--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/nio/channels/FileChannel/Pread.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2000-2001 Sun Microsystems, Inc.  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.
+ *
+ * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 4862382 4862408
+ * @summary Test positional read method of FileChannel
+ */
+
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.channels.*;
+import java.nio.channels.FileChannel;
+import java.util.Random;
+
+
+/**
+ * Testing FileChannel's positional read method.
+ */
+
+public class Pread {
+
+    private static PrintStream err = System.err;
+
+    private static Random generator = new Random();
+
+    private static int CHARS_PER_LINE = File.separatorChar == '/' ? 5 : 6;
+
+    public static void main(String[] args) throws Exception {
+        genericTest();
+        testNegativePosition(); // This test for bug 4862382
+        testUnreadableChannel();// This test for bug 4862408
+    }
+
+    // This test for bug 4862382
+    private static void testNegativePosition() throws Exception {
+        File blah = File.createTempFile("blah1", null);
+        blah.deleteOnExit();
+        FileOutputStream fos = new FileOutputStream(blah);
+        fos.write(new byte[128]);
+        fos.close();
+        FileChannel fc = (new FileInputStream(blah)).getChannel();
+        try {
+            fc.read(ByteBuffer.allocate(256), -1L);
+            throw new RuntimeException("Expected exception not thrown");
+        } catch(IllegalArgumentException e) {
+            // Correct result
+        }
+    }
+
+    // This test for bug 4862408
+    private static void testUnreadableChannel() throws Exception {
+        File blah = File.createTempFile("blah2", null);
+        blah.deleteOnExit();
+        FileOutputStream fos = new FileOutputStream(blah);
+        fos.write(new byte[128]);
+        FileChannel fc = fos.getChannel();
+        try {
+            fc.read(ByteBuffer.allocate(256),1);
+            throw new RuntimeException("Expected exception not thrown");
+        } catch(NonReadableChannelException e) {
+            // Correct result
+        }
+    }
+
+    private static void genericTest() throws Exception {
+        StringBuffer sb = new StringBuffer();
+        sb.setLength(4);
+
+        File blah = File.createTempFile("blah3", null);
+        blah.deleteOnExit();
+        initTestFile(blah);
+
+        FileInputStream fis = new FileInputStream(blah);
+        FileChannel c = fis.getChannel();
+
+        for (int x=0; x<100; x++) {
+            long offset = generator.nextInt(1000);
+            long expectedResult = offset / CHARS_PER_LINE;
+            offset = expectedResult * CHARS_PER_LINE;
+            ByteBuffer bleck = ByteBuffer.allocateDirect(4);
+
+            long originalPosition = c.position();
+
+            int totalRead = 0;
+            while (totalRead < 4) {
+                int read = c.read(bleck, offset);
+                if (read < 0)
+                    throw new Exception("Read failed");
+                totalRead += read;
+            }
+
+            long newPosition = c.position();
+
+            for (int i=0; i<4; i++) {
+                byte aByte = bleck.get(i);
+                sb.setCharAt(i, (char)aByte);
+            }
+            int result = Integer.parseInt(sb.toString());
+            if (result != expectedResult) {
+                err.println("I expected "+ expectedResult);
+                err.println("I got "+ result);
+                throw new Exception("Read test failed");
+            }
+
+            // Ensure that file pointer position has not changed
+            if (originalPosition != newPosition)
+                throw new Exception("File position modified");
+        }
+
+        c.close();
+        fis.close();
+    }
+
+    /**
+     * Creates file blah:
+     * 0000
+     * 0001
+     * 0002
+     * 0003
+     * .
+     * .
+     * .
+     * 3999
+     *
+     * Blah extends beyond a single page of memory so that the
+     * ability to index into a file of multiple pages is tested.
+     */
+    private static void initTestFile(File blah) throws Exception {
+        FileOutputStream fos = new FileOutputStream(blah);
+        BufferedWriter awriter
+            = new BufferedWriter(new OutputStreamWriter(fos, "8859_1"));
+
+        for(int i=0; i<4000; i++) {
+            String number = new Integer(i).toString();
+            for (int h=0; h<4-number.length(); h++)
+                awriter.write("0");
+            awriter.write(""+i);
+            awriter.newLine();
+        }
+       awriter.flush();
+       awriter.close();
+    }
+}