java-decompiler: fixes and cleanups

- console decompiler: resource closing, lookup instead of scan, error reporting
- logger interface reworked
- saver interface renamed
- bytecode provider returns byte array (to reduce stream leakage)
- extra level of context unit avoided
- unneeded exceptions, dead code, formatting

27 files changed, 480 insertions, 670 deletions

diff --git a/src/org/jetbrains/java/decompiler/main/ClassWriter.java b/src/org/jetbrains/java/decompiler/main/ClassWriter.java
index 29307e5..63f60ba 100644
--- a/src/org/jetbrains/java/decompiler/main/ClassWriter.java
+++ b/src/org/jetbrains/java/decompiler/main/ClassWriter.java
@@ -630,7 +630,7 @@ public class ClassWriter {
           if (isEnum && init) actualParams -= 2;
           if (actualParams != descriptor.params.size()) {
             String message = "Inconsistent generic signature in method " + mt.getName() + " " + mt.getDescriptor();
-            DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.WARNING);
+            DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
             descriptor = null;
           }
         }
diff --git a/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java b/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
index 74c86d0..6faad08 100644
--- a/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
+++ b/src/org/jetbrains/java/decompiler/main/ClassesProcessor.java
@@ -113,7 +113,7 @@ public class ClassesProcessor {
                   else {
                     if (!InterpreterUtil.equalObjectArrays(arrold, arr)) {
                       DecompilerContext.getLogger()
-                        .writeMessage("Inconsistent inner class entries for " + innername + "!", IFernflowerLogger.WARNING);
+                        .writeMessage("Inconsistent inner class entries for " + innername + "!", IFernflowerLogger.Severity.WARN);
                     }
                   }
 
@@ -178,7 +178,8 @@ public class ClassesProcessor {
 
                 ClassNode nestednode = mapRootClasses.get(nestedClass);
                 if (nestednode == null) {
-                  DecompilerContext.getLogger().writeMessage("Nested class " + nestedClass + " missing!", IFernflowerLogger.WARNING);
+                  DecompilerContext.getLogger().writeMessage("Nested class " + nestedClass + " missing!",
+                                                             IFernflowerLogger.Severity.WARN);
                   continue;
                 }
 
@@ -204,7 +205,7 @@ public class ClassesProcessor {
                   if (interfaces.length > 0) {
                     if (interfaces.length > 1) {
                       DecompilerContext.getLogger()
-                        .writeMessage("Inconsistent anonymous class definition: " + cl.qualifiedName, IFernflowerLogger.WARNING);
+                        .writeMessage("Inconsistent anonymous class definition: " + cl.qualifiedName, IFernflowerLogger.Severity.WARN);
                     }
                     nestednode.anonimousClassType = new VarType(cl.getInterface(0), true);
                   }
diff --git a/src/org/jetbrains/java/decompiler/main/DecompilerContext.java b/src/org/jetbrains/java/decompiler/main/DecompilerContext.java
index 54c426b..b600250 100644
--- a/src/org/jetbrains/java/decompiler/main/DecompilerContext.java
+++ b/src/org/jetbrains/java/decompiler/main/DecompilerContext.java
@@ -132,12 +132,12 @@ public class DecompilerContext {
 
   public static void setLogger(IFernflowerLogger logger) {
     if (logger != null) {
-      String severity = (String)getProperty(IFernflowerPreferences.LOG_LEVEL);
-      if (severity != null) {
-        Integer iSeverity = IFernflowerLogger.mapLogLevel.get(severity.toUpperCase(Locale.US));
-        if (iSeverity != null) {
-          logger.setSeverity(iSeverity);
+      String level = (String)getProperty(IFernflowerPreferences.LOG_LEVEL);
+      if (level != null) {
+        try {
+          logger.setSeverity(IFernflowerLogger.Severity.valueOf(level.toUpperCase(Locale.US)));
         }
+        catch (IllegalArgumentException ignore) { }
       }
     }
     getCurrentContext().logger = logger;
diff --git a/src/org/jetbrains/java/decompiler/main/Fernflower.java b/src/org/jetbrains/java/decompiler/main/Fernflower.java
index 34f9196..62b8ee4 100644
--- a/src/org/jetbrains/java/decompiler/main/Fernflower.java
+++ b/src/org/jetbrains/java/decompiler/main/Fernflower.java
@@ -18,7 +18,8 @@ package org.jetbrains.java.decompiler.main;
 import org.jetbrains.java.decompiler.main.ClassesProcessor.ClassNode;
 import org.jetbrains.java.decompiler.main.collectors.CounterContainer;
 import org.jetbrains.java.decompiler.main.extern.IBytecodeProvider;
-import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
+import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
 import org.jetbrains.java.decompiler.modules.renamer.IdentifierConverter;
 import org.jetbrains.java.decompiler.struct.IDecompiledData;
@@ -28,16 +29,16 @@ import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;
 
 import java.util.Map;
 
-
 public class Fernflower implements IDecompiledData {
 
   private StructContext structContext;
   private ClassesProcessor classesProcessor;
 
-  public Fernflower(IBytecodeProvider provider, IDecompilatSaver saver, Map<String, Object> propertiesCustom) {
+  public Fernflower(IBytecodeProvider provider, IResultSaver saver, Map<String, Object> options, IFernflowerLogger logger) {
     structContext = new StructContext(saver, this, new LazyLoader(provider));
-    DecompilerContext.initContext(propertiesCustom);
+    DecompilerContext.initContext(options);
     DecompilerContext.setCounterContainer(new CounterContainer());
+    DecompilerContext.setLogger(logger);
   }
 
   public void decompileContext() {
@@ -57,6 +58,11 @@ public class Fernflower implements IDecompiledData {
     DecompilerContext.setCurrentContext(null);
   }
 
+  public StructContext getStructContext() {
+    return structContext;
+  }
+
+  @Override
   public String getClassEntryName(StructClass cl, String entryName) {
     ClassNode node = classesProcessor.getMapRootClasses().get(cl.qualifiedName);
     if (node.type != ClassNode.CLASS_ROOT) {
@@ -73,10 +79,7 @@ public class Fernflower implements IDecompiledData {
     }
   }
 
-  public StructContext getStructContext() {
-    return structContext;
-  }
-
+  @Override
   public String getClassContent(StructClass cl) {
     try {
       StringBuilder buffer = new StringBuilder();
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/IdeDecompiler.java b/src/org/jetbrains/java/decompiler/main/decompiler/BaseDecompiler.java
index 212a8bd..07b8578 100644
--- a/src/org/jetbrains/java/decompiler/main/decompiler/IdeDecompiler.java
+++ b/src/org/jetbrains/java/decompiler/main/decompiler/BaseDecompiler.java
@@ -15,28 +15,21 @@
  */
 package org.jetbrains.java.decompiler.main.decompiler;
 
-import org.jetbrains.java.decompiler.main.DecompilerContext;
 import org.jetbrains.java.decompiler.main.Fernflower;
 import org.jetbrains.java.decompiler.main.extern.IBytecodeProvider;
-import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 
 import java.io.File;
 import java.io.IOException;
-import java.util.HashMap;
+import java.util.Map;
 
+public class BaseDecompiler {
 
-public class IdeDecompiler {
+  private final Fernflower fernflower;
 
-  private Fernflower fernflower;
-
-  public IdeDecompiler(IBytecodeProvider provider,
-                       IDecompilatSaver saver, IFernflowerLogger logger,
-                       HashMap<String, Object> propertiesCustom) {
-
-    fernflower = new Fernflower(provider, saver, propertiesCustom);
-
-    DecompilerContext.setLogger(logger);
+  public BaseDecompiler(IBytecodeProvider provider, IResultSaver saver, Map<String, Object> options, IFernflowerLogger logger) {
+    fernflower = new Fernflower(provider, saver, options, logger);
   }
 
   public void addSpace(File file, boolean isOwn) throws IOException {
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java b/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
index d499324..a486d9f 100644
--- a/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
+++ b/src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java
@@ -17,10 +17,9 @@ package org.jetbrains.java.decompiler.main.decompiler;
 
 import org.jetbrains.java.decompiler.main.DecompilerContext;
 import org.jetbrains.java.decompiler.main.Fernflower;
-import org.jetbrains.java.decompiler.main.decompiler.helper.PrintStreamLogger;
 import org.jetbrains.java.decompiler.main.extern.IBytecodeProvider;
-import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 import org.jetbrains.java.decompiler.util.InterpreterUtil;
 
 import java.io.*;
@@ -31,108 +30,97 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 import java.util.zip.ZipOutputStream;
 
