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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#if defined(DYNAMIC_MODULES) //TODO: && defined(ELF loader target)
#include "backends/plugins/elf-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/fs.h"
#include "backends/plugins/elf-loader.h"
class ELFPlugin : public DynamicPlugin {
protected:
DLObject *_dlHandle;
Common::String _filename;
virtual VoidFunc findSymbol(const char *symbol) {
void *func;
bool handleNull;
if (_dlHandle == NULL) {
func = NULL;
handleNull = true;
} else {
func = _dlHandle->symbol(symbol);
}
if (!func) {
if (handleNull) {
warning("Failed loading symbol '%s' from plugin '%s' (Handle is NULL)", symbol, _filename.c_str());
} else {
warning("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
}
}
// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
// standard and POSIX: ISO C++ disallows casting between function pointers
// and data pointers, but dlsym always returns a void pointer. For details,
// see e.g. <http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
assert(sizeof(VoidFunc) == sizeof(func));
VoidFunc tmp;
memcpy(&tmp, &func, sizeof(VoidFunc));
return tmp;
}
public:
ELFPlugin(const Common::String &filename)
: _dlHandle(0), _filename(filename) {}
~ELFPlugin() {
if (_dlHandle)
unloadPlugin();
}
bool loadPlugin() {
assert(!_dlHandle);
DLObject *obj = new DLObject(NULL);
if (obj->open(_filename.c_str())) {
_dlHandle = obj;
} else {
delete obj;
_dlHandle = NULL;
}
if (!_dlHandle) {
warning("Failed loading plugin '%s'", _filename.c_str());
return false;
}
bool ret = DynamicPlugin::loadPlugin();
if (ret && _dlHandle) {
_dlHandle->discard_symtab();
}
return ret;
}
void unloadPlugin() {
DynamicPlugin::unloadPlugin();
if (_dlHandle) {
if (_dlHandle == NULL) {
// FIXME: This check makes no sense, _dlHandle cannot be NULL at this point
warning("Failed unloading plugin '%s' (Handle is NULL)", _filename.c_str());
} else if (_dlHandle->close()) {
delete _dlHandle;
} else {
warning("Failed unloading plugin '%s'", _filename.c_str());
// FIXME: We are leaking _dlHandle here!
// Any particular reasons why we would want to do that???
}
_dlHandle = 0;
}
}
};
Plugin* ELFPluginProvider::createPlugin(const Common::FSNode &node) const {
return new ELFPlugin(node.getPath());
}
bool ELFPluginProvider::isPluginFilename(const Common::FSNode &node) const {
// Check the plugin suffix
// FIXME: Do we need these printfs? Should get rid of them eventually.
Common::String filename = node.getName();
printf("Testing name %s", filename.c_str());
if (!filename.hasSuffix(".PLG") && !filename.hasSuffix(".plg") && !filename.hasSuffix(".PLUGIN") && !filename.hasSuffix(".plugin")) {
printf(" fail.\n");
return false;
}
printf(" success!\n");
return true;
}
#endif // defined(DYNAMIC_MODULES)
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