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 4 : NS_SerializeToString(nsISerializable* obj, nsCSubstring& str)
54 : {
55 8 : nsRefPtr<nsBase64Encoder> stream(new nsBase64Encoder());
56 4 : if (!stream)
57 0 : return NS_ERROR_OUT_OF_MEMORY;
58 :
59 : nsCOMPtr<nsIObjectOutputStream> objstream =
60 8 : do_CreateInstance("@mozilla.org/binaryoutputstream;1");
61 4 : if (!objstream)
62 0 : return NS_ERROR_OUT_OF_MEMORY;
63 :
64 4 : objstream->SetOutputStream(stream);
65 : nsresult rv =
66 4 : objstream->WriteCompoundObject(obj, NS_GET_IID(nsISupports), true);
67 4 : NS_ENSURE_SUCCESS(rv, rv);
68 4 : return stream->Finish(str);
69 : }
70 :
71 : nsresult
72 0 : NS_DeserializeObject(const nsCSubstring& str, nsISupports** obj)
73 : {
74 : // Base64 maps 3 binary bytes -> 4 ASCII bytes. If the original byte array
75 : // does not have length 0 mod 3, the input is padded with zeros and the
76 : // output is padded with a corresponding number of trailing '=' (which are
77 : // then sometimes dropped). To compute the correct length of the original
78 : // byte array, we have to subtract the number of trailing '=' and then
79 : // multiply by 3 and then divide by 4 (making sure this is an integer
80 : // division).
81 :
82 0 : PRUint32 size = str.Length();
83 0 : if (size > 0 && str[size-1] == '=') {
84 0 : if (size > 1 && str[size-2] == '=') {
85 0 : size -= 2;
86 : } else {
87 0 : size -= 1;
88 : }
89 : }
90 0 : size = (size * 3) / 4;
91 0 : char* buf = PL_Base64Decode(str.BeginReading(), str.Length(), nsnull);
92 0 : if (!buf)
93 0 : return NS_ERROR_OUT_OF_MEMORY;
94 0 : nsCOMPtr<nsIInputStream> stream;
95 0 : nsresult rv = NS_NewCStringInputStream(getter_AddRefs(stream),
96 0 : Substring(buf, size));
97 0 : PR_Free(buf);
98 0 : NS_ENSURE_SUCCESS(rv, rv);
99 :
100 : nsCOMPtr<nsIObjectInputStream> objstream =
101 0 : do_CreateInstance("@mozilla.org/binaryinputstream;1");
102 0 : if (!objstream)
103 0 : return NS_ERROR_OUT_OF_MEMORY;
104 :
105 0 : objstream->SetInputStream(stream);
106 0 : return objstream->ReadObject(true, obj);
107 : }
108 :
109 0 : NS_IMPL_ISUPPORTS1(nsSerializationHelper, nsISerializationHelper)
110 :
111 : NS_IMETHODIMP
112 0 : nsSerializationHelper::SerializeToString(nsISerializable *serializable,
113 : nsACString & _retval NS_OUTPARAM)
114 : {
115 0 : return NS_SerializeToString(serializable, _retval);
116 : }
117 :
118 : NS_IMETHODIMP
119 0 : nsSerializationHelper::DeserializeObject(const nsACString & input,
120 : nsISupports **_retval NS_OUTPARAM)
121 : {
122 0 : return NS_DeserializeObject(input, _retval);
123 : }
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