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, see <http://www.gnu.org/licenses/>.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include <sys/types.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdio.h>
  28 #include "gcontenttype.h"
  29 #include "gthemedicon.h"
  30 #include "gicon.h"
  31 #include "glibintl.h"
  32
  33 #include <windows.h>
  34
  35 static char *
  36 get_registry_classes_key (const char    *subdir,
  37                           const wchar_t *key_name)
  38 {
  39   wchar_t *wc_key;
  40   HKEY reg_key = NULL;
  41   DWORD key_type;
  42   DWORD nbytes;
  43   char *value_utf8;
  44
  45   value_utf8 = NULL;
  46
  47   nbytes = 0;
  48   wc_key = g_utf8_to_utf16 (subdir, -1, NULL, NULL, NULL);
  49   if (RegOpenKeyExW (HKEY_CLASSES_ROOT, wc_key, 0,
  50                      KEY_QUERY_VALUE, &reg_key) == ERROR_SUCCESS &&
  51       RegQueryValueExW (reg_key, key_name, 0,
  52                         &key_type, NULL, &nbytes) == ERROR_SUCCESS &&
  53       (key_type == REG_SZ || key_type == REG_EXPAND_SZ))
  54     {
  55       wchar_t *wc_temp = g_new (wchar_t, (nbytes+1)/2 + 1);
  56       RegQueryValueExW (reg_key, key_name, 0,
  57                         &key_type, (LPBYTE) wc_temp, &nbytes);
  58       wc_temp[nbytes/2] = '\0';
  59       if (key_type == REG_EXPAND_SZ)
  60         {
  61           wchar_t dummy[1];
  62           int len = ExpandEnvironmentStringsW (wc_temp, dummy, 1);
  63           if (len > 0)
  64             {
  65               wchar_t *wc_temp_expanded = g_new (wchar_t, len);
  66               if (ExpandEnvironmentStringsW (wc_temp, wc_temp_expanded, len) == len)
  67                 value_utf8 = g_utf16_to_utf8 (wc_temp_expanded, -1, NULL, NULL, NULL);
  68               g_free (wc_temp_expanded);
  69             }
  70         }
  71       else
  72         {
  73           value_utf8 = g_utf16_to_utf8 (wc_temp, -1, NULL, NULL, NULL);
  74         }
  75       g_free (wc_temp);
  76
  77     }
  78   g_free (wc_key);
  79
  80   if (reg_key != NULL)
  81     RegCloseKey (reg_key);
  82
  83   return value_utf8;
  84 }
  85
  86 gboolean
  87 g_content_type_equals (const gchar *type1,
  88                        const gchar *type2)
  89 {
  90   char *progid1, *progid2;
  91   gboolean res;
  92
  93   g_return_val_if_fail (type1 != NULL, FALSE);
  94   g_return_val_if_fail (type2 != NULL, FALSE);
  95
  96   if (g_ascii_strcasecmp (type1, type2) == 0)
  97     return TRUE;
  98
  99   res = FALSE;
 100   progid1 = get_registry_classes_key (type1, NULL);
 101   progid2 = get_registry_classes_key (type2, NULL);
 102   if (progid1 != NULL && progid2 != NULL &&
 103       strcmp (progid1, progid2) == 0)
 104     res = TRUE;
 105   g_free (progid1);
 106   g_free (progid2);
 107
 108   return res;
 109 }
 110
 111 gboolean
 112 g_content_type_is_a (const gchar *type,
 113                      const gchar *supertype)
 114 {
 115   gboolean res;
 116   char *value_utf8;
 117
 118   g_return_val_if_fail (type != NULL, FALSE);
 119   g_return_val_if_fail (supertype != NULL, FALSE);
 120
 121   if (g_content_type_equals (type, supertype))
 122     return TRUE;
 123
 124   res = FALSE;
 125   value_utf8 = get_registry_classes_key (type, L"PerceivedType");
 126   if (value_utf8 && strcmp (value_utf8, supertype) == 0)
 127     res = TRUE;
 128   g_free (value_utf8);
 129
 130   return res;
 131 }
 132
 133 gboolean
 134 g_content_type_is_unknown (const gchar *type)
 135 {
 136   g_return_val_if_fail (type != NULL, FALSE);
 137
 138   return strcmp ("*", type) == 0;
 139 }
 140
 141 gchar *
 142 g_content_type_get_description (const gchar *type)
 143 {
 144   char *progid;
 145   char *description;
 146
 147   g_return_val_if_fail (type != NULL, NULL);
 148
 149   progid = get_registry_classes_key (type, NULL);
 150   if (progid)
 151     {
 152       description = get_registry_classes_key (progid, NULL);
 153       g_free (progid);
 154
 155       if (description)
 156         return description;
 157     }
 158
 159   if (g_content_type_is_unknown (type))
 160     return g_strdup (_("Unknown type"));
 161
 162   return g_strdup_printf (_("%s filetype"), type);
 163 }
 164
 165 gchar *
 166 g_content_type_get_mime_type (const gchar *type)
 167 {
 168   char *mime;
 169
 170   g_return_val_if_fail (type != NULL, NULL);
 171
 172   mime = get_registry_classes_key (type, L"Content Type");
 173   if (mime)
 174     return mime;
 175   else if (g_content_type_is_unknown (type))
 176     return g_strdup ("application/octet-stream");
 177   else if (*type == '.')
