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/* -*- mode: C; c-file-style: "gnu" -*- */
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/* xdgmime.c: XDG Mime Spec mime resolver. Based on version 0.11 of the spec.
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* More info can be found at http://www.freedesktop.org/standards/
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* Copyright (C) 2003,2004 Red Hat, Inc.
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* Copyright (C) 2003,2004 Jonathan Blandford <jrb@alum.mit.edu>
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* Licensed under the Academic Free License version 2.0
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* Or under the following terms:
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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#include "xdgmimeint.h"
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#include "xdgmimeglob.h"
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#include "xdgmimemagic.h"
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#include "xdgmimealias.h"
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#include "xdgmimeparent.h"
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#include "xdgmimecache.h"
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#include <sys/types.h>
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typedef struct XdgDirTimeList XdgDirTimeList;
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typedef struct XdgCallbackList XdgCallbackList;
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static int need_reread = TRUE;
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static time_t last_stat_time = 0;
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static XdgGlobHash *global_hash = NULL;
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static XdgMimeMagic *global_magic = NULL;
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static XdgAliasList *alias_list = NULL;
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static XdgParentList *parent_list = NULL;
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static XdgDirTimeList *dir_time_list = NULL;
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static XdgCallbackList *callback_list = NULL;
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XdgMimeCache **_xdg_mime_caches = NULL;
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static int n_caches = 0;
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const char xdg_mime_type_unknown[] = "application/octet-stream";
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XDG_CHECKED_UNCHECKED,
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struct XdgCallbackList
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XdgCallbackList *next;
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XdgCallbackList *prev;
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XdgMimeCallback callback;
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XdgMimeDestroy destroy;
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/* Function called by xdg_run_command_on_dirs. If it returns TRUE, further
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* directories aren't looked at */
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typedef int (*XdgDirectoryFunc) (const char *directory,
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static XdgDirTimeList *
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xdg_dir_time_list_new (void)
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XdgDirTimeList *retval;
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retval = calloc (1, sizeof (XdgDirTimeList));
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retval->checked = XDG_CHECKED_UNCHECKED;
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xdg_dir_time_list_free (XdgDirTimeList *list)
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XdgDirTimeList *next;
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free (list->directory_name);
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xdg_mime_init_from_directory (const char *directory)
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XdgDirTimeList *list;
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assert (directory != NULL);
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file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
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if (stat (file_name, &st) == 0)
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XdgMimeCache *cache = _xdg_mime_cache_new_from_file (file_name);
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list = xdg_dir_time_list_new ();
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list->directory_name = file_name;
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list->mtime = st.st_mtime;
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list->next = dir_time_list;
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dir_time_list = list;
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_xdg_mime_caches = realloc (_xdg_mime_caches, sizeof (XdgMimeCache *) * (n_caches + 2));
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_xdg_mime_caches[n_caches] = cache;
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_xdg_mime_caches[n_caches + 1] = NULL;
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file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/globs");
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if (stat (file_name, &st) == 0)
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_xdg_mime_glob_read_from_file (global_hash, file_name);
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list = xdg_dir_time_list_new ();
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list->directory_name = file_name;
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list->mtime = st.st_mtime;
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list->next = dir_time_list;
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dir_time_list = list;
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file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/magic");
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if (stat (file_name, &st) == 0)
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_xdg_mime_magic_read_from_file (global_magic, file_name);
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list = xdg_dir_time_list_new ();
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list->directory_name = file_name;
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list->mtime = st.st_mtime;
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list->next = dir_time_list;
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dir_time_list = list;
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file_name = malloc (strlen (directory) + strlen ("/mime/aliases") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/aliases");
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_xdg_mime_alias_read_from_file (alias_list, file_name);
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file_name = malloc (strlen (directory) + strlen ("/mime/subclasses") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/subclasses");
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_xdg_mime_parent_read_from_file (parent_list, file_name);
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return FALSE; /* Keep processing */
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/* Runs a command on all the directories in the search path */
