/[svn]/linuxsampler/trunk/src/plugins/InstrumentEditorFactory.cpp
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Annotation of /linuxsampler/trunk/src/plugins/InstrumentEditorFactory.cpp

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Revision 1602 - (hide annotations) (download)
Sat Dec 29 22:02:29 2007 UTC (12 years, 6 months ago) by schoenebeck
File size: 10218 byte(s)
* fixed endless loop which occured when loading an instrument editor
  plugin DLL on Windows systems failed (note: completely untested yet :) )

1 schoenebeck 1374 /***************************************************************************
2     * *
3     * Copyright (C) 2007 Christian Schoenebeck *
4     * *
5     * This program is free software; you can redistribute it and/or modify *
6     * it under the terms of the GNU General Public License as published by *
7     * the Free Software Foundation; either version 2 of the License, or *
8     * (at your option) any later version. *
9     * *
10     * This program is distributed in the hope that it will be useful, *
11     * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13     * GNU General Public License for more details. *
14     * *
15     * You should have received a copy of the GNU General Public License *
16     * along with this program; if not, write to the Free Software *
17     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
18     * MA 02111-1307 USA *
19     ***************************************************************************/
20    
21     #include "InstrumentEditorFactory.h"
22    
23 schoenebeck 1425 #include "../common/global_private.h"
24    
25 senoner 1478 #if defined(WIN32)
26     #include <windows.h>
27     #else
28 schoenebeck 1374 #include <dlfcn.h>
29     #include <errno.h>
30 senoner 1478 #include <dirent.h>
31 schoenebeck 1601 #include <sys/types.h>
32     #include <sys/stat.h>
33     #include <unistd.h>
34 senoner 1478 #endif
35 schoenebeck 1374 #include <string.h>
36    
37     #ifndef CONFIG_PLUGIN_DIR
38     # error "Configuration macro CONFIG_PLUGIN_DIR not defined!"
39     #endif // CONFIG_PLUGIN_DIR
40    
41 senoner 1481 #if defined(WIN32)
42     typedef void* (*InnerFactoryRegisterFunction)(void);
43     #endif
44    
45 schoenebeck 1374 namespace LinuxSampler {
46    
47     std::map<String, InstrumentEditorFactory::InnerFactory*> InstrumentEditorFactory::InnerFactories;
48    
49     bool InstrumentEditorFactory::bPluginsLoaded = false;
50    
51     std::list<void*> InstrumentEditorFactory::LoadedDLLs;
52    
53     std::vector<String> InstrumentEditorFactory::AvailableEditors() {
54     // make sure plugins were loaded already
55     LoadPlugins();
56     // render result
57     std::vector<String> result;
58     std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
59     for (; iter != InnerFactories.end(); iter++)
60     result.push_back(iter->first);
61     return result;
62     }
63    
64     std::vector<String> InstrumentEditorFactory::MatchingEditors(String sTypeName, String sTypeVersion) {
65     // make sure plugins were loaded already
66     LoadPlugins();
67     // render result
68     std::vector<String> result;
69     std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
70     for (; iter != InnerFactories.end(); iter++) {
71     InstrumentEditor* pEditor = iter->second->Create();
72     if (pEditor->IsTypeSupported(sTypeName, sTypeVersion))
73     result.push_back(iter->first);
74     iter->second->Destroy(pEditor);
75     }
76     return result;
77     }
78    
79     String InstrumentEditorFactory::AvailableEditorsAsString() {
80     std::vector<String> drivers = AvailableEditors();
81     String result;
82     std::vector<String>::iterator iter = drivers.begin();
83     for (; iter != drivers.end(); iter++) {
84     if (result != "") result += ",";
85     result += "'" + *iter + "'";
86     }
87     return result;
88     }
89    
90     InstrumentEditor* InstrumentEditorFactory::Create(String InstrumentEditorName) throw (Exception) {
91     if (InnerFactories.count(InstrumentEditorName)) {
92     InnerFactory* pInnerFactory = InnerFactories[InstrumentEditorName];
93     return pInnerFactory->Create();
94     } else throw Exception("unknown instrument editor");
95     }
96    
97     void InstrumentEditorFactory::Destroy(InstrumentEditor* pInstrumentEditor) throw (Exception) {
98     if (InnerFactories.count(pInstrumentEditor->Name())) {
99     InnerFactory* pInnerFactory = InnerFactories[pInstrumentEditor->Name()];
100     return pInnerFactory->Destroy(pInstrumentEditor);
101     } else throw Exception("unknown instrument editor");
102     }
103    
104     void InstrumentEditorFactory::LoadPlugins() {
105     if (!bPluginsLoaded) {
106     dmsg(1,("Loading instrument editor plugins..."));
107 senoner 1478 #if defined(WIN32)
108     WIN32_FIND_DATA win32FindData;
