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glib/gio/gdbusutils.c
Philip Withnall 5a8b02cae6 gdbusutils: Add an example to g_dbus_gvariant_to_gvalue() docs 
Clarify that GVariants of type v are not magically unboxed.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://bugzilla.gnome.org/show_bug.cgi?id=784433
2017-07-04 10:45:50 +01:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 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: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "gdbusutils.h"
#include "glibintl.h"
/**
* SECTION:gdbusutils
* @title: D-Bus Utilities
* @short_description: Various utilities related to D-Bus
* @include: gio/gio.h
*
* Various utility routines related to D-Bus.
*/
static gboolean
is_valid_bus_name_character (gint c,
gboolean allow_hyphen)
{
return
(c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c == '_') ||
(allow_hyphen && c == '-');
}
static gboolean
is_valid_initial_bus_name_character (gint c,
gboolean allow_initial_digit,
gboolean allow_hyphen)
{
if (allow_initial_digit)
return is_valid_bus_name_character (c, allow_hyphen);
else
return
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c == '_') ||
(allow_hyphen && c == '-');
}
static gboolean
is_valid_name (const gchar *start,
guint len,
gboolean allow_initial_digit,
gboolean allow_hyphen)
{
gboolean ret;
const gchar *s;
const gchar *end;
gboolean has_dot;
ret = FALSE;
if (len == 0)
goto out;
s = start;
end = s + len;
has_dot = FALSE;
while (s != end)
{
if (*s == '.')
{
s += 1;
if (G_UNLIKELY (!is_valid_initial_bus_name_character (*s, allow_initial_digit, allow_hyphen)))
goto out;
has_dot = TRUE;
}
else if (G_UNLIKELY (!is_valid_bus_name_character (*s, allow_hyphen)))
{
goto out;
}
s += 1;
}
if (G_UNLIKELY (!has_dot))
goto out;
ret = TRUE;
out:
return ret;
}
/**
* g_dbus_is_name:
* @string: The string to check.
*
* Checks if @string is a valid D-Bus bus name (either unique or well-known).
*
* Returns: %TRUE if valid, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_is_name (const gchar *string)
{
guint len;
gboolean ret;
const gchar *s;
g_return_val_if_fail (string != NULL, FALSE);
ret = FALSE;
len = strlen (string);
if (G_UNLIKELY (len == 0 || len > 255))
goto out;
s = string;
if (*s == ':')
{
/* handle unique name */
if (!is_valid_name (s + 1, len - 1, TRUE, TRUE))
goto out;
ret = TRUE;
goto out;
}
else if (G_UNLIKELY (*s == '.'))
{
/* can't start with a . */
goto out;
}
else if (G_UNLIKELY (!is_valid_initial_bus_name_character (*s, FALSE, TRUE)))
goto out;
ret = is_valid_name (s + 1, len - 1, FALSE, TRUE);
out:
return ret;
}
/**
* g_dbus_is_unique_name:
* @string: The string to check.
*
* Checks if @string is a valid D-Bus unique bus name.
*
* Returns: %TRUE if valid, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_is_unique_name (const gchar *string)
{
gboolean ret;
guint len;
g_return_val_if_fail (string != NULL, FALSE);
ret = FALSE;
len = strlen (string);
if (G_UNLIKELY (len == 0 || len > 255))
goto out;
if (G_UNLIKELY (*string != ':'))
goto out;
if (G_UNLIKELY (!is_valid_name (string + 1, len - 1, TRUE, TRUE)))
goto out;
ret = TRUE;
out:
return ret;
}
/**
* g_dbus_is_member_name:
* @string: The string to check.
*
* Checks if @string is a valid D-Bus member (e.g. signal or method) name.
*
* Returns: %TRUE if valid, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_is_member_name (const gchar *string)
{
gboolean ret;
guint n;
ret = FALSE;
if (G_UNLIKELY (string == NULL))
goto out;
if (G_UNLIKELY (!is_valid_initial_bus_name_character (string[0], FALSE, FALSE)))
goto out;
for (n = 1; string[n] != '\0'; n++)
{
if (G_UNLIKELY (!is_valid_bus_name_character (string[n], FALSE)))
{
goto out;
}
}
ret = TRUE;
out:
return ret;
}
/**
* g_dbus_is_interface_name:
* @string: The string to check.
*
* Checks if @string is a valid D-Bus interface name.
*
* Returns: %TRUE if valid, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_is_interface_name (const gchar *string)
{
guint len;
gboolean ret;
const gchar *s;
g_return_val_if_fail (string != NULL, FALSE);
ret = FALSE;
len = strlen (string);
if (G_UNLIKELY (len == 0 || len > 255))
goto out;
s = string;
if (G_UNLIKELY (*s == '.'))
