Java tutorial
/* * This file is part of Sponge, licensed under the MIT License (MIT). * * Copyright (c) SpongePowered <https://www.spongepowered.org> * Copyright (c) contributors * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package org.spongepowered.server.launch.transformer.deobf; import static org.objectweb.asm.Opcodes.ASM5; import com.google.common.base.Throwables; import com.google.common.collect.ImmutableBiMap; import com.google.common.collect.ImmutableMap; import com.google.common.collect.ImmutableTable; import com.google.common.collect.Maps; import net.minecraft.launchwrapper.IClassNameTransformer; import net.minecraft.launchwrapper.Launch; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassVisitor; import org.objectweb.asm.commons.ClassRemapper; import org.objectweb.asm.tree.ClassNode; import org.objectweb.asm.tree.FieldNode; import org.spongepowered.server.launch.transformer.deobf.reader.SrgReader; import java.io.IOException; import java.net.URL; import java.util.HashMap; import java.util.HashSet; import java.util.Map; import java.util.Set; import javax.annotation.Nullable; public final class NotchDeobfuscationTransformer extends DeobfuscationTransformer implements IClassNameTransformer { private final ImmutableBiMap<String, String> classes; private final ImmutableTable<String, String, String> rawFields; private final ImmutableTable<String, String, String> rawMethods; private final Map<String, Map<String, String>> fields; private final Map<String, Map<String, String>> methods; private final Set<String> loadedClasses = new HashSet<>(); public NotchDeobfuscationTransformer() throws IOException { URL mappings = (URL) Launch.blackboard.get("vanilla.srg_mappings"); SrgReader reader = new SrgReader(); reader.read(mappings); this.classes = reader.getClasses(); this.rawFields = reader.getFields(); this.rawMethods = reader.getMethods(); this.fields = Maps.newHashMapWithExpectedSize(this.rawFields.size()); this.methods = Maps.newHashMapWithExpectedSize(this.rawMethods.size()); } @Override public String map(String className) { String name = this.classes.get(className); if (name != null) { return name; } // We may have no name for the inner class directly, but it should be still part of the outer class int innerClassPos = className.lastIndexOf('$'); if (innerClassPos >= 0) { return map(className.substring(0, innerClassPos)).concat(className.substring(innerClassPos)); } return className; // Unknown class } @Override public String unmap(String className) { String name = this.classes.inverse().get(className); if (name != null) { return name; } // We may have no name for the inner class directly, but it should be still part of the outer class int innerClassPos = className.lastIndexOf('$'); if (innerClassPos >= 0) { return unmap(className.substring(0, innerClassPos)).concat(className.substring(innerClassPos)); } return className; // Unknown class } @Override public String mapFieldName(String owner, String fieldName, String desc) { Map<String, String> fields = getFieldMap(owner); if (fields != null) { String name = fields.get(fieldName + ':' + desc); if (name != null) { return name; } } return fieldName; } @Nullable private Map<String, String> getFieldMap(String owner) { Map<String, String> result = this.fields.get(owner); if (result != null) { return result; } loadSuperMaps(owner); return this.fields.get(owner); } @Override public String mapMethodName(String owner, String methodName, String desc) { Map<String, String> methods = getMethodMap(owner); if (methods != null) { String name = methods.get(methodName.concat(desc)); if (name != null) { return name; } } return methodName; } @Nullable private Map<String, String> getMethodMap(String owner) { Map<String, String> result = this.methods.get(owner); if (result != null) { return result; } loadSuperMaps(owner); return this.methods.get(owner); } @Override public String mapSrgMethodIdentifier(String identifier) { return identifier; } @Override public String remapClassName(String className) { return map(className.replace('.', '/')).replace('/', '.'); } @Override public String unmapClassName(String className) { return unmap(className.replace('.', '/')).replace('/', '.'); } private void loadSuperMaps(String name) { if (loadedClasses.contains(name)) { return; } loadedClasses.add(name); byte[] bytes; try { bytes = Launch.classLoader.getClassBytes(name); } catch (IOException e) { throw Throwables.propagate(e); } if (bytes != null) { ClassReader reader = new ClassReader(bytes); createSuperMaps(reader, name, reader.getSuperName(), reader.getInterfaces()); } } private void addInheritedMembers(String parent, Map<String, String> fields, Map<String, String> methods) { loadSuperMaps(parent); Map<String, String> m; m = this.fields.get(parent); if (m != null) { fields.putAll(m); } m = this.methods.get(parent); if (m != null) { methods.putAll(m); } } private void createSuperMaps(ClassReader reader, String name, @Nullable String superName, @Nullable String[] interfaces) { loadedClasses.add(name); Map<String, String> fields = new HashMap<>(); Map<String, String> methods = new HashMap<>(); if (superName != null) { addInheritedMembers(superName, fields, methods); } if (interfaces != null) { for (String parent : interfaces) { addInheritedMembers(parent, fields, methods); } } Map<String, String> raw = this.rawFields.row(name); if (!raw.isEmpty()) { // Resolve field descriptors ClassNode classNode = new ClassNode(); reader.accept(classNode, ClassReader.SKIP_CODE | ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES); for (FieldNode fieldNode : classNode.fields) { String newName = raw.get(fieldNode.name); if (newName != null) { fields.put(fieldNode.name + ':' + fieldNode.desc, newName); } } } methods.putAll(this.rawMethods.row(name)); this.fields.put(name, ImmutableMap.copyOf(fields)); this.methods.put(name, ImmutableMap.copyOf(methods)); } @Override ClassVisitor createClassRemapper(ClassReader reader, ClassVisitor cv) { return new NotchClassRemapper(reader, cv); } private class NotchClassRemapper extends ClassRemapper { private final ClassReader reader; private NotchClassRemapper(ClassReader reader, ClassVisitor cv) { super(ASM5, cv, NotchDeobfuscationTransformer.this); this.reader = reader; } @Override public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) { createSuperMaps(this.reader, name, superName, interfaces); super.visit(version, access, name, signature, superName, interfaces); } } }