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LaunchClassLoader.java
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LaunchClassLoader.java
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package net.minecraft.launchwrapper;
import cpw.mods.fml.relauncher.FMLRelaunchLog;
import nallar.tickthreading.patcher.PatchHook;
import nallar.unsafe.UnsafeUtil;
import java.io.*;
import java.net.*;
import java.security.*;
import java.util.*;
import java.util.jar.*;
import java.util.jar.Attributes.*;
import java.util.logging.*;
public class LaunchClassLoader extends URLClassLoader {
private IClassTransformer prePatchTransformer;
public static final int BUFFER_SIZE = 1 << 12;
private List<URL> sources;
private ClassLoader parent = getClass().getClassLoader();
private List<IClassTransformer> transformers = new ArrayList<IClassTransformer>(2);
private Map<String, Class<?>> cachedClasses = new HashMap<String, Class<?>>(1000);
private Set<String> invalidClasses = new HashSet<String>(1000);
private Set<String> classLoaderExceptions = new HashSet<String>();
private Set<String> transformerExceptions = new HashSet<String>();
private Map<String, byte[]> resourceCache = new HashMap<String, byte[]>(1000);
private Set<String> negativeResourceCache = new HashSet<String>();
private IClassNameTransformer renameTransformer;
private final ThreadLocal<byte[]> loadBuffer = new ThreadLocal<byte[]>();
private static final String[] RESERVED_NAMES = {"CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9"};
private static final boolean DEBUG = Boolean.parseBoolean(System.getProperty("legacy.debugClassLoading", "false"));
private static final boolean DEBUG_FINER = DEBUG && Boolean.parseBoolean(System.getProperty("legacy.debugClassLoadingFiner", "false"));
private static final boolean DEBUG_SAVE = DEBUG && Boolean.parseBoolean(System.getProperty("legacy.debugClassLoadingSave", "false"));
private static File tempFolder = null;
public static LaunchClassLoader instance;
public LaunchClassLoader(URL[] sources) {
super(sources, null);
instance = this;
this.sources = new ArrayList<URL>(Arrays.asList(sources));
Thread.currentThread().setContextClassLoader(this);
// classloader exclusions
addClassLoaderExclusion("java.");
addClassLoaderExclusion("sun.");
addClassLoaderExclusion("org.lwjgl.");
addClassLoaderExclusion("org.apache.logging.");
addClassLoaderExclusion("net.minecraft.launchwrapper.");
// transformer exclusions
addTransformerExclusion("javax.");
addTransformerExclusion("argo.");
addTransformerExclusion("org.objectweb.asm.");
addTransformerExclusion("com.google.common.");
addTransformerExclusion("org.bouncycastle.");
addTransformerExclusion("net.minecraft.launchwrapper.injector.");
if (DEBUG_SAVE) {
int x = 1;
tempFolder = new File(Launch.minecraftHome, "CLASSLOADER_TEMP");
while (tempFolder.exists() && x <= 10) {
tempFolder = new File(Launch.minecraftHome, "CLASSLOADER_TEMP" + x++);
}
if (tempFolder.exists()) {
LogWrapper.info("DEBUG_SAVE enabled, but 10 temp directories already exist, clean them and try again.");
tempFolder = null;
} else {
LogWrapper.info("DEBUG_SAVE Enabled, saving all classes to \"%s\"", tempFolder.getAbsolutePath().replace('\\', '/'));
tempFolder.mkdirs();
}
}
}
public void registerTransformer(String transformerClassName) {
try {
IClassTransformer transformer = (IClassTransformer) loadClass(transformerClassName).newInstance();
transformers.add(transformer);
if (transformer instanceof IClassNameTransformer && renameTransformer == null) {
renameTransformer = (IClassNameTransformer) transformer;
}
if (transformerClassName.equals("cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer")) {
prePatchTransformer = transformer;
}
} catch (Exception e) {
LogWrapper.log(Level.SEVERE, "Critical problem occurred registering the ASM transformer class %s", transformerClassName);
}
}
public boolean excluded(String name) {
for (final String exception : classLoaderExceptions) {
if (name.startsWith(exception)) {
return true;
}
}
return false;
}
@Override
public Class<?> findClass(final String name) throws ClassNotFoundException {
if (invalidClasses.contains(name)) {
throw new ClassNotFoundException(name);
}
if (excluded(name)) {
return parent.loadClass(name);
}
if (cachedClasses.containsKey(name)) {
return cachedClasses.get(name);
}
for (final String exception : transformerExceptions) {
if (name.startsWith(exception)) {
try {
final Class<?> clazz = super.findClass(name);
cachedClasses.put(name, clazz);
return clazz;