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xdg_run_command_on_dirs (XdgDirectoryFunc func,
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const char *xdg_data_home;
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const char *xdg_data_dirs;
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xdg_data_home = getenv ("XDG_DATA_HOME");
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if ((func) (xdg_data_home, user_data))
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home = getenv ("HOME");
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char *guessed_xdg_home;
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guessed_xdg_home = malloc (strlen (home) + strlen ("/.local/share/") + 1);
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strcpy (guessed_xdg_home, home);
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strcat (guessed_xdg_home, "/.local/share/");
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stop_processing = (func) (guessed_xdg_home, user_data);
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free (guessed_xdg_home);
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xdg_data_dirs = getenv ("XDG_DATA_DIRS");
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if (xdg_data_dirs == NULL)
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xdg_data_dirs = "/usr/local/share/:/usr/share/";
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while (*ptr != '\000')
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while (*end_ptr != ':' && *end_ptr != '\000')
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len = end_ptr - ptr + 1;
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dir = malloc (len + 1);
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strncpy (dir, ptr, len);
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stop_processing = (func) (dir, user_data);
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static XdgMimeCache *
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xdg_lookup_cache_for_file (const char *file_path)
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XdgDirTimeList *list;
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for (list = dir_time_list; list; list = list->next)
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if (! strcmp (list->directory_name, file_path))
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/* Checks file_path to make sure it has the same mtime as last time it was
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* checked. If it has a different mtime, or if the file doesn't exist, it
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* FIXME: This doesn't protect against permission changes.
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xdg_check_file (const char *file_path)
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/* If the file exists */
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if (stat (file_path, &st) == 0)
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XdgDirTimeList *list;
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for (list = dir_time_list; list; list = list->next)
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if (! strcmp (list->directory_name, file_path) &&
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st.st_mtime == list->mtime)
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if (list->checked == XDG_CHECKED_UNCHECKED)
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list->checked = XDG_CHECKED_VALID;
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else if (list->checked == XDG_CHECKED_VALID)
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list->checked = XDG_CHECKED_INVALID;
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return (list->checked != XDG_CHECKED_VALID);
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xdg_check_dir (const char *directory,
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int *invalid_dir_list)
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int invalid, has_cache;
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assert (directory != NULL);
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/* Check the mime.cache file */
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file_name = malloc (strlen (directory) + strlen ("/mime/mime.cache") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/mime.cache");
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invalid = xdg_check_file (file_name);
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has_cache = xdg_lookup_cache_for_file (file_name) != NULL;
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*invalid_dir_list = TRUE;
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/* Check the globs file */
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file_name = malloc (strlen (directory) + strlen ("/mime/globs") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/globs");
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invalid = xdg_check_file (file_name);
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*invalid_dir_list = TRUE;
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/* Check the magic file */
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file_name = malloc (strlen (directory) + strlen ("/mime/magic") + 1);
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strcpy (file_name, directory); strcat (file_name, "/mime/magic");
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invalid = xdg_check_file (file_name);
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*invalid_dir_list = TRUE;
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return FALSE; /* Keep processing */
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/* Walks through all the mime files stat()ing them to see if they've changed.
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* Returns TRUE if they have. */
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xdg_check_dirs (void)
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XdgDirTimeList *list;
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int invalid_dir_list = FALSE;
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for (list = dir_time_list; list; list = list->next)
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list->checked = XDG_CHECKED_UNCHECKED;
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xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_check_dir,
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if (invalid_dir_list)
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for (list = dir_time_list; list; list = list->next)
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if (list->checked != XDG_CHECKED_VALID)
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/* We want to avoid stat()ing on every single mime call, so we only look for
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* newer files every 5 seconds. This will return TRUE if we need to reread the
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* mime data from disk.
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xdg_check_time_and_dirs (void)
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gettimeofday (&tv, NULL);
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current_time = tv.tv_sec;
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if (current_time >= last_stat_time + 5)
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retval = xdg_check_dirs ();
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last_stat_time = current_time;
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/* Called in every public function. It reloads the hash function if need be.
