netwerk/protocol/data/src/nsDataChannel.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
   9  *
  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
  13  * License.
  14  *
  15  * The Original Code is mozilla.org code.
  16  *
  17  * The Initial Developer of the Original Code is
  18  * Netscape Communications Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  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 // data implementation
  39
  40 #include "nsDataChannel.h"
  41 #include "nsDataHandler.h"
  42 #include "nsNetUtil.h"
  43 #include "nsIPipe.h"
  44 #include "nsIInputStream.h"
  45 #include "nsIOutputStream.h"
  46 #include "nsReadableUtils.h"
  47 #include "nsNetSegmentUtils.h"
  48 #include "nsEscape.h"
  49 #include "plbase64.h"
  50 #include "plstr.h"
  51 #include "prmem.h"
  52
  53 nsresult
  54 nsDataChannel::OpenContentStream(PRBool async, nsIInputStream **result,
  55                                  nsIChannel** channel)
  56 {
  57     NS_ENSURE_TRUE(URI(), NS_ERROR_NOT_INITIALIZED);
  58
  59     nsresult rv;
  60
  61     nsCAutoString spec;
  62     rv = URI()->GetAsciiSpec(spec);
  63     if (NS_FAILED(rv)) return rv;
  64
  65     nsCString contentType, contentCharset, dataBuffer;
  66     PRBool lBase64;
  67     rv = nsDataHandler::ParseURI(spec, contentType, contentCharset,
  68                                  lBase64, dataBuffer);
  69
  70     NS_UnescapeURL(dataBuffer);
  71
  72     if (lBase64) {
  73         // Don't allow spaces in base64-encoded content. This is only
  74         // relevant for escaped spaces; other spaces are stripped in
  75         // NewURI.
  76         dataBuffer.StripWhitespace();
  77     }
  78
  79     nsCOMPtr<nsIInputStream> bufInStream;
  80     nsCOMPtr<nsIOutputStream> bufOutStream;
  81
  82     // create an unbounded pipe.
  83     rv = NS_NewPipe(getter_AddRefs(bufInStream),
  84                     getter_AddRefs(bufOutStream),
  85                     NET_DEFAULT_SEGMENT_SIZE, PR_UINT32_MAX,
  86                     async, PR_TRUE);
  87     if (NS_FAILED(rv))
  88         return rv;
  89
  90     PRUint32 contentLen;
  91     if (lBase64) {
  92         const PRUint32 dataLen = dataBuffer.Length();
  93         PRInt32 resultLen = 0;
  94         if (dataLen >= 1 && dataBuffer[dataLen-1] == '=') {
  95             if (dataLen >= 2 && dataBuffer[dataLen-2] == '=')
  96                 resultLen = dataLen-2;
  97             else
  98                 resultLen = dataLen-1;
  99         } else {
 100             resultLen = dataLen;
 101         }
 102         resultLen = ((resultLen * 3) / 4);
 103
 104         // XXX PL_Base64Decode will return a null pointer for decoding
 105         // errors.  Since those are more likely than out-of-memory,
 106         // should we return NS_ERROR_MALFORMED_URI instead?
 107         char * decodedData = PL_Base64Decode(dataBuffer.get(), dataLen, nsnull);
 108         if (!decodedData) {
 109             return NS_ERROR_OUT_OF_MEMORY;
 110         }
 111
 112         rv = bufOutStream->Write(decodedData, resultLen, &contentLen);
 113
 114         PR_Free(decodedData);
 115     } else {
 116         rv = bufOutStream->Write(dataBuffer.get(), dataBuffer.Length(), &contentLen);
 117     }
 118     if (NS_FAILED(rv))
 119         return rv;
 120
 121     SetContentType(contentType);
 122     SetContentCharset(contentCharset);
 123     SetContentLength64(contentLen);
 124
 125     NS_ADDREF(*result = bufInStream);
 126
 127     return NS_OK;
 128 }