-@SuppressWarnings({"UseOfSystemOutOrSystemErr", "CallToPrintStackTrace"})
-public class ConsoleDecompiler implements IBytecodeProvider, IDecompilatSaver {
+public class ConsoleDecompiler implements IBytecodeProvider, IResultSaver {
 
-  private File root;
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  public static void main(String[] args) {
+    if (args.length < 2) {
+      System.out.println(
+        "Usage: java -jar fernflower.jar [-<option>=<value>]* [<source>]+ <destination>\n" +
+        "Example: java -jar fernflower.jar -dgs=true c:\\my\\source\\ c:\\my.jar d:\\decompiled\\");
+      return;
+    }
 
-  private Fernflower fernflower;
+    Map<String, Object> mapOptions = new HashMap<String, Object>();
+    List<String> lstSources = new ArrayList<String>();
+    List<String> lstLibraries = new ArrayList<String>();
 
-  private HashMap<String, ZipOutputStream> mapArchiveStreams = new HashMap<String, ZipOutputStream>();
+    boolean isOption = true;
+    for (int i = 0; i < args.length - 1; ++i) { // last parameter - destination
+      String arg = args[i];
 
-  private HashMap<String, HashSet<String>> mapArchiveEntries = new HashMap<String, HashSet<String>>();
+      if (isOption && arg.startsWith("-") &&
+          arg.length() > 5 && arg.charAt(4) == '=') {
+        String value = arg.substring(5).toUpperCase(Locale.US);
+        if ("TRUE".equals(value)) {
+          value = "1";
+        }
+        else if ("FALSE".equals(value)) {
+          value = "0";
+        }
 
-  public ConsoleDecompiler() {
-    this(null);
-  }
+        mapOptions.put(arg.substring(1, 4), value);
+      }
+      else {
+        isOption = false;
 
-  public ConsoleDecompiler(HashMap<String, Object> propertiesCustom) {
-    this(new PrintStreamLogger(IFernflowerLogger.WARNING, System.out), propertiesCustom);
-  }
+        if (arg.startsWith("-e=")) {
+          lstLibraries.add(arg.substring(3));
+        }
+        else {
+          lstSources.add(arg);
+        }
+      }
+    }
 
-  protected ConsoleDecompiler(IFernflowerLogger logger, HashMap<String, Object> propertiesCustom) {
-    fernflower = new Fernflower(this, this, propertiesCustom);
-    DecompilerContext.setLogger(logger);
-  }
+    if (lstSources.isEmpty()) {
+      System.out.println("error: no sources given");
+      return;
+    }
 
-  public static void main(String[] args) {
+    File destination = new File(args[args.length - 1]);
+    if (!destination.isDirectory()) {
+      System.out.println("error: destination '" + destination + "' is not a directory");
+      return;
+    }
 
-    try {
+    PrintStreamLogger logger = new PrintStreamLogger(System.out);
+    ConsoleDecompiler decompiler = new ConsoleDecompiler(destination, mapOptions, logger);
 
-      if (args != null && args.length > 1) {
-
-        HashMap<String, Object> mapOptions = new HashMap<String, Object>();
-
-        List<String> lstSources = new ArrayList<String>();
-        List<String> lstLibraries = new ArrayList<String>();
-
-        boolean isOption = true;
-        for (int i = 0; i < args.length - 1; ++i) { // last parameter - destination
-          String arg = args[i];
-
-          if (isOption && arg.startsWith("-") &&
-              arg.length() > 5 && arg.charAt(4) == '=') {
-            String value = arg.substring(5).toUpperCase(Locale.US);
-            if ("TRUE".equals(value)) {
-              value = "1";
-            }
-            else if ("FALSE".equals(value)) {
-              value = "0";
-            }
-
-            mapOptions.put(arg.substring(1, 4), value);
-          }
-          else {
-            isOption = false;
-
-            if (arg.startsWith("-e=")) {
-              lstLibraries.add(arg.substring(3));
-            }
-            else {
-              lstSources.add(arg);
-            }
-          }
-        }
+    for (String source : lstSources) {
+      decompiler.addSpace(new File(source), true);
+    }
+    for (String library : lstLibraries) {
+      decompiler.addSpace(new File(library), false);
+    }
 
-        if (lstSources.isEmpty()) {
-          printHelp();
-        }
-        else {
-          ConsoleDecompiler decompiler = new ConsoleDecompiler(
-            new PrintStreamLogger(IFernflowerLogger.INFO, System.out),
-            mapOptions);
+    decompiler.decompileContext();
+  }
 
-          for (String source : lstSources) {
-            decompiler.addSpace(new File(source), true);
-          }
+  // *******************************************************************
+  // Implementation
+  // *******************************************************************
 
-          for (String library : lstLibraries) {
-            decompiler.addSpace(new File(library), false);
-          }
+  private final File root;
+  private final Fernflower fernflower;
+  private Map<String, ZipOutputStream> mapArchiveStreams = new HashMap<String, ZipOutputStream>();
+  private Map<String, Set<String>> mapArchiveEntries = new HashMap<String, Set<String>>();
 
-          decompiler.decompileContext(new File(args[args.length - 1]));
-        }
-      }
-      else {
-        printHelp();
-      }
-    }
-    catch (Exception ex) {
-      ex.printStackTrace();
-    }
+  @SuppressWarnings("UseOfSystemOutOrSystemErr")
+  public ConsoleDecompiler(File destination, Map<String, Object> options) {
+    this(destination, options, new PrintStreamLogger(System.out));
   }
 
-  private static void printHelp() {
-    System.out.println("Usage: java ConsoleDecompiler ( -<option>=<value>)* (<source>)+ <destination>");
-    System.out.println("Example: java ConsoleDecompiler -dgs=true c:\\mysource\\ c:\\my.jar d:\\decompiled\\");
+  protected ConsoleDecompiler(File destination, Map<String, Object> options, IFernflowerLogger logger) {
+    root = destination;
+    fernflower = new Fernflower(this, this, options, logger);
   }
 
-  public void addSpace(File file, boolean isOwn) throws IOException {
+  public void addSpace(File file, boolean isOwn) {
     fernflower.getStructContext().addSpace(file, isOwn);
   }
 
-  public void decompileContext(File root) {
-    this.root = root;
+  public void decompileContext() {
     try {
       fernflower.decompileContext();
     }
@@ -145,183 +133,167 @@ public class ConsoleDecompiler implements IBytecodeProvider, IDecompilatSaver {
   // Interface IBytecodeProvider
   // *******************************************************************
 
-  public InputStream getBytecodeStream(String externPath, String internPath) {
-
-    try {
-      File file = new File(externPath);
-
-      if (internPath == null) {
-        return new FileInputStream(file);
-      }
-      else { // archive file
-        ZipFile archive = new ZipFile(file);
-
-        Enumeration<? extends ZipEntry> en = archive.entries();
-        while (en.hasMoreElements()) {
-          ZipEntry entr = en.nextElement();
-
-          if (entr.getName().equals(internPath)) {
-            return archive.getInputStream(entr);
-          }
+  @Override
+  public byte[] getBytecode(String externalPath, String internalPath) throws IOException {
+    File file = new File(externalPath);
+    if (internalPath == null) {
+      return InterpreterUtil.getBytes(file);
+    }
+    else {
+      ZipFile archive = new ZipFile(file);
+      try {
+        ZipEntry entry = archive.getEntry(internalPath);
+        if (entry == null) {
+          throw new IOException("Entry not found: " + internalPath);
         }
+        return InterpreterUtil.getBytes(archive, entry);
+      }
+      finally {
+        archive.close();
       }
     }
-    catch (IOException ex) {
-      ex.printStackTrace();
-    }
-
-    return null;
   }
 
   // *******************************************************************
-  // Interface IDecompilatSaver
+  // Interface IResultSaver
   // *******************************************************************
 
   private String getAbsolutePath(String path) {
     return new File(root, path).getAbsolutePath();
   }
 
-  private boolean addEntryName(String filename, String entry) {
-    HashSet<String> set = mapArchiveEntries.get(filename);
-    if (set == null) {
-      mapArchiveEntries.put(filename, set = new HashSet<String>());
+  @Override
+  public void saveFolder(String path) {
+    File dir = new File(getAbsolutePath(path));
+    if (!(dir.mkdirs() || dir.isDirectory())) {
+      throw new RuntimeException("Cannot create directory " + dir);
     }
-
-    return set.add(entry);
   }
 
