FileUtil.getPath(this, uri); 92 | apkName.setText(apkPath.substring(apkPath.lastIndexOf('/')+1)); 93 | } catch (URISyntaxException e) { 94 | Toast.makeText(this, "Error: invalid path", 95 | Toast.LENGTH_SHORT).show(); 96 | } 97 | } 98 | break; 99 | } 100 | super.onActivityResult(requestCode, resultCode, data); 101 | } 102 | 103 | 104 | } 105 | -------------------------------------------------------------------------------- /app/src/main/java/com/android/purify/Purify.java: -------------------------------------------------------------------------------- 1 | package com.android.purify; 2 | 3 | import android.os.Handler; 4 | import android.os.Message; 5 | import android.util.Log; 6 | 7 | import com.android.purify.util.FileUtil; 8 | import com.android.purify.util.ReplacingInputStream; 9 | 10 | import java.io.BufferedOutputStream; 11 | import java.io.ByteArrayInputStream; 12 | import java.io.File; 13 | import java.io.FileOutputStream; 14 | import java.io.IOException; 15 | import java.io.InputStream; 16 | 17 | public class Purify { 18 | 19 | private String outDir; 20 | private String apkPath; 21 | private Handler output; 22 | 23 | public Purify(String apkPath, String outDir, Handler output) { 24 | this.apkPath = apkPath; 25 | this.outDir = outDir; 26 | this.output = output; 27 | } 28 | 29 | private void print(String text) { 30 | Message msg = this.output.obtainMessage(); 31 | msg.obj = text; 32 | this.output.sendMessage(msg); 33 | } 34 | 35 | public void purifyApk() { 36 | final File out = new File(outDir); 37 | out.mkdirs(); 38 | File apk = new File(apkPath); 39 | if (apk.exists()) { 40 | print("Please wait...\n"); 41 | print("Extracting APK..."); 42 | Thread worker = new Thread(){ 43 | @Override 44 | public void run() { 45 | //Step 1 - Unzip the apk 46 | if (FileUtil.unpackZip(outDir, apkPath)) { 47 | print("OK\n"); 48 | } else { 49 | print("FAILED\n"); 50 | return; 51 | } 52 | //Step 2 - Edit classes.dex to remove ads 53 | print("Removing ads urls..."); 54 | try { 55 | removeAds(outDir + "classes.dex"); 56 | print("OK\n"); 57 | } catch (Exception e) { 58 | print("FAILED\n"); 59 | } 60 | //Step 3 - Create the apk (i.e. a jar archive) 61 | //Remove previous signatures [disabled] 62 | //FileUtil.deleteRecursive(new File(outDir + "/META-INF")); 63 | print("Creating new apk..."); 64 | String newApkPath = apkPath+"-purified.apk"; 65 | if (createNewApk(outDir, newApkPath)) { 66 | print("OK\n"); 67 | } else { 68 | print("FAILED\n"); 69 | return; 70 | } 71 | //TODO: Step 4 - Sign the app [external, not implemented here] 72 | //Clear temporary files 73 | FileUtil.deleteRecursive(out); 74 | print("Finish! The APK is purified!\nSign and reinstall it.\n"); 75 | print("New APK exported into:\n" + newApkPath); 76 | } 77 | }; 78 | worker.start(); 79 | } else { 80 | print("Invalid apk:\n" + apkPath); 81 | } 82 | } 83 | 84 | private void removeAds(String path) throws IOException { 85 | String[] domains = {"googleads.g.doubleclick.net", "mobileads.google.com"}; 86 | Log.d("purify","Removing ads from "+path); 87 | for (String domain : domains) { 88 | File file = new File(path); 89 | byte[] bytearr = FileUtil.file2bytearray(file); 90 | ByteArrayInputStream bis = new ByteArrayInputStream(bytearr); 91 | String replacementString = ""; 92 | for (int i = 0; i < domain.length(); i++) replacementString += "a"; 93 | byte[] search = domain.getBytes(); 94 | byte[] replacement = replacementString.getBytes(); 95 | InputStream ris = new ReplacingInputStream(bis, search, replacement); 96 | BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(path)); 97 | 98 | int b; 99 | while (-1 != (b = ris.read())) 100 | bos.write(b); 101 | 102 | bos.close(); 103 | 104 | } 105 | } 106 | 107 | /* An apk is just a jar file */ 108 | private boolean createNewApk(String source, String destination) { 109 | return FileUtil.createJarFile(source, destination); 110 | } 111 | } 112 | -------------------------------------------------------------------------------- /app/src/main/java/com/android/purify/util/FileUtil.java: -------------------------------------------------------------------------------- 1 | package com.android.purify.util; 2 | 3 | import android.annotation.SuppressLint; 4 | import android.content.ContentUris; 5 | import android.content.Context; 6 | import android.database.Cursor; 7 | import android.net.Uri; 8 | import android.os.Build; 9 | import android.os.Environment; 10 | import android.provider.DocumentsContract; 11 | import android.provider.MediaStore; 12 | import android.util.Log; 13 | 14 | import java.io.BufferedInputStream; 15 | import java.io.BufferedOutputStream; 16 | import java.io.File; 17 | import java.io.FileInputStream; 18 | import java.io.FileNotFoundException; 19 | import java.io.FileOutputStream; 20 | import java.io.IOException; 21 | import java.io.InputStream; 22 | import java.net.URISyntaxException; 23 | import java.util.jar.Attributes; 24 | import java.util.jar.JarEntry; 25 | import java.util.jar.JarOutputStream; 26 | import java.util.jar.Manifest; 27 | import java.util.zip.ZipEntry; 28 | import java.util.zip.ZipInputStream; 29 | import java.util.zip.ZipOutputStream; 30 | 31 | /** 32 | * Created by Aki on 1/7/2017. 