Initial commit

.gitignore

@@ -0,0 +1,30 @@
+# Eclipse stuff
+.classpath
+.project
+.settings/
+
+# netbeans
+nbproject
+
+# gradle
+.gradle/
+
+# vim
+.*.sw[a-p]
+
+# various other potential build files
+/build/
+/out
+
+# Mac filesystem dust
+.DS_Store
+
+# intellij
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# generated
+/repo/
+/bin/

build.gradle

@@ -0,0 +1,30 @@
+apply plugin: 'java'
+apply plugin: 'eclipse'
+
+repositories {
+    maven {
+        url "https://libraries.minecraft.net/"
+    }
+    mavenCentral()
+}
+
+group = 'org.mcphackers'
+archivesBaseName = 'launchwrapper'
+version = '1.0'
+sourceCompatibility = 1.6
+
+dependencies {
+    implementation 'org.ow2.asm:asm:9.3'
+    implementation 'org.ow2.asm:asm-tree:9.3'
+    implementation 'org.lwjgl.lwjgl:lwjgl:2.9.3'
+}
+
+task sourcesJar(type: Jar) {
+    classifier = 'sources'
+    from sourceSets.main.allSource
+}
+
+artifacts {
+    archives jar
+    archives sourcesJar
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Jun 20 12:56:50 EDT 2015
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip

gradlew

@@ -0,0 +1,164 @@
+#!/usr/bin/env bash
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn ( ) {
+    echo "$*"
+}
+
+die ( ) {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+esac
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched.
+if $cygwin ; then
+    [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+fi
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >&-
+APP_HOME="`pwd -P`"
+cd "$SAVED" >&-
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+function splitJvmOpts() {
+    JVM_OPTS=("$@")
+}
+eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
+
+exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"

gradlew.bat

@@ -0,0 +1,90 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windowz variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+if "%@eval[2+2]" == "4" goto 4NT_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+goto execute
+
+:4NT_args
+@rem Get arguments from the 4NT Shell from JP Software
+set CMD_LINE_ARGS=%$
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

src/main/java/org/mcphackers/launchwrapper/AppletWrapper.java

@@ -0,0 +1,62 @@
+package org.mcphackers.launchwrapper;
+
+import java.applet.Applet;
+import java.applet.AppletStub;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class AppletWrapper extends Applet implements AppletStub {
+    private static final long serialVersionUID = 1L;
+    
+    private Object instance;
+    private LaunchTarget launchTarget;
+    
+    public AppletWrapper(LaunchTarget launchTarget) {
+    	this.launchTarget = launchTarget;
+	}
+    
+    public void setInstance(Object instance) {
+    	this.instance = instance;
+    }
+
+    public void appletResize(int width, int height) {
+    	if(instance != null) {
+	    	launchTarget.setWidth(instance, width);
+	    	launchTarget.setHeight(instance, height);
+    	}
+    }
+
+    @Override
+    public boolean isActive() {
+        return true;
+    }
+
+    @Override
+    public URL getDocumentBase() {
+        try {
+            return new URL("http://www.minecraft.net/game/");
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public URL getCodeBase() {
+        try {
+            return new URL("http://www.minecraft.net/game/");
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    @Override
+    public String getParameter(String paramName) {
+    	if(paramName.equals("stand-alone")) {
+    		return "true";
+    	}
+        System.err.println("Client asked for parameter: " + paramName);
+        return null;
+    }
+}