-  public void copyEntry(String source, String destpath, String archivename, String entryName) {
-
+  @Override
+  public void copyFile(String source, String path, String entryName) {
     try {
-      String filename = new File(getAbsolutePath(destpath), archivename).getAbsolutePath();
-
-      if (!addEntryName(filename, entryName)) {
-        DecompilerContext.getLogger().writeMessage("Zip entry already exists: " +
-                                                   destpath + "," + archivename + "," + entryName, IFernflowerLogger.WARNING);
-        return;
-      }
-
-      ZipFile srcarchive = new ZipFile(new File(source));
-
-      Enumeration<? extends ZipEntry> en = srcarchive.entries();
-      while (en.hasMoreElements()) {
-        ZipEntry entr = en.nextElement();
-
-        if (entr.getName().equals(entryName)) {
-          InputStream in = srcarchive.getInputStream(entr);
-
-          ZipOutputStream out = mapArchiveStreams.get(filename);
-          out.putNextEntry(new ZipEntry(entryName));
-
-          InterpreterUtil.copyStream(in, out);
-          in.close();
-        }
-      }
-
-      srcarchive.close();
+      InterpreterUtil.copyFile(new File(source), new File(getAbsolutePath(path), entryName));
     }
     catch (IOException ex) {
-      DecompilerContext.getLogger()
-        .writeMessage("Error copying zip file entry: " + source + "," + destpath + "," + archivename + "," + entryName,
-                      IFernflowerLogger.WARNING);
-      ex.printStackTrace();
+      DecompilerContext.getLogger().writeMessage("Cannot copy " + source + " to " + entryName, ex);
     }
   }
 
-  public void copyFile(String source, String destpath, String destfilename) {
+  @Override
+  public void saveClassFile(String path, String qualifiedName, String entryName, String content) {
+    File file = new File(getAbsolutePath(path), entryName);
     try {
-      InterpreterUtil.copyFile(new File(source), new File(destfilename));
+      Writer out = new OutputStreamWriter(new FileOutputStream(file), "UTF8");
+      try {
+        out.write(content);
+      }
+      finally {
+        out.close();
+      }
     }
     catch (IOException ex) {
-      ex.printStackTrace();
+      DecompilerContext.getLogger().writeMessage("Cannot write class file " + file, ex);
     }
   }
 
-  public void saveFile(String path, String filename, String content) {
+  @Override
+  public void createArchive(String path, String archiveName, Manifest manifest) {
+    File file = new File(getAbsolutePath(path), archiveName);
     try {
-      BufferedWriter out =
-        new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(getAbsolutePath(path), filename)), "UTF8"));
-      out.write(content);
-      out.flush();
-      out.close();
+      if (!(file.createNewFile() || file.isFile())) {
+        throw new IOException("Cannot create file " + file);
+      }
+
+      FileOutputStream fileStream = new FileOutputStream(file);
+      @SuppressWarnings("IOResourceOpenedButNotSafelyClosed")
+      ZipOutputStream zipStream = manifest != null ? new JarOutputStream(fileStream, manifest) : new ZipOutputStream(fileStream);
+      mapArchiveStreams.put(file.getPath(), zipStream);
     }
     catch (IOException ex) {
-      ex.printStackTrace();
+      DecompilerContext.getLogger().writeMessage("Cannot create archive " + file, ex);
     }
   }
 
-  public void createArchive(String path, String archivename, Manifest manifest) {
+  @Override
+  public void saveDirEntry(String path, String archiveName, String entryName) {
+    saveClassEntry(path, archiveName, null, entryName, null);
+  }
 
-    try {
-      File file = new File(getAbsolutePath(path), archivename);
-      file.createNewFile();
+  @Override
+  public void copyEntry(String source, String path, String archiveName, String entryName) {
+    String file = new File(getAbsolutePath(path), archiveName).getPath();
+
+    if (!checkEntry(entryName, file)) {
+      return;
+    }
 
-      ZipOutputStream out;
-      if (manifest != null) { // jar
-        out = new JarOutputStream(new FileOutputStream(file), manifest);
+    try {
+      ZipFile srcArchive = new ZipFile(new File(source));
+      try {
+        ZipEntry entry = srcArchive.getEntry(entryName);
+        if (entry != null) {
+          InputStream in = srcArchive.getInputStream(entry);
+          ZipOutputStream out = mapArchiveStreams.get(file);
+          out.putNextEntry(new ZipEntry(entryName));
+          InterpreterUtil.copyStream(in, out);
+          in.close();
+        }
       }
-      else {
-        out = new ZipOutputStream(new FileOutputStream(file));
+      finally {
+        srcArchive.close();
       }
-      mapArchiveStreams.put(file.getAbsolutePath(), out);
     }
     catch (IOException ex) {
-      ex.printStackTrace();
+      String message = "Cannot copy entry " + entryName + " from " + source + " to " + file;
+      DecompilerContext.getLogger().writeMessage(message, ex);
     }
   }
 
-  public void saveClassEntry(String path, String archivename,
-                             String qualifiedName, String entryName, String content) {
-    saveEntry(path, archivename, entryName, content);
-  }
+  @Override
+  public void saveClassEntry(String path, String archiveName, String qualifiedName, String entryName, String content) {
+    String file = new File(getAbsolutePath(path), archiveName).getPath();
 
-  public void saveClassFile(String path, String qualifiedName, String entryName, String content) {
-    saveFile(path, entryName, content);
-  }
-
-  public void saveEntry(String path, String archivename, String entryName,
-                        String content) {
+    if (!checkEntry(entryName, file)) {
+      return;
+    }
 
     try {
-      String filename = new File(getAbsolutePath(path), archivename).getAbsolutePath();
-
-      if (!addEntryName(filename, entryName)) {
-        DecompilerContext.getLogger().writeMessage("Zip entry already exists: " +
-                                                   path + "," + archivename + "," + entryName, IFernflowerLogger.WARNING);
-        return;
-      }
-
-      ZipOutputStream out = mapArchiveStreams.get(filename);
+      ZipOutputStream out = mapArchiveStreams.get(file);
       out.putNextEntry(new ZipEntry(entryName));
-
       if (content != null) {
-        BufferedWriter outwriter = new BufferedWriter(new OutputStreamWriter(out, "UTF8"));
-        outwriter.write(content);
-        outwriter.flush();
+        out.write(content.getBytes("UTF-8"));
       }
     }
     catch (IOException ex) {
-      ex.printStackTrace();
+      String message = "Cannot write entry " + entryName + " to " + file;
+      DecompilerContext.getLogger().writeMessage(message, ex);
     }
   }
 
-  public void saveFolder(String path) {
-    File f = new File(getAbsolutePath(path));
-    f.mkdirs();
-  }
+  private boolean checkEntry(String entryName, String file) {
+    Set<String> set = mapArchiveEntries.get(file);
+    if (set == null) {
+      mapArchiveEntries.put(file, set = new HashSet<String>());
+    }
 
+    boolean added = set.add(entryName);
+    if (!added) {
+      String message = "Zip entry " + entryName + " already exists in " + file;
+      DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.WARN);
+    }
+    return added;
+  }
 
