gecko-dev/startupcache/nsStartupCacheUtils.cpp

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4.2 KiB
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* ***** 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 Startup Cache.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation <http://www.mozilla.org/>.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Benedict Hsieh <bhsieh@mozilla.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 "nsStartupCacheUtils.h"
#include "nsCOMPtr.h"
#include "nsComponentManagerUtils.h"
#include "nsIInputStream.h"
#include "nsIStorageStream.h"
#include "nsIStringStream.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
nsresult
NS_NewObjectInputStreamFromBuffer(char* buffer, int len,
nsIObjectInputStream** stream)
{
nsCOMPtr<nsIStringInputStream> stringStream
= do_CreateInstance("@mozilla.org/io/string-input-stream;1");
if (!stringStream)
return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIObjectInputStream> objectInput
= do_CreateInstance("@mozilla.org/binaryinputstream;1");
if (!objectInput)
return NS_ERROR_OUT_OF_MEMORY;
stringStream->AdoptData(buffer, len);
objectInput->SetInputStream(stringStream);
NS_ADDREF(*stream = objectInput);
return NS_OK;
}
// This is questionable API name and design, but we can't
// retrieve the wrapped stream from the objectOutputStream later...
nsresult
NS_NewObjectOutputWrappedStorageStream(nsIObjectOutputStream **wrapperStream,
nsIStorageStream** stream)
{
nsCOMPtr<nsIStorageStream> storageStream;
nsresult rv = NS_NewStorageStream(256, (PRUint32)-1,
getter_AddRefs(storageStream));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIObjectOutputStream> objectOutput
= do_CreateInstance("@mozilla.org/binaryoutputstream;1");
if (!objectOutput)
return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIOutputStream> outputStream
= do_QueryInterface(storageStream);
objectOutput->SetOutputStream(outputStream);
NS_ADDREF(*wrapperStream = objectOutput);
NS_ADDREF(*stream = storageStream);
return NS_OK;
}
nsresult
NS_NewBufferFromStorageStream(nsIStorageStream *storageStream,
char** buffer, int* len)
{
nsresult rv;
nsCOMPtr<nsIInputStream> inputStream;
rv = storageStream->NewInputStream(0, getter_AddRefs(inputStream));
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 avail, read;
rv = inputStream->Available(&avail);
NS_ENSURE_SUCCESS(rv, rv);
char* temp = new char[avail];
if (!temp)
return NS_ERROR_OUT_OF_MEMORY;
rv = inputStream->Read(temp, avail, &read);
if (NS_SUCCEEDED(rv) && avail != read)
rv = NS_ERROR_UNEXPECTED;
if (NS_FAILED(rv)) {
delete temp;
return rv;
}
*len = avail;
*buffer = temp;
return NS_OK;
}