gio/gcontenttype-win32.c

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2006-2007 Red Hat, Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General
  18  * Public License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  *
  22  * Author: Alexander Larsson <alexl@redhat.com>
  23  */
  24
  25 #include "config.h"
  26 #include <sys/types.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include "gcontenttype.h"
  31 #include "gthemedicon.h"
  32 #include "gicon.h"
  33 #include "glibintl.h"
  34
  35 #include <windows.h>
  36
  37 static char *
  38 get_registry_classes_key (const char    *subdir,
  39                           const wchar_t *key_name)
  40 {
  41   wchar_t *wc_key;
  42   HKEY reg_key = NULL;
  43   DWORD key_type;
  44   DWORD nbytes;
  45   char *value_utf8;
  46
  47   value_utf8 = NULL;
  48
  49   nbytes = 0;
  50   wc_key = g_utf8_to_utf16 (subdir, -1, NULL, NULL, NULL);
  51   if (RegOpenKeyExW (HKEY_CLASSES_ROOT, wc_key, 0,
  52                      KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS &&
  53       RegQueryValueExW (reg_key, key_name, 0,
  54                         &key_type, NULL, &nbytes) == ERROR_SUCCESS &&
  55       (key_type == REG_SZ || key_type == REG_EXPAND_SZ))
  56     {
  57       wchar_t *wc_temp = g_new (wchar_t, (nbytes+1)/2 + 1);
  58       RegQueryValueExW (reg_key, key_name, 0,
  59                         &key_type, (LPBYTE) wc_temp, &nbytes);
  60       wc_temp[nbytes/2] = '\0';
  61       if (key_type == REG_EXPAND_SZ)
  62         {
  63           wchar_t dummy[1];
  64           int len = ExpandEnvironmentStringsW (wc_temp, dummy, 1);
  65           if (len > 0)
  66             {
  67               wchar_t *wc_temp_expanded = g_new (wchar_t, len);
  68               if (ExpandEnvironmentStringsW (wc_temp, wc_temp_expanded, len) == len)
  69                 value_utf8 = g_utf16_to_utf8 (wc_temp_expanded, -1, NULL, NULL, NULL);
  70               g_free (wc_temp_expanded);
  71             }
  72         }
  73       else
  74         {
  75           value_utf8 = g_utf16_to_utf8 (wc_temp, -1, NULL, NULL, NULL);
  76         }
  77       g_free (wc_temp);
  78
  79     }
  80   g_free (wc_key);
  81
  82   if (reg_key != NULL)
  83     RegCloseKey (reg_key);
  84
  85   return value_utf8;
  86 }
  87
  88 gboolean
  89 g_content_type_equals (const gchar *type1,
  90                        const gchar *type2)
  91 {
  92   char *progid1, *progid2;
  93   gboolean res;
  94
  95   g_return_val_if_fail (type1 != NULL, FALSE);
  96   g_return_val_if_fail (type2 != NULL, FALSE);
  97
  98   if (g_ascii_strcasecmp (type1, type2) == 0)
  99     return TRUE;
 100
 101   res = FALSE;
 102   progid1 = get_registry_classes_key (type1, NULL);
 103   progid2 = get_registry_classes_key (type2, NULL);
 104   if (progid1 != NULL && progid2 != NULL &&
 105       strcmp (progid1, progid2) == 0)
 106     res = TRUE;
 107   g_free (progid1);
 108   g_free (progid2);
 109
 110   return res;
 111 }
 112
 113 gboolean
 114 g_content_type_is_a (const gchar *type,
 115                      const gchar *supertype)
 116 {
 117   gboolean res;
 118   char *value_utf8;
 119
 120   g_return_val_if_fail (type != NULL, FALSE);
 121   g_return_val_if_fail (supertype != NULL, FALSE);
 122
 123   if (g_content_type_equals (type, supertype))
 124     return TRUE;
 125
 126   res = FALSE;
 127   value_utf8 = get_registry_classes_key (type, L"PerceivedType");
 128   if (value_utf8 && strcmp (value_utf8, supertype) == 0)
 129     res = TRUE;
 130   g_free (value_utf8);
 131
 132   return res;
 133 }
 134
 135 gboolean
 136 g_content_type_is_unknown (const gchar *type)
 137 {
 138   g_return_val_if_fail (type != NULL, FALSE);
 139
 140   return strcmp ("*", type) == 0;
 141 }
 142
 143 gchar *
 144 g_content_type_get_description (const gchar *type)
 145 {