-  public void closeArchive(String path, String archivename) {
+  @Override
+  public void closeArchive(String path, String archiveName) {
+    String file = new File(getAbsolutePath(path), archiveName).getPath();
     try {
-      String filename = new File(getAbsolutePath(path), archivename).getAbsolutePath();
-
-      mapArchiveEntries.remove(filename);
-      OutputStream out = mapArchiveStreams.remove(filename);
-      out.flush();
-      out.close();
+      mapArchiveEntries.remove(file);
+      mapArchiveStreams.remove(file).close();
     }
     catch (IOException ex) {
-      ex.printStackTrace();
+      DecompilerContext.getLogger().writeMessage("Cannot close " + file, IFernflowerLogger.Severity.WARN);
     }
   }
 }
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/PrintStreamLogger.java b/src/org/jetbrains/java/decompiler/main/decompiler/PrintStreamLogger.java
new file mode 100644
index 0000000..7bbcc19
--- /dev/null
+++ b/src/org/jetbrains/java/decompiler/main/decompiler/PrintStreamLogger.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.java.decompiler.main.decompiler;
+
+import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
+import org.jetbrains.java.decompiler.util.InterpreterUtil;
+
+import java.io.PrintStream;
+
+public class PrintStreamLogger extends IFernflowerLogger {
+
+  private final PrintStream stream;
+  private int indent;
+
+  public PrintStreamLogger(PrintStream printStream) {
+    stream = printStream;
+    indent = 0;
+  }
+
+  @Override
+  public void writeMessage(String message, Severity severity) {
+    if (accepts(severity)) {
+      stream.println(InterpreterUtil.getIndentString(indent) + severity.name() + ": " + message);
+    }
+  }
+
+  @Override
+  public void writeMessage(String message, Throwable t) {
+    writeMessage(message, Severity.ERROR);
+    if (accepts(Severity.ERROR)) {
+      t.printStackTrace(stream);
+    }
+  }
+
+  @Override
+  public void startClass(String className) {
+    writeMessage("Processing class " + className + " ...", Severity.INFO);
+    ++indent;
+  }
+
+  @Override
+  public void endClass() {
+    --indent;
+    writeMessage("... proceeded.", Severity.INFO);
+  }
+
+  @Override
+  public void startWriteClass(String className) {
+    writeMessage("Writing class " + className + " ...", Severity.INFO);
+    ++indent;
+  }
+
+  @Override
+  public void endWriteClass() {
+    --indent;
+    writeMessage("... written.", Severity.INFO);
+  }
+
+  @Override
+  public void startMethod(String methodName) {
+    writeMessage("Processing method " + methodName + " ...", Severity.INFO);
+  }
+
+  public void endMethod() {
+    writeMessage("... proceeded.", Severity.INFO);
+  }
+}
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/WebDecompiler.java b/src/org/jetbrains/java/decompiler/main/decompiler/WebDecompiler.java
deleted file mode 100644
index 06e4c6f..0000000
--- a/src/org/jetbrains/java/decompiler/main/decompiler/WebDecompiler.java
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * Copyright 2000-2014 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.jetbrains.java.decompiler.main.decompiler;
-
-import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
-
-import java.io.File;
-import java.util.HashMap;
-import java.util.HashSet;
-
-
-public class WebDecompiler extends ConsoleDecompiler {
-
-  private HashMap<String, File> mapInputFilenames = new HashMap<String, File>();
-
-  private HashSet<String> setClassFiles = new HashSet<String>();
-
-  private File root;
-
-  public WebDecompiler(IFernflowerLogger logger, HashMap<String, Object> propertiesCustom) {
-    super(logger, propertiesCustom);
-  }
-
-  @Override
-  public void decompileContext(File root) {
-    this.root = root;
-    super.decompileContext(root);
-  }
-
-  @Override
-  public void copyFile(String source, String destpath, String destfilename) {
-    super.copyFile(source, destpath, destfilename);
-    mapInputFilenames.put(destfilename, new File(getAbsolutePath(destpath), destfilename));
-  }
-
-  @Override
-  public void saveFile(String path, String filename, String content) {
-    super.saveFile(path, filename, content);
-
-    mapInputFilenames.put(setClassFiles.contains(filename) ?
-                          filename.substring(0, filename.lastIndexOf(".java")) + ".class" :
-                          filename, new File(getAbsolutePath(path), filename));
-  }
-
-  @Override
-  public void saveClassFile(String path, String qualifiedName, String entryName, String content) {
-    setClassFiles.add(entryName);
-    saveFile(path, entryName, content);
-  }
-
-  @Override
-  public void closeArchive(String path, String archivename) {
-    super.closeArchive(path, archivename);
-    mapInputFilenames.put(archivename, new File(getAbsolutePath(path), archivename));
-  }
-
-  private String getAbsolutePath(String path) {
-    return new File(root, path).getAbsolutePath();
-  }
-
-  public HashMap<String, File> getMapInputFilenames() {
-    return mapInputFilenames;
-  }
-}
-
diff --git a/src/org/jetbrains/java/decompiler/main/decompiler/helper/PrintStreamLogger.java b/src/org/jetbrains/java/decompiler/main/decompiler/helper/PrintStreamLogger.java
deleted file mode 100644
index 3a6c7e8..0000000
--- a/src/org/jetbrains/java/decompiler/main/decompiler/helper/PrintStreamLogger.java
+++ /dev/null
@@ -1,84 +0,0 @@
-/*
- * Copyright 2000-2014 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.jetbrains.java.decompiler.main.decompiler.helper;
-
-import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
-import org.jetbrains.java.decompiler.util.InterpreterUtil;
-
-import java.io.PrintStream;
-
-public class PrintStreamLogger implements IFernflowerLogger {
-
-  private int severity;
-
-  private int indent;
-
-  private PrintStream stream;
-
-  public PrintStreamLogger(int severity, PrintStream stream) {
-    this.severity = severity;
-    this.indent = 0;
-    this.stream = stream;
-  }
-
-
-  public void writeMessage(String message, int severity) {
-    if (severity >= this.severity) {
-      stream.println(InterpreterUtil.getIndentString(indent) + names[severity] + ": " + message);
-    }
-  }
-
-  public void writeMessage(String message, Throwable t) {
-    t.printStackTrace(stream);
-    writeMessage(message, ERROR);
-  }
-
-  public void startClass(String classname) {
-    stream.println(InterpreterUtil.getIndentString(indent++) + "Processing class " + classname + " ...");
-  }
-
-  public void endClass() {
-    stream.println(InterpreterUtil.getIndentString(--indent) + "... proceeded.");
-  }
-
-  public void startWriteClass(String classname) {
-    stream.println(InterpreterUtil.getIndentString(indent++) + "Writing class " + classname + " ...");
-  }
-
-  public void endWriteClass() {
-    stream.println(InterpreterUtil.getIndentString(--indent) + "... written.");
-  }
-
-  public void startMethod(String method) {
-    if (severity <= INFO) {
-      stream.println(InterpreterUtil.getIndentString(indent) + "Processing method " + method + " ...");
-    }
-  }
-
-  public void endMethod() {
-    if (severity <= INFO) {
-      stream.println(InterpreterUtil.getIndentString(indent) + "... proceeded.");
-    }
-  }
-
-  public int getSeverity() {
-    return severity;
-  }
-
-  public void setSeverity(int severity) {
-    this.severity = severity;
-  }
-}
diff --git a/src/org/jetbrains/java/decompiler/main/extern/IBytecodeProvider.java b/src/org/jetbrains/java/decompiler/main/extern/IBytecodeProvider.java
index 8fe0b31..adf3270 100644
--- a/src/org/jetbrains/java/decompiler/main/extern/IBytecodeProvider.java
+++ b/src/org/jetbrains/java/decompiler/main/extern/IBytecodeProvider.java
@@ -15,9 +15,8 @@
  */
 package org.jetbrains.java.decompiler.main.extern;
 
-import java.io.InputStream;
+import java.io.IOException;
 
 public interface IBytecodeProvider {
-
-  InputStream getBytecodeStream(String externPath, String internPath);
+  byte[] getBytecode(String externalPath, String internalPath) throws IOException;
 }
diff --git a/src/org/jetbrains/java/decompiler/main/extern/IFernflowerLogger.java b/src/org/jetbrains/java/decompiler/main/extern/IFernflowerLogger.java
index d9c8f74..65b2c6d 100644
--- a/src/org/jetbrains/java/decompiler/main/extern/IFernflowerLogger.java
+++ b/src/org/jetbrains/java/decompiler/main/extern/IFernflowerLogger.java
@@ -15,43 +15,35 @@
  */
 package org.jetbrains.java.decompiler.main.extern;
 
-import java.util.HashMap;
+public abstract class IFernflowerLogger {
 
-public interface IFernflowerLogger {
+  public enum Severity {
+    TRACE, INFO, WARN, ERROR
+  }
 
-  int TRACE = 1;
-  int INFO = 2;
-  int WARNING = 3;
-  int ERROR = 4;
-  int IMMEDIATE = 5;
+  private Severity severity = Severity.INFO;
 
-  HashMap<String, Integer> mapLogLevel = new HashMap<String, Integer>() {{
-    put("TRACE", 1);
-    put("INFO", 2);
-    put("WARN", 3);
-    put("ERROR", 4);
-    put("IMME", 5);
-  }};
+  public boolean accepts(Severity severity) {
+    return severity.ordinal() >= this.severity.ordinal();
+  }
 
-  String[] names = new String[]{""/*DUMMY ENTRY*/, "TRACE", "INFO", "WARNING", "ERROR", ""/*IMMEDIATE*/};
+  public void setSeverity(Severity severity) {
+    this.severity = severity;
+  }
 
-  void writeMessage(String message, int severity);
+  public abstract void writeMessage(String message, Severity severity);
 
-  void writeMessage(String message, Throwable t);
+  public abstract void writeMessage(String message, Throwable t);
 
