1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 #include <dlfcn.h>
26 #include <stdlib.h>
27 #include "jvm_md.h"
28 #include "gtk_interface.h"
29 
30 GtkApi* gtk2_load(JNIEnv *env, const char* lib_name);
31 GtkApi* gtk3_load(JNIEnv *env, const char* lib_name);
32 
33 gboolean gtk2_check(const char* lib_name, gboolean load);
34 gboolean gtk3_check(const char* lib_name, gboolean load);
35 
36 GtkApi *gtk;
37 
38 typedef struct {
39     GtkVersion version;
40     const char* name;
41     const char* vname;
42     GtkApi* (*load)(JNIEnv *env, const char* lib_name);
43     gboolean (*check)(const char* lib_name, gboolean load);
44 } GtkLib;
45 
46 static GtkLib gtk_libs[] = {
47     {
48         GTK_3,
49         JNI_LIB_NAME("gtk-3"),
50         VERSIONED_JNI_LIB_NAME("gtk-3", "0"),
51         &gtk3_load,
52         &gtk3_check
53     },
54     {
55         GTK_2,
56         JNI_LIB_NAME("gtk-x11-2.0"),
57         VERSIONED_JNI_LIB_NAME("gtk-x11-2.0", "0"),
58         &gtk2_load,
59         &gtk2_check
60     }
61 };
62 
get_libs_order(GtkVersion version)63 static GtkLib** get_libs_order(GtkVersion version) {
64     static GtkLib** load_order;
65     static int n_libs = 0;
66     if (!n_libs) {
67         n_libs = sizeof(gtk_libs) / sizeof(GtkLib);
68         load_order = calloc(n_libs + 1, sizeof(GtkLib *));
69         if (load_order == NULL) {
70           return NULL;
71         }
72     }
73     int i, first = 0;
74     for (i = 0; i < n_libs; i++) {
75         load_order[i] = &gtk_libs[i];
76         if (load_order[i]->version == version) {
77             first = i;
78         }
79     }
80     if (first) {
81         for (i = first; i > 0; i--) {
82             load_order[i] = load_order[i - 1];
83         }
84         load_order[0] = &gtk_libs[first];
85     }
86     return load_order;
87 }
88 
get_loaded()89 static GtkLib* get_loaded() {
90     GtkLib** libs = get_libs_order(GTK_ANY);
91     if (libs == NULL) return NULL;
92     while(!gtk && *libs) {
93         GtkLib* lib = *libs++;
94         if (lib->check(lib->vname, /* load = */FALSE)) {
95             return lib;
96         }
97         if (lib->check(lib->name, /* load = */FALSE)) {
98             return lib;
99         }
100     }
101     return NULL;
102 }
103 
gtk_load(JNIEnv * env,GtkVersion version,gboolean verbose)104 gboolean gtk_load(JNIEnv *env, GtkVersion version, gboolean verbose) {
105     if (gtk == NULL) {
106         GtkLib* lib = get_loaded();
107         if (lib) {
108             if (verbose) {
109                 fprintf(stderr, "Looking for GTK%d library...\n",
110                                                                  lib->version);
111             }
112             gtk = lib->load(env, lib->vname);
113             if (!gtk) {
114                 gtk = lib->load(env, lib->name);
115             }
116         } else {
117             GtkLib** libs = get_libs_order(version);
118             while (!gtk && libs && *libs) {
119                 lib = *libs++;
120                 if (version == GTK_ANY || lib->version == version) {
121                     if (verbose) {
122                         fprintf(stderr, "Looking for GTK%d library...\n",
123                                                                   lib->version);
124                     }
125                     gtk = lib->load(env, lib->vname);
126                     if (!gtk) {
127                         gtk = lib->load(env, lib->name);
128                     }
129                     if (verbose && !gtk) {
130                         fprintf(stderr, "Not found.\n");
131                     }
132                 }
133             }
134         }
135         if (verbose) {
136             if (gtk) {
137                 fprintf(stderr, "GTK%d library loaded.\n", lib->version);
138             } else {
139                 fprintf(stderr, "Failed to load GTK library.\n");
140             }
141         }
142     }
143     return gtk != NULL;
144 }
145 
check_version(GtkVersion version)146 static gboolean check_version(GtkVersion version) {
147     GtkLib** libs = get_libs_order(version);
148     if (libs == NULL) return FALSE;
149     while (*libs) {
150         GtkLib* lib = *libs++;
151         if (lib->check(lib->vname, /* load = */TRUE)) {
152             return TRUE;
153         }
154         if (lib->check(lib->name, /* load = */TRUE)) {
155             return TRUE;
156         }
157     }
158     return FALSE;
159 }
160 
gtk_check_version(GtkVersion version)161 gboolean gtk_check_version(GtkVersion version) {
162     if (gtk || get_loaded()) {
163         return TRUE;
164     }
165     return check_version(version);
166 }
167 
168