package cpw.mods.fml.common.asm.transformers;
import static org.objectweb.asm.Opcodes.ACC_FINAL;
import static org.objectweb.asm.Opcodes.ACC_PRIVATE;
import static org.objectweb.asm.Opcodes.ACC_PROTECTED;
import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.FieldNode;
import org.objectweb.asm.tree.MethodNode;
import com.google.common.base.Charsets;
import com.google.common.base.Splitter;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Multimap;
import com.google.common.io.LineProcessor;
import com.google.common.io.Resources;
import cpw.mods.fml.relauncher.IClassTransformer;
public class AccessTransformer implements IClassTransformer
{
private static final boolean DEBUG = false;
private class Modifier
{
public String name = "";
public String desc = "";
public int oldAccess = 0;
public int newAccess = 0;
public int targetAccess = 0;
public boolean changeFinal = false;
public boolean markFinal = false;
protected boolean modifyClassVisibility;
private void setTargetAccess(String name)
{
if (name.startsWith("public")) targetAccess = ACC_PUBLIC;
else if (name.startsWith("private")) targetAccess = ACC_PRIVATE;
else if (name.startsWith("protected")) targetAccess = ACC_PROTECTED;
if (name.endsWith("-f"))
{
changeFinal = true;
markFinal = false;
}
else if (name.endsWith("+f"))
{
changeFinal = true;
markFinal = true;
}
}
}
private Multimap<String, Modifier> modifiers = ArrayListMultimap.create();
public AccessTransformer() throws IOException
{
this("fml_at.cfg");
}
protected AccessTransformer(String rulesFile) throws IOException
{
readMapFile(rulesFile);
}
private void readMapFile(String rulesFile) throws IOException
{
File file = new File(rulesFile);
URL rulesResource;
if (file.exists())
{
rulesResource = file.toURI().toURL();
}
else
{
rulesResource = Resources.getResource(rulesFile);
}
Resources.readLines(rulesResource, Charsets.UTF_8, new LineProcessor<Void>()
{
@Override
public Void getResult()
{
return null;
}
@Override
public boolean processLine(String input) throws IOException
{
String line = Iterables.getFirst(Splitter.on('#').limit(2).split(input), "").trim();
if (line.length()==0)
{
return true;
}
List<String> parts = Lists.newArrayList(Splitter.on(" ").trimResults().split(line));
if (parts.size()>2)
{
throw new RuntimeException("Invalid config file line "+ input);
}
Modifier m = new Modifier();
m.setTargetAccess(parts.get(0));
List<String> descriptor = Lists.newArrayList(Splitter.on(".").trimResults().split(parts.get(1)));
if (descriptor.size() == 1)
{
m.modifyClassVisibility = true;
}
else
{
String nameReference = descriptor.get(1);
int parenIdx = nameReference.indexOf('(');
if (parenIdx>0)
{
m.desc = nameReference.substring(parenIdx);
m.name = nameReference.substring(0,parenIdx);
}
else
{
m.name = nameReference;
}
}
modifiers.put(descriptor.get(0).replace('/', '.'), m);
return true;
}
});
}
@SuppressWarnings("unchecked")
@Override
public byte[] transform(String name, byte[] bytes)
{
if (bytes == null) { return null; }
if (!modifiers.containsKey(name)) { return bytes; }
ClassNode classNode = new ClassNode();
ClassReader classReader = new ClassReader(bytes);
classReader.accept(classNode, 0);
Collection<Modifier> mods = modifiers.get(name);
for (Modifier m : mods)
{
if (m.modifyClassVisibility)
{
classNode.access = getFixedAccess(classNode.access, m);
if (DEBUG)
{
System.out.println(String.format("Class: %s %s -> %s", name, toBinary(m.oldAccess), toBinary(m.newAccess)));
}
continue;
}
if (m.desc.isEmpty())
{
for (FieldNode n : (List<FieldNode>) classNode.fields)
{
if (n.name.equals(m.name) || m.name.equals("*"))
{
n.access = getFixedAccess(n.access, m);
if (DEBUG)
{
System.out.println(String.format("Field: %s.%s %s -> %s", name, n.name, toBinary(m.oldAccess), toBinary(m.newAccess)));
}
if (!m.name.equals("*"))
{
break;
}
}
}
}
else
{
for (MethodNode n : (List<MethodNode>) classNode.methods)
{
if ((n.name.equals(m.name) && n.desc.equals(m.desc)) || m.name.equals("*"))
{
n.access = getFixedAccess(n.access, m);
if (DEBUG)
{