-  void startClass(String classname);
+  public void startClass(String className) { }
 
-  void endClass();
+  public void endClass() { }
 
-  void startWriteClass(String classname);
+  public void startWriteClass(String className) { }
 
-  void endWriteClass();
+  public void endWriteClass() { }
 
-  void startMethod(String method);
+  public void startMethod(String methodName) { }
 
-  void endMethod();
-
-  int getSeverity();
-
-  void setSeverity(int severity);
+  public void endMethod() { }
 }
diff --git a/src/org/jetbrains/java/decompiler/main/extern/IFernflowerPreferences.java b/src/org/jetbrains/java/decompiler/main/extern/IFernflowerPreferences.java
index c942bad..69dd218 100644
--- a/src/org/jetbrains/java/decompiler/main/extern/IFernflowerPreferences.java
+++ b/src/org/jetbrains/java/decompiler/main/extern/IFernflowerPreferences.java
@@ -77,6 +77,7 @@ public interface IFernflowerPreferences {
     put(IDEA_NOT_NULL_ANNOTATION, "1");
     put(LAMBDA_TO_ANONYMOUS_CLASS, "0");
 
+    put(LOG_LEVEL, IFernflowerLogger.Severity.INFO.name());
     put(MAX_PROCESSING_METHOD, "0");
     put(RENAME_ENTITIES, "0");
     put(NEW_LINE_SEPARATOR, (InterpreterUtil.IS_WINDOWS ? "0" : "1"));
diff --git a/src/org/jetbrains/java/decompiler/main/extern/IDecompilatSaver.java b/src/org/jetbrains/java/decompiler/main/extern/IResultSaver.java
index 9cbac0c..1e6a7d4 100644
--- a/src/org/jetbrains/java/decompiler/main/extern/IDecompilatSaver.java
+++ b/src/org/jetbrains/java/decompiler/main/extern/IResultSaver.java
@@ -17,23 +17,20 @@ package org.jetbrains.java.decompiler.main.extern;
 
 import java.util.jar.Manifest;
 
-public interface IDecompilatSaver {
-
-  void copyFile(String source, String destpath, String destfilename);
-
+public interface IResultSaver {
   void saveFolder(String path);
 
-  void saveClassFile(String path, String qualifiedName, String entryName, String content);
+  void copyFile(String source, String path, String entryName);
 
-  void saveFile(String path, String filename, String content);
+  void saveClassFile(String path, String qualifiedName, String entryName, String content);
 
-  void createArchive(String path, String archivename, Manifest manifest);
+  void createArchive(String path, String archiveName, Manifest manifest);
 
-  void saveClassEntry(String path, String archivename, String qualifiedName, String entryName, String content);
+  void saveDirEntry(String path, String archiveName, String entryName);
 
-  void saveEntry(String path, String archivename, String entryName, String content);
+  void copyEntry(String source, String path, String archiveName, String entry);
 
-  void copyEntry(String source, String destpath, String archivename, String entry);
+  void saveClassEntry(String path, String archiveName, String qualifiedName, String entryName, String content);
 
-  void closeArchive(String path, String archivename);
+  void closeArchive(String path, String archiveName);
 }
diff --git a/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java b/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
index ae251b9..4a32179 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/ClassWrapper.java
@@ -106,7 +106,7 @@ public class ClassWrapper {
 
               if (System.currentTimeMillis() >= stopAt) {
                 String message = "Processing time limit exceeded for method " + mt.getName() + ", execution interrupted.";
-                DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.ERROR);
+                DecompilerContext.getLogger().writeMessage(message, IFernflowerLogger.Severity.ERROR);
                 killThread(mtthread);
                 isError = true;
                 break;
diff --git a/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java b/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
index 426f143..2f98cf8 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/MethodProcessorThread.java
@@ -130,7 +130,7 @@ public class MethodProcessorThread implements Runnable {
     //System.out.println(graph.toString());
 
     if (ExceptionDeobfuscator.hasObfuscatedExceptions(graph)) {
-      DecompilerContext.getLogger().writeMessage("Heavily obfuscated exception ranges found!", IFernflowerLogger.WARNING);
+      DecompilerContext.getLogger().writeMessage("Heavily obfuscated exception ranges found!", IFernflowerLogger.Severity.WARN);
     }
 
     RootStatement root = DomHelper.parseGraph(graph);
diff --git a/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java b/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
index 684864d..2e83946 100644
--- a/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
+++ b/src/org/jetbrains/java/decompiler/main/rels/NestedClassProcessor.java
@@ -75,7 +75,8 @@ public class NestedClassProcessor {
           child.simpleName = "SyntheticClass_" + (++synthetics);
         }
         else {
-          DecompilerContext.getLogger().writeMessage("Nameless local or member class " + cl.qualifiedName + "!", IFernflowerLogger.WARNING);
+          DecompilerContext.getLogger().writeMessage("Nameless local or member class " + cl.qualifiedName + "!",
+                                                     IFernflowerLogger.Severity.WARN);
           child.simpleName = "NamelessClass_" + (++nameless);
         }
       }
@@ -221,11 +222,11 @@ public class NestedClassProcessor {
         if (!hasEnclosing) {
           if (child.type == ClassNode.CLASS_ANONYMOUS) {
             DecompilerContext.getLogger()
-              .writeMessage("Unreferenced anonymous class " + child.classStruct.qualifiedName + "!", IFernflowerLogger.WARNING);
+              .writeMessage("Unreferenced anonymous class " + child.classStruct.qualifiedName + "!", IFernflowerLogger.Severity.WARN);
           }
           else if (child.type == ClassNode.CLASS_LOCAL) {
             DecompilerContext.getLogger()
-              .writeMessage("Unreferenced local class " + child.classStruct.qualifiedName + "!", IFernflowerLogger.WARNING);
+              .writeMessage("Unreferenced local class " + child.classStruct.qualifiedName + "!", IFernflowerLogger.Severity.WARN);
           }
         }
       }
@@ -275,7 +276,7 @@ public class NestedClassProcessor {
           HashMap<String, List<VarFieldPair>> mask = getMaskLocalVars(nd.wrapper);
           if (mask.isEmpty()) {
             DecompilerContext.getLogger()
-              .writeMessage("Nested class " + nd.classStruct.qualifiedName + " has no constructor!", IFernflowerLogger.WARNING);
+              .writeMessage("Nested class " + nd.classStruct.qualifiedName + " has no constructor!", IFernflowerLogger.Severity.WARN);
           }
           else {
             mapVarMasks.put(nd.classStruct.qualifiedName, mask);
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java b/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
index 422b93b..3bb4584 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/DomHelper.java
@@ -213,7 +213,7 @@ public class DomHelper {
     RootStatement root = graphToStatement(graph);
 
     if (!processStatement(root, new HashMap<Integer, Set<Integer>>())) {
-      DecompilerContext.getLogger().writeMessage("parsing failure!", IFernflowerLogger.ERROR);
+      DecompilerContext.getLogger().writeMessage("parsing failure!", IFernflowerLogger.Severity.ERROR);
 
       //			try {
       //				DotExporter.toDotFile(root.getFirst().getStats().get(13), new File("c:\\Temp\\stat1.dot"));
@@ -348,13 +348,14 @@ public class DomHelper {
           // take care of irreducible control flow graphs
           if (IrreducibleCFGDeobfuscator.isStatementIrreducible(general)) {
             if (!IrreducibleCFGDeobfuscator.splitIrreducibleNode(general)) {
-              DecompilerContext.getLogger().writeMessage("Irreducible statement cannot be decomposed!", IFernflowerLogger.ERROR);
+              DecompilerContext.getLogger().writeMessage("Irreducible statement cannot be decomposed!", IFernflowerLogger.Severity.ERROR);
               break;
             }
           }
           else {
             if (mapstage == 2 || mapRefreshed) { // last chance lost
-              DecompilerContext.getLogger().writeMessage("Statement cannot be decomposed although reducible!", IFernflowerLogger.ERROR);
+              DecompilerContext.getLogger().writeMessage("Statement cannot be decomposed although reducible!",
+                                                         IFernflowerLogger.Severity.ERROR);
             }
             break;
           }
diff --git a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
index 024b806..cbdb3b7 100644
--- a/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
+++ b/src/org/jetbrains/java/decompiler/modules/decompiler/stats/Statement.java
@@ -463,7 +463,7 @@ public class Statement {
     }
 
     if (res.size() != stats.size()) {
-      DecompilerContext.getLogger().writeMessage("computing post reverse post order failed!", IFernflowerLogger.ERROR);
+      DecompilerContext.getLogger().writeMessage("computing post reverse post order failed!", IFernflowerLogger.Severity.ERROR);
 
       throw new RuntimeException("parsing failure!");
     }
diff --git a/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java b/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
index adff502..9ed3578 100644
--- a/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
+++ b/src/org/jetbrains/java/decompiler/modules/renamer/IdentifierConverter.java
@@ -387,8 +387,8 @@ public class IdentifierConverter {
 
   private void buildInheritanceTree() {
 
-    HashMap<String, ClassWrapperNode> nodes = new HashMap<String, ClassWrapperNode>();
-    HashMap<String, StructClass> classes = context.getClasses();
+    Map<String, ClassWrapperNode> nodes = new HashMap<String, ClassWrapperNode>();
+    Map<String, StructClass> classes = context.getClasses();
 
