--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/ChunkInputStream.java	2019-01-29 10:59:24.380003771 +0800
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+final class ChunkInputStream extends InputStream {
+    private final Iterator<RepositoryChunk> chunks;
+    private RepositoryChunk currentChunk;
+    private InputStream stream;
+
+    ChunkInputStream(List<RepositoryChunk> chunks) throws IOException {
+        List<RepositoryChunk> l = new ArrayList<>(chunks.size());
+        for (RepositoryChunk c : chunks) {
+            c.use(); // keep alive while we're reading.
+            l.add(c);
+        }
+
+        this.chunks = l.iterator();
+        nextStream();
+    }
+
+    @Override
+    public int available() throws IOException {
+        if (stream != null) {
+            return stream.available();
+        }
+        return 0;
+    }
+
+    private boolean nextStream() throws IOException {
+        if (!nextChunk()) {
+            return false;
+        }
+
+        stream = new BufferedInputStream(SecuritySupport.newFileInputStream(currentChunk.getFile()));
+        return true;
+    }
+
+    private boolean nextChunk() {
+        if (!chunks.hasNext()) {
+            return false;
+        }
+        currentChunk = chunks.next();
+        return true;
+    }
+
+    @Override
+    public int read() throws IOException {
+        while (true) {
+            if (stream != null) {
+                int r = stream.read();
+                if (r != -1) {
+                    return r;
+                }
+                stream.close();
+                currentChunk.release();
+                stream = null;
+                currentChunk = null;
+            }
+            if (!nextStream()) {
+                return -1;
+            }
+        }
+    }
+
+    @Override
+    public void close() throws IOException {
+        if (stream != null) {
+            stream.close();
+            stream = null;
+        }
+        while (currentChunk != null) {
+            currentChunk.release();
+            currentChunk = null;
+            if (!nextChunk()) {
+                return;
+            }
+        }
+    }
+
+    @Override
+    @SuppressWarnings("deprecation")
+    protected void finalize() throws Throwable {
+        super.finalize();
+        close();
+    }
+}