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PatchRelaunchClassLoader.java
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PatchRelaunchClassLoader.java
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package nallar.patched.forge;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import cpw.mods.fml.relauncher.FMLRelaunchLog;
import cpw.mods.fml.relauncher.IClassTransformer;
import cpw.mods.fml.relauncher.RelaunchClassLoader;
import nallar.tickthreading.Log;
import nallar.unsafe.UnsafeUtil;
import sun.misc.URLClassPath;
public abstract class PatchRelaunchClassLoader extends RelaunchClassLoader {
private static final ThreadLocal<byte[]> buffer = new ThreadLocal<byte[]>();
private static final PrintStream err = new PrintStream(new FileOutputStream(FileDescriptor.err));
private static volatile Map<String, byte[]> replacedClasses;
private File minecraftdir;
private File patchedModsFolder;
private URLClassPath ucp;
private Set<String> patchedURLs;
private static void log(Level level, Throwable t, String message, Object... data) {
try {
FMLRelaunchLog.log(level, t, message, data);
} catch (Throwable t_) {
t_.printStackTrace(err);
}
}
public PatchRelaunchClassLoader(URL[] sources) {
super(sources);
}
private static File locationOf(Class clazz) {
String path = clazz.getProtectionDomain().getCodeSource().getLocation().getPath();
path = path.contains("!") ? path.substring(0, path.lastIndexOf('!')) : path;
if (!path.isEmpty() && path.charAt(0) == '/') {
path = "file:" + path;
}
try {
return new File(new URL(path).toURI());
} catch (Exception e) {
Log.severe("", e);
return new File(path);
}
}
public void construct() {
try {
patchedURLs = new HashSet<String>();
Field field = URLClassLoader.class.getDeclaredField("ucp");
field.setAccessible(true);
Field modifiersField = Field.class.getDeclaredField("modifiers");
modifiersField.setAccessible(true);
modifiersField.setInt(field, (field.getModifiers() & ~Modifier.FINAL) & ~Modifier.PRIVATE);
ucp = (URLClassPath) field.get(this);
minecraftdir = new File(".").getAbsoluteFile();
FMLRelaunchLog.info("This server is patched with @MOD_NAME@ v@MOD_VERSION@ for MC@MC_VERSION@");
log(Level.INFO, null, "Searching for patched mods in minecraft dir " + minecraftdir);
patchedModsFolder = new File(minecraftdir, "patchedMods");
if (!patchedModsFolder.exists()) {
minecraftdir = locationOf(net.minecraft.util.Tuple.class).getParentFile();
log(Level.INFO, null, "Searching for patched mods in minecraft dir " + minecraftdir);
patchedModsFolder = new File(minecraftdir, "patchedMods");
}
boolean foundTT = false;
for (File file : new File(minecraftdir, "mods").listFiles()) {
if (file.getName().toLowerCase().contains("tickthreading") && file.getName().endsWith(".jar")) {
URL toAdd = new URL(file.toURI().toURL().toString().replace("/./", "/"));
if (!sources.contains(toAdd)) {
sources.add(toAdd);
ucp.addURL(toAdd);
}
log(Level.INFO, null, "Added tickthreading jar " + file + " to classpath");
foundTT = true;
}
}
for (URL url : ucp.getURLs()) {
if (url.toString().contains("patchedMods")) {
log(Level.WARNING, null, url.toString().replace("%", "%%") + " is in the classpath, but it appears to be in the patchedMods directory");
}
}
if (!foundTT) {
log(Level.SEVERE, null, "Failed to find TT jar in mods folder - make sure it has 'tickthreading' in its name!");
}
} catch (Throwable t) {
log(Level.SEVERE, t, "Failed to initialise RelaunchClassLoader");
}
}
@Override
public void addURL(URL url) {
if (url.toString().contains("patchedMods")) {
log(Level.WARNING, null, "Adding " + url.toString().replace("%", "%%") + " to classpath when it appears to be in the patchedMods directory");
}
if (sources.contains(url)) {
log(Level.FINE, null, "Attempted to add " + url.toString().replace("%", "%%") + " to classpath twice");
return;
}
ucp.addURL(url);
sources.add(url);
if (replacedClasses == null) {
getReplacementClassBytes("");
}
synchronized (RelaunchClassLoader.class) {
loadPatchedClasses(url, replacedClasses);
}
}
private void loadPatchedClasses(URL url_, Map<String, byte[]> replacedClasses) {
String url;
try {
url = url_.toURI().getPath();
} catch (URISyntaxException e) {
log(Level.SEVERE, e, "Not loading classes from %s, malformed URL.", url_.toString());
return;
}
if (replacedClasses == null) {
log(Level.WARNING, null, "Not loading patched classes in " + url.replace("%", "%%") + ", replacedClasses was not set.");
return;
}
if (!url.isEmpty() && url.charAt(url.length() - 1) == '/') {
url = url.substring(0, url.length() - 1);
}
if (url.isEmpty() || ".".equals(url)) {
log(Level.WARNING, new Throwable(), "Failed to add patched classes from empty URL", url);
return;
}
File patchedModFile;
try {
patchedModFile = new File(patchedModsFolder, url.substring(url.lastIndexOf('/') + 1, url.length()));
if (!patchedURLs.add(patchedModFile.getAbsolutePath())) {
return;
}
if (patchedModsFolder.equals(patchedModFile)) {