{
/* can't start with a . */
goto out;
}
else if (G_UNLIKELY (!is_valid_initial_bus_name_character (*s, FALSE, FALSE)))
goto out;
ret = is_valid_name (s + 1, len - 1, FALSE, FALSE);
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/* TODO: maybe move to glib? if so, it should conform to http://en.wikipedia.org/wiki/Guid and/or
* http://tools.ietf.org/html/rfc4122 - specifically it should have hyphens then.
*/
/**
* g_dbus_generate_guid:
*
* Generate a D-Bus GUID that can be used with
* e.g. g_dbus_connection_new().
*
* See the D-Bus specification regarding what strings are valid D-Bus
* GUID (for example, D-Bus GUIDs are not RFC-4122 compliant).
*
* Returns: A valid D-Bus GUID. Free with g_free().
*
* Since: 2.26
*/
gchar *
g_dbus_generate_guid (void)
{
GString *s;
GTimeVal now;
guint32 r1;
guint32 r2;
guint32 r3;
s = g_string_new (NULL);
r1 = g_random_int ();
r2 = g_random_int ();
r3 = g_random_int ();
g_get_current_time (&now);
g_string_append_printf (s, "%08x", r1);
g_string_append_printf (s, "%08x", r2);
g_string_append_printf (s, "%08x", r3);
g_string_append_printf (s, "%08x", (guint32) now.tv_sec);
return g_string_free (s, FALSE);
}
/**
* g_dbus_is_guid:
* @string: The string to check.
*
* Checks if @string is a D-Bus GUID.
*
* See the D-Bus specification regarding what strings are valid D-Bus
* GUID (for example, D-Bus GUIDs are not RFC-4122 compliant).
*
* Returns: %TRUE if @string is a guid, %FALSE otherwise.
*
* Since: 2.26
*/
gboolean
g_dbus_is_guid (const gchar *string)
{
gboolean ret;
guint n;
g_return_val_if_fail (string != NULL, FALSE);
ret = FALSE;
for (n = 0; n < 32; n++)
{
if (!g_ascii_isxdigit (string[n]))
goto out;
}
if (string[32] != '\0')
goto out;
ret = TRUE;
out:
return ret;
}
/* ---------------------------------------------------------------------------------------------------- */
/**
* g_dbus_gvariant_to_gvalue:
* @value: A #GVariant.
* @out_gvalue: (out): Return location pointing to a zero-filled (uninitialized) #GValue.
*
* Converts a #GVariant to a #GValue. If @value is floating, it is consumed.
*
* The rules specified in the g_dbus_gvalue_to_gvariant() function are
* used - this function is essentially its reverse form. So, a #GVariant
* containing any basic or string array type will be converted to a #GValue
* containing a basic value or string array. Any other #GVariant (handle,
* variant, tuple, dict entry) will be converted to a #GValue containing that
* #GVariant.
*
* The conversion never fails - a valid #GValue is always returned in
* @out_gvalue.
*
* Since: 2.30
*/
void
g_dbus_gvariant_to_gvalue (GVariant *value,
GValue *out_gvalue)
{
const GVariantType *type;
gchar **array;
g_return_if_fail (value != NULL);
g_return_if_fail (out_gvalue != NULL);
memset (out_gvalue, '\0', sizeof (GValue));
switch (g_variant_classify (value))
{
case G_VARIANT_CLASS_BOOLEAN:
g_value_init (out_gvalue, G_TYPE_BOOLEAN);
g_value_set_boolean (out_gvalue, g_variant_get_boolean (value));
break;
case G_VARIANT_CLASS_BYTE:
g_value_init (out_gvalue, G_TYPE_UCHAR);
g_value_set_uchar (out_gvalue, g_variant_get_byte (value));
break;
case G_VARIANT_CLASS_INT16:
g_value_init (out_gvalue, G_TYPE_INT);
g_value_set_int (out_gvalue, g_variant_get_int16 (value));
break;
case G_VARIANT_CLASS_UINT16:
g_value_init (out_gvalue, G_TYPE_UINT);
g_value_set_uint (out_gvalue, g_variant_get_uint16 (value));
break;
case G_VARIANT_CLASS_INT32:
g_value_init (out_gvalue, G_TYPE_INT);
g_value_set_int (out_gvalue, g_variant_get_int32 (value));
break;
case G_VARIANT_CLASS_UINT32:
g_value_init (out_gvalue, G_TYPE_UINT);
g_value_set_uint (out_gvalue, g_variant_get_uint32 (value));
break;
case G_VARIANT_CLASS_INT64:
g_value_init (out_gvalue, G_TYPE_INT64);
g_value_set_int64 (out_gvalue, g_variant_get_int64 (value));
break;
case G_VARIANT_CLASS_UINT64:
g_value_init (out_gvalue, G_TYPE_UINT64);
g_value_set_uint64 (out_gvalue, g_variant_get_uint64 (value));
break;
case G_VARIANT_CLASS_DOUBLE:
g_value_init (out_gvalue, G_TYPE_DOUBLE);
g_value_set_double (out_gvalue, g_variant_get_double (value));
break;
case G_VARIANT_CLASS_STRING:
g_value_init (out_gvalue, G_TYPE_STRING);
g_value_set_string (out_gvalue, g_variant_get_string (value, NULL));
break;
case G_VARIANT_CLASS_OBJECT_PATH:
g_value_init (out_gvalue, G_TYPE_STRING);
g_value_set_string (out_gvalue, g_variant_get_string (value, NULL));
break;
case G_VARIANT_CLASS_SIGNATURE:
g_value_init (out_gvalue, G_TYPE_STRING);
g_value_set_string (out_gvalue, g_variant_get_string (value, NULL));
break;
case G_VARIANT_CLASS_ARRAY:
type = g_variant_get_type (value);
switch (g_variant_type_peek_string (type)[1])
{
case G_VARIANT_CLASS_BYTE:
g_value_init (out_gvalue, G_TYPE_STRING);
g_value_set_string (out_gvalue, g_variant_get_bytestring (value));
break;
case G_VARIANT_CLASS_STRING:
g_value_init (out_gvalue, G_TYPE_STRV);
array = g_variant_dup_strv (value, NULL);
g_value_take_boxed (out_gvalue, array);
break;
case G_VARIANT_CLASS_OBJECT_PATH:
g_value_init (out_gvalue, G_TYPE_STRV);
array = g_variant_dup_objv (value, NULL);
g_value_take_boxed (out_gvalue, array);
break;
case G_VARIANT_CLASS_ARRAY:
switch (g_variant_type_peek_string (type)[2])
{
case G_VARIANT_CLASS_BYTE:
g_value_init (out_gvalue, G_TYPE_STRV);
array = g_variant_dup_bytestring_array (value, NULL);
g_value_take_boxed (out_gvalue, array);
break;
default:
g_value_init (out_gvalue, G_TYPE_VARIANT);
g_value_set_variant (out_gvalue, value);
break;
}
break;
default:
g_value_init (out_gvalue, G_TYPE_VARIANT);
g_value_set_variant (out_gvalue, value);
break;
}
break;
case G_VARIANT_CLASS_HANDLE:
case G_VARIANT_CLASS_VARIANT:
case G_VARIANT_CLASS_MAYBE:
case G_VARIANT_CLASS_TUPLE:
case G_VARIANT_CLASS_DICT_ENTRY:
g_value_init (out_gvalue, G_TYPE_VARIANT);
g_value_set_variant (out_gvalue, value);
break;
}
}
/**
* g_dbus_gvalue_to_gvariant:
* @gvalue: A #GValue to convert to a #GVariant
* @type: A #GVariantType
*
* Converts a #GValue to a #GVariant of the type indicated by the @type
* parameter.
*
* The conversion is using the following rules:
*
* - #G_TYPE_STRING: 's', 'o', 'g' or 'ay'
* - #G_TYPE_STRV: 'as', 'ao' or 'aay'
* - #G_TYPE_BOOLEAN: 'b'
* - #G_TYPE_UCHAR: 'y'
* - #G_TYPE_INT: 'i', 'n'
* - #G_TYPE_UINT: 'u', 'q'
* - #G_TYPE_INT64 'x'
* - #G_TYPE_UINT64: 't'
* - #G_TYPE_DOUBLE: 'd'
* - #G_TYPE_VARIANT: Any #GVariantType
*
* This can fail if e.g. @gvalue is of type #G_TYPE_STRING and @type
* is ['i'][G-VARIANT-TYPE-INT32:CAPS]. It will also fail for any #GType
* (including e.g. #G_TYPE_OBJECT and #G_TYPE_BOXED derived-types) not
* in the table above.
*
* Note that if @gvalue is of type #G_TYPE_VARIANT and its value is
* %NULL, the empty #GVariant instance (never %NULL) for @type is
* returned (e.g. 0 for scalar types, the empty string for string types,
* '/' for object path types, the empty array for any array type and so on).
*
* See the g_dbus_gvariant_to_gvalue() function for how to convert a
* #GVariant to a #GValue.
*
* Returns: A #GVariant (never floating) of #GVariantType @type holding
* the data from @gvalue or %NULL in case of failure. Free with
* g_variant_unref().