109 schoenebeck 1602 const String plugindir = (String)CONFIG_PLUGIN_DIR + (String)("\\*.DLL");
110 senoner 1478 HANDLE hDir = FindFirstFile(plugindir.c_str(), &win32FindData);
111     if (hDir == INVALID_HANDLE_VALUE) {
112 schoenebeck 1602 if (GetLastError() != ERROR_FILE_NOT_FOUND) {
113     std::cerr << "Could not open instrument editor plugins "
114     << "directory (" << CONFIG_PLUGIN_DIR << "), "
115     << "Error: " << GetLastError() << std::endl;
116     } else {
117     dmsg(1,("None"));
118 senoner 1478 }
119 schoenebeck 1602 // either dir doesn't exist or is empty
120     return;
121 senoner 1478 }
122    
123 schoenebeck 1602 do {
124     // skip directory entries
125     if (win32FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
126     continue;
127     // dir entry name as full qualified path
128     const String sPath = (String)CONFIG_PLUGIN_DIR + ((String)"\\" + (String)win32FindData.cFileName);
129     // load the DLL
130     HINSTANCE hinstLib;
131     void* pDLL = hinstLib = LoadLibrary(sPath.c_str());
132     if (!pDLL) {
133     std::cerr << "Failed to load instrument editor plugin: "
134     << sPath << std::endl;
135     continue;
136     }
137    
138     //(InnerFactory*) (*fn)(void);
139     InnerFactoryRegisterFunction fn =
140     (InnerFactoryRegisterFunction)
141 senoner 1481 GetProcAddress(
142     hinstLib,
143     "createInstrumentEditorInnerFactory"
144     );
145 schoenebeck 1602 if (fn == NULL) {
146     std::cerr << "ERROR: unable to find "
147     "createInstrumentEditorInnerFactory() "
148     "in DLL\n" << std::flush;
149     FreeLibrary(hinstLib);
150     continue;
151     }
152    
153     // get the plugin instance and register it to the factory
154    
155     InnerFactory* pInnerFactory = (InnerFactory*)fn();
156     if (!pInnerFactory) {
157     std::cerr << "ERROR: !pInnerFactory\n" << std::flush;
158     FreeLibrary(hinstLib);
159     continue;
160     }
161     InstrumentEditor* pEditor = pInnerFactory->Create();
162     if (InnerFactories.count(pEditor->Name())) {
163     std::cerr << "ERROR: a plugin with name '"
164     << pEditor->Name()
165     << "' already loaded (skipping)\n"
166     << std::flush;
167 senoner 1481 pInnerFactory->Destroy(pEditor);
168 schoenebeck 1602 FreeLibrary(hinstLib);
169     continue;
170 senoner 1478 }
171 schoenebeck 1602 InnerFactories[pEditor->Name()] = pInnerFactory;
172     pInnerFactory->Destroy(pEditor);
173    
174     LoadedDLLs.push_back(pDLL);
175     } while (FindNextFile(hDir, &win32FindData));
176     if (hDir != INVALID_HANDLE_VALUE) FindClose(hDir);
177 senoner 1478 #else // POSIX
178 schoenebeck 1374 DIR* hDir = opendir(CONFIG_PLUGIN_DIR);
179     if (!hDir) {
180     std::cerr << "Could not open instrument editor plugins directory "
181     << "(" << CONFIG_PLUGIN_DIR << "): "
182     << strerror(errno) << std::endl;
183     return;
184     }
185     for (dirent* pEntry = readdir(hDir); pEntry; pEntry = readdir(hDir)) {
186 schoenebeck 1601 // dir entry name as full qualified path
187     const String sPath = CONFIG_PLUGIN_DIR + ("/" + String(pEntry->d_name));
188 schoenebeck 1374 // skip entries that are not regular files
189 schoenebeck 1601 struct stat entry_stat;
190     if (lstat(sPath.c_str(), &entry_stat) != 0 ||
191     (entry_stat.st_mode & S_IFMT) != S_IFREG)
192     continue;
193 schoenebeck 1374 // skip files that are not .so files
194 schoenebeck 1601 if (sPath.length() < 3 ||
195 schoenebeck 1374 sPath.substr(sPath.length() - 3) != ".so" &&
196     sPath.find(".so.") == String::npos
197     ) continue;
198     // load the DLL (the plugins should register themselfes automatically)
199     void* pDLL = dlopen(sPath.c_str(), RTLD_NOW);
200     if (pDLL) LoadedDLLs.push_back(pDLL);
201     else {
202     std::cerr << "Failed to load instrument editor plugin: "
203     << sPath << std::endl;
204     }
205     }
206     closedir(hDir);
207 senoner 1478 #endif
208 schoenebeck 1374 bPluginsLoaded = true;
209     dmsg(1,("OK\n"));
210     }
211     }
212    
213     void InstrumentEditorFactory::ClosePlugins() {
214     if (LoadedDLLs.size()) {
215     dmsg(1,("Unloading instrument editor plugins..."));
216     // free all inner factories
217     {
218     std::map<String, InnerFactory*>::iterator iter = InnerFactories.begin();
219     for (; iter != InnerFactories.end(); iter++) delete iter->second;
220     InnerFactories.clear();
221     }
222     // free the DLLs
223     {
224     std::list<void*>::iterator iter = LoadedDLLs.begin();
225 senoner 1478 for (; iter != LoadedDLLs.end(); iter++) {
226     #if defined(WIN32)
227     FreeLibrary((HINSTANCE)*iter);
228     #else
229     dlclose(*iter);
230     #endif
231     }
232 schoenebeck 1374 LoadedDLLs.clear();
233     dmsg(1,("OK\n"));
234     }
235     }
236     bPluginsLoaded = false;
237     }
238    
239     } // namespace LinuxSampler

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