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if (xdg_check_time_and_dirs ())
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xdg_mime_shutdown ();
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global_hash = _xdg_glob_hash_new ();
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global_magic = _xdg_mime_magic_new ();
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alias_list = _xdg_mime_alias_list_new ();
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parent_list = _xdg_mime_parent_list_new ();
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xdg_run_command_on_dirs ((XdgDirectoryFunc) xdg_mime_init_from_directory,
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xdg_mime_get_mime_type_for_data (const void *data,
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const char *mime_type;
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if (_xdg_mime_caches)
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return _xdg_mime_cache_get_mime_type_for_data (data, len);
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mime_type = _xdg_mime_magic_lookup_data (global_magic, data, len, NULL, 0);
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return XDG_MIME_TYPE_UNKNOWN;
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xdg_mime_get_mime_type_for_file (const char *file_name,
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struct stat *statbuf)
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const char *mime_type;
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/* Used to detect whether multiple MIME types match file_name */
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const char *mime_types[2];
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const char *base_name;
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if (file_name == NULL)
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if (! _xdg_utf8_validate (file_name))
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if (_xdg_mime_caches)
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return _xdg_mime_cache_get_mime_type_for_file (file_name, statbuf);
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base_name = _xdg_get_base_name (file_name);
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n = _xdg_glob_hash_lookup_file_name (global_hash, base_name, mime_types, 2);
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return mime_types[0];
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if (stat (file_name, &buf) != 0)
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return XDG_MIME_TYPE_UNKNOWN;
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if (!S_ISREG (statbuf->st_mode))
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return XDG_MIME_TYPE_UNKNOWN;
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/* FIXME: Need to make sure that max_extent isn't totally broken. This could
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* be large and need getting from a stream instead of just reading it all
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max_extent = _xdg_mime_magic_get_buffer_extents (global_magic);
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data = malloc (max_extent);
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return XDG_MIME_TYPE_UNKNOWN;
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file = fopen (file_name, "r");
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return XDG_MIME_TYPE_UNKNOWN;
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bytes_read = fread (data, 1, max_extent, file);
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return XDG_MIME_TYPE_UNKNOWN;
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mime_type = _xdg_mime_magic_lookup_data (global_magic, data, bytes_read,
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return XDG_MIME_TYPE_UNKNOWN;
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xdg_mime_get_mime_type_from_file_name (const char *file_name)
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const char *mime_types[2];
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if (_xdg_mime_caches)
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return _xdg_mime_cache_get_mime_type_from_file_name (file_name);
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if (_xdg_glob_hash_lookup_file_name (global_hash, file_name, mime_types, 2) == 1)
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return mime_types[0];
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return XDG_MIME_TYPE_UNKNOWN;
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xdg_mime_is_valid_mime_type (const char *mime_type)
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/* FIXME: We should make this a better test
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return _xdg_utf8_validate (mime_type);
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xdg_mime_shutdown (void)
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XdgCallbackList *list;
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/* FIXME: Need to make this (and the whole library) thread safe */
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xdg_dir_time_list_free (dir_time_list);
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dir_time_list = NULL;
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_xdg_glob_hash_free (global_hash);
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_xdg_mime_magic_free (global_magic);
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_xdg_mime_alias_list_free (alias_list);
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_xdg_mime_parent_list_free (parent_list);
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if (_xdg_mime_caches)
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for (i = 0; i < n_caches; i++)
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_xdg_mime_cache_unref (_xdg_mime_caches[i]);
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free (_xdg_mime_caches);
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_xdg_mime_caches = NULL;
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for (list = callback_list; list; list = list->next)
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(list->callback) (list->data);
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xdg_mime_get_max_buffer_extents (void)
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if (_xdg_mime_caches)
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return _xdg_mime_cache_get_max_buffer_extents ();
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return _xdg_mime_magic_get_buffer_extents (global_magic);
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_xdg_mime_unalias_mime_type (const char *mime_type)
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if (_xdg_mime_caches)
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return _xdg_mime_cache_unalias_mime_type (mime_type);
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if ((lookup = _xdg_mime_alias_list_lookup (alias_list, mime_type)) != NULL)
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xdg_mime_unalias_mime_type (const char *mime_type)
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return _xdg_mime_unalias_mime_type (mime_type);
