/**
* Debug command that deserializes and writes copies of asset files for validation.
*
* @author Nico Bergemann <barracuda415 at yahoo.de>
*/
@Parameters(
commandNames = "debug-asset-test",
commandDescription = "Test asset file deserialization and writing.")
public class DebugAssetTest extends MultiFileCommand {
private static final Logger L = LogUtils.getLogger();
@Override
public void handleFile(Path file) throws IOException {
AssetFile asset = new AssetFile();
asset.load(file);
try {
testDeserialize(asset);
} catch (Throwable t) {
L.log(
Level.WARNING,
"{0} failed deserialization test: {1}",
new Object[] {asset.getSourceFile(), t.getMessage()});
}
try {
testWrite(asset);
} catch (Throwable t) {
L.log(
Level.WARNING,
"{0} failed write test: {1}",
new Object[] {asset.getSourceFile(), t.getMessage()});
}
}
private void testDeserialize(AssetFile asset) throws IOException {
for (ObjectData obj : asset.objects()) {
obj.instance();
}
}
private void testWrite(AssetFile asset) throws IOException {
Path tmpFile = Files.createTempFile("disunity", null);
try {
asset.save(tmpFile);
if (!FileUtils.contentEquals(asset.getSourceFile().toFile(), tmpFile.toFile())) {
throw new IOException("Files are not equal");
}
} finally {
Files.deleteIfExists(tmpFile);
}
}
}
/**
* Extractor for asset files.
*
* @author Nico Bergemann <barracuda415 at yahoo.de>
*/
public class AssetExtractor {
private static final Logger L = LogUtils.getLogger();
/**
* Tries to get the name of an object by deserializing it and looking for the field "m_Name". If
* it exists, return its value.
*
* @param asset asset file
* @param path object path
* @return Name string of the object or null if it doesn't have a name or if the deserialization
* failed.
*/
public static String getObjectName(AssetFile asset, ObjectPath path) {
Deserializer deser = new Deserializer(asset);
String name = null;
try {
UnityObject obj = deser.deserialize(path);
name = obj.getValue("m_Name");
} catch (OutOfMemoryError ex) {
// Deserializer choked on an array size and clogged the heap, try
// to clean up this mess
deser = null;
System.gc();
} catch (Throwable ex) {
}
return name;
}
private final AssetFile asset;
private final Map<String, AssetExtractHandler> extractHandlerMap = new HashMap<>();
private ClassFilter cf;
private Path outputDir;
public AssetExtractor(AssetFile asset) {
this.asset = asset;
addHandler("AudioClip", new AudioClipHandler());
addHandler("Shader", new TextAssetHandler("shader"));
addHandler("SubstanceArchive", new SubstanceArchiveHandler());
addHandler("Texture2D", new Texture2DHandler());
addHandler("Cubemap", new Texture2DHandler());
addHandler("Font", new FontHandler());
addHandler("TextAsset", new TextAssetHandler("txt"));
addHandler("MovieTexture", new MovieTextureHandler());
addHandler("Mesh", new MeshHandler());
}
public final void addHandler(String className, AssetExtractHandler handler) {
handler.setClassName(className);
extractHandlerMap.put(className, handler);
}
public final AssetExtractHandler getHandler(String className) {
return extractHandlerMap.get(className);
}
public final void clearHandlers() {
extractHandlerMap.clear();
}
public Path getOutputDir() {
return outputDir;
}
public void setOutputDir(Path outputDir) {
this.outputDir = outputDir;
}
public ClassFilter getClassFilter() {
return cf;
}
public void setClassFilter(ClassFilter cf) {
this.cf = cf;
}
public void extract(boolean raw) throws IOException {
List<ObjectPath> paths = asset.getPaths();
Deserializer deser = new Deserializer(asset);
for (AssetExtractHandler extractHandler : extractHandlerMap.values()) {
extractHandler.setAssetFile(asset);
extractHandler.setOutputDir(outputDir);
}
for (ObjectPath path : paths) {
// skip filtered classes
if (cf != null && !cf.accept(path)) {
continue;
}
String className = ClassID.getNameForID(path.getClassID(), true);
// write just the serialized object data or parsed and extracted content?
