Parts of bug 205425 - turn the embedding widget into a GRE client - patch by marco@gnome.org r=me sr=blizzard

git-svn-id: svn://10.0.0.236/trunk@157100 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/embedding/browser/webBrowser/nsEmbedStream.cpp

@@ -0,0 +1,290 @@
+/*
+ * 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.
+ * 
+ * Contributor(s):
+ *   Christopher Blizzard <blizzard@mozilla.org>
+ */
+
+#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(const char *aBaseURI, const char *aContentType)
+{
+  NS_ENSURE_ARG_POINTER(aBaseURI);
+  NS_ENSURE_ARG_POINTER(aContentType);
+
+  nsresult rv = NS_OK;
+
+  // if we're already doing a stream then close the current one
+  if (mDoingStream)
+    CloseStream();
+
+  // set our state
+  mDoingStream = PR_TRUE;
+
+  // initialize our streams
+  rv = Init();
+  if (NS_FAILED(rv))
+    return rv;
+
+  // get the viewer container
+  nsCOMPtr<nsIContentViewerContainer> viewerContainer;
+  viewerContainer = do_GetInterface(mOwner);
+
+  // create a new uri object
+  nsCOMPtr<nsIURI> uri;
+  nsCAutoString spec(aBaseURI);
+  rv = NS_NewURI(getter_AddRefs(uri), spec.get());
+  
+  if (NS_FAILED(rv))
+    return rv;
+
+  // 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), uri,
+				NS_STATIC_CAST(nsIInputStream *, this),
+				nsDependentCString(aContentType),
+				EmptyCString());
+  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
+
+  nsXPIDLCString docLoaderContractID;
+  nsCOMPtr<nsICategoryManager> catMan(do_GetService(NS_CATEGORYMANAGER_CONTRACTID, &rv));
+  if (NS_FAILED(rv))
+    return rv;
+  rv = catMan->GetCategoryEntry("Gecko-Content-Viewers", aContentType,
+                                getter_Copies(docLoaderContractID));
+  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,
+					aContentType, 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
+  nsCOMPtr<nsIRequest> request = do_QueryInterface(mChannel); 
+  rv = mStreamListener->OnStartRequest(request, NULL);
+  if (NS_FAILED(rv))
+    return rv;
+  
+  return NS_OK;
+}
+
+NS_METHOD
+nsEmbedStream::AppendToStream(const char *aData, PRInt32 aLen)
+{
+  nsresult rv;
+
+  // append the data
+  rv = Append(aData, aLen);
+  if (NS_FAILED(rv))
+    return rv;
+
+  // notify our listeners
+  nsCOMPtr<nsIRequest> request = do_QueryInterface(mChannel); 
+  rv = mStreamListener->OnDataAvailable(request,
+					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(mDoingStream);
+  mDoingStream = PR_FALSE;
+
+  nsCOMPtr<nsIRequest> request = do_QueryInterface(mChannel, &rv); 
+  if (NS_FAILED(rv))
+    goto loser;
+  
+  rv = mStreamListener->OnStopRequest(request, NULL, NS_OK);
+  if (NS_FAILED(rv))
+    return rv;
+
+ loser:
+  mLoadGroup = nsnull;
+  mChannel = nsnull;
+  mStreamListener = nsnull;
+  mOffset = 0;
+
+  return rv;
+}
+
+NS_METHOD
+nsEmbedStream::Append(const char *aData, PRUint32 aLen)
+{
+  nsresult rv = NS_OK;
+  PRUint32 bytesWritten = 0;
+  rv = mOutputStream->Write(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)
+{
+  char *readBuf = (char *)malloc(aCount);
+  PRUint32 nBytes;
+
+  if (!readBuf)
+    return NS_ERROR_OUT_OF_MEMORY;
+  
+  nsresult rv = mInputStream->Read(readBuf, aCount, &nBytes);
+
+  *_retval = 0;
+
+  if (NS_SUCCEEDED(rv)) {
+    PRUint32 writeCount = 0;
+    rv = aWriter(this, aClosure, readBuf, 0, nBytes, &writeCount);
+
+    // XXX writeCount may be less than nBytes!!  This is the wrong
+    // way to synthesize ReadSegments.
+    NS_ASSERTION(writeCount == nBytes, "data loss");
+
+    // errors returned from the writer end here!
+    rv = NS_OK;
+  }
+
+  free(readBuf);
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsEmbedStream::IsNonBlocking(PRBool *aNonBlocking)
+{
+    return mInputStream->IsNonBlocking(aNonBlocking);
+}