src/main/java/org/mcphackers/launchwrapper/Launch.java

@@ -0,0 +1,218 @@
+package org.mcphackers.launchwrapper;
+
+import java.applet.Applet;
+import java.awt.BorderLayout;
+import java.awt.Canvas;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Frame;
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Field;
+
+public class Launch {
+
+	public static final ClassLoader CLASS_LOADER = ClassLoader.getSystemClassLoader();
+	
+	public static final String[] MAIN_CLASSES = {
+			"net.minecraft.client.Minecraft",
+			"com.mojang.minecraft.Minecraft",
+			"com.mojang.minecraft.RubyDung",
+			"com.mojang.rubydung.RubyDung"
+	};
+	public static final String[] MAIN_APPLETS = {
+			"net.minecraft.client.MinecraftApplet",
+			"com.mojang.minecraft.MinecraftApplet"
+	};
+
+
+	public static void main(String[] args) {
+		File gameDir = null;
+		String username = null;
+		String sessionId = null;
+		for(int i = 0; i < args.length; i++) {
+			switch(i) {
+			case 0:
+				username = args[i];
+				break;
+			case 1:
+				sessionId = args[i];
+				break;
+			case 2:
+				gameDir = new File(args[i]);
+				break;
+			}
+		}
+
+		new Launch()
+			.setUser(username, sessionId)
+			.setGameDirectory(gameDir)
+			.setLWJGLFrame(true)
+			.setFullscreen(true)
+			.launch();
+	}
+	
+	private String username, sessionId;
+	private int width, height;
+	private boolean fullscreen;
+	private File gameDir;
+	private String serverIp;
+	private int serverPort;
+	private boolean lwjglFrame;
+	private boolean useMain = true;
+	
+	public Launch() {
+		setUser(null, null);
+		setResolution(854, 480);
+	}
+	
+	public Launch(String username, String sessionId) {
+		this();
+		setUser(username, sessionId);
+	}
+	
+	public Launch setUser(String username, String sessionId) {
+		this.username = username != null ? username : "Player" + System.currentTimeMillis() % 1000L;
+		this.sessionId = sessionId != null ? sessionId : "-";
+		return this;
+	}
+	
+	public Launch setServer(String ip, int port) {
+		this.serverIp = ip;
+		this.serverPort = port;
+		return this;
+	}
+	
+	public Launch setResolution(int w, int h) {
+		this.width = w;
+		this.height = h;
+		return this;
+	}
+	
+	public Launch setFullscreen(boolean fullscreen) {
+		this.fullscreen = fullscreen;
+		return this;
+	}
+	
+	public Launch setGameDirectory(File file) {
+		this.gameDir = file;
+		return this;
+	}
+	
+	public Launch setLWJGLFrame(boolean f) {
+		lwjglFrame = f;
+		return this;
+	}
+	
+	public void launch() {
+		LaunchTarget launchTarget = getLaunchTarget();
+		
+		if(launchTarget == null) {
+			System.err.println("Could not find launch target");
+			return;
+		}
+		if(launchTarget.main != null && useMain && Util.isStatic(launchTarget.mcDir)) {
+			try {
+				Util.setField(null, launchTarget.mcDir, gameDir);
+				launchTarget.main.invoke(null, (Object) new String[] {username, sessionId});
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+			return;
+		}
+		Frame frame = null;
+		Canvas canvas = null;
+		Applet applet = launchTarget.getAppletInstance();
+		boolean useLWJGLFrame = lwjglFrame || !launchTarget.supportsCanvas();
+		if(!useLWJGLFrame) {
+			canvas = new Canvas();
+			applet.setLayout(new BorderLayout());
+			applet.add(canvas, "Center");
+			frame = new Frame("Minecraft");
+			frame.setBackground(Color.BLACK);
+			frame.setLayout(new BorderLayout());
+			frame.add(applet, "Center");
+			canvas.setPreferredSize(new Dimension(width, height));
+			frame.pack();
+			frame.setLocationRelativeTo(null);
+		}
+		AppletWrapper stubApplet = new AppletWrapper(launchTarget);
+		if(applet != null) {
+			applet.setStub(stubApplet);
+		}
+		if(applet != null) {
+			applet.setStub(new AppletWrapper(launchTarget));
+		}
+		Runnable mc = launchTarget.getInstance(frame, canvas, applet, width, height, fullscreen, false);
+		stubApplet.setInstance(mc);
+		if(mc == null) {
+			System.err.println("Could not create Minecraft instance!");
+			return;
+		}
+		Thread mcThread = new Thread(mc, "Minecraft main thread");
+		mcThread.setPriority(10);
+		
+		launchTarget.setAppletMode(mc, false);
+		launchTarget.setUser(mc, username, sessionId);
+		if(gameDir != null && launchTarget.mcDir != null) {
+			Util.setField(mc, launchTarget.mcDir, gameDir);
+		}
+
+		if(serverIp != null) {
+			launchTarget.setServer(mc, serverIp, serverPort);
+		}
+		if(!useLWJGLFrame) {
+			frame.setVisible(true);
+			frame.addWindowListener(launchTarget.getWindowListener(mc, mcThread));
+		}
+		mcThread.start();
+	}
+	
+	public static LaunchTarget getLaunchTarget() {
+		try {
+			Class<? extends Applet> applet = getApplet();
+			LaunchTarget target = new LaunchTarget(getMinecraft(applet), applet);
+			return target;
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+	public static Class<? extends Applet> getApplet() {
+		Class<?> applet = null;
+		for(String main : MAIN_APPLETS) {
+			try {
+				applet = CLASS_LOADER.loadClass(main);
+			}
+			catch (ClassNotFoundException e) {};
+		}
+		return applet == null ? null : applet.asSubclass(Applet.class);
+	}
+	
+	public static Class<?> getMinecraft(Class<?> applet) {
+		Class<?> launchTarget = null;
+		searchMain:
+		for(String main : MAIN_CLASSES) {
+			try {
+				Class<?> cls = CLASS_LOADER.loadClass(main);
+				for(Class<?> cls2 : cls.getInterfaces()) {
+					if(cls2 == Runnable.class) {
+						launchTarget = cls;
+						break searchMain;
+					}
+				}
+			}
+			catch (ClassNotFoundException e) {};
+		}
+		if(launchTarget == null && applet != null) {
+			for(Field field : applet.getDeclaredFields()) {
+				Class<?> type = field.getType();
+				if(type != Canvas.class && type != Thread.class) {
+					launchTarget = type;
+				}
+			}
+		}
+		return launchTarget;
+	}
+	
+}

