1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* 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.
*
* $URL$
* $Id$
*
*/
#ifndef BACKENDS_PLUGINS_DYNAMICPLUGIN_H
#define BACKENDS_PLUGINS_DYNAMICPLUGIN_H
#include "base/plugins.h"
/** Type of factory functions which make new Engine objects. */
typedef PluginError (*EngineFactory)(OSystem *syst, Engine **engine);
typedef const char *(*NameFunc)();
typedef GameDescriptor (*GameIDQueryFunc)(const char *gameid);
typedef GameList (*GameIDListFunc)();
typedef GameList (*DetectFunc)(const FSList &fslist);
class DynamicPlugin : public Plugin {
protected:
typedef void (*VoidFunc)();
Common::String _name;
Common::String _copyright;
GameIDQueryFunc _qf;
EngineFactory _ef;
DetectFunc _df;
GameList _games;
virtual VoidFunc findSymbol(const char *symbol) = 0;
public:
DynamicPlugin() : _qf(0), _ef(0), _df(0), _games() {}
const char *getName() const { return _name.c_str(); }
const char *getCopyright() const { return _copyright.c_str(); }
PluginError createInstance(OSystem *syst, Engine **engine) const {
assert(_ef);
return (*_ef)(syst, engine);
}
GameList getSupportedGames() const { return _games; }
GameDescriptor findGame(const char *gameid) const {
assert(_qf);
return (*_qf)(gameid);
}
GameList detectGames(const FSList &fslist) const {
assert(_df);
return (*_df)(fslist);
}
virtual bool loadPlugin() {
// Query the plugin's name
NameFunc nameFunc = (NameFunc)findSymbol("PLUGIN_name");
if (!nameFunc) {
unloadPlugin();
return false;
}
_name = nameFunc();
// Query the plugin's copyright
nameFunc = (NameFunc)findSymbol("PLUGIN_copyright");
if (!nameFunc) {
unloadPlugin();
return false;
}
_copyright = nameFunc();
// Query the plugin for the game ids it supports
GameIDListFunc gameListFunc = (GameIDListFunc)findSymbol("PLUGIN_gameIDList");
if (!gameListFunc) {
unloadPlugin();
return false;
}
_games = gameListFunc();
// Retrieve the gameid query function
_qf = (GameIDQueryFunc)findSymbol("PLUGIN_findGameID");
if (!_qf) {
unloadPlugin();
return false;
}
// Retrieve the factory function
_ef = (EngineFactory)findSymbol("PLUGIN_createEngine");
if (!_ef) {
unloadPlugin();
return false;
}
// Retrieve the detector function
_df = (DetectFunc)findSymbol("PLUGIN_detectGames");
if (!_df) {
unloadPlugin();
return false;
}
return true;
}
};
#endif
|
