added identifier renaming capability

copied some code over from M3L to handle the heavy bytecode magic.
It's ok... M3L will eventually depend on Enigma.
Completely restructured the mappings though. This way is better. =)

1 files changed, 134 insertions, 0 deletions

diff --git a/src/cuchaz/enigma/mapping/Ancestries.java b/src/cuchaz/enigma/mapping/Ancestries.java
new file mode 100644
index 0000000..b7a5e24
--- /dev/null
+++ b/src/cuchaz/enigma/mapping/Ancestries.java
@@ -0,0 +1,134 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.mapping;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+
+import javassist.ByteArrayClassPath;
+import javassist.ClassPool;
+import javassist.CtClass;
+import javassist.NotFoundException;
+import javassist.bytecode.Descriptor;
+
+import com.google.common.collect.Maps;
+
+import cuchaz.enigma.Constants;
+
+public class Ancestries implements Serializable
+{
+        private static final long serialVersionUID = 738687982126844179L;
+        
+        private Map<String,String> m_superclasses;
+        
+        public Ancestries( )
+        {
+                m_superclasses = Maps.newHashMap();
+        }
+        
+        public void readFromJar( InputStream in )
+        throws IOException
+        {
+                ClassPool classPool = new ClassPool();
+                
+                ZipInputStream zin = new ZipInputStream( in );
+                ZipEntry entry;
+                while( ( entry = zin.getNextEntry() ) != null )
+                {
+                        // filter out non-classes
+                        if( entry.isDirectory() || !entry.getName().endsWith( ".class" ) )
+                        {
+                                continue;
+                        }
+                        
+                        // read the class into a buffer
+                        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+                        byte[] buf = new byte[Constants.KiB];
+                        int totalNumBytesRead = 0;
+                        while( zin.available() > 0 )
+                        {
+                                int numBytesRead = zin.read( buf );
+                                if( numBytesRead < 0 )
+                                {
+                                        break;
+                                }
+                                bos.write( buf, 0, numBytesRead );
+                                
+                                // sanity checking
+                                totalNumBytesRead += numBytesRead;
+                                if( totalNumBytesRead > Constants.MiB )
+                                {
+                                        throw new Error( "Class file " + entry.getName() + " larger than 1 MiB! Something is wrong!" );
+                                }
+                        }
+                        
+                        // determine the class name (ie chop off the ".class")
+                        String className = Descriptor.toJavaName( entry.getName().substring( 0, entry.getName().length() - ".class".length() ) );
+                        
+                        // get a javassist handle for the class
+                        classPool.insertClassPath( new ByteArrayClassPath( className, bos.toByteArray() ) );
+                        try
+                        {
+                                CtClass c = classPool.get( className );
+                                addSuperclass( c.getName(), c.getClassFile().getSuperclass() );
+                        }
+                        catch( NotFoundException ex )
+                        {
+                                throw new Error( "Unable to load class: " + className );
+                        }
+                }
+        }
+        
+        public void addSuperclass( String className, String superclassName )
+        {
+                className = Descriptor.toJvmName( className );
+                superclassName = Descriptor.toJvmName( superclassName );
+                
+                if( className.equals( superclassName ) )
+                {
+                        throw new IllegalArgumentException( "Class cannot be its own superclass! " + className );
+                }
+                
+                if( !isJre( className ) && !isJre( superclassName ) )
+                {
+                        m_superclasses.put( className, superclassName );
+                }
+        }
+        
+        public String getSuperclassName( String className )
+        {
+                return m_superclasses.get( className );
+        }
+        
+        public List<String> getAncestry( String className )
+        {
+                List<String> ancestors = new ArrayList<String>();
+                while( className != null )
+                {
+                        className = getSuperclassName( className );
+                        ancestors.add( className );
+                }
+                return ancestors;
+        }
+        
+        private boolean isJre( String className )
+        {
+                return className.startsWith( "java/" )
+                        || className.startsWith( "javax/" );
+        }
+}