throw new Exception("patched mods file = patched mods folder");
}
} catch (Exception e) {
log(Level.SEVERE, e, "Failed to add patched classes in URL %s", url);
return;
}
try {
if (patchedModFile.exists()) {
ZipFile zipFile = new ZipFile(patchedModFile);
try {
Enumeration<ZipEntry> zipEntryEnumeration = (Enumeration<ZipEntry>) zipFile.entries();
int patchedClasses = 0;
while (zipEntryEnumeration.hasMoreElements()) {
ZipEntry zipEntry = zipEntryEnumeration.nextElement();
String name = zipEntry.getName();
if (!name.toLowerCase().endsWith(".class") || replacedClasses.containsKey(name)) {
continue;
}
patchedClasses++;
byte[] contents = readFully(zipFile.getInputStream(zipEntry));
replacedClasses.put(name, contents);
}
if (patchedClasses > 0) {
log(Level.INFO, null, "Loaded " + patchedClasses + " patched classes for " + patchedModFile.getName() + '.');
}
} finally {
zipFile.close();
}
}
} catch (Exception e) {
log(Level.SEVERE, e, "Failed to load patched classes for " + patchedModFile.getName());
}
}
private byte[] getReplacementClassBytes(String classFile) {
try {
Map<String, byte[]> replacedClasses = PatchRelaunchClassLoader.replacedClasses;
if (replacedClasses == null) {
synchronized (RelaunchClassLoader.class) {
replacedClasses = PatchRelaunchClassLoader.replacedClasses;
if (replacedClasses == null && minecraftdir != null) {
replacedClasses = new ConcurrentHashMap<String, byte[]>();
for (URL url_ : sources) {
loadPatchedClasses(url_, replacedClasses);
}
if (patchedModsFolder.isDirectory()) {
File modsFolder = new File(minecraftdir, "mods");
log(Level.INFO, null, "Loading patched mod classes from " + patchedModsFolder);
for (File file : patchedModsFolder.listFiles()) {
if (!new File(modsFolder, file.getName()).exists()) {
log(Level.INFO, null, "Skipping jar %s which is not in the mods folder.", file.toString());
continue;
}
loadPatchedClasses(file.toURI().toURL(), replacedClasses);
}
}
PatchRelaunchClassLoader.replacedClasses = replacedClasses;
}
}
}
if (replacedClasses == null) {
return null;
}
return replacedClasses.get(classFile);
} catch (Throwable t) {
log(Level.SEVERE, t, "Exception getting patched class for " + classFile);
}
return null;
}
@Override
public byte[] getClassBytes(String name) throws IOException {
byte[] data;
if (name.indexOf('.') == -1) {
for (String res : RESERVED) {
if (name.toUpperCase(Locale.ENGLISH).startsWith(res)) {
data = getClassBytes('_' + name);
if (data != null) {
return data;
}
}
}
}
InputStream classStream = null;
try {
URL classResource = findResource(name.replace('.', '/') + ".class");
if (classResource == null) {
if (DEBUG_CLASSLOADING) {
FMLRelaunchLog.finest("Failed to find class resource %s", name.replace('.', '/') + ".class");
}
return null;
}
classStream = classResource.openStream();
if (DEBUG_CLASSLOADING) {
FMLRelaunchLog.finest("Loading class %s from resource %s", name, classResource.toString());
}
data = readFully(classStream);
byte[] data2 = getReplacementClassBytes(name.replace('.', '/') + ".class");
return data2 == null ? data : data2;
} finally {
if (classStream != null) {
try {
classStream.close();
} catch (IOException ignored) {
}
}
}
}
@Override
protected byte[] runTransformers(String name, byte[] basicClass) {
if (name.startsWith("nallar.patched") && !name.contains("$")) {
throw UnsafeUtil.throwIgnoreChecked(new ClassNotFoundException("Don't load these classes, they will slow down access to the classes they patch as the JVM will have to lookup methods"));
}
if (basicClass == null && DEBUG_CLASSLOADING) {
FMLRelaunchLog.log(Level.WARNING, "Could not find the class " + name + ". This is not necessarily an issue.");
}
for (IClassTransformer transformer : transformers) {
try {
byte[] oldClass = basicClass;
basicClass = transformer.transform(name, basicClass);
if (basicClass == null && oldClass != null) {
basicClass = oldClass;
FMLRelaunchLog.severe(transformer.getClass() + " returned a null class during transformation, ignoring.");
}
} catch (Throwable throwable) {
String message = throwable.getMessage();
if (message != null && message.contains("for invalid side")) {
throw UnsafeUtil.throwIgnoreChecked(throwable);
} else if (basicClass != null || DEBUG_CLASSLOADING) {
FMLRelaunchLog.log((DEBUG_CLASSLOADING && basicClass != null) ? Level.WARNING : Level.FINE, throwable, "Failed to transform " + name);
}
}
}
return basicClass;
}
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
@Override
protected byte[] readFully(InputStream stream) {
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream(stream.available());
int readBytes;
byte[] buffer = PatchRelaunchClassLoader.buffer.get();
if (buffer == null) {
buffer = new byte[1048576];
PatchRelaunchClassLoader.buffer.set(buffer);
}
while ((readBytes = stream.read(buffer, 0, buffer.length)) != -1) {
bos.write(buffer, 0, readBytes);
}
return bos.toByteArray();
} catch (Throwable t) {
FMLRelaunchLog.log(Level.SEVERE, t, "Problem loading class");
return EMPTY_BYTE_ARRAY;
}
}
}