--- xnu/xnu-517.3.7/libkern/c++/OSData.cpp
+++ xnu/xnu-2050.9.2/libkern/c++/OSData.cpp
@@ -1,16 +1,19 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
@@ -20,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* IOData.m created by rsulack on Thu 25-Sep-1997 */
 
@@ -35,7 +38,7 @@
 #define super OSObject
 
 OSDefineMetaClassAndStructors(OSData, OSObject)
-OSMetaClassDefineReservedUnused(OSData, 0);
+OSMetaClassDefineReservedUsed(OSData, 0);    // setDeallocFunction
 OSMetaClassDefineReservedUnused(OSData, 1);
 OSMetaClassDefineReservedUnused(OSData, 2);
 OSMetaClassDefineReservedUnused(OSData, 3);
@@ -53,6 +56,12 @@
 #define ACCUMSIZE(s)
 #endif
 
+struct OSData::ExpansionData
+{
+    DeallocFunction deallocFunction;
+    bool            disableSerialization;
+};
+
 bool OSData::initWithCapacity(unsigned int inCapacity)
 {
     if (!super::init())
@@ -60,7 +69,7 @@
 
     if (data && (!inCapacity || capacity < inCapacity) ) {
         // clean out old data's storage if it isn't big enough
-        kfree((vm_address_t) data, capacity);
+        kfree(data, capacity);
         data = 0;
         ACCUMSIZE(-capacity);
     }
@@ -185,9 +194,15 @@
 void OSData::free()
 {
     if (capacity != EXTERNAL && data && capacity) {
-        kfree((vm_offset_t)data, capacity);
+        kfree(data, capacity);
         ACCUMSIZE( -capacity );
-    }
+    } else if (capacity == EXTERNAL) {
+	DeallocFunction freemem = reserved ? reserved->deallocFunction : NULL;
+	if (freemem && data && length) {
+		freemem(data, length);
+	}
+    }
+    if (reserved) kfree(reserved, sizeof(ExpansionData));
     super::free();
 }
 
@@ -203,6 +218,8 @@
 {
     return capacityIncrement = increment; 
 }
+
+// xx-review: does not check for capacity == EXTERNAL
 
 unsigned int OSData::ensureCapacity(unsigned int newCapacity)
 {
@@ -220,7 +237,7 @@
         bzero(newData + capacity, newCapacity - capacity);
         if (data) {
             bcopy(data, newData, capacity);
-            kfree((vm_offset_t)data, capacity);
+            kfree(data, capacity);
         }
         ACCUMSIZE( newCapacity - capacity );
         data = (void *) newData;
@@ -318,11 +335,11 @@
 
 bool OSData::isEqualTo(const OSMetaClassBase *obj) const
 {
-    OSData *	data;
+    OSData *	otherData;
     OSString *  str;
 
-    if ((data = OSDynamicCast(OSData, obj)))
-        return isEqualTo(data);
+    if ((otherData = OSDynamicCast(OSData, obj)))
+        return isEqualTo(otherData);
     else if ((str = OSDynamicCast (OSString, obj)))
         return isEqualTo(str);
     else
@@ -378,12 +395,16 @@
     unsigned int i;
     const unsigned char *p;
     unsigned char c;
+    unsigned int serializeLength;
 
     if (s->previouslySerialized(this)) return true;
 
     if (!s->addXMLStartTag(this, "data")) return false;
 
-    for (i = 0, p = (unsigned char *)data; i < length; i++, p++) {
+    serializeLength = length;
+    if (reserved && reserved->disableSerialization) serializeLength = 0;
+
+    for (i = 0, p = (unsigned char *)data; i < serializeLength; i++, p++) {
         /* 3 bytes are encoded as 4 */
         switch (i % 3) {
 	case 0:
@@ -420,3 +441,25 @@
 
     return s->addXMLEndTag("data");
 }
+
+void OSData::setDeallocFunction(DeallocFunction func)
+{
+    if (!reserved)
+    {
+    	reserved = (typeof(reserved)) kalloc(sizeof(ExpansionData));
+	if (!reserved) return;
+	bzero(reserved, sizeof(ExpansionData));
+    }
+    reserved->deallocFunction = func;
+}
+
+void OSData::setSerializable(bool serializable)
+{
+    if (!reserved)
+    {
+    	reserved = (typeof(reserved)) kalloc(sizeof(ExpansionData));
+	if (!reserved) return;
+	bzero(reserved, sizeof(ExpansionData));
+    }
+    reserved->disableSerialization = (!serializable);
+}