gdk-pixbuf/queryloaders.c

   1 /* -*- mode: C; c-file-style: "linux" -*- */
   2 /* GdkPixbuf library
   3  * queryloaders.c:
   4  *
   5  * Copyright (C) 2002 The Free Software Foundation
   6  *
   7  * Author: Matthias Clasen <maclas@gmx.de>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Library General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Library General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Library General Public
  20  * License along with this library; if not, write to the
  21  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22  * Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <glib.h>
  28 #include <glib/gprintf.h>
  29 #include <gmodule.h>
  30
  31 #include <errno.h>
  32 #include <string.h>
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36
  37 #include "gdk-pixbuf/gdk-pixbuf.h"
  38 #include "gdk-pixbuf/gdk-pixbuf-private.h"
  39 #include "gdk-pixbuf/gdk-pixbuf-io.h"
  40
  41 #ifdef USE_LA_MODULES
  42 #define SOEXT ".la"
  43 #else
  44 #define SOEXT ("." G_MODULE_SUFFIX)
  45 #endif
  46 #define SOEXT_LEN (strlen (SOEXT))
  47
  48 #ifdef G_OS_WIN32
  49 #include <windows.h>
  50 #endif
  51
  52 static void
  53 print_escaped (const char *str)
  54 {
  55         gchar *tmp = g_strescape (str, "");
  56         g_printf ("\"%s\" ", tmp);
  57         g_free (tmp);
  58 }
  59
  60 static int
  61 loader_sanity_check (const char *path, GdkPixbufFormat *info, GdkPixbufModule *vtable)
  62 {
  63         const GdkPixbufModulePattern *pattern;
  64         const char *error = "";
  65
  66         for (pattern = info->signature; pattern->prefix; pattern++)
  67         {
  68                 int prefix_len = strlen (pattern->prefix);
  69                 if (prefix_len == 0)
  70                 {
  71                         error = "empty pattern";
  72
  73                         goto error;
  74                 }
  75                 if (pattern->mask)
  76                 {
  77                         int mask_len = strlen (pattern->mask);
  78                         if (mask_len != prefix_len)
  79                         {
  80                                 error = "mask length mismatch";
  81
  82                                 goto error;
  83                         }
  84                         if (strspn (pattern->mask, " !xzn*") < mask_len)
  85                         {
  86                                 error = "bad char in mask";
  87
  88                                 goto error;
  89                         }
  90                 }
  91         }
  92
  93         if (!vtable->load && !vtable->begin_load && !vtable->load_animation)
  94         {
  95                 error = "no load method implemented";
  96
  97                 goto error;
  98         }
  99
 100         if (vtable->begin_load && (!vtable->stop_load || !vtable->load_increment))
 101         {
 102                 error = "incremental loading support incomplete";
 103
 104                 goto error;
 105         }
 106
 107         if ((info->flags & GDK_PIXBUF_FORMAT_WRITABLE) && !(vtable->save || vtable->save_to_callback))
 108         {
 109                 error = "loader claims to support saving but doesn't implement save";
 110                 goto error;
 111         }
 112
 113         return 1;
 114
 115  error:
 116         g_fprintf (stderr, "Loader sanity check failed for %s: %s\n",
 117                    path, error);
 118
 119         return 0;
 120 }
 121
 122 static void
 123 write_loader_info (const char *path, GdkPixbufFormat *info)
 124 {
 125         const GdkPixbufModulePattern *pattern;
 126         char **mime;
 127         char **ext;
 128
 129         g_printf("\"%s\"\n", path);
 130         g_printf ("\"%s\" %u \"%s\" \"%s\" \"%s\"\n",
 131                   info->name, info->flags,
 132                   info->domain ? info->domain : GETTEXT_PACKAGE, info->description, info->license);
 133         for (mime = info->mime_types; *mime; mime++) {
 134                 g_printf ("\"%s\" ", *mime);
 135         }
 136         g_printf ("\"\"\n");
 137         for (ext = info->extensions; *ext; ext++) {
 138                 g_printf ("\"%s\" ", *ext);
 139         }
 140         g_printf ("\"\"\n");
 141         for (pattern = info->signature; pattern->prefix; pattern++) {
 142                 print_escaped (pattern->prefix);
 143                 print_escaped (pattern->mask ? (const char *)pattern->mask : "");
 144                 g_printf ("%d\n", pattern->relevance);
 145         }
 146         g_printf ("\n");
 147 }
 148
 149 static void
 150 query_module (const char *dir, const char *file)
 151 {
 152         char *path;
 153         GModule *module;
 154         void                    (*fill_info)     (GdkPixbufFormat *info);
 155         void                    (*fill_vtable)   (GdkPixbufModule *module);
 156
 157         if (g_path_is_absolute (file))
 158                 path = g_strdup (file);
 159         else
 160                 path = g_build_filename (dir, file, NULL);
 161
 162         module = g_module_open (path, 0);
 163         if (module &&
 164             g_module_symbol (module, "fill_info", (gpointer *) &fill_info) &&
 165             g_module_symbol (module, "fill_vtable", (gpointer *) &fill_vtable)) {
 166                 GdkPixbufFormat *info;
 167                 GdkPixbufModule *vtable;
 168
 169 #ifdef G_OS_WIN32
 170                 /* Replace backslashes in path with forward slashes, so that
 171                  * it reads in without problems.
