Util: Fix memory leak in compressor (ticket #2471)

core/java/src/net/i2p/util/ResettableGZIPInputStream.java

@@ -168,6 +168,15 @@ public class ResettableGZIPInputStream extends InflaterInputStream {
         }
     }
 
+    /**
+     *  Calls super.close(). May not be reused after this.
+     *  @since 0.9.40
+     */
+    public void destroy() throws IOException {
+        close();
+        super.close();
+    }
+
     /**
      *  Does NOT call super.close(), as it cannot be reused if we do that.
      *  Broken before 0.9.20.

core/java/src/net/i2p/util/ResettableGZIPOutputStream.java

@@ -18,6 +18,7 @@ import java.util.zip.DeflaterOutputStream;
 public class ResettableGZIPOutputStream extends DeflaterOutputStream {
     /** has the header been written out yet? */
     private boolean _headerWritten;
+    private boolean _footerWritten;
     /** how much data is in the uncompressed stream? */
     private long _writtenSize;
     private final CRC32 _crc32;
@@ -39,6 +40,7 @@ public class ResettableGZIPOutputStream extends DeflaterOutputStream {
         _crc32.reset();
         _writtenSize = 0;
         _headerWritten = false;
+        _footerWritten = false;
     }
     
     private static final byte[] HEADER = new byte[] {
@@ -61,6 +63,7 @@ public class ResettableGZIPOutputStream extends DeflaterOutputStream {
     }
     
     private void writeFooter() throws IOException {
+        if (_footerWritten) return;
         // damn RFC writing their bytes backwards...
         long crcVal = _crc32.getValue();
         out.write((int)(crcVal & 0xFF));
@@ -83,6 +86,16 @@ public class ResettableGZIPOutputStream extends DeflaterOutputStream {
             System.out.print(  Long.toHexString((int)((sizeVal >>> 24) & 0xFF)));
             System.out.println();
         }
+        _footerWritten = true;
+    }
+
+    /**
+     *  Calls super.close(). May not be reused after this.
+     *  @since 0.9.40
+     */
+    public void destroy() throws IOException {
+        def.end();
+        super.close();
     }
     
     @Override
@@ -90,6 +103,7 @@ public class ResettableGZIPOutputStream extends DeflaterOutputStream {
         finish();
         super.close();
     }
+
     @Override
     public void finish() throws IOException {
         ensureHeaderIsWritten();
@@ -104,10 +118,12 @@ public class ResettableGZIPOutputStream extends DeflaterOutputStream {
         _writtenSize++;
         super.write(b);
     }
+
     @Override
     public void write(byte buf[]) throws IOException {
         write(buf, 0, buf.length);
     }
+
     @Override
     public void write(byte buf[], int off, int len) throws IOException {
         ensureHeaderIsWritten();

core/java/src/net/i2p/util/ReusableGZIPInputStream.java

@@ -1,5 +1,6 @@
 package net.i2p.util;
 
+import java.io.IOException;
 import java.util.concurrent.LinkedBlockingQueue;
 
 /**
@@ -32,13 +33,21 @@ public class ReusableGZIPInputStream extends ResettableGZIPInputStream {
         } 
         return rv;
     }
+
     /**
      * Release an instance back into the cache (this will reset the 
      * state)
      */
     public static void release(ReusableGZIPInputStream released) {
-        if (ENABLE_CACHING)
-            _available.offer(released);
+        boolean cached;
+        if (ENABLE_CACHING) {
+            cached = _available.offer(released);
+        } else {
+            cached = false;
+        }
+        if (!cached) {
+            try { released.destroy(); } catch (IOException ioe) {}
+        }
     }
     
     private ReusableGZIPInputStream() { super(); }

core/java/src/net/i2p/util/ReusableGZIPOutputStream.java

@@ -2,6 +2,7 @@ package net.i2p.util;
 
 //import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.util.zip.Deflater;
 import java.util.concurrent.LinkedBlockingQueue;
 
@@ -50,9 +51,16 @@ public class ReusableGZIPOutputStream extends ResettableGZIPOutputStream {
      * state)
      */
     public static void release(ReusableGZIPOutputStream out) {
-        out.reset();
-        if (ENABLE_CACHING)
-            _available.offer(out);
+        boolean cached;
+        if (ENABLE_CACHING) {
+            out.reset();
+            cached = _available.offer(out);
+        } else {
+            cached = false;
+        }
+        if (!cached) {
+            try { out.destroy(); } catch (IOException ioe) {}
+        }
     }
     
     private final ByteArrayOutputStream _buffer;