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glib/gio/gcontenttype.c
Christian Hergert 18a33f72db introspection: use (nullable) or (optional) instead of (allow-none) 
If we have an input parameter (or return value) we need to use (nullable).
However, if it is an (inout) or (out) parameter, (optional) is sufficient.

It looks like (nullable) could be used for everything according to the
Annotation documentation, but (optional) is more specific.
2016-11-22 14:14:37 -08:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "gcontenttypeprivate.h"
#include "gthemedicon.h"
#include "gicon.h"
#include "gfile.h"
#include "gfileenumerator.h"
#include "gfileinfo.h"
#include "glibintl.h"
/**
* SECTION:gcontenttype
* @short_description: Platform-specific content typing
* @include: gio/gio.h
*
* A content type is a platform specific string that defines the type
* of a file. On UNIX it is a
* [mime type](http://www.wikipedia.org/wiki/Internet_media_type)
* like "text/plain" or "image/png".
* On Win32 it is an extension string like ".doc", ".txt" or a perceived
* string like "audio". Such strings can be looked up in the registry at
* HKEY_CLASSES_ROOT.
**/
#include <dirent.h>
#define XDG_PREFIX _gio_xdg
#include "xdgmime/xdgmime.h"
/* We lock this mutex whenever we modify global state in this module. */
G_LOCK_DEFINE_STATIC (gio_xdgmime);
gsize
_g_unix_content_type_get_sniff_len (void)
{
gsize size;
G_LOCK (gio_xdgmime);
size = xdg_mime_get_max_buffer_extents ();
G_UNLOCK (gio_xdgmime);
return size;
}
gchar *
_g_unix_content_type_unalias (const gchar *type)
{
gchar *res;
G_LOCK (gio_xdgmime);
res = g_strdup (xdg_mime_unalias_mime_type (type));
G_UNLOCK (gio_xdgmime);
return res;
}
gchar **
_g_unix_content_type_get_parents (const gchar *type)
{
const gchar *umime;
gchar **parents;
GPtrArray *array;
int i;
array = g_ptr_array_new ();
G_LOCK (gio_xdgmime);
umime = xdg_mime_unalias_mime_type (type);
g_ptr_array_add (array, g_strdup (umime));
parents = xdg_mime_list_mime_parents (umime);
for (i = 0; parents && parents[i] != NULL; i++)
g_ptr_array_add (array, g_strdup (parents[i]));
free (parents);
G_UNLOCK (gio_xdgmime);
g_ptr_array_add (array, NULL);
return (gchar **)g_ptr_array_free (array, FALSE);
}
/**
* g_content_type_equals:
* @type1: a content type string
* @type2: a content type string
*
* Compares two content types for equality.
*
* Returns: %TRUE if the two strings are identical or equivalent,
* %FALSE otherwise.
*/
gboolean
g_content_type_equals (const gchar *type1,
const gchar *type2)
{
gboolean res;
g_return_val_if_fail (type1 != NULL, FALSE);
g_return_val_if_fail (type2 != NULL, FALSE);
G_LOCK (gio_xdgmime);
res = xdg_mime_mime_type_equal (type1, type2);
G_UNLOCK (gio_xdgmime);
return res;
}
/**
* g_content_type_is_a:
* @type: a content type string
* @supertype: a content type string
*
* Determines if @type is a subset of @supertype.
*
* Returns: %TRUE if @type is a kind of @supertype,
* %FALSE otherwise.
*/
gboolean
g_content_type_is_a (const gchar *type,
const gchar *supertype)
{
gboolean res;
g_return_val_if_fail (type != NULL, FALSE);
g_return_val_if_fail (supertype != NULL, FALSE);
G_LOCK (gio_xdgmime);
res = xdg_mime_mime_type_subclass (type, supertype);
G_UNLOCK (gio_xdgmime);
return res;
}
/**
* g_content_type_is_unknown:
* @type: a content type string
*
* Checks if the content type is the generic "unknown" type.
* On UNIX this is the "application/octet-stream" mimetype,
* while on win32 it is "*".
*
* Returns: %TRUE if the type is the unknown type.