33 | */ 34 | 35 | public class FileUtil { 36 | /* 37 | * Gets the file path of the given Uri. 38 | */ 39 | @SuppressLint("NewApi") 40 | public static String getPath(Context context, Uri uri) throws URISyntaxException { 41 | final boolean needToCheckUri = Build.VERSION.SDK_INT >= 19; 42 | String selection = null; 43 | String[] selectionArgs = null; 44 | // Uri is different in versions after KITKAT (Android 4.4), we need to 45 | // deal with different Uris. 46 | if (needToCheckUri && DocumentsContract.isDocumentUri(context.getApplicationContext(), uri)) { 47 | if (isExternalStorageDocument(uri)) { 48 | final String docId = DocumentsContract.getDocumentId(uri); 49 | final String[] split = docId.split(":"); 50 | return Environment.getExternalStorageDirectory() + "/" + split[1]; 51 | } else if (isDownloadsDocument(uri)) { 52 | final String id = DocumentsContract.getDocumentId(uri); 53 | uri = ContentUris.withAppendedId( 54 | Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); 55 | } else if (isMediaDocument(uri)) { 56 | final String docId = DocumentsContract.getDocumentId(uri); 57 | final String[] split = docId.split(":"); 58 | final String type = split[0]; 59 | if ("image".equals(type)) { 60 | uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; 61 | } else if ("video".equals(type)) { 62 | uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; 63 | } else if ("audio".equals(type)) { 64 | uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 65 | } 66 | selection = "_id=?"; 67 | selectionArgs = new String[]{split[1]}; 68 | } 69 | } 70 | if ("content".equalsIgnoreCase(uri.getScheme())) { 71 | String[] projection = {MediaStore.Images.Media.DATA}; 72 | Cursor cursor = null; 73 | try { 74 | cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); 75 | int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 76 | if (cursor.moveToFirst()) { 77 | return cursor.getString(column_index); 78 | } 79 | } catch (Exception e) { 80 | } 81 | } else if ("file".equalsIgnoreCase(uri.getScheme())) { 82 | return uri.getPath(); 83 | } 84 | return null; 85 | } 86 | 87 | 88 | /** 89 | * @param uri The Uri to check. 90 | * @return Whether the Uri authority is ExternalStorageProvider. 91 | */ 92 | public static boolean isExternalStorageDocument(Uri uri) { 93 | return "com.android.externalstorage.documents".equals(uri.getAuthority()); 94 | } 95 | 96 | /** 97 | * @param uri The Uri to check. 98 | * @return Whether the Uri authority is DownloadsProvider. 99 | */ 100 | public static boolean isDownloadsDocument(Uri uri) { 101 | return "com.android.providers.downloads.documents".equals(uri.getAuthority()); 102 | } 103 | 104 | /** 105 | * @param uri The Uri to check. 106 | * @return Whether the Uri authority is MediaProvider. 107 | */ 108 | public static boolean isMediaDocument(Uri uri) { 109 | return "com.android.providers.media.documents".equals(uri.getAuthority()); 110 | } 111 | 112 | public static boolean unpackZip(String path, String zipname) { 113 | File zipFile = new File(zipname); 114 | File targetDirectory = new File(path); 115 | try { 116 | ZipInputStream zis = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile))); 117 | ZipEntry ze; 118 | int count; 119 | byte[] buffer = new byte[8192]; 120 | while ((ze = zis.getNextEntry()) != null) { 121 | File file = new File(targetDirectory, ze.getName()); 122 | File dir = ze.isDirectory() ? file : file.getParentFile(); 123 | if (!dir.isDirectory() && !dir.mkdirs()) 124 | throw new FileNotFoundException("Failed to ensure directory: " + 125 | dir.getAbsolutePath()); 126 | if (ze.isDirectory()) 127 | continue; 128 | FileOutputStream fout = new FileOutputStream(file); 129 | try { 130 | while ((count = zis.read(buffer)) != -1) 131 | fout.write(buffer, 0, count); 132 | } finally { 133 | fout.close(); 134 | } 135 | /* if time should be restored as well 136 | long