gecko/js/xpconnect/loader/mozJSLoaderUtils.cpp
2012-03-24 12:33:30 +01:00

89 lines
3.3 KiB
C++

/* ***** 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 mozilla.org
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010-2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Michael Wu <mwu@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 "nsAutoPtr.h"
#include "nsScriptLoader.h"
#include "jsapi.h"
#include "jsdbgapi.h"
#include "nsJSPrincipals.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/scache/StartupCacheUtils.h"
using namespace mozilla::scache;
// We only serialize scripts with system principals. So we don't serialize the
// principals when writing a script. Instead, when reading it back, we set the
// principals to the system principals.
nsresult
ReadCachedScript(StartupCache* cache, nsACString &uri, JSContext *cx,
nsIPrincipal *systemPrincipal, JSScript **scriptp)
{
nsAutoArrayPtr<char> buf;
PRUint32 len;
nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).get(),
getter_Transfers(buf), &len);
if (NS_FAILED(rv))
return rv; // don't warn since NOT_AVAILABLE is an ok error
JSScript *script = JS_DecodeScript(cx, buf, len, nsJSPrincipals::get(systemPrincipal), nsnull);
if (!script)
return NS_ERROR_OUT_OF_MEMORY;
*scriptp = script;
return NS_OK;
}
nsresult
WriteCachedScript(StartupCache* cache, nsACString &uri, JSContext *cx,
nsIPrincipal *systemPrincipal, JSScript *script)
{
MOZ_ASSERT(JS_GetScriptPrincipals(script) == nsJSPrincipals::get(systemPrincipal));
MOZ_ASSERT(JS_GetScriptOriginPrincipals(script) == nsJSPrincipals::get(systemPrincipal));
uint32_t size;
void *data = JS_EncodeScript(cx, script, &size);
if (!data)
return NS_ERROR_OUT_OF_MEMORY;
MOZ_ASSERT(size);
nsresult rv = cache->PutBuffer(PromiseFlatCString(uri).get(), static_cast<char *>(data), size);
js_free(data);
return rv;
}