*/
gboolean
g_content_type_is_unknown (const gchar *type)
{
g_return_val_if_fail (type != NULL, FALSE);
return strcmp (XDG_MIME_TYPE_UNKNOWN, type) == 0;
}
typedef enum {
MIME_TAG_TYPE_OTHER,
MIME_TAG_TYPE_COMMENT
} MimeTagType;
typedef struct {
int current_type;
int current_lang_level;
int comment_lang_level;
char *comment;
} MimeParser;
static int
language_level (const char *lang)
{
const char * const *lang_list;
int i;
/* The returned list is sorted from most desirable to least
desirable and always contains the default locale "C". */
lang_list = g_get_language_names ();
for (i = 0; lang_list[i]; i++)
if (strcmp (lang_list[i], lang) == 0)
return 1000-i;
return 0;
}
static void
mime_info_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error)
{
int i;
const char *lang;
MimeParser *parser = user_data;
if (strcmp (element_name, "comment") == 0)
{
lang = "C";
for (i = 0; attribute_names[i]; i++)
if (strcmp (attribute_names[i], "xml:lang") == 0)
{
lang = attribute_values[i];
break;
}
parser->current_lang_level = language_level (lang);
parser->current_type = MIME_TAG_TYPE_COMMENT;
}
else
parser->current_type = MIME_TAG_TYPE_OTHER;
}
static void
mime_info_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error)
{
MimeParser *parser = user_data;
parser->current_type = MIME_TAG_TYPE_OTHER;
}
static void
mime_info_text (GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error)
{
MimeParser *parser = user_data;
if (parser->current_type == MIME_TAG_TYPE_COMMENT &&
parser->current_lang_level > parser->comment_lang_level)
{
g_free (parser->comment);
parser->comment = g_strndup (text, text_len);
parser->comment_lang_level = parser->current_lang_level;
}
}
static char *
load_comment_for_mime_helper (const char *dir,
const char *basename)
{
GMarkupParseContext *context;
char *filename, *data;
gsize len;
gboolean res;
MimeParser parse_data = {0};
GMarkupParser parser = {
mime_info_start_element,
mime_info_end_element,
mime_info_text
};
filename = g_build_filename (dir, "mime", basename, NULL);
res = g_file_get_contents (filename, &data, &len, NULL);
g_free (filename);
if (!res)
return NULL;
context = g_markup_parse_context_new (&parser, 0, &parse_data, NULL);
res = g_markup_parse_context_parse (context, data, len, NULL);
g_free (data);
g_markup_parse_context_free (context);
if (!res)
return NULL;
return parse_data.comment;
}
static char *
load_comment_for_mime (const char *mimetype)
{
const char * const* dirs;
char *basename;
char *comment;
int i;
basename = g_strdup_printf ("%s.xml", mimetype);
comment = load_comment_for_mime_helper (g_get_user_data_dir (), basename);
if (comment)
{
g_free (basename);
return comment;
}
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i] != NULL; i++)
{
comment = load_comment_for_mime_helper (dirs[i], basename);
if (comment)
{
g_free (basename);
return comment;
}
}
g_free (basename);
return g_strdup_printf (_("%s type"), mimetype);
}
/**
* g_content_type_get_description:
* @type: a content type string
*
* Gets the human readable description of the content type.
*
* Returns: a short description of the content type @type. Free the
* returned string with g_free()
*/
gchar *
g_content_type_get_description (const gchar *type)
{
static GHashTable *type_comment_cache = NULL;
gchar *comment;
g_return_val_if_fail (type != NULL, NULL);
G_LOCK (gio_xdgmime);
type = xdg_mime_unalias_mime_type (type);
if (type_comment_cache == NULL)
type_comment_cache = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
comment = g_hash_table_lookup (type_comment_cache, type);
comment = g_strdup (comment);
G_UNLOCK (gio_xdgmime);
if (comment != NULL)
return comment;
comment = load_comment_for_mime (type);
G_LOCK (gio_xdgmime);
g_hash_table_insert (type_comment_cache,
g_strdup (type),
g_strdup (comment));
G_UNLOCK (gio_xdgmime);
return comment;
}
/**
* g_content_type_get_mime_type:
* @type: a content type string
*
* Gets the mime type for the content type, if one is registered.