} catch (ClassNotFoundException e) {
invalidClasses.add(name);
throw e;
}
}
}
try {
final String transformedName = transformName(name);
if (cachedClasses.containsKey(transformedName)) {
return cachedClasses.get(transformedName);
}
final String untransformedName = untransformName(name);
final int lastDot = untransformedName.lastIndexOf('.');
final String packageName = lastDot == -1 ? "" : untransformedName.substring(0, lastDot);
final String fileName = untransformedName.replace('.', '/').concat(".class");
URLConnection urlConnection = findCodeSourceConnectionFor(fileName);
CodeSigner[] signers = null;
if (lastDot > -1 && !untransformedName.startsWith("net.minecraft.")) {
if (urlConnection instanceof JarURLConnection) {
final JarURLConnection jarURLConnection = (JarURLConnection) urlConnection;
final JarFile jarFile = jarURLConnection.getJarFile();
if (jarFile != null && jarFile.getManifest() != null) {
final Manifest manifest = jarFile.getManifest();
final JarEntry entry = jarFile.getJarEntry(fileName);
Package pkg = getPackage(packageName);
getClassBytes(untransformedName);
signers = entry.getCodeSigners();
if (pkg == null) {
definePackage(packageName, manifest, jarURLConnection.getJarFileURL());
} else {
if (pkg.isSealed() && !pkg.isSealed(jarURLConnection.getJarFileURL())) {
LogWrapper.severe("The jar file %s is trying to seal already secured path %s", jarFile.getName(), packageName);
} else if (isSealed(packageName, manifest)) {
LogWrapper.severe("The jar file %s has a security seal for path %s, but that path is defined and not secure", jarFile.getName(), packageName);
}
}
}
} else {
Package pkg = getPackage(packageName);
if (pkg == null) {
definePackage(packageName, null, null, null, null, null, null, null);
} else if (pkg.isSealed()) {
LogWrapper.severe("The URL %s is defining elements for sealed path %s", urlConnection.getURL(), packageName);
}
}
}
final byte[] transformedClass = runTransformers(untransformedName, transformedName, getClassBytes(untransformedName));
if (DEBUG_SAVE) {
saveTransformedClass(transformedClass, transformedName);
}
final CodeSource codeSource = urlConnection == null ? null : new CodeSource(urlConnection.getURL(), signers);
final Class<?> clazz = defineClass(transformedName, transformedClass, 0, transformedClass.length, codeSource);
cachedClasses.put(transformedName, clazz);
return clazz;
} catch (Throwable e) {
invalidClasses.add(name);
if (DEBUG) {
LogWrapper.log(Level.FINE, e, "Exception encountered attempting classloading of %s", name);
}
throw new ClassNotFoundException(name, e);
}
}
private void saveTransformedClass(final byte[] data, final String transformedName) {
if (tempFolder == null) {
return;
}
final File outFile = new File(tempFolder, transformedName.replace('.', File.separatorChar) + ".class");
final File outDir = outFile.getParentFile();
if (!outDir.exists()) {
outDir.mkdirs();
}
if (outFile.exists()) {
outFile.delete();
}
try {
LogWrapper.fine("Saving transformed class \"%s\" to \"%s\"", transformedName, outFile.getAbsolutePath().replace('\\', '/'));
final OutputStream output = new FileOutputStream(outFile);
output.write(data);
output.close();
} catch (IOException ex) {
LogWrapper.log(Level.WARNING, ex, "Could not save transformed class \"%s\"", transformedName);
}
}
private String untransformName(final String name) {
if (renameTransformer != null) {
return renameTransformer.unmapClassName(name);
}
return name;
}
private String transformName(final String name) {
if (renameTransformer != null) {
return renameTransformer.remapClassName(name);
}
return name;
}
private boolean isSealed(final String path, final Manifest manifest) {
Attributes attributes = manifest.getAttributes(path);
String sealed = null;
if (attributes != null) {
sealed = attributes.getValue(Name.SEALED);
}
if (sealed == null) {
attributes = manifest.getMainAttributes();
if (attributes != null) {
sealed = attributes.getValue(Name.SEALED);
}
}
return "true".equalsIgnoreCase(sealed);
}
private URLConnection findCodeSourceConnectionFor(final String name) {
final URL resource = findResource(name);
if (resource != null) {
try {
return resource.openConnection();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return null;
}
private byte[] runTransformer(final String name, final String transformedName, byte[] basicClass, final IClassTransformer transformer) {
try {
return transformer.transform(name, transformedName, basicClass);
} catch (Throwable t) {
String message = t.getMessage();
if (message != null && message.contains("for invalid side")) {