src/main/java/org/mcphackers/launchwrapper/LaunchTarget.java

@@ -0,0 +1,300 @@
+package org.mcphackers.launchwrapper;
+
+import java.applet.Applet;
+import java.awt.Canvas;
+import java.awt.Component;
+import java.awt.Frame;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.tree.AbstractInsnNode;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.FieldInsnNode;
+import org.objectweb.asm.tree.FieldNode;
+import org.objectweb.asm.tree.LdcInsnNode;
+import org.objectweb.asm.tree.MethodInsnNode;
+import org.objectweb.asm.tree.MethodNode;
+
+public class LaunchTarget {
+	public final Class<?> minecraft;
+	public final Class<? extends Applet> minecraftApplet;
+	public Constructor<?> session;
+	public Field sessionField;
+	public Field running;
+	public Field width;
+	public Field height;
+	public Field mcDir;
+	public Field user;
+	public Method main;
+	private Constructor<?> mcConstruct;
+	
+	public LaunchTarget(Class<?> mc, Class<? extends Applet> mcApplet) throws IOException {
+		minecraft = mc;
+		minecraftApplet = mcApplet;
+        readClasses();
+	}
+	
+	private void readClasses() throws IOException {
+		ClassNode classNode = new ClassNode();
+	    ClassReader classReader = new ClassReader(minecraft.getName());
+	    classReader.accept(classNode, ClassReader.EXPAND_FRAMES);
+        try {
+        	main = minecraft.getMethod("main", new Class[] { String[].class });
+		} catch (Exception e) {
+			// No main method
+		}
+        //MethodNode init = null;
+	    for(MethodNode method : classNode.methods) {
+	    	if("run".equals(method.name) && "()V".equals(method.desc)) {
+	    		AbstractInsnNode insn = method.instructions.getFirst();
+	    		while(insn != null) {
+	    			if(insn.getOpcode() == Opcodes.PUTFIELD) {
+	    				FieldInsnNode putField = (FieldInsnNode)insn;
+	    				if("Z".equals(putField.desc)) {
+	    					try {
+								running = minecraft.getDeclaredField(putField.name);
+								if(!running.isAccessible()) {
+									running.setAccessible(true);
+								}
+							} catch (Exception e) {
+								e.printStackTrace();
+							}
+	    				} else {
+	    					// Stop looking for it, it's hopeless
+	    					break;
+	    				}
+	    			}
+	    			insn = insn.getNext();
+	    		}
+	    	}
+	    	if("<init>".equals(method.name)) {
+	    		//init = method; TODO
+	    	}
+	    }
+	    FieldNode mcDirectory = null;
+	    for(FieldNode field : classNode.fields) {
+	    	if(Type.getDescriptor(File.class).equals(field.desc)) {
+	    		mcDirectory = field; // Possible candidate (Needed for infdev)
+	    		if((field.access & Opcodes.ACC_STATIC) != 0) {
+	    			// Definitely the mc directory
+	    			break;
+	    		}
+	    	}
+	    }
+	    if(mcDirectory != null) {
+			try {
+				mcDir = minecraft.getDeclaredField(mcDirectory.name);
+				if(!mcDir.isAccessible()) {
+					mcDir.setAccessible(true);
+				}
+			} catch (Exception e) {}
+	    }
+		Class<?> minecraftImpl = minecraft;
+		if(minecraftApplet != null) {
+			classNode = new ClassNode();
+		    classReader = new ClassReader(minecraftApplet.getName());
+		    classReader.accept(classNode, ClassReader.EXPAND_FRAMES);
+		    String mcAppletName = minecraftApplet.getName().replace('.', '/');
+		    String mcName = minecraft.getName().replace('.', '/');
+		    String mcDesc = "L" + mcName + ";";
+		    String mcField = null;
+		    for(FieldNode field : classNode.fields) {
+		    	if(mcDesc.equals(field.desc)) {
+		    		mcField = field.name;
+		    	}
+		    }
+	
+		    for(MethodNode method : classNode.methods) {
