1 files changed, 134 insertions, 0 deletions

diff --git a/src/cuchaz/enigma/analysis/JarClassIterator.java b/src/cuchaz/enigma/analysis/JarClassIterator.java
new file mode 100644
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+++ b/src/cuchaz/enigma/analysis/JarClassIterator.java
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+/*******************************************************************************
+ * 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.analysis;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+import javassist.ByteArrayClassPath;
+import javassist.ClassPool;
+import javassist.CtClass;
+import javassist.NotFoundException;
+import javassist.bytecode.Descriptor;
+
+import com.beust.jcommander.internal.Lists;
+
+import cuchaz.enigma.Constants;
+
+public class JarClassIterator implements Iterator<CtClass>
+{
+        private JarFile m_jar;
+        private Iterator<JarEntry> m_iter;
+        
+        public JarClassIterator( JarFile jar )
+        {
+                this( jar, getClassEntries( jar ) );
+        }
+        
+        public JarClassIterator( JarFile jar, List<JarEntry> entries )
+        {
+                m_jar = jar;
+                m_iter = entries.iterator();
+        }
+        
+        @Override
+        public boolean hasNext( )
+        {
+                return m_iter.hasNext();
+        }
+
+        @Override
+        public CtClass next( )
+        {
+                JarEntry entry = m_iter.next();
+                try
+                {
+                        // read the class into a buffer
+                        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+                        byte[] buf = new byte[Constants.KiB];
+                        int totalNumBytesRead = 0;
+                        InputStream in = m_jar.getInputStream( entry );
+                        while( in.available() > 0 )
+                        {
+                                int numBytesRead = in.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 classPool = new ClassPool();
+                        classPool.insertClassPath( new ByteArrayClassPath( className, bos.toByteArray() ) );
+                        return classPool.get( className );
+                }
+                catch( IOException ex )
+                {
+                        throw new Error( "Unable to read class: " + entry.getName() );
+                }
+                catch( NotFoundException ex )
+                {
+                        throw new Error( "Unable to load class: " + entry.getName() );
+                }
+        }
+
+        @Override
+        public void remove( )
+        {
+                throw new UnsupportedOperationException();
+        }
+        
+        public static List<JarEntry> getClassEntries( JarFile jar )
+        {
+                List<JarEntry> classes = Lists.newArrayList();
+                Enumeration<JarEntry> entries = jar.entries();
+                while( entries.hasMoreElements() )
+                {
+                        JarEntry entry = entries.nextElement();
+                        
+                        // is this a class file?
+                        if( !entry.isDirectory() && entry.getName().endsWith( ".class" ) )
+                        {
+                                classes.add( entry );
+                        }
+                }
+                return classes;
+        }
+        
+        public static Iterable<CtClass> classes( final JarFile jar )
+        {
+                return new Iterable<CtClass>( )
+                {
+                        @Override
+                        public Iterator<CtClass> iterator( )
+                        {
+                                return new JarClassIterator( jar );
+                        }
+                };
+        }
+}