throw UnsafeUtil.throwIgnoreChecked(t);
} else if (basicClass != null || DEBUG_FINER) {
FMLRelaunchLog.log((DEBUG_FINER && basicClass != null) ? Level.WARNING : Level.FINE, t, "Failed to transform " + name);
}
return basicClass;
}
}
private byte[] runTransformers(final String name, final String transformedName, byte[] basicClass) {
basicClass = transformUpToSrg(name, transformedName, basicClass);
basicClass = PatchHook.hook(name, transformedName, basicClass);
basicClass = transformAfterSrg(name, transformedName, basicClass);
return basicClass;
}
private byte[] transformUpToSrg(final String name, final String transformedName, byte[] basicClass) {
for (final IClassTransformer transformer : transformers) {
basicClass = runTransformer(name, transformedName, basicClass, transformer);
if (transformer == prePatchTransformer) {
return basicClass;
}
}
throw new RuntimeException("No SRG transformer!");
}
HashMap<String, byte[]> cachedSrgBytes = new HashMap<String, byte[]>();
private byte[] transformAfterSrg(final String name, final String transformedName, byte[] basicClass) {
byte[] cached = cachedSrgBytes.get(transformedName);
if (cached != null) {
return cached;
}
boolean pastSrg = false;
for (final IClassTransformer transformer : transformers) {
if (pastSrg) {
basicClass = runTransformer(name, transformedName, basicClass, transformer);
}
if (transformer == prePatchTransformer) {
pastSrg = true;
}
}
if (!pastSrg) {
throw new RuntimeException("No SRG transformer!");
}
cachedSrgBytes.put(transformedName, basicClass);
return basicClass;
}
public byte[] getSrgBytes(String name) {
final String transformedName = transformName(name);
byte[] cached = cachedSrgBytes.get(transformedName);
if (cached != null) {
return cached;
}
name = untransformName(name);
try {
byte[] bytes = getClassBytes(name);
return transformUpToSrg(name, transformedName, bytes);
} catch (Throwable t) {
throw new RuntimeException(t);
}
}
@Override
public void addURL(final URL url) {
super.addURL(url);
sources.add(url);
}
public List<URL> getSources() {
return sources;
}
private byte[] readFully(InputStream stream) {
try {
byte[] buffer = getOrCreateBuffer();
int read;
int totalLength = 0;
while ((read = stream.read(buffer, totalLength, buffer.length - totalLength)) != -1) {
totalLength += read;
// Extend our buffer
if (totalLength >= buffer.length - 1) {
byte[] newBuffer = new byte[buffer.length + BUFFER_SIZE];
System.arraycopy(buffer, 0, newBuffer, 0, buffer.length);
buffer = newBuffer;
}
}
final byte[] result = new byte[totalLength];
System.arraycopy(buffer, 0, result, 0, totalLength);
return result;
} catch (Throwable t) {
LogWrapper.log(Level.WARNING, t, "Problem loading class");
return new byte[0];
}
}
private byte[] getOrCreateBuffer() {
byte[] buffer = loadBuffer.get();
if (buffer == null) {
loadBuffer.set(new byte[BUFFER_SIZE]);
buffer = loadBuffer.get();
}
return buffer;
}
public List<IClassTransformer> getTransformers() {
return Collections.unmodifiableList(transformers);
}
public void addClassLoaderExclusion(String toExclude) {
classLoaderExceptions.add(toExclude);
}
public void addTransformerExclusion(String toExclude) {
transformerExceptions.add(toExclude);
}
public byte[] getClassBytes(String name) throws IOException {
if (negativeResourceCache.contains(name)) {
return null;
} else if (resourceCache.containsKey(name)) {
return resourceCache.get(name);
}
if (name.indexOf('.') == -1) {
for (final String reservedName : RESERVED_NAMES) {
if (name.toUpperCase(Locale.ENGLISH).startsWith(reservedName)) {
final byte[] data = getClassBytes("_" + name);
if (data != null) {
resourceCache.put(name, data);
return data;
}
}
}
}
InputStream classStream = null;
try {
final String resourcePath = name.replace('.', '/').concat(".class");
final URL classResource = findResource(resourcePath);
if (classResource == null) {
if (DEBUG) LogWrapper.finest("Failed to find class resource %s", resourcePath);
negativeResourceCache.add(name);
return null;
}
classStream = classResource.openStream();
if (DEBUG) LogWrapper.finest("Loading class %s from resource %s", name, classResource.toString());
final byte[] data = readFully(classStream);
resourceCache.put(name, data);
return data;
} finally {
closeSilently(classStream);
}
}
private static void closeSilently(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException ignored) {
}
}
}
public void clearNegativeEntries(Set<String> entriesToClear) {
negativeResourceCache.removeAll(entriesToClear);
}
}