System.out.println(String.format("Method: %s.%s%s %s -> %s", name, n.name, n.desc, toBinary(m.oldAccess), toBinary(m.newAccess)));
}
if (!m.name.equals("*"))
{
break;
}
}
}
}
}
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
classNode.accept(writer);
return writer.toByteArray();
}
private String toBinary(int num)
{
return String.format("%16s", Integer.toBinaryString(num)).replace(' ', '0');
}
private int getFixedAccess(int access, Modifier target)
{
target.oldAccess = access;
int t = target.targetAccess;
int ret = (access & ~7);
switch (access & 7)
{
case ACC_PRIVATE:
ret |= t;
break;
case 0: // default
ret |= (t != ACC_PRIVATE ? t : 0 /* default */);
break;
case ACC_PROTECTED:
ret |= (t != ACC_PRIVATE && t != 0 /* default */? t : ACC_PROTECTED);
break;
case ACC_PUBLIC:
ret |= (t != ACC_PRIVATE && t != 0 /* default */&& t != ACC_PROTECTED ? t : ACC_PUBLIC);
break;
default:
throw new RuntimeException("The fuck?");
}
// Clear the "final" marker on fields only if specified in control field
if (target.changeFinal && target.desc == "")
{
if (target.markFinal)
{
ret |= ACC_FINAL;
}
else
{
ret &= ~ACC_FINAL;
}
}
target.newAccess = ret;
return ret;
}
public static void main(String[] args)
{
if (args.length < 2)
{
System.out.println("Usage: AccessTransformer <JarPath> <MapFile> [MapFile2]... ");
System.exit(1);
}
boolean hasTransformer = false;
AccessTransformer[] trans = new AccessTransformer[args.length - 1];
for (int x = 1; x < args.length; x++)
{
try
{
trans[x - 1] = new AccessTransformer(args[x]);
hasTransformer = true;
}
catch (IOException e)
{
System.out.println("Could not read Transformer Map: " + args[x]);
e.printStackTrace();
}
}
if (!hasTransformer)
{
System.out.println("Culd not find a valid transformer to perform");
System.exit(1);
}
File orig = new File(args[0]);
File temp = new File(args[0] + ".ATBack");
if (!orig.exists() && !temp.exists())
{
System.out.println("Could not find target jar: " + orig);
System.exit(1);
}
if (!orig.renameTo(temp))
{
System.out.println("Could not rename file: " + orig + " -> " + temp);
System.exit(1);
}
try
{
processJar(temp, orig, trans);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
if (!temp.delete())
{
System.out.println("Could not delete temp file: " + temp);
}
}
private static void processJar(File inFile, File outFile, AccessTransformer[] transformers) throws IOException
{
ZipInputStream inJar = null;
ZipOutputStream outJar = null;
try
{
try
{
inJar = new ZipInputStream(new BufferedInputStream(new FileInputStream(inFile)));
}
catch (FileNotFoundException e)
{
throw new FileNotFoundException("Could not open input file: " + e.getMessage());
}
try
{
outJar = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(outFile)));
}
catch (FileNotFoundException e)
{
throw new FileNotFoundException("Could not open output file: " + e.getMessage());
}
ZipEntry entry;
while ((entry = inJar.getNextEntry()) != null)
{
if (entry.isDirectory())
{
outJar.putNextEntry(entry);
continue;
}
byte[] data = new byte[4096];
ByteArrayOutputStream entryBuffer = new ByteArrayOutputStream();
int len;
do
{
len = inJar.read(data);
if (len > 0)
{
entryBuffer.write(data, 0, len);
}
}
while (len != -1);
byte[] entryData = entryBuffer.toByteArray();
String entryName = entry.getName();
if (entryName.endsWith(".class") && !entryName.startsWith("."))
{
ClassNode cls = new ClassNode();
ClassReader rdr = new ClassReader(entryData);
rdr.accept(cls, 0);
String name = cls.name.replace('/', '.').replace('\\', '.');
for (AccessTransformer trans : transformers)
{
entryData = trans.transform(name, entryData);
}
}
ZipEntry newEntry = new ZipEntry(entryName);
outJar.putNextEntry(newEntry);
outJar.write(entryData);
}
}
finally
{
if (outJar != null)
{
try
{
outJar.close();
}
catch (IOException e)
{
}
}
if (inJar != null)
{
try
{
inJar.close();
}
catch (IOException e)
{
}
}
}
}
public void ensurePublicAccessFor(String modClazzName)
{
Modifier m = new Modifier();
m.setTargetAccess("public");
m.modifyClassVisibility = true;
modifiers.put(modClazzName, m);
}
}