+		    	if("init".equals(method.name) && "()V".equals(method.desc)) {
+		    		AbstractInsnNode insn = method.instructions.getFirst();
+		    		while(insn != null) {
+		    			if(insn.getOpcode() == Opcodes.PUTFIELD) {
+		    				FieldInsnNode putField = (FieldInsnNode)insn;
+		    				if(mcDesc.equals(putField.desc) && mcAppletName.equals(putField.owner) && putField.name.equals(mcField)) {
+		    					if(putField.getPrevious().getOpcode() == Opcodes.INVOKESPECIAL) {
+		    	    				MethodInsnNode invoke = (MethodInsnNode)putField.getPrevious();
+		    	    				if("<init>".equals(invoke.name)) {
+			    	    				try {
+											minecraftImpl = Launch.CLASS_LOADER.loadClass(invoke.owner.replace('/', '.'));
+										} catch (ClassNotFoundException e) {
+											minecraftImpl = null;
+											e.printStackTrace();
+										}
+		    	    				}
+		    					}
+		    				}
+		    			}
+		    			AbstractInsnNode insn2 = insn;
+		    			if(insn2.getOpcode() == Opcodes.ALOAD) {
+		    				insn2 = insn2.getNext();
+			    			if(insn2 != null && insn2.getOpcode() == Opcodes.LDC && ((LdcInsnNode)insn2).cst.equals("username")) {
+			    				insn2 = insn2.getNext();
+				    			if(insn2 != null && insn2.getOpcode() == Opcodes.INVOKEVIRTUAL) {
+				    				MethodInsnNode invoke = (MethodInsnNode)insn2;
+				    				if(invoke.owner.equals(mcAppletName) && invoke.name.equals("getParameter") && invoke.desc.equals("(Ljava/lang/String;)Ljava/lang/String;")) {
+					    				insn2 = insn2.getNext();
+						    			if(insn2.getOpcode() == Opcodes.ALOAD) {
+						    				insn2 = insn2.getNext();
+							    			if(insn2 != null && insn2.getOpcode() == Opcodes.LDC && ((LdcInsnNode)insn2).cst.equals("sessionid")) {
+							    				insn2 = insn2.getNext();
+								    			if(insn2 != null && insn2.getOpcode() == Opcodes.INVOKEVIRTUAL) {
+								    				invoke = (MethodInsnNode)insn2;
+								    				if(invoke.owner.equals(mcAppletName) && invoke.name.equals("getParameter") && invoke.desc.equals("(Ljava/lang/String;)Ljava/lang/String;")) {
+								    					insn2 = insn2.getNext();
+								    					if(insn2 != null && insn2.getOpcode() == Opcodes.INVOKESPECIAL) {
+										    				invoke = (MethodInsnNode)insn2;
+										    				if(invoke.name.equals("<init>") && invoke.desc.equals("(Ljava/lang/String;Ljava/lang/String;)V")) {
+										    					try {
+																	session = Launch.CLASS_LOADER.loadClass(invoke.owner.replace('/', '.')).getConstructor(String.class, String.class);
+																} catch (Exception e) {
+																	e.printStackTrace();
+																}
+										    				}
+										    				insn2 = insn2.getNext();
+										    				if(insn2 != null && insn2.getOpcode() == Opcodes.PUTFIELD) {
+										    					FieldInsnNode field = (FieldInsnNode)insn2;
+										    					if(field.owner.equals(mcName)) {
+										    						try {
+																		sessionField = minecraft.getDeclaredField(field.name);
+																	} catch (Exception e) {
+																		e.printStackTrace();
+																	}
+										    					}
+										    				}
+								    					}
+								    				}
+								    			}
+							    			}
+						    			}
+				    				}
+				    			}
+			    			}
+		    			}
+		    			insn = insn.getNext();
+		    		}
+		    	}
+		    }
+		}
+	    
+		Constructor<?>[] constructors = minecraftImpl.getConstructors();
+		if(constructors.length >= 1) {
+			mcConstruct = constructors[0];
+		}
+		if(constructors.length > 1) {