 172                  */
 173                 {
 174                         char *p = path;
 175                         while (*p) {
 176                                 if (*p == '\\')
 177                                         *p = '/';
 178                                 p++;
 179                         }
 180                 }
 181 #endif
 182                 info = g_new0 (GdkPixbufFormat, 1);
 183                 vtable = g_new0 (GdkPixbufModule, 1);
 184
 185                 vtable->module = module;
 186
 187                 (*fill_info) (info);
 188                 (*fill_vtable) (vtable);
 189
 190                 if (loader_sanity_check (path, info, vtable))
 191                         write_loader_info (path, info);
 192
 193                 g_free (info);
 194                 g_free (vtable);
 195         }
 196         else {
 197                 if (module == NULL)
 198                         g_fprintf (stderr, "g_module_open() failed for %s: %s\n", path,
 199                                    g_module_error());
 200                 else
 201                         g_fprintf (stderr, "Cannot load loader %s\n", path);
 202         }
 203         if (module)
 204                 g_module_close (module);
 205         g_free (path);
 206 }
 207
 208 int main (int argc, char **argv)
 209 {
 210         gint i;
 211         gchar *prgname;
 212
 213 #ifdef G_OS_WIN32
 214         gchar *libdir;
 215         gchar *runtime_prefix;
 216         gchar *slash;
 217
 218         if (g_ascii_strncasecmp (PIXBUF_LIBDIR, GTK_PREFIX, strlen (GTK_PREFIX)) == 0 &&
 219             G_IS_DIR_SEPARATOR (PIXBUF_LIBDIR[strlen (GTK_PREFIX)])) {
 220                 /* GTK_PREFIX is a prefix of PIXBUF_LIBDIR, as it
 221                  * normally is. Replace that prefix in PIXBUF_LIBDIR
 222                  * with the installation directory on this machine.
 223                  * We assume this invokation of
 224                  * gdk-pixbuf-query-loaders is run from either a "bin"
 225                  * subdirectory of the installation directory, or in
 226                  * the installation directory itself.
 227                  */
 228                 if (G_WIN32_HAVE_WIDECHAR_API ()) {
 229                         wchar_t fn[1000];
 230                         GetModuleFileNameW (NULL, fn, G_N_ELEMENTS (fn));
 231                         runtime_prefix = g_utf16_to_utf8 (fn, -1, NULL, NULL, NULL);
 232                 }
 233                 else {
 234                         char fn[1000];
 235                         GetModuleFileNameA (NULL, fn, G_N_ELEMENTS (fn));
 236                         runtime_prefix = g_locale_to_utf8 (fn, -1, NULL, NULL, NULL);
 237                 }
 238                 slash = strrchr (runtime_prefix, '\\');
 239                 *slash = '\0';
 240                 slash = strrchr (runtime_prefix, '\\');
 241                 if (slash != NULL && g_ascii_strcasecmp (slash + 1, "bin") == 0) {
 242                         *slash = '\0';
 243                 }
 244
 245                 libdir = g_strconcat (runtime_prefix,
 246                                       "/",
 247                                       PIXBUF_LIBDIR + strlen (GTK_PREFIX) + 1,
 248                                       NULL);
 249         }
 250         else {
 251                 libdir = PIXBUF_LIBDIR;
 252         }
 253
 254 #undef PIXBUF_LIBDIR
 255 #define PIXBUF_LIBDIR libdir
 256
 257 #endif
 258         prgname = g_get_prgname ();
 259         g_printf ("# GdkPixbuf Image Loader Modules file\n"
 260                   "# Automatically generated file, do not edit\n"
 261                   "# Created by %s from gtk+-%s\n"
 262                   "#\n",
 263                   (prgname ? prgname : "gdk-pixbuf-query-loaders"),
 264                   GDK_PIXBUF_VERSION);
 265
 266         if (argc == 1) {
 267 #ifdef USE_GMODULE
 268                 const char *path;
 269                 GDir *dir;
 270
 271                 path = g_getenv ("GDK_PIXBUF_MODULEDIR");
 272 #ifdef G_OS_WIN32
 273                 if (path != NULL && *path != '\0')
 274                         path = g_locale_to_utf8 (path, -1, NULL, NULL, NULL);
 275 #endif
 276                 if (path == NULL || *path == '\0')
 277                         path = PIXBUF_LIBDIR;
 278
 279                 g_printf ("# LoaderDir = %s\n#\n", path);
 280
 281                 dir = g_dir_open (path, 0, NULL);
 282                 if (dir) {
 283                         const char *dent;
 284
 285                         while ((dent = g_dir_read_name (dir))) {
 286                                 gint len = strlen (dent);
 287                                 if (len > SOEXT_LEN &&
 288                                     strcmp (dent + len - SOEXT_LEN, SOEXT) == 0) {
 289                                         query_module (path, dent);
 290                                 }
 291                         }
 292                         g_dir_close (dir);
 293                 }
 294 #else
 295                 g_printf ("# dynamic loading of modules not supported\n");
 296 #endif
 297         }
 298         else {
 299                 char *cwd = g_get_current_dir ();
 300
 301                 for (i = 1; i < argc; i++) {
 302                         char *infilename = argv[i];
 303 #ifdef G_OS_WIN32
 304                         infilename = g_locale_to_utf8 (infilename,
 305                                                        -1, NULL, NULL, NULL);
 306 #endif
 307                         query_module (cwd, infilename);
 308                 }
 309                 g_free (cwd);
 310         }
 311
 312         return 0;
 313 }