diff --git a/Source/NSData.m b/Source/NSData.m
new file mode 100644
index 000000000..48ad54ac9
--- /dev/null
+++ b/Source/NSData.m
@@ -0,0 +1,224 @@
+/* Stream of bytes class for serialization and persistance in GNUStep
+   Copyright (C) 1995 Free Software Foundation, Inc.
+   
+   Written by:  R. Andrew McCallum <mccallum@gnu.ai.mit.edu>
+   Date: March 1995
+   
+   This file is part of the GNU Objective C Class Library.
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+   */
+
+#include <objects/stdobjects.h>
+#include <foundation/NSData.h>
+#include <foundation/NSString.h>
+
+@class NSGNUData;		/* xxx Needs to be #included. */
+
+@implementation NSData
+
+// Allocating and Initializing a Data Object
+
++ (id) data
+{
+  return [[[NSGNUData alloc] init] 
+	  autorelease];
+}
+
++ (id) dataWithBytes: (const void*)bytes
+   length: (unsigned int)length
+{
+  return [[[NSGNUData alloc] initWithBytes:bytes length:length] 
+	  autorelease];
+}
+
++ (id) dataWithBytesNoCopy: (void*)bytes
+   length: (unsigned int)length
+{
+  return [[[self alloc] initWithBytesNoCopy:bytes length:length]
+	  autorelease];
+}
+
++ (id)dataWithContentsOfFile: (NSString*)path
+{
+  return [self notImplemented:_cmd];
+}
+
++ (id) dataWithContentsOfMappedFile: (NSString*)path
+{
+  return [self notImplemented:_cmd];
+}
+
+- (id) initWithBytes: (const void*)bytes
+   length: (unsigned int)length
+{
+  /* xxx Eventually we'll have to be aware of malloc'ed memory
+     vs vm_allocate'd memory, etc. */
+  void *buf = NSZoneMalloc([self zone], length);
+  memcpy(buf, bytes, length);
+  return [self initWithBytesNoCopy:buf length:length];
+}
+
+/* This is one of the designated initializer for NSData */
+- (id) initWithBytesNoCopy: (void*)bytes
+   length: (unsigned int)length
+{
+  /* xxx Eventually we'll have to be aware of malloc'ed memory
+     vs vm_allocate'd memory, etc. */
+  [self notImplemented:_cmd];
+  return nil;
+}
+
+- (id) initWithContentsOfFile: (NSString*)path
+{
+  return [self notImplemented:_cmd];
+}
+
+- (id) initWithContentsOfMappedFile: (NSString*)path;
+{
+  return [self notImplemented:_cmd];
+}
+
+- (id) initWithData: (NSData*)data
+{
+  return [self initWithBytes:[data bytes] length:[data length]];
+}
+
+
+// Accessing Data 
+
+- (const void*) bytes
+{
+  [self notImplemented:_cmd];
+  return NULL;
+}
+
+- (NSString*) description
+{
+  /* xxx worry about escaping, NSString does that? */
+  return [NSString stringWithBytes:[self bytes] length:[self length]];
+}
+
+- (void)getBytes: (void*)buffer
+{
+  [self getBytes:buffer length:[self length]];
+}
+
+- (void)getBytes: (void*)buffer
+   length: (unsigned int)length
+{
+  [self getBytes:buffer range:((NSRange){0, length})];
+}
+
+- (void)getBytes: (void*)buffer
+   range: (NSRange)aRange
+{
+  [self notImplemented:_cmd];
+}
+
+- (NSData*) subdataWithRange: (NSRange)aRange
+{
+  [self notImplemented:_cmd];
+  return nil;
+}
+
+
+// Querying a Data Object
+- (BOOL) isEqualToData: (NSData*)other;
+{
+  int len;
+  if ((len = [self length]) != [other length])
+    return NO;
+  return (memcmp([self bytes], [other bytes], len) ? NO : YES);
+}
+
+- (unsigned int)length;
+{
+  [self notImplemented:_cmd];
+  return 0;
+}
+
+
+// Storing Data
+
+- (BOOL) writeToFile: (NSString*)path
+   atomically: (BOOL)useAuxiliaryFile
+{
+  [self notImplemented:_cmd];
+  return NO;
+}
+
+
+// Deserializing Data
+
+- (unsigned int) deserializeAlignedBytesLengthAtCursor: (unsigned int*)cursor
+{
+  [self notImplemented:_cmd];
+  return 0;
+}
+
+- (void)deserializeBytes: (void*)buffer
+   length: (unsigned int)bytes
+   atCursor: (unsigned int*)cursor
+{
+  [self notImplemented:_cmd];
+}
+
+- (void)deserializeDataAt: (void*)data
+   ofObjCType: (const char*)type
+   atCursor: (unsigned int*)cursor
+   context: (id <NSObjCTypeSerializationCallBack>)callback
+{
+  return;
+}
+
+
+- (int) deserializeIntAtCursor: (unsigned int*)cursor
+{
+  [self notImplemented:_cmd];
+  return 0;
+}
+
+- (int) deserializeIntAtLocation: (unsigned int)location
+{
+  [self notImplemented:_cmd];
+  return 0;
+}
+
+- (void)deserializeInts: (int*)intBuffer
+   count: (unsigned int)numInts
+   atCursor: (unsigned int*)cursor
+{
+  [self notImplemented:_cmd];
+}
+
+- (void)deserializeInts: (int*)intBuffer
+{
+  [self notImplemented:_cmd];
+}
+
+- (id) copyWithZone: (NSZone*)zone
+{
+  [self notImplemented:_cmd];
+  return nil;
+}
+
+- (id) mutableCopyWithZone: (NSZone*)zone
+{
+  [self notImplemented:_cmd];
+  return nil;
+}
+
+@end