--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/nio/ch/ChannelInputStream.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2001, 2002, 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 sun.nio.ch;
+
+import java.io.*;
+import java.nio.*;
+import java.nio.channels.*;
+import java.nio.channels.spi.*;
+
+
+/**
+ * This class is defined here rather than in java.nio.channels.Channels
+ * so that code can be shared with SocketAdaptor.
+ *
+ * @author Mike McCloskey
+ * @author Mark Reinhold
+ * @since 1.4
+ */
+
+public class ChannelInputStream
+    extends InputStream
+{
+
+    public static int read(ReadableByteChannel ch, ByteBuffer bb,
+                           boolean block)
+        throws IOException
+    {
+        if (ch instanceof SelectableChannel) {
+            SelectableChannel sc = (SelectableChannel)ch;
+            synchronized (sc.blockingLock()) {
+                boolean bm = sc.isBlocking();
+                if (!bm)
+                    throw new IllegalBlockingModeException();
+                if (bm != block)
+                    sc.configureBlocking(block);
+                int n = ch.read(bb);
+                if (bm != block)
+                    sc.configureBlocking(bm);
+                return n;
+            }
+        } else {
+            return ch.read(bb);
+        }
+    }
+
+    protected final ReadableByteChannel ch;
+    private ByteBuffer bb = null;
+    private byte[] bs = null;           // Invoker's previous array
+    private byte[] b1 = null;
+
+    public ChannelInputStream(ReadableByteChannel ch) {
+        this.ch = ch;
+    }
+
+    public synchronized int read() throws IOException {
+        if (b1 == null)
+            b1 = new byte[1];
+        int n = this.read(b1);
+        if (n == 1)
+            return b1[0] & 0xff;
+        return -1;
+    }
+
+    public synchronized int read(byte[] bs, int off, int len)
+        throws IOException
+    {
+        if ((off < 0) || (off > bs.length) || (len < 0) ||
+            ((off + len) > bs.length) || ((off + len) < 0)) {
+            throw new IndexOutOfBoundsException();
+        } else if (len == 0)
+            return 0;
+
+        ByteBuffer bb = ((this.bs == bs)
+                         ? this.bb
+                         : ByteBuffer.wrap(bs));
+        bb.limit(Math.min(off + len, bb.capacity()));
+        bb.position(off);
+        this.bb = bb;
+        this.bs = bs;
+        return read(bb);
+    }
+
+    protected int read(ByteBuffer bb)
+        throws IOException
+    {
+        return ChannelInputStream.read(ch, bb, true);
+    }
+
+    public int available() throws IOException {
+        // special case where the channel is to a file
+        if (ch instanceof SeekableByteChannel) {
+            SeekableByteChannel sbc = (SeekableByteChannel)ch;
+            long rem = Math.max(0, sbc.size() - sbc.position());
+            return (rem > Integer.MAX_VALUE) ? Integer.MAX_VALUE : (int)rem;
+        }
+        return 0;
+    }
+
+    public void close() throws IOException {
+        ch.close();
+    }
+
+}