pjs/modules/libjar/nsJARInputStream.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* nsJARInputStream.cpp
 * 
 * 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 Netscape are
 * Copyright (C) 1999 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s): 
 * Mitch Stoltz <mstoltz@netscape.com>
 */

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

NS_IMETHODIMP
nsJARInputStream::Read(char* buf, PRUint32 count, PRUint32 *bytesRead)
{
    if (!mJAR)
        return NS_BASE_STREAM_CLOSED;
    
    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()
{
    NS_IF_RELEASE(mJAR);
    return NS_OK;
}

nsresult 
nsJARInputStream::Init(nsJAR* aJAR, const char* aFilename)
{
  if (!aFilename)
    return NS_ERROR_NULL_POINTER;
  mJAR = aJAR;
  NS_ADDREF(mJAR);

  PRInt32 result;
  PRFileDesc* fd = aJAR->OpenFile();
  NS_ASSERTION(fd, "Couldn't open JAR!");

  if (!fd)
      return NS_ERROR_UNEXPECTED;
  
  result = aJAR->mZip.ReadInit(aFilename, &mReadInfo, fd);
  if (result != ZIP_OK)
    return NS_ERROR_FAILURE;
  return NS_OK;
}

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

nsJARInputStream::nsJARInputStream()
    : mJAR(nsnull)
{
}

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