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_xdg_mime_mime_type_equal (const char *mime_a,
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const char *unalias_a, *unalias_b;
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unalias_a = _xdg_mime_unalias_mime_type (mime_a);
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unalias_b = _xdg_mime_unalias_mime_type (mime_b);
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if (strcmp (unalias_a, unalias_b) == 0)
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xdg_mime_mime_type_equal (const char *mime_a,
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return _xdg_mime_mime_type_equal (mime_a, mime_b);
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_xdg_mime_media_type_equal (const char *mime_a,
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sep = strchr (mime_a, '/');
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if (sep && strncmp (mime_a, mime_b, sep - mime_a + 1) == 0)
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xdg_mime_media_type_equal (const char *mime_a,
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return _xdg_mime_media_type_equal (mime_a, mime_b);
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xdg_mime_is_super_type (const char *mime)
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length = strlen (mime);
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type = &(mime[length - 2]);
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if (strcmp (type, "/*") == 0)
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_xdg_mime_mime_type_subclass (const char *mime,
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const char *umime, *ubase;
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const char **parents;
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if (_xdg_mime_caches)
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return _xdg_mime_cache_mime_type_subclass (mime, base);
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umime = _xdg_mime_unalias_mime_type (mime);
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ubase = _xdg_mime_unalias_mime_type (base);
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if (strcmp (umime, ubase) == 0)
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/* Handle supertypes */
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if (xdg_mime_is_super_type (ubase) &&
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_xdg_mime_media_type_equal (umime, ubase))
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/* Handle special cases text/plain and application/octet-stream */
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if (strcmp (ubase, "text/plain") == 0 &&
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strncmp (umime, "text/", 5) == 0)
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if (strcmp (ubase, "application/octet-stream") == 0)
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parents = _xdg_mime_parent_list_lookup (parent_list, umime);
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for (; parents && *parents; parents++)
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if (_xdg_mime_mime_type_subclass (*parents, ubase))
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xdg_mime_mime_type_subclass (const char *mime,
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return _xdg_mime_mime_type_subclass (mime, base);
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xdg_mime_list_mime_parents (const char *mime)
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const char **parents;
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if (_xdg_mime_caches)
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return _xdg_mime_cache_list_mime_parents (mime);
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parents = xdg_mime_get_mime_parents (mime);
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for (i = 0; parents[i]; i++) ;
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n = (i + 1) * sizeof (char *);
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result = (char **) malloc (n);
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memcpy (result, parents, n);
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xdg_mime_get_mime_parents (const char *mime)
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umime = _xdg_mime_unalias_mime_type (mime);
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return _xdg_mime_parent_list_lookup (parent_list, umime);
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printf ("*** ALIASES ***\n\n");
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_xdg_mime_alias_list_dump (alias_list);
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printf ("\n*** PARENTS ***\n\n");
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_xdg_mime_parent_list_dump (parent_list);
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printf ("\n*** CACHE ***\n\n");
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_xdg_glob_hash_dump (global_hash);
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/* Registers a function to be called every time the mime database reloads its files
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xdg_mime_register_reload_callback (XdgMimeCallback callback,
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XdgMimeDestroy destroy)
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XdgCallbackList *list_el;
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static int callback_id = 1;
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/* Make a new list element */
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list_el = calloc (1, sizeof (XdgCallbackList));
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list_el->callback_id = callback_id;
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list_el->callback = callback;
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list_el->data = data;
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list_el->destroy = destroy;
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list_el->next = callback_list;
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list_el->next->prev = list_el;
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callback_list = list_el;
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return callback_id - 1;
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xdg_mime_remove_callback (int callback_id)
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XdgCallbackList *list;
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for (list = callback_list; list; list = list->next)
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if (list->callback_id == callback_id)
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list->next = list->prev;
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list->prev->next = list->next;
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callback_list = list->next;
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/* invoke the destroy handler */
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(list->destroy) (list->data);
added
removed
libgupnp/xdgmime/xdgmime.c
