gecko/js/ctypes/Library.cpp

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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 js-ctypes.
*
* 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):
* Mark Finkle <mark.finkle@gmail.com>, <mfinkle@mozilla.com>
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* Fredrik Larsson <nossralf@gmail.com>
* Dan Witte <dwitte@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 ***** */
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#include "Library.h"
#include "Function.h"
#include "nsServiceManagerUtils.h"
#include "nsAutoPtr.h"
#include "nsILocalFile.h"
#include "prlink.h"
#include "jsapi.h"
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namespace mozilla {
namespace ctypes {
static inline nsresult
jsvalToUint16(JSContext* aContext, jsval aVal, PRUint16& aResult)
{
if (JSVAL_IS_INT(aVal)) {
PRUint32 i = JSVAL_TO_INT(aVal);
if (i <= PR_UINT16_MAX) {
aResult = i;
return NS_OK;
}
}
JS_ReportError(aContext, "Parameter must be a valid ABI constant");
return NS_ERROR_INVALID_ARG;
}
static inline nsresult
jsvalToCString(JSContext* aContext, jsval aVal, const char*& aResult)
{
if (JSVAL_IS_STRING(aVal)) {
aResult = JS_GetStringBytes(JSVAL_TO_STRING(aVal));
return NS_OK;
}
JS_ReportError(aContext, "Parameter must be a string");
return NS_ERROR_INVALID_ARG;
}
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NS_IMPL_ISUPPORTS1(Library, nsIForeignLibrary)
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Library::Library()
: mLibrary(nsnull)
{
}
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Library::~Library()
{
Close();
}
NS_IMETHODIMP
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Library::Open(nsILocalFile* aFile)
{
NS_ENSURE_ARG(aFile);
NS_ENSURE_TRUE(!mLibrary, NS_ERROR_ALREADY_INITIALIZED);
return aFile->Load(&mLibrary);
}
NS_IMETHODIMP
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Library::Close()
{
if (mLibrary) {
PR_UnloadLibrary(mLibrary);
mLibrary = nsnull;
}
return NS_OK;
}
NS_IMETHODIMP
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Library::Declare(nsISupports** aResult)
{
NS_ENSURE_ARG_POINTER(aResult);
NS_ENSURE_TRUE(mLibrary, NS_ERROR_NOT_INITIALIZED);
nsresult rv;
nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID());
nsAXPCNativeCallContext* ncc;
rv = xpc->GetCurrentNativeCallContext(&ncc);
NS_ENSURE_SUCCESS(rv, rv);
JSContext *ctx;
rv = ncc->GetJSContext(&ctx);
NS_ENSURE_SUCCESS(rv, rv);
JSAutoRequest ar(ctx);
PRUint32 argc;
jsval *argv;
ncc->GetArgc(&argc);
ncc->GetArgvPtr(&argv);
// we always need at least a method name, a call type and a return type
if (argc < 3) {
JS_ReportError(ctx, "Insufficient number of arguments");
return NS_ERROR_INVALID_ARG;
}
const char* name;
rv = jsvalToCString(ctx, argv[0], name);
NS_ENSURE_SUCCESS(rv, rv);
PRUint16 callType;
rv = jsvalToUint16(ctx, argv[1], callType);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoTArray<jsval, 16> argTypes;
for (PRUint32 i = 3; i < argc; ++i) {
argTypes.AppendElement(argv[i]);
}
PRFuncPtr func = PR_FindFunctionSymbol(mLibrary, name);
if (!func) {
JS_ReportError(ctx, "Couldn't find function symbol in library");
return NS_ERROR_FAILURE;
}
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nsRefPtr<Function> call = new Function;
rv = call->Init(ctx, this, func, callType, argv[2], argTypes);
NS_ENSURE_SUCCESS(rv, rv);
call.forget(aResult);
return rv;
}
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}
}