 178     return g_strdup_printf ("application/x-ext-%s", type+1);
 179   else if (strcmp ("inode/directory", type) == 0)
 180     return g_strdup (type);
 181   /* TODO: Map "image" to "image/ *", etc? */
 182
 183   return g_strdup ("application/octet-stream");
 184 }
 185
 186 G_LOCK_DEFINE_STATIC (_type_icons);
 187 static GHashTable *_type_icons = NULL;
 188
 189 GIcon *
 190 g_content_type_get_icon (const gchar *type)
 191 {
 192   GIcon *themed_icon;
 193   char *name = NULL;
 194
 195   g_return_val_if_fail (type != NULL, NULL);
 196
 197   /* In the Registry icons are the default value of
 198      HKEY_CLASSES_ROOT\<progid>\DefaultIcon with typical values like:
 199      <type>: <value>
 200      REG_EXPAND_SZ: %SystemRoot%\System32\Wscript.exe,3
 201      REG_SZ: shimgvw.dll,3
 202   */
 203   G_LOCK (_type_icons);
 204   if (!_type_icons)
 205     _type_icons = g_hash_table_new (g_str_hash, g_str_equal);
 206   name = g_hash_table_lookup (_type_icons, type);
 207   if (!name && type[0] == '.')
 208     {
 209       /* double lookup by extension */
 210       gchar *key = get_registry_classes_key (type, NULL);
 211       if (!key)
 212         key = g_strconcat (type+1, "file\\DefaultIcon", NULL);
 213       else
 214         {
 215           gchar *key2 = g_strconcat (key, "\\DefaultIcon", NULL);
 216           g_free (key);
 217           key = key2;
 218         }
 219       name = get_registry_classes_key (key, NULL);
 220       if (name && strcmp (name, "%1") == 0)
 221         {
 222           g_free (name);
 223           name = NULL;
 224         }
 225       if (name)
 226         g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 227       g_free (key);
 228     }
 229
 230   if (!name)
 231     {
 232       /* if no icon found, fall back to standard generic names */
 233       if (strcmp (type, "inode/directory") == 0)
 234         name = "folder";
 235       else if (g_content_type_can_be_executable (type))
 236         name = "system-run";
 237       else
 238         name = "text-x-generic";
 239       g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 240     }
 241   themed_icon = g_themed_icon_new (name);
 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   /* This is a hack to allow directories to have icons in filechooser */
 306   if (strcmp ("inode/directory", mime_type) == 0)
 307     return g_strdup (mime_type);
 308
 309   key = g_strconcat ("MIME\\DataBase\\Content Type\\", mime_type, NULL);
 310   content_type = get_registry_classes_key (key, L"Extension");
 311   g_free (key);
 312
 313   return content_type;
 314 }
 315
 316 gchar *
 317 g_content_type_guess (const gchar  *filename,
 318                       const guchar *data,
 319                       gsize         data_size,
 320                       gboolean     *result_uncertain)
 321 {
 322   char *basename;
 323   char *type;
 324   char *dot;
 325
 326   type = NULL;
 327
 328   if (result_uncertain)
 329     *result_uncertain = FALSE;
 330
 331   /* our test suite and potentially other code used -1 in the past, which is
 332    * not documented and not allowed; guard against that */
 333   g_return_val_if_fail (data_size != (gsize) -1, g_strdup ("*"));
 334
 335   if (filename)
 336     {
 337       basename = g_path_get_basename (filename);
 338       dot = strrchr (basename, '.');
 339       if (dot)
 340         type = g_strdup (dot);
 341       g_free (basename);
 342     }
 343
 344   if (type)
 345     return type;
 346
 347   if (data && looks_like_text (data, data_size))
 348     return g_strdup (".txt");
 349
 350   return g_strdup ("*");
 351 }
 352
 353 GList *
 354 g_content_types_get_registered (void)
 355 {
 356   DWORD index;
 357   wchar_t keyname[256];
 358   DWORD key_len;
 359   char *key_utf8;
 360   GList *types;
 361
 362   types = NULL;
 363   index = 0;
 364   key_len = 256;
 365   while (RegEnumKeyExW(HKEY_CLASSES_ROOT,
 366                        index,
 367                        keyname,
 368                        &key_len,
 369                        NULL,
 370                        NULL,
 371                        NULL,
 372                        NULL) == ERROR_SUCCESS)
 373     {
 374       key_utf8 = g_utf16_to_utf8 (keyname, -1, NULL, NULL, NULL);
 375       if (key_utf8)
 376         {
 377           if (*key_utf8 == '.')
 378             types = g_list_prepend (types, key_utf8);
 379           else
 380             g_free (key_utf8);
 381         }
 382       index++;
 383       key_len = 256;
 384     }
 385
 386   return g_list_reverse (types);
 387 }
 388
 389 gchar **
 390 g_content_type_guess_for_tree (GFile *root)
 391 {
 392   /* FIXME: implement */
 393   return NULL;
 394 }