*
* Returns: (nullable): the registered mime type for the given @type,
* or %NULL if unknown.
*/
char *
g_content_type_get_mime_type (const char *type)
{
g_return_val_if_fail (type != NULL, NULL);
return g_strdup (type);
}
static GIcon *
g_content_type_get_icon_internal (const gchar *type,
gboolean symbolic)
{
char *mimetype_icon;
char *generic_mimetype_icon = NULL;
char *q;
char *icon_names[6];
int n = 0;
GIcon *themed_icon;
const char *xdg_icon;
int i;
g_return_val_if_fail (type != NULL, NULL);
G_LOCK (gio_xdgmime);
xdg_icon = xdg_mime_get_icon (type);
G_UNLOCK (gio_xdgmime);
if (xdg_icon)
icon_names[n++] = g_strdup (xdg_icon);
mimetype_icon = g_strdup (type);
while ((q = strchr (mimetype_icon, '/')) != NULL)
*q = '-';
icon_names[n++] = mimetype_icon;
generic_mimetype_icon = g_content_type_get_generic_icon_name (type);
if (generic_mimetype_icon)
icon_names[n++] = generic_mimetype_icon;
if (symbolic)
{
for (i = 0; i < n; i++)
{
icon_names[n + i] = icon_names[i];
icon_names[i] = g_strconcat (icon_names[i], "-symbolic", NULL);
}
n += n;
}
themed_icon = g_themed_icon_new_from_names (icon_names, n);
for (i = 0; i < n; i++)
g_free (icon_names[i]);
return themed_icon;
}
/**
* g_content_type_get_icon:
* @type: a content type string
*
* Gets the icon for a content type.
*
* Returns: (transfer full): #GIcon corresponding to the content type. Free the returned
* object with g_object_unref()
*/
GIcon *
g_content_type_get_icon (const gchar *type)
{
return g_content_type_get_icon_internal (type, FALSE);
}
/**
* g_content_type_get_symbolic_icon:
* @type: a content type string
*
* Gets the symbolic icon for a content type.
*
* Returns: (transfer full): symbolic #GIcon corresponding to the content type.
* Free the returned object with g_object_unref()
*
* Since: 2.34
*/
GIcon *
g_content_type_get_symbolic_icon (const gchar *type)
{
return g_content_type_get_icon_internal (type, TRUE);
}
/**
* g_content_type_get_generic_icon_name:
* @type: a content type string
*
* Gets the generic icon name for a content type.
*
* See the
* [shared-mime-info](http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec)
* specification for more on the generic icon name.
*
* Returns: (nullable): the registered generic icon name for the given @type,
* or %NULL if unknown. Free with g_free()
*
* Since: 2.34
*/
gchar *
g_content_type_get_generic_icon_name (const gchar *type)
{
const gchar *xdg_icon_name;
gchar *icon_name;
G_LOCK (gio_xdgmime);
xdg_icon_name = xdg_mime_get_generic_icon (type);
G_UNLOCK (gio_xdgmime);
if (!xdg_icon_name)
{
const char *p;
const char *suffix = "-x-generic";
p = strchr (type, '/');
if (p == NULL)
p = type + strlen (type);
icon_name = g_malloc (p - type + strlen (suffix) + 1);
memcpy (icon_name, type, p - type);
memcpy (icon_name + (p - type), suffix, strlen (suffix));
icon_name[(p - type) + strlen (suffix)] = 0;
}
else
{
icon_name = g_strdup (xdg_icon_name);
}
return icon_name;
}
/**
* g_content_type_can_be_executable:
* @type: a content type string
*
* Checks if a content type can be executable. Note that for instance
* things like text files can be executables (i.e. scripts and batch files).
*
* Returns: %TRUE if the file type corresponds to a type that
* can be executable, %FALSE otherwise.