     List<ClassWrapperNode> rootClasses = new ArrayList<ClassWrapperNode>();
     List<ClassWrapperNode> rootInterfaces = new ArrayList<ClassWrapperNode>();
diff --git a/src/org/jetbrains/java/decompiler/struct/ContextUnit.java b/src/org/jetbrains/java/decompiler/struct/ContextUnit.java
index 44ec746..819ae64 100644
--- a/src/org/jetbrains/java/decompiler/struct/ContextUnit.java
+++ b/src/org/jetbrains/java/decompiler/struct/ContextUnit.java
@@ -15,7 +15,7 @@
  */
 package org.jetbrains.java.decompiler.struct;
 
-import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;
 import org.jetbrains.java.decompiler.struct.lazy.LazyLoader.Link;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
@@ -23,6 +23,7 @@ import org.jetbrains.java.decompiler.util.DataInputFullStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.jar.JarFile;
 import java.util.jar.Manifest;
 
 public class ContextUnit {
@@ -31,168 +32,125 @@ public class ContextUnit {
   public static final int TYPE_JAR = 1;
   public static final int TYPE_ZIP = 2;
 
-  private static final String MANIFEST_ENTRY = "META-INF/MANIFEST.MF";
+  private final int type;
+  private final boolean own;
 
-  // *****************************************************************************
-  // private fields
-  // *****************************************************************************
+  private final String archivePath;  // relative path to jar/zip
+  private final String filename;     // folder: relative path, archive: file name
+  private final IResultSaver resultSaver;
+  private final IDecompiledData decompiledData;
 
-  private int type;
-
-  // relative path to jar/zip
-  private String archivepath;
-
-  // folder: relative path
-  // archive: file name
-  private String filename;
+  private final List<String> classEntries = new ArrayList<String>();  // class file or jar/zip entry
+  private final List<String> dirEntries = new ArrayList<String>();
+  private final List<String[]> otherEntries = new ArrayList<String[]>();
 
   private List<StructClass> classes = new ArrayList<StructClass>();
-
-  // class file or jar/zip entry. Should, but doesn't have to be the same as qualifiedName of the class
-  private List<String> classentries = new ArrayList<String>();
-
-  private List<String> direntries = new ArrayList<String>();
-
-  private List<String[]> otherentries = new ArrayList<String[]>();
-
   private Manifest manifest;
 
-  private IDecompilatSaver decompilatSaver;
-
-  private IDecompiledData decompiledData;
-
-  private boolean own = true;
-
-  // *****************************************************************************
-  // constructors
-  // *****************************************************************************
-
-  public ContextUnit(int type, String archivepath, String filename, boolean own,
-                     IDecompilatSaver decompilatSaver, IDecompiledData decompiledData) {
+  public ContextUnit(int type, String archivePath, String filename, boolean own, IResultSaver resultSaver, IDecompiledData decompiledData) {
     this.type = type;
     this.own = own;
-    this.archivepath = archivepath;
+    this.archivePath = archivePath;
     this.filename = filename;
-    this.decompilatSaver = decompilatSaver;
+    this.resultSaver = resultSaver;
     this.decompiledData = decompiledData;
   }
 
-  // *****************************************************************************
-  // public methods
-  // *****************************************************************************
-
-  public void addClass(StructClass cl, String entryname) {
+  public void addClass(StructClass cl, String entryName) {
     classes.add(cl);
-    classentries.add(entryname);
+    classEntries.add(entryName);
   }
 
   public void addDirEntry(String entry) {
-    direntries.add(entry);
+    dirEntries.add(entry);
   }
 
-  public void addOtherEntry(String fullpath, String entry) {
-    otherentries.add(new String[]{fullpath, entry});
+  public void addOtherEntry(String fullPath, String entry) {
+    otherEntries.add(new String[]{fullPath, entry});
   }
 
   public void reload(LazyLoader loader) throws IOException {
-
     List<StructClass> lstClasses = new ArrayList<StructClass>();
+
     for (StructClass cl : classes) {
-      String oldname = cl.qualifiedName;
+      String oldName = cl.qualifiedName;
 
-      StructClass newcl;
-      DataInputFullStream in = loader.getClassStream(oldname);
+      StructClass newCl;
+      DataInputFullStream in = loader.getClassStream(oldName);
       try {
-        newcl = new StructClass(in, cl.isOwn(), loader);
+        newCl = new StructClass(in, cl.isOwn(), loader);
       }
       finally {
         in.close();
       }
 
-      lstClasses.add(newcl);
+      lstClasses.add(newCl);
 
-      Link lnk = loader.getClassLink(oldname);
-      loader.removeClassLink(oldname);
-      loader.addClassLink(newcl.qualifiedName, lnk);
+      Link lnk = loader.getClassLink(oldName);
+      loader.removeClassLink(oldName);
+      loader.addClassLink(newCl.qualifiedName, lnk);
     }
 
     classes = lstClasses;
   }
 
   public void save() {
-
     switch (type) {
       case TYPE_FOLDER:
-
         // create folder
-        decompilatSaver.saveFolder(filename);
+        resultSaver.saveFolder(filename);
 
         // non-class files
-        for (String[] arr : otherentries) {
-          decompilatSaver.copyFile(arr[0], filename, arr[0]);
+        for (String[] pair : otherEntries) {
+          resultSaver.copyFile(pair[0], filename, pair[1]);
         }
 
         // classes
         for (int i = 0; i < classes.size(); i++) {
-
           StructClass cl = classes.get(i);
-          String entryname = classentries.get(i);
-
-          entryname = decompiledData.getClassEntryName(cl, entryname);
-          if (entryname != null) {
+          String entryName = decompiledData.getClassEntryName(cl, classEntries.get(i));
+          if (entryName != null) {
             String content = decompiledData.getClassContent(cl);
             if (content != null) {
-              decompilatSaver.saveClassFile(filename, cl.qualifiedName, entryname, content);
+              resultSaver.saveClassFile(filename, cl.qualifiedName, entryName, content);
             }
           }
         }
 
         break;
+
       case TYPE_JAR:
       case TYPE_ZIP:
-
         // create archive file
-        decompilatSaver.saveFolder(archivepath);
-        decompilatSaver.createArchive(archivepath, filename, manifest);
+        resultSaver.saveFolder(archivePath);
+        resultSaver.createArchive(archivePath, filename, manifest);
 
         // directory entries
-        for (String direntry : direntries) {
-          decompilatSaver.saveEntry(archivepath, filename, direntry, null);
+        for (String dirEntry : dirEntries) {
+          resultSaver.saveDirEntry(archivePath, filename, dirEntry);
         }
 
         // non-class entries
-        for (String[] arr : otherentries) {
-          // manifest was defined by constructor invocation
-          if (type != TYPE_JAR || !MANIFEST_ENTRY.equalsIgnoreCase(arr[1])) {
-            decompilatSaver.copyEntry(arr[0], archivepath, filename, arr[1]);
+        for (String[] pair : otherEntries) {
+          if (type != TYPE_JAR || !JarFile.MANIFEST_NAME.equalsIgnoreCase(pair[1])) {
+            resultSaver.copyEntry(pair[0], archivePath, filename, pair[1]);
           }
         }
 
         // classes
         for (int i = 0; i < classes.size(); i++) {
-
           StructClass cl = classes.get(i);
-          String entryname = classentries.get(i);
-
-          entryname = decompiledData.getClassEntryName(cl, entryname);
-          if (entryname != null) {
+          String entryName = decompiledData.getClassEntryName(cl, classEntries.get(i));
+          if (entryName != null) {
             String content = decompiledData.getClassContent(cl);
-            decompilatSaver.saveClassEntry(archivepath, filename, cl.qualifiedName, entryname, content);
+            resultSaver.saveClassEntry(archivePath, filename, cl.qualifiedName, entryName, content);
           }
         }
 
