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Add Helium backups support #36

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Add Helium backups support #36

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1 change: 1 addition & 0 deletions build.gradle
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ repositories {

dependencies {
compile 'org.bouncycastle:bcprov-jdk15on:1.51'
compile 'org.kamranzafar:jtar:2.3'
}

sourceSets {
Expand Down
67 changes: 65 additions & 2 deletions src/org/nick/abe/AndroidBackup.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
import java.io.ByteArrayOutputStream;
import java.io.Console;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
Expand All @@ -27,6 +28,9 @@
import org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator;
import org.bouncycastle.crypto.params.KeyParameter;

import org.kamranzafar.jtar.TarEntry;
import org.kamranzafar.jtar.TarInputStream;

// mostly lifted off com.android.server.BackupManagerService.java
public class AndroidBackup {

Expand All @@ -50,8 +54,8 @@ public class AndroidBackup {
private AndroidBackup() {
}

public static void extractAsTar(String backupFilename, String filename,
String password) {
private static InputStream getContentInputStream(String backupFilename, String
password) {
try {
InputStream rawInStream = getInputStream(backupFilename);
CipherInputStream cipherStream = null;
Expand Down Expand Up @@ -173,6 +177,16 @@ public static void extractAsTar(String backupFilename, String filename,
InputStream baseStream = isEncrypted ? cipherStream : rawInStream;
InputStream in = isCompressed ? new InflaterInputStream(baseStream)
: baseStream;
return in;
} catch (Exception e) {
throw new RuntimeException(e);
}
}

public static void extractAsTar(String backupFilename, String filename,
String password) {
try {
InputStream in = getContentInputStream(backupFilename, password);
OutputStream out = null;
try {
out = getOutputStream(filename);
Expand Down Expand Up @@ -204,6 +218,55 @@ public static void extractAsTar(String backupFilename, String filename,
}
}

public static void extractHelium(String backupFilename, String outputDirectory, String password) {
InputStream in = getContentInputStream(backupFilename, password);

try {
TarInputStream tis = new TarInputStream(in);

File outputDir = new File(outputDirectory);
outputDir.mkdirs();

TarEntry entry;

while((entry = tis.getNextEntry()) != null) {
if (DEBUG) {
System.err.println(entry.getName());
}

String name = entry.getName();
if (entry.isDirectory())
{
new File(outputDir, entry.getName()).mkdirs();
}
else
{
int lastSlashIndex = name.lastIndexOf("/");
String dironly = name.substring(0, lastSlashIndex);
File destDir = new File(outputDir, dironly);
destDir.mkdirs();
File destFile = new File (destDir, name.substring(lastSlashIndex + 1));

int count;
byte data[] = new byte[2048];
FileOutputStream dest = new FileOutputStream(destFile);

while((count = tis.read(data)) != -1) {
dest.write(data, 0, count);
}

dest.flush();
dest.close();
}
}

tis.close();
} catch (Exception e)
{
throw new RuntimeException(e);
}
}

public static void packTar(String tarFilename, String backupFilename,
String password, boolean isKitKat) {
boolean encrypting = password != null && !"".equals(password);
Expand Down
17 changes: 12 additions & 5 deletions src/org/nick/abe/Main.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,15 +17,12 @@ public static void main(String[] args) {
}

String mode = args[0];
if (!"pack".equals(mode) && !"unpack".equals(mode) && !"pack-kk".equals(mode)) {
if (!"pack".equals(mode) && !"unpack".equals(mode) && !"pack-kk".equals(mode) && !"unpack-helium".equals(mode)) {
usage();

System.exit(1);
}

boolean unpack = "unpack".equals(mode);
String backupFilename = unpack ? args[1] : args[2];
String tarFilename = unpack ? args[2] : args[1];
String password = null;
if (args.length > 3) {
password = args[3];
Expand All @@ -36,9 +33,17 @@ public static void main(String[] args) {
password = System.getenv("ABE_PASSWD");
}

if (unpack) {
if ("unpack".equals(mode)) {
String backupFilename = args[1];
String tarFilename = args[2];
AndroidBackup.extractAsTar(backupFilename, tarFilename, password);
} else if ("unpack-helium".equals(mode)) {
String backupFilename = args[1];
String outputDirectory = args[2];
AndroidBackup.extractHelium(backupFilename, outputDirectory, password);
} else {
String backupFilename = args[2];
String tarFilename = args[1];
boolean isKitKat = "pack-kk".equals(mode);
AndroidBackup.packTar(tarFilename, backupFilename, password, isKitKat);
}
Expand All @@ -49,6 +54,8 @@ private static void usage() {
System.out.println("Usage:");
System.out
.println(" unpack:\tabe unpack\t<backup.ab> <backup.tar> [password]");
System.out
.println(" unpack-helium:\tabe unpack-helium\t<backup.ab> outputDir [password]");
System.out
.println(" pack:\t\tabe pack\t<backup.tar> <backup.ab> [password]");
System.out
Expand Down