if (raw) {
String assetFileName = String.format("%06d.bin", path.getPathID());
Path classDir = outputDir.resolve(className);
if (Files.notExists(classDir)) {
Files.createDirectories(classDir);
}
Path assetFile = classDir.resolve(assetFileName);
L.log(Level.INFO, "Writing {0} {1}", new Object[] {className, assetFileName});
ByteBuffer bbAsset = asset.getPathBuffer(path);
try {
ByteBufferUtils.save(assetFile, bbAsset);
} catch (Exception ex) {
L.log(Level.WARNING, "Can't write " + path + " to " + assetFile, ex);
}
} else {
AssetExtractHandler handler = getHandler(className);
if (handler != null) {
UnityObject obj;
try {
obj = deser.deserialize(path);
} catch (Exception ex) {
L.log(Level.WARNING, "Can't deserialize " + path, ex);
continue;
}
try {
handler.setObjectPath(path);
handler.extract(obj);
} catch (Exception ex) {
L.log(Level.WARNING, "Can't extract " + path, ex);
}
}
}
}
}
public void split() throws IOException {
List<ObjectPath> pathTable = asset.getPaths();
TypeTree typeTree = asset.getTypeTree();
// assets with just one object can't be split any further
if (pathTable.size() == 1) {
L.warning("Asset doesn't contain sub-assets!");
return;
}
for (ObjectPath path : pathTable) {
// skip filtered classes
if (cf != null && !cf.accept(path)) {
continue;
}
String className = ClassID.getNameForID(path.getClassID(), true);
AssetFile subAsset = new AssetFile();
subAsset.getHeader().setFormat(asset.getHeader().getFormat());
ObjectPath subFieldPath = new ObjectPath();
subFieldPath.setClassID1(path.getClassID1());
subFieldPath.setClassID2(path.getClassID2());
subFieldPath.setLength(path.getLength());
subFieldPath.setOffset(0);
subFieldPath.setPathID(1);
subAsset.getPaths().add(subFieldPath);
TypeTree subTypeTree = subAsset.getTypeTree();
subTypeTree.setEngineVersion(typeTree.getEngineVersion());
subTypeTree.setVersion(-2);
subTypeTree.setFormat(typeTree.getFormat());
subTypeTree.getFields().put(path.getClassID(), typeTree.getFields().get(path.getClassID()));
subAsset.setDataBuffer(asset.getPathBuffer(path));
Path subAssetDir = outputDir.resolve(className);
if (Files.notExists(subAssetDir)) {
Files.createDirectories(subAssetDir);
}
// probe asset name
String subAssetName = getObjectName(asset, path);
if (subAssetName != null) {
// remove any chars that could cause troubles on various file systems
subAssetName = FilenameSanitizer.sanitizeName(subAssetName);
} else {
// use numeric names
subAssetName = String.format("%06d", path.getPathID());
}
subAssetName += ".asset";
Path subAssetFile = subAssetDir.resolve(subAssetName);
if (Files.notExists(subAssetFile)) {
L.log(Level.INFO, "Writing {0}", subAssetFile);
subAsset.save(subAssetFile);
}
}
}
}
/** @author Nico Bergemann <barracuda415 at yahoo.de> */
public class FixReferencesAction extends Action {
private static final Logger L = LogUtils.getLogger();
@Override
public boolean supportsAssets() {
return true;
}
@Override
public boolean supportsAssetBundes() {
return false;
}
@Override
public void processAsset(AssetFile asset) throws IOException {
Path assetFile = asset.getSourceFile();
Path assetDir = assetFile.getParent();
String assetFileName = assetFile.getFileName().toString();
String assetPath;
if (assetDir == null) {
assetPath = "";
} else {
assetPath = assetDir.toAbsolutePath().toString();
assetPath = FilenameUtils.separatorsToUnix(assetPath) + "/";
}
// fix path for all assets with (shared)assets extension
boolean changed = false;
for (AssetRef ref : asset.getReferences()) {
Path refFile = Paths.get(ref.getFilePath());
String refExt = FilenameUtils.getExtension(refFile.getFileName().toString());
if (refExt.endsWith("assets") && Files.notExists(refFile)) {
String filePathOld = ref.getFilePath();
String filePathNew = assetPath + FilenameUtils.getName(ref.getFilePath());
Path refFileNew = Paths.get(filePathNew);
if (Files.exists(refFileNew)) {
L.log(Level.FINE, "Fixed reference: {0} -> {1}", new Object[] {filePathOld, filePathNew});
ref.setFilePath(filePathNew);
changed = true;
} else {
L.log(Level.FINE, "Fixed reference not found: {0}", refFileNew);
}
}
}
if (!changed) {
L.fine("No references changed, skipping saving");
return;
}
// create backup by renaming the original file
Path assetFileBackup = assetFile.resolveSibling(assetFileName + ".bak");
Files.move(assetFile, assetFileBackup, StandardCopyOption.REPLACE_EXISTING);
// save asset
asset.save(assetFile);
}
}