+			System.out.println("WARNING: Main class contains more than one constructor!");
+		}
+		
+	}
+
+	public Applet getAppletInstance() {
+		if(minecraftApplet == null) return null;
+		try {
+			Applet appletInstance = minecraftApplet.newInstance();
+			return appletInstance;
+		} catch (Exception e) {
+			e.printStackTrace();
+			return null;
+		}
+	}
+	
+	public boolean supportsCanvas() {
+		return mcConstruct.getParameterTypes().length != 0;
+	}
+
+	public Runnable getInstance(Frame frame, Canvas canvas, Applet applet, int w, int h, boolean fullscreen, boolean appletMode) {
+		//TODO Set appletMode
+		//TODO Resize width and height
+		Class<?>[] types = mcConstruct.getParameterTypes();
+		try {
+			if(types.length == 0) {
+				return (Runnable)mcConstruct.newInstance();
+			}
+			if(types.length == 4 
+				&& types[0] == Canvas.class
+				&& types[1] == int.class
+				&& types[2] == int.class
+				&& types[3] == boolean.class) {
+					return (Runnable)mcConstruct.newInstance(canvas, w, h, fullscreen);
+			}
+			if(types.length == 5 
+				&& types[0] == Canvas.class
+				&& types[1] == minecraftApplet
+				&& types[2] == int.class
+				&& types[3] == int.class
+				&& types[4] == boolean.class) {
+					return (Runnable)mcConstruct.newInstance(canvas, applet, w, h, fullscreen);
+			}
+			if(types.length == 6 
+				&& types[0] == Component.class
+				&& types[1] == Canvas.class
+				&& types[2] == minecraftApplet
+				&& types[3] == int.class
+				&& types[4] == int.class
+				&& types[5] == boolean.class) {
+					return (Runnable)mcConstruct.newInstance(frame, canvas, applet, w, h, fullscreen);
+			}
+			if(types.length == 7 
+				&& types[0] == minecraftApplet
+				&& types[1] == Component.class
+				&& types[2] == Canvas.class
+				&& types[3] == minecraftApplet
+				&& types[4] == int.class
+				&& types[5] == int.class
+				&& types[6] == boolean.class) {
+					return (Runnable)mcConstruct.newInstance(applet, frame, canvas, applet, w, h, fullscreen);
+			}
+		}
+		catch (Exception e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+
+	public WindowListener getWindowListener(final Runnable mc, final Thread thread) {
+		return new WindowAdapter() {
+			public void windowClosing(WindowEvent event) {
+				if(running != null) {
+					Util.setField(mc, running, false);
+					try {
+						thread.join();
+					} catch (InterruptedException e) {
+						e.printStackTrace();
+					}
+				}
+				System.exit(0);
+			}
+		};
+	}
+
+	public void setAppletMode(Object instance, boolean b) {
+		Util.setField(instance, null, b); //FIXME
+	}
+
+	public void setUser(Object instance, String username, String sessionId) {
+		if(session != null && sessionField != null) {
+			try {
+				Util.setField(instance, sessionField, session.newInstance(username, sessionId));
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	public void setServer(Object instance, String serverIp, int serverPort) {
+	}
+
+	public void setWidth(Object instance, int width) {
+	}
+	
+	public void setHeight(Object instance, int height) {
+	}
+}

src/main/java/org/mcphackers/launchwrapper/Util.java

@@ -0,0 +1,21 @@
+package org.mcphackers.launchwrapper;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
+public final class Util {
+	
+	public static void setField(Object instance, Field field, Object value) {
+		if(field != null) {
+			try {
+				field.set(instance, value);
+			}
+			catch (Exception e) { }
+		}
+	}
+	
+	public static boolean isStatic(Field field) {
+		return (field.getModifiers() & Modifier.STATIC) != 0;
+	}
+
+}