gecko-dev/modules/libjar/nsJARInputStream.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* nsJARInputStream.cpp
 * 
 * ***** 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 Netscape Communicator source code. 
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Mitch Stoltz <mstoltz@netscape.com>
 *
 * 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 "nsJARInputStream.h"
#include "zipfile.h"           // defines ZIP error codes
#include "nsZipArchive.h"


/*---------------------------------------------
 *  nsISupports implementation
 *--------------------------------------------*/

NS_IMPL_THREADSAFE_ISUPPORTS1(nsJARInputStream, nsIInputStream)

/*----------------------------------------------------------
 * nsJARInputStream implementation
 *--------------------------------------------------------*/

NS_IMETHODIMP 
nsJARInputStream::Available(PRUint32 *_retval)
{
    if (!mJAR)
        return NS_BASE_STREAM_CLOSED;

    *_retval = mReadInfo.Available();
    return NS_OK;
}

NS_IMETHODIMP
nsJARInputStream::Read(char* buf, PRUint32 count, PRUint32 *bytesRead)
{
    if (!mJAR) {
        *bytesRead = 0;
        return NS_OK;
    }
    
    PRInt32 err = mReadInfo.Read(buf, count, bytesRead);
    return err == ZIP_OK ? NS_OK : NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsJARInputStream::ReadSegments(nsWriteSegmentFun writer, void * closure, PRUint32 count, PRUint32 *_retval)
{
    // don't have a buffer to read from, so this better not be called!
    NS_NOTREACHED("Consumers should be using Read()!");
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsJARInputStream::IsNonBlocking(PRBool *aNonBlocking)
{
    *aNonBlocking = PR_FALSE;
    return NS_OK;
}

NS_IMETHODIMP
nsJARInputStream::Close()
{
    mJAR = nsnull;
    return NS_OK;
}

nsresult 
nsJARInputStream::Init(nsJAR* aJAR, const char* aFilename)
{
  NS_ENSURE_ARG_POINTER(aJAR);
  NS_ENSURE_ARG_POINTER(aFilename);

  mJAR = aJAR;

  // Don't assert if !fd, because it's possible that aJAR comes
  // from a cache and aJAR's file has been deled
  PRFileDesc* fd = aJAR->OpenFile();
  if (!fd)
      return NS_ERROR_UNEXPECTED;

  // mReadInfo takes ownership of fd here
  PRInt32 result = aJAR->mZip.ReadInit(aFilename, &mReadInfo, fd);
  if (result != ZIP_OK)
    return NS_ERROR_FAILURE;
  return NS_OK;
}

//----------------------------------------------
// nsJARInputStream constructor and destructor
//----------------------------------------------

nsJARInputStream::nsJARInputStream()
{
}

nsJARInputStream::~nsJARInputStream()
{
  Close();
}