 146   char *progid;
 147   char *description;
 148
 149   g_return_val_if_fail (type != NULL, NULL);
 150
 151   progid = get_registry_classes_key (type, NULL);
 152   if (progid)
 153     {
 154       description = get_registry_classes_key (progid, NULL);
 155       g_free (progid);
 156
 157       if (description)
 158         return description;
 159     }
 160
 161   if (g_content_type_is_unknown (type))
 162     return g_strdup (_("Unknown type"));
 163   return g_strdup_printf (_("%s filetype"), type);
 164 }
 165
 166 gchar *
 167 g_content_type_get_mime_type (const gchar *type)
 168 {
 169   char *mime;
 170
 171   g_return_val_if_fail (type != NULL, NULL);
 172
 173   mime = get_registry_classes_key (type, L"Content Type");
 174   if (mime)
 175     return mime;
 176   else if (g_content_type_is_unknown (type))
 177     return g_strdup ("application/octet-stream");
 178   else if (*type == '.')
 179     return g_strdup_printf ("application/x-ext-%s", type+1);
 180   /* TODO: Map "image" to "image/ *", etc? */
 181
 182   return g_strdup ("application/octet-stream");
 183 }
 184
 185 G_LOCK_DEFINE_STATIC (_type_icons);
 186 static GHashTable *_type_icons = NULL;
 187
 188 GIcon *
 189 g_content_type_get_icon (const gchar *type)
 190 {
 191   GIcon *themed_icon;
 192   char *name = NULL;
 193
 194   g_return_val_if_fail (type != NULL, NULL);
 195
 196   /* In the Registry icons are the default value of
 197      HKEY_CLASSES_ROOT\<progid>\DefaultIcon with typical values like:
 198      <type>: <value>
 199      REG_EXPAND_SZ: %SystemRoot%\System32\Wscript.exe,3
 200      REG_SZ: shimgvw.dll,3
 201   */
 202   G_LOCK (_type_icons);
 203   if (!_type_icons)
 204     _type_icons = g_hash_table_new (g_str_hash, g_str_equal);
 205   name = g_hash_table_lookup (_type_icons, type);
 206   if (!name && type[0] == '.')
 207     {
 208       /* double lookup by extension */
 209       gchar *key = get_registry_classes_key (type, NULL);
 210       if (!key)
 211         key = g_strconcat (type+1, "file\\DefaultIcon", NULL);
 212       else
 213         {
 214           gchar *key2 = g_strconcat (key, "\\DefaultIcon", NULL);
 215           g_free (key);
 216           key = key2;
 217         }
 218       name = get_registry_classes_key (key, NULL);
 219       if (name && strcmp (name, "%1") == 0)
 220         {
 221           g_free (name);
 222           name = NULL;
 223         }
 224       if (name)
 225         g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 226       g_free (key);
 227     }
 228
 229   /* icon-name similar to how it was with gtk-2-12 */
 230   if (name)
 231     {
 232       themed_icon = g_themed_icon_new (name);
 233     }
 234   else
 235     {
 236       /* if not found an icon fall back to gtk-builtins */
 237       name = strcmp (type, "inode/directory") == 0 ? "gtk-directory" :
 238                            g_content_type_can_be_executable (type) ? "gtk-execute" : "gtk-file";
 239       g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 240       themed_icon = g_themed_icon_new_with_default_fallbacks (name);
 241     }
 242   G_UNLOCK (_type_icons);
 243
 244   return G_ICON (themed_icon);
 245 }
 246
 247 GIcon *
 248 g_content_type_get_symbolic_icon (const gchar *type)
 249 {
 250   return g_content_type_get_icon (type);
 251 }
 252
 253 gchar *
 254 g_content_type_get_generic_icon_name (const gchar *type)
 255 {
 256   return NULL;
 257 }
 258
 259 gboolean
 260 g_content_type_can_be_executable (const gchar *type)
 261 {
 262   g_return_val_if_fail (type != NULL, FALSE);
 263
 264   if (strcmp (type, ".exe") == 0 ||
 265       strcmp (type, ".com") == 0 ||
 266       strcmp (type, ".bat") == 0)
 267     return TRUE;
 268
 269   /* TODO: Also look at PATHEXT, which lists the extensions for
 270    * "scripts" in addition to those for true binary executables.
