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glib/gio/gcontenttype.c
Philip Withnall 6775fe2555 docs: Add (transfer full) annotation to g_content_type_get_mime_type() 
Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/glib/issues/811
2018-06-08 14:05:40 +01:00

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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 2.1 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.
* On OSX it is a [Uniform Type Identifier](https://en.wikipedia.org/wiki/Uniform_Type_Identifier)
* such as "com.apple.application".
**/
#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_mime_type:
* @type: a content type string
* @mime_type: a mime type string
*
* Determines if @type is a subset of @mime_type.
* Convenience wrapper around g_content_type_is_a().
*
* Returns: %TRUE if @type is a kind of @mime_type,
* %FALSE otherwise.
*
* Since: 2.52
*/
gboolean
g_content_type_is_mime_type (const gchar *type,
const gchar *mime_type)
{
return g_content_type_is_a (type, mime_type);
}
/**
* 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 "*" and on OSX it is a dynamic type
* or octet-stream.
*
* 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) (transfer full): the registered mime type for the
* given @type, or %NULL if unknown; free with g_free().
*/
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", filename);
break;
}
}
g_strfreev (lines);
}
else
g_warning ("%s: header not found, skipping", 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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