*/
gboolean
g_content_type_can_be_executable (const gchar *type)
{
g_return_val_if_fail (type != NULL, FALSE);
if (g_content_type_is_a (type, "application/x-executable") ||
g_content_type_is_a (type, "text/plain"))
return TRUE;
return FALSE;
}
static gboolean
looks_like_text (const guchar *data, gsize data_size)
{
gsize i;
char c;
for (i = 0; i < data_size; i++)
{
c = data[i];
if (g_ascii_iscntrl (c) &&
!g_ascii_isspace (c) &&
c != '\b')
return FALSE;
}
return TRUE;
}
/**
* g_content_type_from_mime_type:
* @mime_type: a mime type string
*
* Tries to find a content type based on the mime type name.
*
* Returns: (nullable): Newly allocated string with content type or
* %NULL. Free with g_free()
*
* Since: 2.18
**/
gchar *
g_content_type_from_mime_type (const gchar *mime_type)
{
char *umime;
g_return_val_if_fail (mime_type != NULL, NULL);
G_LOCK (gio_xdgmime);
/* mime type and content type are same on unixes */
umime = g_strdup (xdg_mime_unalias_mime_type (mime_type));
G_UNLOCK (gio_xdgmime);
return umime;
}
/**
* g_content_type_guess:
* @filename: (nullable): a string, or %NULL
* @data: (nullable) (array length=data_size): a stream of data, or %NULL
* @data_size: the size of @data
* @result_uncertain: (out) (optional): return location for the certainty
* of the result, or %NULL
*
* Guesses the content type based on example data. If the function is
* uncertain, @result_uncertain will be set to %TRUE. Either @filename
* or @data may be %NULL, in which case the guess will be based solely
* on the other argument.
*
* Returns: a string indicating a guessed content type for the
* given data. Free with g_free()
*/
gchar *
g_content_type_guess (const gchar *filename,
const guchar *data,
gsize data_size,
gboolean *result_uncertain)
{
char *basename;
const char *name_mimetypes[10], *sniffed_mimetype;
char *mimetype;
int i;
int n_name_mimetypes;
int sniffed_prio;
sniffed_prio = 0;
n_name_mimetypes = 0;
sniffed_mimetype = XDG_MIME_TYPE_UNKNOWN;
if (result_uncertain)
*result_uncertain = FALSE;
/* our test suite and potentially other code used -1 in the past, which is
* not documented and not allowed; guard against that */
g_return_val_if_fail (data_size != (gsize) -1, g_strdup (XDG_MIME_TYPE_UNKNOWN));
G_LOCK (gio_xdgmime);
if (filename)
{
i = strlen (filename);
if (filename[i - 1] == '/')
{
name_mimetypes[0] = "inode/directory";
name_mimetypes[1] = NULL;
n_name_mimetypes = 1;
if (result_uncertain)
*result_uncertain = TRUE;
}
else
{
basename = g_path_get_basename (filename);
n_name_mimetypes = xdg_mime_get_mime_types_from_file_name (basename, name_mimetypes, 10);
g_free (basename);
}
}
/* Got an extension match, and no conflicts. This is it. */
if (n_name_mimetypes == 1)
{
gchar *s = g_strdup (name_mimetypes[0]);
G_UNLOCK (gio_xdgmime);
return s;
}
if (data)
{
sniffed_mimetype = xdg_mime_get_mime_type_for_data (data, data_size, &sniffed_prio);
if (sniffed_mimetype == XDG_MIME_TYPE_UNKNOWN &&
data &&
looks_like_text (data, data_size))
sniffed_mimetype = "text/plain";
/* For security reasons we don't ever want to sniff desktop files
* where we know the filename and it doesn't have a .desktop extension.
* This is because desktop files allow executing any application and
* we don't want to make it possible to hide them looking like something
* else.
*/
if (filename != NULL &&
strcmp (sniffed_mimetype, "application/x-desktop") == 0)
sniffed_mimetype = "text/plain";
}
if (n_name_mimetypes == 0)
{
if (sniffed_mimetype == XDG_MIME_TYPE_UNKNOWN &&
result_uncertain)
*result_uncertain = TRUE;
mimetype = g_strdup (sniffed_mimetype);
}
else
{
mimetype = NULL;
if (sniffed_mimetype != XDG_MIME_TYPE_UNKNOWN)
{
if (sniffed_prio >= 80) /* High priority sniffing match, use that */
mimetype = g_strdup (sniffed_mimetype);
else
{
/* There are conflicts between the name matches and we
* have a sniffed type, use that as a tie breaker.
