1 /*
2  * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
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
6  * under the terms of the GNU General Public License version 2 only, as
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.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
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     }
70     int i, first = 0;
71     for (i = 0; i < n_libs; i++) {
72         load_order[i] = &gtk_libs[i];
73         if (load_order[i]->version == version) {
74             first = i;
75         }
76     }
77     if (first) {
78         for (i = first; i > 0; i--) {
79             load_order[i] = load_order[i - 1];
80         }
81         load_order[0] = &gtk_libs[first];
82     }
83     return load_order;
84 }
85 
get_loaded()86 static GtkLib* get_loaded() {
87     GtkLib** libs = get_libs_order(GTK_ANY);
88     while(!gtk && *libs) {
89         GtkLib* lib = *libs++;
90         if (lib->check(lib->vname, /* load = */FALSE)) {
91             return lib;
92         }
93         if (lib->check(lib->name, /* load = */FALSE)) {
94             return lib;
95         }
96     }
97     return NULL;
98 }
99 
gtk_load(JNIEnv * env,GtkVersion version,gboolean verbose)100 gboolean gtk_load(JNIEnv *env, GtkVersion version, gboolean verbose) {
101     if (gtk == NULL) {
102         GtkLib* lib = get_loaded();
103         if (lib) {
104             if (verbose) {
105                 fprintf(stderr, "Looking for GTK%d library...\n",
106                                                                  lib->version);
107             }
108             gtk = lib->load(env, lib->vname);
109             if (!gtk) {
110                 gtk = lib->load(env, lib->name);
111             }
112         } else {
113             GtkLib** libs = get_libs_order(version);
114             while (!gtk && *libs) {
115                 lib = *libs++;
116                 if (version == GTK_ANY || lib->version == version) {
117                     if (verbose) {
118                         fprintf(stderr, "Looking for GTK%d library...\n",
119                                                                   lib->version);
120                     }
121                     gtk = lib->load(env, lib->vname);
122                     if (!gtk) {
123                         gtk = lib->load(env, lib->name);
124                     }
125                     if (verbose && !gtk) {
126                         fprintf(stderr, "Not found.\n");
127                     }
128                 }
129             }
130         }
131         if (verbose) {
132             if (gtk) {
133                 fprintf(stderr, "GTK%d library loaded.\n", lib->version);
134             } else {
135                 fprintf(stderr, "Failed to load GTK library.\n");
136             }
137         }
138     }
139     return gtk != NULL;
140 }
141 
check_version(GtkVersion version)142 static gboolean check_version(GtkVersion version) {
143     GtkLib** libs = get_libs_order(version);
144     while (*libs) {
145         GtkLib* lib = *libs++;
146         if (lib->check(lib->vname, /* load = */TRUE)) {
147             return TRUE;
148         }
149         if (lib->check(lib->name, /* load = */TRUE)) {
150             return TRUE;
151         }
152      }
153     return FALSE;
154 }
155 
gtk_check_version(GtkVersion version)156 gboolean gtk_check_version(GtkVersion version) {
157     if (gtk || get_loaded()) {
158         return TRUE;
159     }
160     return check_version(version);
161 }
162