/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Darin Fisher <darin@netscape.com> (original author)
 *
 * 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 NPL, 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 NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsSimpleStreamProvider.h"
#include "nsIOutputStream.h"

//
//----------------------------------------------------------------------------
// nsISupports implementation...
//----------------------------------------------------------------------------
//
NS_IMPL_THREADSAFE_ISUPPORTS3(nsSimpleStreamProvider,
                              nsISimpleStreamProvider,
                              nsIStreamProvider,
                              nsIRequestObserver)

//
//----------------------------------------------------------------------------
// nsIRequestObserver implementation...
//----------------------------------------------------------------------------
//
NS_IMETHODIMP
nsSimpleStreamProvider::OnStartRequest(nsIRequest *request,
                                       nsISupports *aContext)
{
    return mObserver ?
        mObserver->OnStartRequest(request, aContext) : NS_OK;
}

NS_IMETHODIMP
nsSimpleStreamProvider::OnStopRequest(nsIRequest* request,
                                      nsISupports *aContext,
                                      nsresult aStatus)
{
    return mObserver ?
        mObserver->OnStopRequest(request, aContext, aStatus) : NS_OK;
}

//
//----------------------------------------------------------------------------
// nsIStreamProvider implementation...
//----------------------------------------------------------------------------
//
NS_IMETHODIMP
nsSimpleStreamProvider::OnDataWritable(nsIRequest *request,
                                       nsISupports *aContext,
                                       nsIOutputStream *aOutput,
                                       PRUint32 aOffset,
                                       PRUint32 aCount)
{
    PRUint32 writeCount;
    nsresult rv = aOutput->WriteFrom(mSource, aCount, &writeCount);
    //
    // Equate zero bytes written and NS_SUCCEEDED to EOF
    //
    if (NS_SUCCEEDED(rv) && (writeCount == 0))
        return NS_BASE_STREAM_CLOSED;
    return rv;
}

//
//----------------------------------------------------------------------------
// nsISimpleStreamProvider implementation...
//----------------------------------------------------------------------------
//
NS_IMETHODIMP
nsSimpleStreamProvider::Init(nsIInputStream *aSource,
                             nsIRequestObserver *aObserver)
{
    NS_PRECONDITION(aSource, "null input stream");

    mSource = aSource;
    mObserver = aObserver;

    return NS_OK;
}