*/
for (i = 0; i < n_name_mimetypes; i++)
{
if ( xdg_mime_mime_type_subclass (name_mimetypes[i], sniffed_mimetype))
{
/* This nametype match is derived from (or the same as)
* the sniffed type). This is probably it.
*/
mimetype = g_strdup (name_mimetypes[i]);
break;
}
}
}
}
if (mimetype == NULL)
{
/* Conflicts, and sniffed type was no help or not there.
* Guess on the first one
*/
mimetype = g_strdup (name_mimetypes[0]);
if (result_uncertain)
*result_uncertain = TRUE;
}
}
G_UNLOCK (gio_xdgmime);
return mimetype;
}
static void
enumerate_mimetypes_subdir (const char *dir,
const char *prefix,
GHashTable *mimetypes)
{
DIR *d;
struct dirent *ent;
char *mimetype;
d = opendir (dir);
if (d)
{
while ((ent = readdir (d)) != NULL)
{
if (g_str_has_suffix (ent->d_name, ".xml"))
{
mimetype = g_strdup_printf ("%s/%.*s", prefix, (int) strlen (ent->d_name) - 4, ent->d_name);
g_hash_table_replace (mimetypes, mimetype, NULL);
}
}
closedir (d);
}
}
static void
enumerate_mimetypes_dir (const char *dir,
GHashTable *mimetypes)
{
DIR *d;
struct dirent *ent;
char *mimedir;
char *name;
mimedir = g_build_filename (dir, "mime", NULL);
d = opendir (mimedir);
if (d)
{
while ((ent = readdir (d)) != NULL)
{
if (strcmp (ent->d_name, "packages") != 0)
{
name = g_build_filename (mimedir, ent->d_name, NULL);
if (g_file_test (name, G_FILE_TEST_IS_DIR))
enumerate_mimetypes_subdir (name, ent->d_name, mimetypes);
g_free (name);
}
}
closedir (d);
}
g_free (mimedir);
}
/**
* g_content_types_get_registered:
*
* Gets a list of strings containing all the registered content types
* known to the system. The list and its data should be freed using
* g_list_free_full (list, g_free).
*
* Returns: (element-type utf8) (transfer full): list of the registered
* content types
*/
GList *
g_content_types_get_registered (void)
{
const char * const* dirs;
GHashTable *mimetypes;
GHashTableIter iter;
gpointer key;
int i;
GList *l;
mimetypes = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
enumerate_mimetypes_dir (g_get_user_data_dir (), mimetypes);
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i] != NULL; i++)
enumerate_mimetypes_dir (dirs[i], mimetypes);
l = NULL;
g_hash_table_iter_init (&iter, mimetypes);
while (g_hash_table_iter_next (&iter, &key, NULL))
{
l = g_list_prepend (l, key);
g_hash_table_iter_steal (&iter);
}
g_hash_table_destroy (mimetypes);
return l;
}
/* tree magic data */
static GList *tree_matches = NULL;
static gboolean need_reload = FALSE;
G_LOCK_DEFINE_STATIC (gio_treemagic);
typedef struct
{
gchar *path;
GFileType type;
guint match_case : 1;
guint executable : 1;
guint non_empty : 1;
guint on_disc : 1;
gchar *mimetype;
GList *matches;
} TreeMatchlet;
typedef struct
{
gchar *contenttype;
gint priority;
GList *matches;
} TreeMatch;
static void
tree_matchlet_free (TreeMatchlet *matchlet)
{
g_list_free_full (matchlet->matches, (GDestroyNotify) tree_matchlet_free);
g_free (matchlet->path);
g_free (matchlet->mimetype);
g_slice_free (TreeMatchlet, matchlet);
}
static void
tree_match_free (TreeMatch *match)
{
g_list_free_full (match->matches, (GDestroyNotify) tree_matchlet_free);
g_free (match->contenttype);
g_slice_free (TreeMatch, match);
}
static TreeMatch *
parse_header (gchar *line)
{
gint len;
gchar *s;
TreeMatch *match;
len = strlen (line);
