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 2.1 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_mime_type (const gchar *type,
 135                              const gchar *mime_type)
 136 {
 137   gchar *content_type;
 138   gboolean ret;
 139
 140   g_return_val_if_fail (type != NULL, FALSE);
 141   g_return_val_if_fail (mime_type != NULL, FALSE);
 142
 143   content_type = g_content_type_from_mime_type (mime_type);
 144   ret = g_content_type_is_a (type, content_type);
 145   g_free (content_type);
 146
 147   return ret;
 148 }
 149
 150 gboolean
 151 g_content_type_is_unknown (const gchar *type)
 152 {
 153   g_return_val_if_fail (type != NULL, FALSE);
 154
 155   return strcmp ("*", type) == 0;
 156 }
 157
 158 gchar *
 159 g_content_type_get_description (const gchar *type)
 160 {
 161   char *progid;
 162   char *description;
 163
 164   g_return_val_if_fail (type != NULL, NULL);
 165
 166   progid = get_registry_classes_key (type, NULL);
 167   if (progid)
 168     {
 169       description = get_registry_classes_key (progid, NULL);
 170       g_free (progid);
 171
 172       if (description)
 173         return description;
 174     }
 175
 176   if (g_content_type_is_unknown (type))
 177     return g_strdup (_("Unknown type"));
 178
 179   return g_strdup_printf (_("%s filetype"), type);
 180 }
 181
 182 gchar *
 183 g_content_type_get_mime_type (const gchar *type)
 184 {
 185   char *mime;
 186
 187   g_return_val_if_fail (type != NULL, NULL);
 188
 189   mime = get_registry_classes_key (type, L"Content Type");
 190   if (mime)
 191     return mime;
 192   else if (g_content_type_is_unknown (type))
 193     return g_strdup ("application/octet-stream");
 194   else if (*type == '.')
 195     return g_strdup_printf ("application/x-ext-%s", type+1);
 196   else if (strcmp ("inode/directory", type) == 0)
 197     return g_strdup (type);
 198   /* TODO: Map "image" to "image/ *", etc? */
 199
 200   return g_strdup ("application/octet-stream");
 201 }
 202
 203 G_LOCK_DEFINE_STATIC (_type_icons);
 204 static GHashTable *_type_icons = NULL;
 205
 206 GIcon *
 207 g_content_type_get_icon (const gchar *type)
 208 {
 209   GIcon *themed_icon;
 210   char *name = NULL;
 211
 212   g_return_val_if_fail (type != NULL, NULL);
 213
 214   /* In the Registry icons are the default value of
 215      HKEY_CLASSES_ROOT\<progid>\DefaultIcon with typical values like:
 216      <type>: <value>
 217      REG_EXPAND_SZ: %SystemRoot%\System32\Wscript.exe,3
 218      REG_SZ: shimgvw.dll,3
 219   */
 220   G_LOCK (_type_icons);
 221   if (!_type_icons)
 222     _type_icons = g_hash_table_new (g_str_hash, g_str_equal);
 223   name = g_hash_table_lookup (_type_icons, type);
 224   if (!name && type[0] == '.')
 225     {
 226       /* double lookup by extension */
 227       gchar *key = get_registry_classes_key (type, NULL);
 228       if (!key)
 229         key = g_strconcat (type+1, "file\\DefaultIcon", NULL);
 230       else
 231         {
 232           gchar *key2 = g_strconcat (key, "\\DefaultIcon", NULL);
 233           g_free (key);
 234           key = key2;
 235         }
 236       name = get_registry_classes_key (key, NULL);
 237       if (name && strcmp (name, "%1") == 0)
 238         {
 239           g_free (name);
 240           name = NULL;
 241         }
 242       if (name)
 243         g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 244       g_free (key);
 245     }
 246
 247   if (!name)
 248     {
 249       /* if no icon found, fall back to standard generic names */
 250       if (strcmp (type, "inode/directory") == 0)
 251         name = "folder";
 252       else if (g_content_type_can_be_executable (type))
 253         name = "system-run";
 254       else
 255         name = "text-x-generic";
 256       g_hash_table_insert (_type_icons, g_strdup (type), g_strdup (name));
 257     }
 258   themed_icon = g_themed_icon_new (name);
 259   G_UNLOCK (_type_icons);
 260
 261   return G_ICON (themed_icon);
 262 }
 263
 264 GIcon *
 265 g_content_type_get_symbolic_icon (const gchar *type)
 266 {
 267   return g_content_type_get_icon (type);
 268 }
 269
 270 gchar *
 271 g_content_type_get_generic_icon_name (const gchar *type)
 272 {
 273   return NULL;
 274 }
 275
 276 gboolean
 277 g_content_type_can_be_executable (const gchar *type)
 278 {
 279   g_return_val_if_fail (type != NULL, FALSE);
 280
 281   if (strcmp (type, ".exe") == 0 ||
 282       strcmp (type, ".com") == 0 ||
 283       strcmp (type, ".bat") == 0)
 284     return TRUE;
 285
 286   /* TODO: Also look at PATHEXT, which lists the extensions for
 287    * "scripts" in addition to those for true binary executables.