-        decompilatSaver.closeArchive(archivepath, filename);
+        resultSaver.closeArchive(archivePath, filename);
     }
   }
 
-  // *****************************************************************************
-  // private methods
-  // *****************************************************************************
-
-  // *****************************************************************************
-  // getter and setter methods
-  // *****************************************************************************
-
   public void setManifest(Manifest manifest) {
     this.manifest = manifest;
   }
@@ -204,16 +162,4 @@ public class ContextUnit {
   public List<StructClass> getClasses() {
     return classes;
   }
-
-  public int getType() {
-    return type;
-  }
-
-  public void setDecompilatSaver(IDecompilatSaver decompilatSaver) {
-    this.decompilatSaver = decompilatSaver;
-  }
-
-  public void setDecompiledData(IDecompiledData decompiledData) {
-    this.decompiledData = decompiledData;
-  }
 }
diff --git a/src/org/jetbrains/java/decompiler/struct/StructClass.java b/src/org/jetbrains/java/decompiler/struct/StructClass.java
index 9afe081..cb24ff6 100644
--- a/src/org/jetbrains/java/decompiler/struct/StructClass.java
+++ b/src/org/jetbrains/java/decompiler/struct/StructClass.java
@@ -24,7 +24,6 @@ import org.jetbrains.java.decompiler.util.InterpreterUtil;
 import org.jetbrains.java.decompiler.util.VBStyleCollection;
 
 import java.io.IOException;
-import java.io.InputStream;
 
 /*
   class_file {
@@ -62,8 +61,8 @@ public class StructClass extends StructMember {
 
   private ConstantPool pool;
 
-  public StructClass(InputStream inStream, boolean own, LazyLoader loader) throws IOException {
-    this(new DataInputFullStream(inStream), own, loader);
+  public StructClass(byte[] bytes, boolean own, LazyLoader loader) throws IOException {
+    this(new DataInputFullStream(bytes), own, loader);
   }
 
   public StructClass(DataInputFullStream in, boolean own, LazyLoader loader) throws IOException {
diff --git a/src/org/jetbrains/java/decompiler/struct/StructContext.java b/src/org/jetbrains/java/decompiler/struct/StructContext.java
index da562e9..7bfb139 100644
--- a/src/org/jetbrains/java/decompiler/struct/StructContext.java
+++ b/src/org/jetbrains/java/decompiler/struct/StructContext.java
@@ -16,65 +16,50 @@
 package org.jetbrains.java.decompiler.struct;
 
 import org.jetbrains.java.decompiler.main.DecompilerContext;
-import org.jetbrains.java.decompiler.main.extern.IDecompilatSaver;
-import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 import org.jetbrains.java.decompiler.struct.lazy.LazyLoader;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
+import org.jetbrains.java.decompiler.util.InterpreterUtil;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Enumeration;
 import java.util.HashMap;
+import java.util.Map;
 import java.util.jar.JarFile;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 
-
 public class StructContext {
 
-  // *****************************************************************************
-  // private fields
-  // *****************************************************************************
-
-  private LazyLoader loader;
-
-  private HashMap<String, StructClass> classes = new HashMap<String, StructClass>();
-
-  private HashMap<String, ContextUnit> units = new HashMap<String, ContextUnit>();
-
-  private IDecompilatSaver saver;
-
-  private IDecompiledData decdata;
-
-  public StructContext(IDecompilatSaver saver, IDecompiledData decdata, LazyLoader loader) {
+  private final IResultSaver saver;
+  private final IDecompiledData decompiledData;
+  private final LazyLoader loader;
+  private final Map<String, ContextUnit> units = new HashMap<String, ContextUnit>();
+  private final Map<String, StructClass> classes = new HashMap<String, StructClass>();
 
+  public StructContext(IResultSaver saver, IDecompiledData decompiledData, LazyLoader loader) {
     this.saver = saver;
-    this.decdata = decdata;
+    this.decompiledData = decompiledData;
     this.loader = loader;
 
-    ContextUnit defaultUnit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, "", true, saver, decdata);
+    ContextUnit defaultUnit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, "", true, saver, decompiledData);
     units.put("", defaultUnit);
   }
 
-  // *****************************************************************************
-  // public methods
-  // *****************************************************************************
-
   public StructClass getClass(String name) {
     return classes.get(name);
   }
 
   public void reloadContext() throws IOException {
-
     for (ContextUnit unit : units.values()) {
-
       for (StructClass cl : unit.getClasses()) {
         classes.remove(cl.qualifiedName);
       }
 
       unit.reload(loader);
 
-      // adjust lobal class collection
+      // adjust global class collection
       for (StructClass cl : unit.getClasses()) {
         classes.put(cl.qualifiedName, cl);
       }
@@ -82,7 +67,6 @@ public class StructContext {
   }
 
   public void saveContext() {
-
     for (ContextUnit unit : units.values()) {
       if (unit.isOwn()) {
         unit.save();
@@ -90,134 +74,116 @@ public class StructContext {
     }
   }
 
-  public void addSpace(File file, boolean isOwn) throws IOException {
-    addSpace("", file, isOwn);
+  public void addSpace(File file, boolean isOwn) {
+    addSpace("", file, isOwn, 0);
   }
 
-  private void addSpace(String path, File file, boolean isOwn) throws IOException {
-
+  private void addSpace(String path, File file, boolean isOwn, int level) {
     if (file.isDirectory()) {
+      if (level == 1) path += file.getName();
+      else if (level > 1) path += "/" + file.getName();
 
       File[] files = file.listFiles();
-      path += "/" + (path.length() == 0 ? "" : file.getName());
-
-      for (int i = files.length - 1; i >= 0; i--) {
-        addSpace(path, files[i], isOwn);
+      if (files != null) {
+        for (int i = files.length - 1; i >= 0; i--) {
+          addSpace(path, files[i], isOwn, level + 1);
+        }
       }
     }
     else {
-
       String filename = file.getName();
 
       boolean isArchive = false;
-
       try {
         if (filename.endsWith(".jar")) {
-          addArchive(path, file, ContextUnit.TYPE_JAR, isOwn);
           isArchive = true;
+          addArchive(path, file, ContextUnit.TYPE_JAR, isOwn);
         }
         else if (filename.endsWith(".zip")) {
-          addArchive(path, file, ContextUnit.TYPE_ZIP, isOwn);
           isArchive = true;
+          addArchive(path, file, ContextUnit.TYPE_ZIP, isOwn);
         }
       }
       catch (IOException ex) {
-        DecompilerContext.getLogger()
-          .writeMessage("Invalid archive file: " + (path.length() > 0 ? path + "/" : "") + filename, IFernflowerLogger.ERROR);
+        String message = "Corrupted archive file: " + file;
+        DecompilerContext.getLogger().writeMessage(message, ex);
+      }
+      if (isArchive) {
+        return;
       }
 
-      if (!isArchive) {
-        ContextUnit unit = units.get(path);
-        if (unit == null) {
-          unit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, path, isOwn, saver, decdata);
-          units.put(path, unit);
-        }
-
-        boolean isClass = false;
+      ContextUnit unit = units.get(path);
+      if (unit == null) {
+        unit = new ContextUnit(ContextUnit.TYPE_FOLDER, null, path, isOwn, saver, decompiledData);
+        units.put(path, unit);
+      }
 
-        if (filename.endsWith(".class")) {
+      if (filename.endsWith(".class")) {
+        try {
+          DataInputFullStream in = loader.getClassStream(file.getAbsolutePath(), null);
           try {
-            StructClass cl;
-
-            DataInputFullStream in = loader.getClassStream(file.getAbsolutePath(), null);
-            try {
-              cl = new StructClass(in, isOwn, loader);
-            }
-            finally {
-              in.close();
-            }
-
+            StructClass cl = new StructClass(in, isOwn, loader);
             classes.put(cl.qualifiedName, cl);
             unit.addClass(cl, filename);
             loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(LazyLoader.Link.CLASS, file.getAbsolutePath(), null));
-
-            isClass = true;
           }
-          catch (IOException ex) {
-            DecompilerContext.getLogger().writeMessage("Invalid class file: " + (path.length() > 0 ? path + "/" : "") + filename,
-                                                       IFernflowerLogger.ERROR);
+          finally {
+            in.close();
           }
         }
-
-        if (!isClass) {
-          unit.addOtherEntry(file.getAbsolutePath(), filename);
+        catch (IOException ex) {
+          String message = "Corrupted class file: " + file;
+          DecompilerContext.getLogger().writeMessage(message, ex);
         }
       }
+      else {
+        unit.addOtherEntry(file.getAbsolutePath(), filename);
+      }
     }
   }
 