if (line[0] != '[' || line[len - 1] != ']')
return NULL;
line[len - 1] = 0;
s = strchr (line, ':');
match = g_slice_new0 (TreeMatch);
match->priority = atoi (line + 1);
match->contenttype = g_strdup (s + 1);
return match;
}
static TreeMatchlet *
parse_match_line (gchar *line,
gint *depth)
{
gchar *s, *p;
TreeMatchlet *matchlet;
gchar **parts;
gint i;
matchlet = g_slice_new0 (TreeMatchlet);
if (line[0] == '>')
{
*depth = 0;
s = line;
}
else
{
*depth = atoi (line);
s = strchr (line, '>');
}
s += 2;
p = strchr (s, '"');
*p = 0;
matchlet->path = g_strdup (s);
s = p + 1;
parts = g_strsplit (s, ",", 0);
if (strcmp (parts[0], "=file") == 0)
matchlet->type = G_FILE_TYPE_REGULAR;
else if (strcmp (parts[0], "=directory") == 0)
matchlet->type = G_FILE_TYPE_DIRECTORY;
else if (strcmp (parts[0], "=link") == 0)
matchlet->type = G_FILE_TYPE_SYMBOLIC_LINK;
else
matchlet->type = G_FILE_TYPE_UNKNOWN;
for (i = 1; parts[i]; i++)
{
if (strcmp (parts[i], "executable") == 0)
matchlet->executable = 1;
else if (strcmp (parts[i], "match-case") == 0)
matchlet->match_case = 1;
else if (strcmp (parts[i], "non-empty") == 0)
matchlet->non_empty = 1;
else if (strcmp (parts[i], "on-disc") == 0)
matchlet->on_disc = 1;
else
matchlet->mimetype = g_strdup (parts[i]);
}
g_strfreev (parts);
return matchlet;
}
static gint
cmp_match (gconstpointer a, gconstpointer b)
{
const TreeMatch *aa = (const TreeMatch *)a;
const TreeMatch *bb = (const TreeMatch *)b;
return bb->priority - aa->priority;
}
static void
insert_match (TreeMatch *match)
{
tree_matches = g_list_insert_sorted (tree_matches, match, cmp_match);
}
static void
insert_matchlet (TreeMatch *match,
TreeMatchlet *matchlet,
gint depth)
{
if (depth == 0)
match->matches = g_list_append (match->matches, matchlet);
else
{
GList *last;
TreeMatchlet *m;
last = g_list_last (match->matches);
if (!last)
{
tree_matchlet_free (matchlet);
g_warning ("can't insert tree matchlet at depth %d", depth);
return;
}
m = (TreeMatchlet *) last->data;
while (--depth > 0)
{
last = g_list_last (m->matches);
if (!last)
{
tree_matchlet_free (matchlet);
g_warning ("can't insert tree matchlet at depth %d", depth);
return;
}
m = (TreeMatchlet *) last->data;
}
m->matches = g_list_append (m->matches, matchlet);
}
}
static void
read_tree_magic_from_directory (const gchar *prefix)
{
gchar *filename;
gchar *text;
gsize len;
gchar **lines;
gint i;
TreeMatch *match;
TreeMatchlet *matchlet;
gint depth;
filename = g_build_filename (prefix, "mime", "treemagic", NULL);
if (g_file_get_contents (filename, &text, &len, NULL))
{
if (strcmp (text, "MIME-TreeMagic") == 0)
{
lines = g_strsplit (text + strlen ("MIME-TreeMagic") + 2, "\n", 0);
match = NULL;
for (i = 0; lines[i] && lines[i][0]; i++)
{
if (lines[i][0] == '[')
{
match = parse_header (lines[i]);
insert_match (match);
}
else if (match != NULL)
{
matchlet = parse_match_line (lines[i], &depth);
insert_matchlet (match, matchlet, depth);
}
else
{
g_warning ("%s: header corrupt; skipping\n", filename);
break;
}
}
g_strfreev (lines);
}
else
g_warning ("%s: header not found, skipping\n", filename);
g_free (text);
}
g_free (filename);
}
static void
xdg_mime_reload (void *user_data)
{
need_reload = TRUE;
}
static void
tree_magic_shutdown (void)
{
g_list_free_full (tree_matches, (GDestroyNotify) tree_match_free);
