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author | Max Horn | 2006-10-07 00:22:48 +0000 |
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committer | Max Horn | 2006-10-07 00:22:48 +0000 |
commit | 26e4e1680050448ad85693d7be5cb07abdeab89c (patch) | |
tree | e4db82b38686ee9b26cdaf0d96afe38e904c4161 /backends/plugins/posix/posix-provider.cpp | |
parent | 1373686c348f33634bc284c993cb0d5c2b6f0ff6 (diff) | |
download | scummvm-rg350-26e4e1680050448ad85693d7be5cb07abdeab89c.tar.gz scummvm-rg350-26e4e1680050448ad85693d7be5cb07abdeab89c.tar.bz2 scummvm-rg350-26e4e1680050448ad85693d7be5cb07abdeab89c.zip |
Started to refactor the plugin code (moving backend specific stuff into backends/plugins/)
svn-id: r24148
Diffstat (limited to 'backends/plugins/posix/posix-provider.cpp')
-rw-r--r-- | backends/plugins/posix/posix-provider.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/backends/plugins/posix/posix-provider.cpp b/backends/plugins/posix/posix-provider.cpp new file mode 100644 index 0000000000..bbc03938fe --- /dev/null +++ b/backends/plugins/posix/posix-provider.cpp @@ -0,0 +1,178 @@ +/* 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/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: + void *_dlHandle; + 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 + // 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: + POSIXPlugin(const Common::String &filename) + : _dlHandle(0), _filename(filename) {} + + 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; + } + 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 + } + } +}; + + +POSIXPluginProvider::POSIXPluginProvider() { +} + +POSIXPluginProvider::~POSIXPluginProvider() { +} + +PluginList POSIXPluginProvider::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 POSIXPlugin(i->path())); + } + } + + + return pl; +} + + +#endif // DYNAMIC_MODULES |