Patch to OpenJDK6 sun.misc.Unsafe class that restores additional copyMemory method

sun.misc.Unsafe.diff

diff --git a/jdk/src/share/classes/sun/misc/Unsafe.java b/jdk/src/share/classes/sun/misc/Unsafe.java
index 345f654..5b6b54a 100644
--- a/jdk/src/share/classes/sun/misc/Unsafe.java
+++ b/jdk/src/share/classes/sun/misc/Unsafe.java
@@ -502,11 +502,41 @@ public final class Unsafe {
     public native void setMemory(long address, long bytes, byte value);
 
     /**
+     * alexkasko: reverting changes to match jdk7 signature
+     * http://hg.openjdk.java.net/jdk6/jdk6/jdk/diff/39e8fe7a0af1/src/share/classes/sun/misc/Unsafe.java
+     *
      * Sets all bytes in a given block of memory to a copy of another
      * block.
+     *
+     * <p>This method determines each block's base address by means of two parameters,
+     * and so it provides (in effect) a <em>double-register</em> addressing mode,
+     * as discussed in {@link #getInt(Object,long)}. When the object reference is null,
+     * the offset supplies an absolute base address.
+     *
+     * <p>The transfers are in coherent (atomic) units of a size determined
+     * by the address and length parameters. If the effective addresses and
+     * length are all even modulo 8, the transfer takes place in 'long' units.
+     * If the effective addresses and length are (resp.) even modulo 4 or 2,
+     * the transfer takes place in units of 'int' or 'short'.
+     *
+     * @since 1.7
      */
-    public native void copyMemory(long srcAddress, long destAddress,
+    public native void copyMemory(Object srcBase, long srcOffset,
+                                  Object destBase, long destOffset,
                                   long bytes);
+    /**
+     * alexkasko: reverting changes to match jdk7 signature
+     * http://hg.openjdk.java.net/jdk6/jdk6/jdk/diff/39e8fe7a0af1/src/share/classes/sun/misc/Unsafe.java
+     *
+     * Sets all bytes in a given block of memory to a copy of another
+     * block. This provides a <em>single-register</em> addressing mode,
+     * as discussed in {@link #getInt(Object,long)}.
+     *
+     * Equivalent to <code>copyMemory(null, srcAddress, null, destAddress, bytes)</code>.
+     */
+    public void copyMemory(long srcAddress, long destAddress, long bytes) {
+        copyMemory(null, srcAddress, null, destAddress, bytes);
+    }
 
     /**
      * Disposes of a block of native memory, as obtained from {@link