Cleanup (I/O ops in java-decompiler)

src/org/jetbrains/java/decompiler/main/decompiler/ConsoleDecompiler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -150,17 +150,11 @@ public class ConsoleDecompiler implements IBytecodeProvider, IResultSaver {
       return InterpreterUtil.getBytes(file);
     }
     else {
-      ZipFile archive = new ZipFile(file);
-      try {
+      try (ZipFile archive = new ZipFile(file)) {
         ZipEntry entry = archive.getEntry(internalPath);
-        if (entry == null) {
-          throw new IOException("Entry not found: " + internalPath);
-        }
+        if (entry == null) throw new IOException("Entry not found: " + internalPath);
         return InterpreterUtil.getBytes(archive, entry);
       }
-      finally {
-        archive.close();
-      }
     }
   }
 
@@ -193,15 +187,9 @@ public class ConsoleDecompiler implements IBytecodeProvider, IResultSaver {
   @Override
   public void saveClassFile(String path, String qualifiedName, String entryName, String content, int[] mapping) {
     File file = new File(getAbsolutePath(path), entryName);
-    try {
-      Writer out = new OutputStreamWriter(new FileOutputStream(file), "UTF8");
-      try {
+    try (Writer out = new OutputStreamWriter(new FileOutputStream(file), "UTF8")) {
       out.write(content);
     }
-      finally {
-        out.close();
-      }
-    }
     catch (IOException ex) {
       DecompilerContext.getLogger().writeMessage("Cannot write class file " + file, ex);
     }
@@ -238,20 +226,14 @@ public class ConsoleDecompiler implements IBytecodeProvider, IResultSaver {
       return;
     }
 
-    try {
-      ZipFile srcArchive = new ZipFile(new File(source));
-      try {
+    try (ZipFile srcArchive = new ZipFile(new File(source))) {
       ZipEntry entry = srcArchive.getEntry(entryName);
       if (entry != null) {
-          InputStream in = srcArchive.getInputStream(entry);
+        try (InputStream in = srcArchive.getInputStream(entry)) {
           ZipOutputStream out = mapArchiveStreams.get(file);
           out.putNextEntry(new ZipEntry(entryName));
           InterpreterUtil.copyStream(in, out);
-          in.close();
-        }
         }
-      finally {
-        srcArchive.close();
       }
     }
     catch (IOException ex) {

src/org/jetbrains/java/decompiler/struct/ContextUnit.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -78,13 +78,9 @@ public class ContextUnit {
       String oldName = cl.qualifiedName;
 
       StructClass newCl;
-      DataInputFullStream in = loader.getClassStream(oldName);
-      try {
+      try (DataInputFullStream in = loader.getClassStream(oldName)) {
         newCl = new StructClass(in, cl.isOwn(), loader);
       }
-      finally {
-        in.close();
-      }
 
       lstClasses.add(newCl);
 

src/org/jetbrains/java/decompiler/struct/StructContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -119,18 +119,12 @@ public class StructContext {
       }
 
       if (filename.endsWith(".class")) {
-        try {
-          DataInputFullStream in = loader.getClassStream(file.getAbsolutePath(), null);
-          try {
+        try (DataInputFullStream in = loader.getClassStream(file.getAbsolutePath(), null)) {
           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));
         }
-          finally {
-            in.close();
-          }
-        }
         catch (IOException ex) {
           String message = "Corrupted class file: " + file;
           DecompilerContext.getLogger().writeMessage(message, ex);
@@ -143,10 +137,8 @@ public class StructContext {
   }
 
   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);
-
-    try {
+    //noinspection IOResourceOpenedButNotSafelyClosed
+    try (ZipFile archive = type == ContextUnit.TYPE_JAR ? new JarFile(file) : new ZipFile(file)) {
       Enumeration<? extends ZipEntry> entries = archive.entries();
       while (entries.hasMoreElements()) {
         ZipEntry entry = entries.nextElement();
@@ -178,9 +170,6 @@ public class StructContext {
         }
       }
     }
-    finally {
-      archive.close();
-    }
   }
 
   public Map<String, StructClass> getClasses() {

src/org/jetbrains/java/decompiler/struct/StructMember.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -73,12 +73,12 @@ public class StructMember {
 
   protected StructGeneralAttribute readAttribute(DataInputFullStream in, ConstantPool pool, String name) throws IOException {
     StructGeneralAttribute attribute = StructGeneralAttribute.createAttribute(name);
+    int length = in.readInt();
     if (attribute == null) {
-      in.discard(in.readInt());
+      in.discard(length);
     }
     else {
-      byte[] data = new byte[in.readInt()];
-      in.readFull(data);
+      byte[] data = in.read(length);
       attribute.setInfo(data);
       attribute.initContent(pool);
     }

src/org/jetbrains/java/decompiler/struct/lazy/LazyLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -47,17 +47,13 @@ public class LazyLoader {
   }
 
   public ConstantPool loadPool(String classname) {
-    try {
-      DataInputFullStream in = getClassStream(classname);
-      if (in == null) return null;
-
-      try {
+    try (DataInputFullStream in = getClassStream(classname)) {
+      if (in != null) {
         in.discard(8);
         return new ConstantPool(in);
       }
-      finally {
-        in.close();
-      }
+
+      return null;
     }
     catch (IOException ex) {
       throw new RuntimeException(ex);
@@ -67,11 +63,8 @@ public class LazyLoader {
   public byte[] loadBytecode(StructMethod mt, int codeFullLength) {
     String className = mt.getClassStruct().qualifiedName;
 
-    try {
-      DataInputFullStream in = getClassStream(className);
-      if (in == null) return null;
-
-      try {
+    try (DataInputFullStream in = getClassStream(className)) {
+      if (in != null) {
         in.discard(8);
 