 271    *
 272    * (PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH for me
 273    * right now, for instance). And in a sense, all associated file
 274    * types are "executable" on Windows... You can just type foo.jpg as
 275    * a command name in cmd.exe, and it will run the application
 276    * associated with .jpg. Hard to say what this API actually means
 277    * with "executable".
 278    */
 279
 280   return FALSE;
 281 }
 282
 283 static gboolean
 284 looks_like_text (const guchar *data,
 285                  gsize         data_size)
 286 {
 287   gsize i;
 288   guchar c;
 289   for (i = 0; i < data_size; i++)
 290     {
 291       c = data[i];
 292       if (g_ascii_iscntrl (c) && !g_ascii_isspace (c) && c != '\b')
 293         return FALSE;
 294     }
 295   return TRUE;
 296 }
 297
 298 gchar *
 299 g_content_type_from_mime_type (const gchar *mime_type)
 300 {
 301   char *key, *content_type;
 302
 303   g_return_val_if_fail (mime_type != NULL, NULL);
 304
 305   key = g_strconcat ("MIME\\DataBase\\Content Type\\", mime_type, NULL);
 306   content_type = get_registry_classes_key (key, L"Extension");
 307   g_free (key);
 308
 309   return content_type;
 310 }
 311
 312 gchar *
 313 g_content_type_guess (const gchar  *filename,
 314                       const guchar *data,
 315                       gsize         data_size,
 316                       gboolean     *result_uncertain)
 317 {
 318   char *basename;
 319   char *type;
 320   char *dot;
 321
 322   type = NULL;
 323
 324   if (result_uncertain)
 325     *result_uncertain = FALSE;
 326
 327   /* our test suite and potentially other code used -1 in the past, which is
 328    * not documented and not allowed; guard against that */
 329   g_return_val_if_fail (data_size != (gsize) -1, g_strdup ("*"));
 330
 331   if (filename)
 332     {
 333       basename = g_path_get_basename (filename);
 334       dot = strrchr (basename, '.');
 335       if (dot)
 336         type = g_strdup (dot);
 337       g_free (basename);
 338     }
 339
 340   if (type)
 341     return type;
 342
 343   if (data && looks_like_text (data, data_size))
 344     return g_strdup (".txt");
 345
 346   return g_strdup ("*");
 347 }
 348
 349 GList *
 350 g_content_types_get_registered (void)
 351 {
 352   DWORD index;
 353   wchar_t keyname[256];
 354   DWORD key_len;
 355   char *key_utf8;
 356   GList *types;
 357
 358   types = NULL;
 359   index = 0;
 360   key_len = 256;
 361   while (RegEnumKeyExW(HKEY_CLASSES_ROOT,
 362                        index,
 363                        keyname,
 364                        &key_len,
 365                        NULL,
 366                        NULL,
 367                        NULL,
 368                        NULL) == ERROR_SUCCESS)
 369     {
 370       key_utf8 = g_utf16_to_utf8 (keyname, -1, NULL, NULL, NULL);
 371       if (key_utf8)
 372         {
 373           if (*key_utf8 == '.')
 374             types = g_list_prepend (types, key_utf8);
 375           else
 376             g_free (key_utf8);
 377         }
 378       index++;
 379       key_len = 256;
 380     }
 381
 382   return g_list_reverse (types);
 383 }
 384
 385 gchar **
 386 g_content_type_guess_for_tree (GFile *root)
 387 {
 388   /* FIXME: implement */
 389   return NULL;
 390 }