Refactor List.setRange function.

sdk/lib/io/file_impl.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 // Read the file in blocks of size 64k.
 const int _BLOCK_SIZE = 64 * 1024;
 
 
@@ skipping 722 matching lines @@
     request[0] = _READ_LIST_REQUEST;
     request[1] = _id;
     request[2] = bytes;
     return _fileService.call(request).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(response,
                                      "readList failed for file '$_path'");
       }
       var read = response[1];
       var data = response[2];
-      buffer.setRange(offset, read, data);
+      buffer.setRange(offset, offset + read, data);
       return read;
     });
   }
 
   static void _checkReadWriteListArguments(int length, int offset, int bytes) {
     if (offset < 0) throw new RangeError.value(offset);
     if (bytes < 0) throw new RangeError.value(bytes);
     if ((offset + bytes) > length) {
       throw new RangeError.value(offset + bytes);
     }
@@ skipping 300 matching lines @@
           new FileIOException("File closed '$_path'"));
     });
     return completer.future;
   }
 
   final String _path;
   int _id;
 
   SendPort _fileService;
 }