gecko-dev/embedding/browser/webBrowser/nsEmbedStream.cpp

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Christopher Blizzard. Portions created by Christopher Blizzard are Copyright (C) Christopher Blizzard. All Rights Reserved.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Christopher Blizzard <blizzard@mozilla.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <nsIPipe.h>
#include <nsIInputStream.h>
#include <nsIOutputStream.h>
#include <nsIContentViewerContainer.h>
#include <nsIDocumentLoaderFactory.h>
#include <nsNetUtil.h>
#include <prmem.h>
#include "nsXPCOMCID.h"
#include "nsICategoryManager.h"
#include "nsIContentViewer.h"
#include "nsEmbedStream.h"
#include "nsReadableUtils.h"
// nsIInputStream interface
NS_IMPL_ISUPPORTS1(nsEmbedStream, nsIInputStream)
nsEmbedStream::nsEmbedStream()
{
mOwner = nsnull;
mOffset = 0;
mDoingStream = PR_FALSE;
}
nsEmbedStream::~nsEmbedStream()
{
}
void
nsEmbedStream::InitOwner(nsIWebBrowser *aOwner)
{
mOwner = aOwner;
}
NS_METHOD
nsEmbedStream::Init(void)
{
nsresult rv = NS_OK;
nsCOMPtr<nsIInputStream> bufInStream;
nsCOMPtr<nsIOutputStream> bufOutStream;
rv = NS_NewPipe(getter_AddRefs(bufInStream),
getter_AddRefs(bufOutStream));
if (NS_FAILED(rv)) return rv;
mInputStream = bufInStream;
mOutputStream = bufOutStream;
return NS_OK;
}
NS_METHOD
nsEmbedStream::OpenStream(nsIURI *aBaseURI, const nsACString& aContentType)
{
NS_ENSURE_ARG_POINTER(aBaseURI);
NS_ENSURE_TRUE(IsASCII(aContentType), NS_ERROR_INVALID_ARG);
// if we're already doing a stream, return an error
if (mDoingStream)
return NS_ERROR_IN_PROGRESS;
// set our state
mDoingStream = PR_TRUE;
// initialize our streams
nsresult rv = Init();
if (NS_FAILED(rv))
return rv;
// get the viewer container
nsCOMPtr<nsIContentViewerContainer> viewerContainer;
viewerContainer = do_GetInterface(mOwner);
// create a new load group
rv = NS_NewLoadGroup(getter_AddRefs(mLoadGroup), nsnull);
if (NS_FAILED(rv))
return rv;
// create a new input stream channel
rv = NS_NewInputStreamChannel(getter_AddRefs(mChannel), aBaseURI,
NS_STATIC_CAST(nsIInputStream *, this),
aContentType);
if (NS_FAILED(rv))
return rv;
// set the channel's load group
rv = mChannel->SetLoadGroup(mLoadGroup);
if (NS_FAILED(rv))
return rv;
// find a document loader for this content type
const nsCString& flatContentType = PromiseFlatCString(aContentType);
nsXPIDLCString docLoaderContractID;
nsCOMPtr<nsICategoryManager> catMan(do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv));
if (NS_FAILED(rv))
return rv;
rv = catMan->GetCategoryEntry("Gecko-Content-Viewers",
flatContentType.get(),
getter_Copies(docLoaderContractID));
// Note: When the category manager does not find an entry for the requested
// contract ID, it will return NS_ERROR_NOT_AVAILABLE. This conveniently
// matches what this method wants to return in that case.
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsIDocumentLoaderFactory> docLoaderFactory;
docLoaderFactory = do_GetService(docLoaderContractID.get(), &rv);
if (NS_FAILED(rv))
return rv;
// ok, create an instance of the content viewer for that command and
// mime type
nsCOMPtr<nsIContentViewer> contentViewer;
rv = docLoaderFactory->CreateInstance("view", mChannel, mLoadGroup,
flatContentType.get(), viewerContainer,
nsnull,
getter_AddRefs(mStreamListener),
getter_AddRefs(contentViewer));
if (NS_FAILED(rv))
return rv;
// set the container viewer container for this content view
rv = contentViewer->SetContainer(viewerContainer);
if (NS_FAILED(rv))
return rv;
// embed this sucker
rv = viewerContainer->Embed(contentViewer, "view", nsnull);
if (NS_FAILED(rv))
return rv;
// start our request
rv = mStreamListener->OnStartRequest(mChannel, NULL);
if (NS_FAILED(rv))
return rv;
return NS_OK;
}
NS_METHOD
nsEmbedStream::AppendToStream(const PRUint8 *aData, PRUint32 aLen)
{
nsresult rv;
// append the data
rv = Append(aData, aLen);
if (NS_FAILED(rv))
return rv;
// notify our listeners
rv = mStreamListener->OnDataAvailable(mChannel,
NULL,
NS_STATIC_CAST(nsIInputStream *, this),
mOffset, /* offset */
aLen); /* len */
// move our counter
mOffset += aLen;
if (NS_FAILED(rv))
return rv;
return NS_OK;
}
NS_METHOD
nsEmbedStream::CloseStream(void)
{
nsresult rv = NS_OK;
// NS_ENSURE_STATE returns NS_ERROR_UNEXPECTED if the condition isn't
// satisfied; this is exactly what we want to return.
NS_ENSURE_STATE(mDoingStream);
mDoingStream = PR_FALSE;
rv = mStreamListener->OnStopRequest(mChannel, NULL, NS_OK);
if (NS_FAILED(rv))
return rv;
mLoadGroup = nsnull;
mChannel = nsnull;
mStreamListener = nsnull;
mOffset = 0;
return rv;
}
NS_METHOD
nsEmbedStream::Append(const PRUint8 *aData, PRUint32 aLen)
{
PRUint32 bytesWritten = 0;
nsresult rv = mOutputStream->Write(NS_REINTERPRET_CAST(const char*, aData),
aLen, &bytesWritten);
if (NS_FAILED(rv))
return rv;
NS_ASSERTION(bytesWritten == aLen,
"underlying byffer couldn't handle the write");
return rv;
}
NS_IMETHODIMP
nsEmbedStream::Available(PRUint32 *_retval)
{
return mInputStream->Available(_retval);
}
NS_IMETHODIMP
nsEmbedStream::Read(char * aBuf, PRUint32 aCount, PRUint32 *_retval)
{
return mInputStream->Read(aBuf, aCount, _retval);
}
NS_IMETHODIMP nsEmbedStream::Close(void)
{
return mInputStream->Close();
}
NS_IMETHODIMP
nsEmbedStream::ReadSegments(nsWriteSegmentFun aWriter, void * aClosure,
PRUint32 aCount, PRUint32 *_retval)
{
return mInputStream->ReadSegments(aWriter, aClosure, aCount, _retval);
}
NS_IMETHODIMP
nsEmbedStream::IsNonBlocking(PRBool *aNonBlocking)
{
return mInputStream->IsNonBlocking(aNonBlocking);
}