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Added plugin providers for Win32 and DC

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svn-id: r24149
This commit is contained in:
Max Horn 2006-10-07 00:31:33 +00:00
parent 26e4e16800
commit 8d82ffd31b
6 changed files with 343 additions and 60 deletions
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130
backends/plugins/dc/dc-provider.cpp Normal file
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@ -0,0 +1,130 @@
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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) && defined(__DC__)
#include "backends/plugins/dc/dc-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/fs.h"
#include "dcloader.h"
#define PLUGIN_DIRECTORY "/"
#define PLUGIN_PREFIX ""
#define PLUGIN_SUFFIX ".PLG"
class DCPlugin : public DynamicPlugin {
protected:
void *_dlHandle;
Common::String _filename;
virtual VoidFunc findSymbol(const char *symbol) {
void *func = dlsym(_dlHandle, symbol);
if (!func)
warning("Failed loading symbol '%s' from plugin '%s' (%s)", symbol, _filename.c_str(), dlerror());
// 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:
DCPlugin(const Common::String &filename)
: _dlHandle(0), _filename(filename) {}
bool loadPlugin() {
assert(!_dlHandle);
_dlHandle = dlopen(_filename.c_str(), RTLD_LAZY);
if (!_dlHandle) {
warning("Failed loading plugin '%s' (%s)", _filename.c_str(), dlerror());
return false;
}
bool ret = DynamicPlugin::loadPlugin();
if (ret)
dlforgetsyms(_dlHandle);
return ret;
}
void unloadPlugin() {
if (_dlHandle) {
if (dlclose(_dlHandle) != 0)
warning("Failed unloading plugin '%s' (%s)", _filename.c_str(), dlerror());
}
}
};
DCPluginProvider::DCPluginProvider() {
}
DCPluginProvider::~DCPluginProvider() {
}
PluginList DCPluginProvider::getPlugins() {
PluginList pl;
// Load dynamic plugins
// TODO... this is right now just a nasty hack.
// This should search one or multiple directories for all plugins it can
// find (to this end, we maybe should use a special prefix/suffix; e.g.
// instead of libscumm.so, use scumm.engine or scumm.plugin etc.).
//
// The list of directories to search could be e.g.:
// User specified (via config file), ".", "./plugins", "$(prefix)/lib".
//
// We also need to add code which ensures what we are looking at is
// a) a ScummVM engine and b) matches the version of the executable.
// Hence one more symbol should be exported by plugins which returns
// the "ABI" version the plugin was built for, and we can compare that
// to the ABI version of the executable.
// Load all plugins.
// Scan for all plugins in this directory
FilesystemNode dir(PLUGIN_DIRECTORY);
FSList files;
if (!dir.listDir(files, FilesystemNode::kListFilesOnly)) {
error("Couldn't open plugin directory '%s'", PLUGIN_DIRECTORY);
}
for (FSList::const_iterator i = files.begin(); i != files.end(); ++i) {
Common::String name(i->name());
if (name.hasPrefix(PLUGIN_PREFIX) && name.hasSuffix(PLUGIN_SUFFIX)) {
pl.push_back(new DCPlugin(i->path()));
}
}
return pl;
}
#endif // defined(DYNAMIC_MODULES) && defined(__DC__)

42
backends/plugins/dc/dc-provider.h Normal file
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@ -0,0 +1,42 @@
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#ifndef BACKENDS_PLUGINS_DC_H
#define BACKENDS_PLUGINS_DC_H
#include "common/stdafx.h"
#include "base/plugins.h"
#if defined(DYNAMIC_MODULES) && defined(__DC__)
class DCPluginProvider : public PluginProvider {
public:
DCPluginProvider();
~DCPluginProvider();
virtual PluginList getPlugins();
};
#endif // defined(DYNAMIC_MODULES) && defined(__DC__)
#endif

61
backends/plugins/posix/posix-provider.cpp
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@ -21,33 +21,15 @@
*
*/
#ifdef DYNAMIC_MODULES
#if defined(DYNAMIC_MODULES) && defined(UNIX)
#include "backends/plugins/posix/posix-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/fs.h"
#include "common/util.h"
#if defined(UNIX)
#include <dlfcn.h>
#define PLUGIN_DIRECTORY "plugins/"
#elif defined(__DC__)
#include "dcloader.h"
#define PLUGIN_DIRECTORY "/"
#define PLUGIN_PREFIX ""
#define PLUGIN_SUFFIX ".PLG"
#elif defined(_WIN32)
#define PLUGIN_DIRECTORY ""
#define PLUGIN_PREFIX ""
#define PLUGIN_SUFFIX ".dll"
#else
#error No support for loading plugins on non-unix systems at this point!
#endif
class POSIXPlugin : public DynamicPlugin {
protected:
@ -55,19 +37,9 @@ protected:
Common::String _filename;
virtual VoidFunc findSymbol(const char *symbol) {
#if defined(UNIX) || defined(__DC__)
void *func = dlsym(_dlHandle, symbol);
if (!func)
warning("Failed loading symbol '%s' from plugin '%s' (%s)", symbol, _filename.c_str(), dlerror());
#else
#if defined(_WIN32)
void *func = (void *)GetProcAddress((HMODULE)_dlHandle, symbol);
if (!func)
warning("Failed loading symbol '%s' from plugin '%s'", symbol, _filename.c_str());
#else
#error TODO
#endif
#endif
// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
// standard and POSIX: ISO C++ disallows casting between function pointers
@ -85,46 +57,19 @@ public:
bool loadPlugin() {
assert(!_dlHandle);
#if defined(UNIX) || defined(__DC__)
_dlHandle = dlopen(_filename.c_str(), RTLD_LAZY);
if (!_dlHandle) {
warning("Failed loading plugin '%s' (%s)", _filename.c_str(), dlerror());
return false;
}
#else
#if defined(_WIN32)
_dlHandle = LoadLibrary(_filename.c_str());
if (!_dlHandle) {
warning("Failed loading plugin '%s'", _filename.c_str());
return false;
}
#else
#error TODO
#endif
#endif
bool ret = DynamicPlugin::loadPlugin();
#ifdef __DC__
if (ret)
dlforgetsyms(_dlHandle);
#endif
return ret;
return DynamicPlugin::loadPlugin();
}
void unloadPlugin() {
if (_dlHandle) {
#if defined(UNIX) || defined(__DC__)
if (dlclose(_dlHandle) != 0)
warning("Failed unloading plugin '%s' (%s)", _filename.c_str(), dlerror());
#elif defined(_WIN32)
if (!FreeLibrary((HMODULE)_dlHandle))
warning("Failed unloading plugin '%s'", _filename.c_str());
#else
#error TODO
#endif
}
}
};
@ -175,4 +120,4 @@ PluginList POSIXPluginProvider::getPlugins() {
}
#endif // DYNAMIC_MODULES
#endif // defined(DYNAMIC_MODULES) && defined(UNIX)

