netwerk/base/src/nsSerializationHelper.cpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is mozilla.org networking code.
  15  *
  16  * The Initial Developer of the Original Code is
  17  * Google Inc.
  18  * Portions created by the Initial Developer are Copyright (C) 2007
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   Christian Biesinger <cbiesinger@web.de> (Initial author)
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27  * in which case the provisions of the GPL or the LGPL are applicable instead
  28  * of those above. If you wish to allow use of your version of this file only
  29  * under the terms of either the GPL or the LGPL, and not to allow others to
  30  * use your version of this file under the terms of the MPL, indicate your
  31  * decision by deleting the provisions above and replace them with the notice
  32  * and other provisions required by the GPL or the LGPL. If you do not delete
  33  * the provisions above, a recipient may use your version of this file under
  34  * the terms of any one of the MPL, the GPL or the LGPL.
  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "nsSerializationHelper.h"
  39
  40 #include "plbase64.h"
  41 #include "prmem.h"
  42
  43 #include "nsISerializable.h"
  44 #include "nsIObjectOutputStream.h"
  45 #include "nsIObjectInputStream.h"
  46 #include "nsString.h"
  47 #include "nsBase64Encoder.h"
  48 #include "nsAutoPtr.h"
  49 #include "nsComponentManagerUtils.h"
  50 #include "nsStringStream.h"
  51
  52 nsresult
  53 NS_SerializeToString(nsISerializable* obj, nsCSubstring& str)
  54 {
  55   nsRefPtr<nsBase64Encoder> stream(new nsBase64Encoder());
  56   if (!stream)
  57     return NS_ERROR_OUT_OF_MEMORY;
  58
  59   nsCOMPtr<nsIObjectOutputStream> objstream =
  60       do_CreateInstance("@mozilla.org/binaryoutputstream;1");
  61   if (!objstream)
  62     return NS_ERROR_OUT_OF_MEMORY;
  63
  64   objstream->SetOutputStream(stream);
  65   nsresult rv =
  66       objstream->WriteCompoundObject(obj, NS_GET_IID(nsISupports), PR_TRUE);
  67   NS_ENSURE_SUCCESS(rv, rv);
  68   return stream->Finish(str);
  69 }
  70
  71 nsresult
  72 NS_DeserializeObject(const nsCSubstring& str, nsISupports** obj)
  73 {
  74   // Base64 maps 3 binary bytes -> 4 ASCII bytes, so this calculation gives us
  75   // the right size. Compare also the comment in plbase64.h.
  76   PRUint32 size = (str.Length() * 3) / 4;
  77   char* buf = PL_Base64Decode(str.BeginReading(), str.Length(), nsnull);
  78   if (!buf)
  79     return NS_ERROR_OUT_OF_MEMORY;
  80   nsCOMPtr<nsIInputStream> stream;
  81   nsresult rv = NS_NewCStringInputStream(getter_AddRefs(stream),
  82                                          Substring(buf, buf + size));
  83   PR_Free(buf);
  84   NS_ENSURE_SUCCESS(rv, rv);
  85
  86   nsCOMPtr<nsIObjectInputStream> objstream =
  87       do_CreateInstance("@mozilla.org/binaryinputstream;1");
  88   if (!objstream)
  89     return NS_ERROR_OUT_OF_MEMORY;
  90
  91   objstream->SetInputStream(stream);
  92   return objstream->ReadObject(PR_TRUE, obj);
  93 }