-
   private void addArchive(String path, File file, int type, boolean isOwn) throws IOException {
+    @SuppressWarnings("IOResourceOpenedButNotSafelyClosed")
+    ZipFile archive = type == ContextUnit.TYPE_JAR ? new JarFile(file) : new ZipFile(file);
 
-    ZipFile archive;
-
-    if (type == ContextUnit.TYPE_JAR) {  // jar
-      archive = new JarFile(file);
-    }
-    else {  // zip
-      archive = new ZipFile(file);
-    }
-
-    Enumeration<? extends ZipEntry> en = archive.entries();
-    while (en.hasMoreElements()) {
-      ZipEntry entr = en.nextElement();
+    try {
+      Enumeration<? extends ZipEntry> entries = archive.entries();
+      while (entries.hasMoreElements()) {
+        ZipEntry entry = entries.nextElement();
 
-      ContextUnit unit = units.get(path + "/" + file.getName());
-      if (unit == null) {
-        unit = new ContextUnit(type, path, file.getName(), isOwn, saver, decdata);
-        if (type == ContextUnit.TYPE_JAR) {
-          unit.setManifest(((JarFile)archive).getManifest());
+        ContextUnit unit = units.get(path + "/" + file.getName());
+        if (unit == null) {
+          unit = new ContextUnit(type, path, file.getName(), isOwn, saver, decompiledData);
+          if (type == ContextUnit.TYPE_JAR) {
+            unit.setManifest(((JarFile)archive).getManifest());
+          }
+          units.put(path + "/" + file.getName(), unit);
         }
-        units.put(path + "/" + file.getName(), unit);
-      }
-
-      String name = entr.getName();
-      if (!entr.isDirectory()) {
-        if (name.endsWith(".class")) {
-          StructClass cl = new StructClass(archive.getInputStream(entr), isOwn, loader);
-          classes.put(cl.qualifiedName, cl);
-
-          unit.addClass(cl, name);
 
-          if (loader != null) {
+        String name = entry.getName();
+        if (!entry.isDirectory()) {
+          if (name.endsWith(".class")) {
+            byte[] bytes = InterpreterUtil.getBytes(archive, entry);
+            StructClass cl = new StructClass(bytes, isOwn, loader);
+            classes.put(cl.qualifiedName, cl);
+            unit.addClass(cl, name);
             loader.addClassLink(cl.qualifiedName, new LazyLoader.Link(LazyLoader.Link.ENTRY, file.getAbsolutePath(), name));
           }
+          else {
+            unit.addOtherEntry(file.getAbsolutePath(), name);
+          }
         }
         else {
-          unit.addOtherEntry(file.getAbsolutePath(), name);
+          unit.addDirEntry(name);
         }
       }
-      else if (entr.isDirectory()) {
-        unit.addDirEntry(name);
-      }
+    }
+    finally {
+      archive.close();
     }
   }
 
-  // *****************************************************************************
-  // getter and setter methods
-  // *****************************************************************************
-
-  public HashMap<String, StructClass> getClasses() {
+  public Map<String, StructClass> getClasses() {
     return classes;
   }
 }
diff --git a/src/org/jetbrains/java/decompiler/struct/StructMethod.java b/src/org/jetbrains/java/decompiler/struct/StructMethod.java
index 3ca4a32..2b5249f 100644
--- a/src/org/jetbrains/java/decompiler/struct/StructMethod.java
+++ b/src/org/jetbrains/java/decompiler/struct/StructMethod.java
@@ -21,7 +21,6 @@ import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
 import org.jetbrains.java.decompiler.util.VBStyleCollection;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
@@ -106,7 +105,7 @@ public class StructMethod extends StructMember {
   public void expandData() throws IOException {
     if (containsCode && !expanded) {
       byte[] code = classStruct.getLoader().loadBytecode(this, codeFullLength);
-      seq = parseBytecode(new DataInputFullStream(new ByteArrayInputStream(code)), codeLength, classStruct.getPool());
+      seq = parseBytecode(new DataInputFullStream(code), codeLength, classStruct.getPool());
       expanded = true;
     }
   }
diff --git a/src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java b/src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java
index 5d43100..2cdc524 100644
--- a/src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java
+++ b/src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java
@@ -18,7 +18,6 @@ package org.jetbrains.java.decompiler.struct.attr;
 import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
 
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
 
 /*
@@ -104,7 +103,7 @@ public class StructGeneralAttribute {
   }
 
   protected DataInputFullStream stream() {
-    return new DataInputFullStream(new ByteArrayInputStream(info));
+    return new DataInputFullStream(info);
   }
 
   public void initContent(ConstantPool pool) throws IOException { }
diff --git a/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java b/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
index f610900..70254d8 100644
--- a/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
+++ b/src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java
@@ -22,14 +22,13 @@ import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
 import org.jetbrains.java.decompiler.util.DataInputFullStream;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.util.HashMap;
 import java.util.Map;
 
 public class LazyLoader {
 
-  private Map<String, Link> mapClassLinks = new HashMap<String, Link>();
-  private IBytecodeProvider provider;
+  private final Map<String, Link> mapClassLinks = new HashMap<String, Link>();
+  private final IBytecodeProvider provider;
 
   public LazyLoader(IBytecodeProvider provider) {
     this.provider = provider;
@@ -138,10 +137,9 @@ public class LazyLoader {
     }
   }
 
-  @SuppressWarnings("IOResourceOpenedButNotSafelyClosed")
   public DataInputFullStream getClassStream(String externalPath, String internalPath) throws IOException {
-    InputStream stream = provider.getBytecodeStream(externalPath, internalPath);
-    return stream == null ? null : new DataInputFullStream(stream);
+    byte[] bytes = provider.getBytecode(externalPath, internalPath);
+    return new DataInputFullStream(bytes);
   }
 
   public DataInputFullStream getClassStream(String qualifiedClassName) throws IOException {
diff --git a/src/org/jetbrains/java/decompiler/util/DataInputFullStream.java b/src/org/jetbrains/java/decompiler/util/DataInputFullStream.java
index 79e8c1d..011edde 100644
--- a/src/org/jetbrains/java/decompiler/util/DataInputFullStream.java
+++ b/src/org/jetbrains/java/decompiler/util/DataInputFullStream.java
@@ -15,14 +15,14 @@
  */
 package org.jetbrains.java.decompiler.util;
 
+import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
-import java.io.InputStream;
 
 public class DataInputFullStream extends DataInputStream {
 
-  public DataInputFullStream(InputStream in) {
-    super(in);
+  public DataInputFullStream(byte[] bytes) {
+    super(new ByteArrayInputStream(bytes));
   }
 
   public int readFull(byte[] b) throws IOException {
diff --git a/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java b/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
index 5f48e32..0047bb7 100644
--- a/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
+++ b/src/org/jetbrains/java/decompiler/util/InterpreterUtil.java
@@ -23,6 +23,8 @@ import java.nio.channels.FileChannel;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
 
 public class InterpreterUtil {
   public static final boolean IS_WINDOWS = System.getProperty("os.name", "").startsWith("Windows");
@@ -59,13 +61,36 @@ public class InterpreterUtil {
     }
   }
 
+  public static byte[] getBytes(ZipFile archive, ZipEntry entry) throws IOException {
+    return readAndClose(archive.getInputStream(entry), entry.getSize());
+  }
+
+  public static byte[] getBytes(File file) throws IOException {
+    return readAndClose(new FileInputStream(file), file.length());
+  }
+
+  private static byte[] readAndClose(InputStream stream, long length) throws IOException {
+    try {
+      byte[] bytes = new byte[(int)length];
+      if (stream.read(bytes) != length) {
+        throw new IOException("premature end of stream");
+      }
+      return bytes;
+    }
+    finally {
+      stream.close();
+    }
+  }
+
   public static String getIndentString(int length) {
+    if (length == 0) return "";
     StringBuilder buf = new StringBuilder();
     appendIndent(buf, length);
     return buf.toString();
   }
 
   public static void appendIndent(StringBuilder buffer, int length) {
+    if (length == 0) return;
     String indent = (String)DecompilerContext.getProperty(IFernflowerPreferences.INDENT_STRING);
     while (length-- > 0) {
       buffer.append(indent);