4
backends/plugins/posix/posix-provider.h
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@ -27,7 +27,7 @@
#include "common/stdafx.h"
#include "base/plugins.h"
#ifdef DYNAMIC_MODULES
#if defined(DYNAMIC_MODULES) && defined(UNIX)
class POSIXPluginProvider : public PluginProvider {
public:
@ -37,6 +37,6 @@ public:
virtual PluginList getPlugins();
};
#endif
#endif // defined(DYNAMIC_MODULES) && defined(UNIX)
#endif

124
backends/plugins/win32/win32-provider.cpp Normal file
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@ -0,0 +1,124 @@
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#ifdef DYNAMIC_MODULES
#include "backends/plugins/win32/win32-provider.h"
#include "backends/plugins/dynamic-plugin.h"
#include "common/fs.h"
#define PLUGIN_DIRECTORY ""
#define PLUGIN_PREFIX ""
#define PLUGIN_SUFFIX ".dll"
class Win32Plugin : public DynamicPlugin {
protected:
void *_dlHandle;
Common::String _filename;
virtual VoidFunc findSymbol(const char *symbol) {
void *func = (void *)GetProcAddress((HMODULE)_dlHandle, symbol);
if (!func)
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:
Win32Plugin(const Common::String &filename)
: _dlHandle(0), _filename(filename) {}
bool loadPlugin() {
assert(!_dlHandle);
_dlHandle = LoadLibrary(_filename.c_str());
if (!_dlHandle) {
warning("Failed loading plugin '%s'", _filename.c_str());
return false;
}
return DynamicPlugin::loadPlugin();
}
void unloadPlugin() {
if (_dlHandle) {
if (!FreeLibrary((HMODULE)_dlHandle))
warning("Failed unloading plugin '%s'", _filename.c_str());
}
}
};
Win32PluginProvider::Win32PluginProvider() {
}
Win32PluginProvider::~Win32PluginProvider() {
}
PluginList Win32PluginProvider::getPlugins() {
PluginList pl;
// Load dynamic plugins
// TODO... this is right now just a nasty hack.
// This should search one or multiple directories for all plugins it can
// find (to this end, we maybe should use a special prefix/suffix; e.g.
// instead of libscumm.so, use scumm.engine or scumm.plugin etc.).
//
// The list of directories to search could be e.g.:
// User specified (via config file), ".", "./plugins", "$(prefix)/lib".
//
// We also need to add code which ensures what we are looking at is
// a) a ScummVM engine and b) matches the version of the executable.
// Hence one more symbol should be exported by plugins which returns
// the "ABI" version the plugin was built for, and we can compare that
// to the ABI version of the executable.
// Load all plugins.
// Scan for all plugins in this directory
FilesystemNode dir(PLUGIN_DIRECTORY);
FSList files;
if (!dir.listDir(files, FilesystemNode::kListFilesOnly)) {
error("Couldn't open plugin directory '%s'", PLUGIN_DIRECTORY);
}
for (FSList::const_iterator i = files.begin(); i != files.end(); ++i) {
Common::String name(i->name());
if (name.hasPrefix(PLUGIN_PREFIX) && name.hasSuffix(PLUGIN_SUFFIX)) {
pl.push_back(new Win32Plugin(i->path()));
}
}
return pl;
}
#endif // DYNAMIC_MODULES

42
backends/plugins/win32/win32-provider.h Normal file
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@ -0,0 +1,42 @@
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#ifndef BACKENDS_PLUGINS_WIN32_H
#define BACKENDS_PLUGINS_WIN32_H
#include "common/stdafx.h"
#include "base/plugins.h"
#if defined(DYNAMIC_MODULES) && defined(_WIN32)
class Win32PluginProvider : public PluginProvider {
public:
Win32PluginProvider();
~Win32PluginProvider();
virtual PluginList getPlugins();
};
#endif // defined(DYNAMIC_MODULES) && defined(_WIN32)
#endif