embedding/browser/webBrowser/nsEmbedStream.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   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
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  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  * Christopher Blizzard.
  19  * Portions created by the Initial Developer are Copyright (C) 2001
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   Christopher Blizzard <blizzard@mozilla.org>
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either the GNU General Public License Version 2 or later (the "GPL"), or
  27  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28  * in which case the provisions of the GPL or the LGPL are applicable instead
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsIAsyncInputStream.h"
  40 #include "nsIDocShell.h"
  41 #include "nsIInterfaceRequestorUtils.h"
  42 #include "nsIPipe.h"
  43
  44 #include "nsEmbedStream.h"
  45 #include "nsNetError.h"
  46 #include "nsString.h"
  47
  48 NS_IMPL_ISUPPORTS0(nsEmbedStream)
  49
  50 nsEmbedStream::nsEmbedStream()
  51 {
  52   mOwner = nsnull;
  53 }
  54
  55 nsEmbedStream::~nsEmbedStream()
  56 {
  57 }
  58
  59 void
  60 nsEmbedStream::InitOwner(nsIWebBrowser *aOwner)
  61 {
  62   mOwner = aOwner;
  63 }
  64
  65 NS_METHOD
  66 nsEmbedStream::Init(void)
  67 {
  68   return NS_OK;
  69 }
  70
  71 NS_METHOD
  72 nsEmbedStream::OpenStream(nsIURI *aBaseURI, const nsACString& aContentType)
  73 {
  74   nsresult rv;
  75   NS_ENSURE_ARG_POINTER(aBaseURI);
  76   NS_ENSURE_TRUE(IsASCII(aContentType), NS_ERROR_INVALID_ARG);
  77
  78   // if we're already doing a stream, return an error
  79   if (mOutputStream)
  80     return NS_ERROR_IN_PROGRESS;
  81
  82   nsCOMPtr<nsIAsyncInputStream> inputStream;
  83   nsCOMPtr<nsIAsyncOutputStream> outputStream;
  84   rv = NS_NewPipe2(getter_AddRefs(inputStream),
  85                    getter_AddRefs(outputStream),
  86                    PR_TRUE, PR_FALSE, 0, PR_UINT32_MAX);
  87   if (NS_FAILED(rv))
  88     return rv;
  89
  90   nsCOMPtr<nsIDocShell> docShell = do_GetInterface(mOwner);
  91   rv = docShell->LoadStream(inputStream, aBaseURI, aContentType,
  92                             EmptyCString(), nsnull);
  93   if (NS_FAILED(rv))
  94     return rv;
  95
  96   mOutputStream = outputStream;
  97   return rv;
  98 }
  99
 100 NS_METHOD
 101 nsEmbedStream::AppendToStream(const PRUint8 *aData, PRUint32 aLen)
 102 {
 103   nsresult rv;
 104   NS_ENSURE_STATE(mOutputStream);
 105
 106   PRUint32 bytesWritten = 0;
 107   rv = mOutputStream->Write(reinterpret_cast<const char*>(aData),
 108                             aLen, &bytesWritten);
 109   if (NS_FAILED(rv))
 110     return rv;
 111
 112   NS_ASSERTION(bytesWritten == aLen,
 113                "underlying buffer couldn't handle the write");
 114   return rv;
 115 }
 116
 117 NS_METHOD
 118 nsEmbedStream::CloseStream(void)
 119 {
 120   nsresult rv = NS_OK;
 121
 122   // NS_ENSURE_STATE returns NS_ERROR_UNEXPECTED if the condition isn't
 123   // satisfied; this is exactly what we want to return.
 124   NS_ENSURE_STATE(mOutputStream);
 125   mOutputStream->Close();
 126   mOutputStream = 0;
 127
 128   return rv;
 129 }