time = ze.getTime(); 137 | if (time > 0) 138 | file.setLastModified(time); 139 | */ 140 | } 141 | zis.close(); 142 | } catch (Exception e) { 143 | Log.e("purify", "Error during unzip: " + e.getMessage()); 144 | return false; 145 | } 146 | 147 | return true; 148 | } 149 | 150 | public static byte[] file2bytearray(File file) { 151 | byte[] b = new byte[(int) file.length()]; 152 | try { 153 | FileInputStream fileInputStream = new FileInputStream(file); 154 | fileInputStream.read(b); 155 | } catch (FileNotFoundException e) { 156 | System.out.println("File Not Found."); 157 | e.printStackTrace(); 158 | } 159 | catch (IOException e1) { 160 | System.out.println("Error Reading The File."); 161 | e1.printStackTrace(); 162 | } 163 | return b; 164 | } 165 | 166 | public static void deleteRecursive(File fileOrDirectory) { 167 | if (fileOrDirectory.isDirectory()) 168 | for (File child : fileOrDirectory.listFiles()) 169 | deleteRecursive(child); 170 | 171 | fileOrDirectory.delete(); 172 | } 173 | 174 | public static boolean createJarFile(String path, String destination) { 175 | try { 176 | JarOutputStream target = new JarOutputStream(new FileOutputStream(destination)); 177 | File inputPath = new File(path); 178 | File[] fileList = inputPath.listFiles(); 179 | for (File file : fileList) { 180 | add2jar(file, target, path.length()); 181 | } 182 | target.close(); 183 | return true; 184 | } catch (Exception e) { 185 | Log.d("purify", "Error during jar creation: " + e.getMessage()); 186 | return false; 187 | } 188 | } 189 | 190 | private static void add2jar(File source, JarOutputStream target, int basePathLength) throws IOException 191 | { 192 | BufferedInputStream in = null; 193 | try 194 | { 195 | if (source.isDirectory()) 196 | { 197 | String name = source.getPath().replace("\\", "/"); 198 | if (!name.isEmpty()) 199 | { 200 | if (!name.endsWith("/")) 201 | name += "/"; 202 | JarEntry entry = new JarEntry(name); 203 | entry.setTime(source.lastModified()); 204 | target.putNextEntry(entry); 205 | target.closeEntry(); 206 | } 207 | for (File nestedFile: source.listFiles()) 208 | add2jar(nestedFile, target, basePathLength); 209 | return; 210 | } 211 | 212 | String unmodifiedFilePath = source.getPath(); 213 | String relativePath = unmodifiedFilePath.substring(basePathLength); 214 | JarEntry entry = new JarEntry(relativePath); 215 | entry.setTime(source.lastModified()); 216 | target.putNextEntry(entry); 217 | in = new BufferedInputStream(new FileInputStream(source)); 218 | 219 | byte[] buffer = new byte[1024]; 220 | while (true) 221 | { 222 | int count = in.read(buffer); 223 | if (count == -1) 224 | break; 225 | target.write(buffer, 0, count); 226 | } 227 | target.closeEntry(); 228 | } 229 | finally 230 | { 231 | if (in != null) 232 | in.close(); 233 | } 234 | } 235 | } -------------------------------------------------------------------------------- /app/src/main/java/com/android/purify/util/ReplacingInputStream.java: -------------------------------------------------------------------------------- 1 | package com.android.purify.util; 2 | import java.io.*; 3 | import java.util.*; 4 | 5 | public class ReplacingInputStream extends FilterInputStream { 6 | 7 | LinkedList inQueue = new LinkedList(); 8 | LinkedList outQueue = new LinkedList(); 9 | final byte[] search, replacement; 10 | 11 | public ReplacingInputStream(InputStream in, 12 | byte[] search, 13 | byte[] replacement) { 14 | super(in); 15 | this.search = search; 16 | this.replacement = replacement; 17 | } 18 | 19 | private boolean isMatchFound() { 20 | Iterator inIter = inQueue.iterator(); 21 | for (int i = 0; i < search.length; i++) 22 | if (!inIter.hasNext() || search[i] != inIter.next()) 23 | return false; 24 | return true; 25 | } 26 | 27 | private void readAhead() throws IOException { 28 | // Work up some look-ahead. 29 | while (inQueue.size() < search.length) { 30 | int next = super.read(); 31 | inQueue.offer(next); 32 | if (next == -1) 33 | break; 34 | } 35 | } 36 | 37 | @Override 38 | public int read() throws IOException { 39 | // Next byte already determined. 40 | if (outQueue.isEmpty()) { 41 | readAhead(); 42 | 43 | if (isMatchFound()) { 44 | for (int i = 0; i < search.length; i++) 45 | inQueue.remove(); 46 | 47 | for (byte b : replacement) 48 | outQueue.offer((int) b); 49 | } else 50 | outQueue.add(inQueue.remove()); 51 | } 52 | 53 | return outQueue.remove(); 54 | } 55 | 56 | // TODO: Override the other read methods. 57 | } 58 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 8 | 9 | 22 | 23 |