tree_matches = NULL;
}
static void
tree_magic_init (void)
{
static gboolean initialized = FALSE;
const gchar *dir;
const gchar * const * dirs;
int i;
if (!initialized)
{
initialized = TRUE;
xdg_mime_register_reload_callback (xdg_mime_reload, NULL, NULL);
need_reload = TRUE;
}
if (need_reload)
{
need_reload = FALSE;
tree_magic_shutdown ();
dir = g_get_user_data_dir ();
read_tree_magic_from_directory (dir);
dirs = g_get_system_data_dirs ();
for (i = 0; dirs[i]; i++)
read_tree_magic_from_directory (dirs[i]);
}
}
/* a filtering enumerator */
typedef struct
{
gchar *path;
gint depth;
gboolean ignore_case;
gchar **components;
gchar **case_components;
GFileEnumerator **enumerators;
GFile **children;
} Enumerator;
static gboolean
component_match (Enumerator *e,
gint depth,
const gchar *name)
{
gchar *case_folded, *key;
gboolean found;
if (strcmp (name, e->components[depth]) == 0)
return TRUE;
if (!e->ignore_case)
return FALSE;
case_folded = g_utf8_casefold (name, -1);
key = g_utf8_collate_key (case_folded, -1);
found = strcmp (key, e->case_components[depth]) == 0;
g_free (case_folded);
g_free (key);
return found;
}
static GFile *
next_match_recurse (Enumerator *e,
gint depth)
{
GFile *file;
GFileInfo *info;
const gchar *name;
while (TRUE)
{
if (e->enumerators[depth] == NULL)
{
if (depth > 0)
{
file = next_match_recurse (e, depth - 1);
if (file)
{
e->children[depth] = file;
e->enumerators[depth] = g_file_enumerate_children (file,
G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL,
NULL);
}
}
if (e->enumerators[depth] == NULL)
return NULL;
}
while ((info = g_file_enumerator_next_file (e->enumerators[depth], NULL, NULL)))
{
name = g_file_info_get_name (info);
if (component_match (e, depth, name))
{
file = g_file_get_child (e->children[depth], name);
g_object_unref (info);
return file;
}
g_object_unref (info);
}
g_object_unref (e->enumerators[depth]);
e->enumerators[depth] = NULL;
g_object_unref (e->children[depth]);
e->children[depth] = NULL;
}
}
static GFile *
enumerator_next (Enumerator *e)
{
return next_match_recurse (e, e->depth - 1);
}
static Enumerator *
enumerator_new (GFile *root,
const char *path,
gboolean ignore_case)
{
Enumerator *e;
gint i;
gchar *case_folded;
e = g_new0 (Enumerator, 1);
e->path = g_strdup (path);
e->ignore_case = ignore_case;
e->components = g_strsplit (e->path, G_DIR_SEPARATOR_S, -1);
e->depth = g_strv_length (e->components);
if (e->ignore_case)
{
e->case_components = g_new0 (char *, e->depth + 1);
for (i = 0; e->components[i]; i++)
{
case_folded = g_utf8_casefold (e->components[i], -1);
e->case_components[i] = g_utf8_collate_key (case_folded, -1);
g_free (case_folded);
}
}
e->children = g_new0 (GFile *, e->depth);
e->children[0] = g_object_ref (root);
e->enumerators = g_new0 (GFileEnumerator *, e->depth);
e->enumerators[0] = g_file_enumerate_children (root,
G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL,
NULL);
return e;
}
static void
enumerator_free (Enumerator *e)
{
gint i;
for (i = 0; i < e->depth; i++)
{
if (e->enumerators[i])
g_object_unref (e->enumerators[i]);
if (e->children[i])
g_object_unref (e->children[i]);
}
g_free (e->enumerators);
g_free (e->children);
g_strfreev (e->components);
if (e->case_components)
g_strfreev (e->case_components);
g_free (e->path);
g_free (e);
}