 288    *
 289    * (PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH for me
 290    * right now, for instance). And in a sense, all associated file
 291    * types are "executable" on Windows... You can just type foo.jpg as
 292    * a command name in cmd.exe, and it will run the application
 293    * associated with .jpg. Hard to say what this API actually means
 294    * with "executable".
 295    */
 296
 297   return FALSE;
 298 }
 299
 300 static gboolean
 301 looks_like_text (const guchar *data,
 302                  gsize         data_size)
 303 {
 304   gsize i;
 305   guchar c;
 306   for (i = 0; i < data_size; i++)
 307     {
 308       c = data[i];
 309       if (g_ascii_iscntrl (c) && !g_ascii_isspace (c) && c != '\b')
 310         return FALSE;
 311     }
 312   return TRUE;
 313 }
 314
 315 gchar *
 316 g_content_type_from_mime_type (const gchar *mime_type)
 317 {
 318   char *key, *content_type;
 319
 320   g_return_val_if_fail (mime_type != NULL, NULL);
 321
 322   /* This is a hack to allow directories to have icons in filechooser */
 323   if (strcmp ("inode/directory", mime_type) == 0)
 324     return g_strdup (mime_type);
 325
 326   key = g_strconcat ("MIME\\DataBase\\Content Type\\", mime_type, NULL);
 327   content_type = get_registry_classes_key (key, L"Extension");
 328   g_free (key);
 329
 330   return content_type;
 331 }
 332
 333 gchar *
 334 g_content_type_guess (const gchar  *filename,
 335                       const guchar *data,
 336                       gsize         data_size,
 337                       gboolean     *result_uncertain)
 338 {
 339   char *basename;
 340   char *type;
 341   char *dot;
 342
 343   type = NULL;
 344
 345   if (result_uncertain)
 346     *result_uncertain = FALSE;
 347
 348   /* our test suite and potentially other code used -1 in the past, which is
 349    * not documented and not allowed; guard against that */
 350   g_return_val_if_fail (data_size != (gsize) -1, g_strdup ("*"));
 351
 352   if (filename)
 353     {
 354       basename = g_path_get_basename (filename);
 355       dot = strrchr (basename, '.');
 356       if (dot)
 357         type = g_strdup (dot);
 358       g_free (basename);
 359     }
 360
 361   if (type)
 362     return type;
 363
 364   if (data && looks_like_text (data, data_size))
 365     return g_strdup (".txt");
 366
 367   return g_strdup ("*");
 368 }
 369
 370 GList *
 371 g_content_types_get_registered (void)
 372 {
 373   DWORD index;
 374   wchar_t keyname[256];
 375   DWORD key_len;
 376   char *key_utf8;
 377   GList *types;
 378
 379   types = NULL;
 380   index = 0;
 381   key_len = 256;
 382   while (RegEnumKeyExW(HKEY_CLASSES_ROOT,
 383                        index,
 384                        keyname,
 385                        &key_len,
 386                        NULL,
 387                        NULL,
 388                        NULL,
 389                        NULL) == ERROR_SUCCESS)
 390     {
 391       key_utf8 = g_utf16_to_utf8 (keyname, -1, NULL, NULL, NULL);
 392       if (key_utf8)
 393         {
 394           if (*key_utf8 == '.')
 395             types = g_list_prepend (types, key_utf8);
 396           else
 397             g_free (key_utf8);
 398         }
 399       index++;
 400       key_len = 256;
 401     }
 402
 403   return g_list_reverse (types);
 404 }
 405
 406 gchar **
 407 g_content_type_guess_for_tree (GFile *root)
 408 {
 409   /* FIXME: implement */
 410   return NULL;
 411 }