         ConstantPool pool = mt.getClassStruct().getPool();
@@ -118,17 +111,13 @@ public class LazyLoader {
             }
 
             in.discard(12);
-            byte[] code = new byte[codeFullLength];
-            in.readFull(code);
-            return code;
+
+            return in.read(codeFullLength);
           }
 
           break;
         }
       }
-      finally {
-        in.close();
-      }
 
       return null;
     }

src/org/jetbrains/java/decompiler/util/DataInputFullStream.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -20,36 +20,15 @@ import java.io.DataInputStream;
 import java.io.IOException;
 
 public class DataInputFullStream extends DataInputStream {
-
   public DataInputFullStream(byte[] bytes) {
     super(new ByteArrayInputStream(bytes));
   }
 
-  public int readFull(byte[] b) throws IOException {
-    int length = b.length;
-    byte[] temp = new byte[length];
-    int pos = 0;
-
-    int bytes_read;
-    while (true) {
-      bytes_read = read(temp, 0, length - pos);
-      if (bytes_read == -1) {
-        return -1;
-      }
-
-      System.arraycopy(temp, 0, b, pos, bytes_read);
-      pos += bytes_read;
-      if (pos == length) {
-        break;
-      }
-    }
-
-    return length;
+  public byte[] read(int n) throws IOException {
+    return InterpreterUtil.readBytes(this, n);
   }
 
   public void discard(int n) throws IOException {
-    if (super.skip(n) != n) {
-      throw new IOException("Skip failed");
-    }
+    InterpreterUtil.discardBytes(this, n);
   }
 }

src/org/jetbrains/java/decompiler/util/InterpreterUtil.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -19,7 +19,6 @@ import org.jetbrains.java.decompiler.main.DecompilerContext;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
 
 import java.io.*;
-import java.nio.channels.FileChannel;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
@@ -31,27 +30,11 @@ public class InterpreterUtil {
 
   public static final int[] EMPTY_INT_ARRAY = new int[0];
 
-  private static final int CHANNEL_WINDOW_SIZE = IS_WINDOWS ? 64 * 1024 * 1024 - (32 * 1024) : 64 * 1024 * 1024;  // magic number for Windows
   private static final int BUFFER_SIZE = 16 * 1024;
 
-  public static void copyFile(File in, File out) throws IOException {
-    FileInputStream inStream = new FileInputStream(in);
-    try {
-      FileOutputStream outStream = new FileOutputStream(out);
-      try {
-        FileChannel inChannel = inStream.getChannel();
-        FileChannel outChannel = outStream.getChannel();
-        long size = inChannel.size(), position = 0;
-        while (position < size) {
-          position += inChannel.transferTo(position, CHANNEL_WINDOW_SIZE, outChannel);
-        }
-      }
-      finally {
-        outStream.close();
-      }
-    }
-    finally {
-      inStream.close();
+  public static void copyFile(File source, File target) throws IOException {
+    try (FileInputStream in = new FileInputStream(source); FileOutputStream out = new FileOutputStream(target)) {
+      copyStream(in, out);
     }
   }
 
@@ -64,16 +47,20 @@ public class InterpreterUtil {
   }
 
   public static byte[] getBytes(ZipFile archive, ZipEntry entry) throws IOException {
-    return readAndClose(archive.getInputStream(entry), (int)entry.getSize());
+    try (InputStream stream = archive.getInputStream(entry)) {
+      return readBytes(stream, (int)entry.getSize());
+    }
   }
 
   public static byte[] getBytes(File file) throws IOException {
-    return readAndClose(new FileInputStream(file), (int)file.length());
+    try (FileInputStream stream = new FileInputStream(file)) {
+      return readBytes(stream, (int)file.length());
+    }
   }
 
-  private static byte[] readAndClose(InputStream stream, int length) throws IOException {
-    try {
+  public static byte[] readBytes(InputStream stream, int length) throws IOException {
     byte[] bytes = new byte[length];
+
     int n = 0, off = 0;
     while (n < length) {
       int count = stream.read(bytes, off + n, length - n);
@@ -82,10 +69,13 @@ public class InterpreterUtil {
       }
       n += count;
     }
+
     return bytes;
   }
-    finally {
-      stream.close();
+
+  public static void discardBytes(InputStream stream, int length) throws IOException {
+    if (stream.skip(length) != length) {
+      throw new IOException("premature end of stream");
     }
   }
 

test/org/jetbrains/java/decompiler/BulkDecompilationTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2015 JetBrains s.r.o.
+ * Copyright 2000-2016 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.
@@ -69,26 +69,18 @@ public class BulkDecompilationTest {
   }
 
   private static void unpack(File archive, File targetDir) {
-    try {
-      ZipFile zip = new ZipFile(archive);
-      try {
+    try (ZipFile zip = new ZipFile(archive)) {
       Enumeration<? extends ZipEntry> entries = zip.entries();
       while (entries.hasMoreElements()) {
         ZipEntry entry = entries.nextElement();
         if (!entry.isDirectory()) {
           File file = new File(targetDir, entry.getName());
           assertTrue(file.getParentFile().mkdirs() || file.getParentFile().isDirectory());
-            InputStream in = zip.getInputStream(entry);
-            OutputStream out = new FileOutputStream(file);
+          try (InputStream in = zip.getInputStream(entry); OutputStream out = new FileOutputStream(file)) {
             InterpreterUtil.copyStream(in, out);
-            out.close();
-            in.close();
           }
         }
       }
-      finally {
-        zip.close();
-      }
     }
     catch (IOException e) {
       throw new RuntimeException(e);