static gboolean
matchlet_match (TreeMatchlet *matchlet,
GFile *root)
{
GFile *file;
GFileInfo *info;
gboolean result;
const gchar *attrs;
Enumerator *e;
GList *l;
e = enumerator_new (root, matchlet->path, !matchlet->match_case);
do
{
file = enumerator_next (e);
if (!file)
{
enumerator_free (e);
return FALSE;
}
if (matchlet->mimetype)
attrs = G_FILE_ATTRIBUTE_STANDARD_TYPE ","
G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE ","
G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE;
else
attrs = G_FILE_ATTRIBUTE_STANDARD_TYPE ","
G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE;
info = g_file_query_info (file,
attrs,
G_FILE_QUERY_INFO_NONE,
NULL,
NULL);
if (info)
{
result = TRUE;
if (matchlet->type != G_FILE_TYPE_UNKNOWN &&
g_file_info_get_file_type (info) != matchlet->type)
result = FALSE;
if (matchlet->executable &&
!g_file_info_get_attribute_boolean (info, G_FILE_ATTRIBUTE_ACCESS_CAN_EXECUTE))
result = FALSE;
}
else
result = FALSE;
if (result && matchlet->non_empty)
{
GFileEnumerator *child_enum;
GFileInfo *child_info;
child_enum = g_file_enumerate_children (file,
G_FILE_ATTRIBUTE_STANDARD_NAME,
G_FILE_QUERY_INFO_NONE,
NULL,
NULL);
if (child_enum)
{
child_info = g_file_enumerator_next_file (child_enum, NULL, NULL);
if (child_info)
g_object_unref (child_info);
else
result = FALSE;
g_object_unref (child_enum);
}
else
result = FALSE;
}
if (result && matchlet->mimetype)
{
if (strcmp (matchlet->mimetype, g_file_info_get_content_type (info)) != 0)
result = FALSE;
}
if (info)
g_object_unref (info);
g_object_unref (file);
}
while (!result);
enumerator_free (e);
if (!matchlet->matches)
return TRUE;
for (l = matchlet->matches; l; l = l->next)
{
TreeMatchlet *submatchlet;
submatchlet = l->data;
if (matchlet_match (submatchlet, root))
return TRUE;
}
return FALSE;
}
static void
match_match (TreeMatch *match,
GFile *root,
GPtrArray *types)
{
GList *l;
for (l = match->matches; l; l = l->next)
{
TreeMatchlet *matchlet = l->data;
if (matchlet_match (matchlet, root))
{
g_ptr_array_add (types, g_strdup (match->contenttype));
break;
}
}
}
/**
* g_content_type_guess_for_tree:
* @root: the root of the tree to guess a type for
*
* Tries to guess the type of the tree with root @root, by
* looking at the files it contains. The result is an array
* of content types, with the best guess coming first.
*
* The types returned all have the form x-content/foo, e.g.
* x-content/audio-cdda (for audio CDs) or x-content/image-dcf
* (for a camera memory card). See the
* [shared-mime-info](http://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec)
* specification for more on x-content types.
*
* This function is useful in the implementation of
* g_mount_guess_content_type().
*
* Returns: (transfer full) (array zero-terminated=1): an %NULL-terminated
* array of zero or more content types. Free with g_strfreev()
*
* Since: 2.18
*/
gchar **
g_content_type_guess_for_tree (GFile *root)
{
GPtrArray *types;
GList *l;
types = g_ptr_array_new ();
G_LOCK (gio_treemagic);
tree_magic_init ();
for (l = tree_matches; l; l = l->next)
{
TreeMatch *match = l->data;
match_match (match, root, types);
}
G_UNLOCK (gio_treemagic);
g_ptr_array_add (types, NULL);
return (gchar **)g_ptr_array_free (types, FALSE);
}
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