*
* Since: 2.30
*/
GVariant *
g_dbus_gvalue_to_gvariant (const GValue *gvalue,
const GVariantType *type)
{
GVariant *ret;
const gchar *s;
const gchar * const *as;
const gchar *empty_strv[1] = {NULL};
g_return_val_if_fail (gvalue != NULL, NULL);
g_return_val_if_fail (type != NULL, NULL);
ret = NULL;
/* @type can easily be e.g. "s" with the GValue holding a GVariant - for example this
* can happen when using the org.gtk.GDBus.C.ForceGVariant annotation with the
* gdbus-codegen(1) tool.
*/
if (G_VALUE_TYPE (gvalue) == G_TYPE_VARIANT)
{
ret = g_value_dup_variant (gvalue);
}
else
{
switch (g_variant_type_peek_string (type)[0])
{
case G_VARIANT_CLASS_BOOLEAN:
ret = g_variant_ref_sink (g_variant_new_boolean (g_value_get_boolean (gvalue)));
break;
case G_VARIANT_CLASS_BYTE:
ret = g_variant_ref_sink (g_variant_new_byte (g_value_get_uchar (gvalue)));
break;
case G_VARIANT_CLASS_INT16:
ret = g_variant_ref_sink (g_variant_new_int16 (g_value_get_int (gvalue)));
break;
case G_VARIANT_CLASS_UINT16:
ret = g_variant_ref_sink (g_variant_new_uint16 (g_value_get_uint (gvalue)));
break;
case G_VARIANT_CLASS_INT32:
ret = g_variant_ref_sink (g_variant_new_int32 (g_value_get_int (gvalue)));
break;
case G_VARIANT_CLASS_UINT32:
ret = g_variant_ref_sink (g_variant_new_uint32 (g_value_get_uint (gvalue)));
break;
case G_VARIANT_CLASS_INT64:
ret = g_variant_ref_sink (g_variant_new_int64 (g_value_get_int64 (gvalue)));
break;
case G_VARIANT_CLASS_UINT64:
ret = g_variant_ref_sink (g_variant_new_uint64 (g_value_get_uint64 (gvalue)));
break;
case G_VARIANT_CLASS_DOUBLE:
ret = g_variant_ref_sink (g_variant_new_double (g_value_get_double (gvalue)));
break;
case G_VARIANT_CLASS_STRING:
s = g_value_get_string (gvalue);
if (s == NULL)
s = "";
ret = g_variant_ref_sink (g_variant_new_string (s));
break;
case G_VARIANT_CLASS_OBJECT_PATH:
s = g_value_get_string (gvalue);
if (s == NULL)
s = "/";
ret = g_variant_ref_sink (g_variant_new_object_path (s));
break;
case G_VARIANT_CLASS_SIGNATURE:
s = g_value_get_string (gvalue);
if (s == NULL)
s = "";
ret = g_variant_ref_sink (g_variant_new_signature (s));
break;
case G_VARIANT_CLASS_ARRAY:
switch (g_variant_type_peek_string (type)[1])
{
case G_VARIANT_CLASS_BYTE:
s = g_value_get_string (gvalue);
if (s == NULL)
s = "";
ret = g_variant_ref_sink (g_variant_new_bytestring (s));
break;
case G_VARIANT_CLASS_STRING:
as = g_value_get_boxed (gvalue);
if (as == NULL)
as = empty_strv;
ret = g_variant_ref_sink (g_variant_new_strv (as, -1));
break;
case G_VARIANT_CLASS_OBJECT_PATH:
as = g_value_get_boxed (gvalue);
if (as == NULL)
as = empty_strv;
ret = g_variant_ref_sink (g_variant_new_objv (as, -1));
break;
case G_VARIANT_CLASS_ARRAY:
switch (g_variant_type_peek_string (type)[2])
{
case G_VARIANT_CLASS_BYTE:
as = g_value_get_boxed (gvalue);
if (as == NULL)
as = empty_strv;
ret = g_variant_ref_sink (g_variant_new_bytestring_array (as, -1));
break;
default:
ret = g_value_dup_variant (gvalue);
break;
}
break;
default:
ret = g_value_dup_variant (gvalue);
break;
}
break;
case G_VARIANT_CLASS_HANDLE:
case G_VARIANT_CLASS_VARIANT:
case G_VARIANT_CLASS_MAYBE:
case G_VARIANT_CLASS_TUPLE:
case G_VARIANT_CLASS_DICT_ENTRY:
ret = g_value_dup_variant (gvalue);
break;
}
}
/* Could be that the GValue is holding a NULL GVariant - in that case,
* we return an "empty" GVariant instead of a NULL GVariant
*/
if (ret == NULL)
{
GVariant *untrusted_empty;
untrusted_empty = g_variant_new_from_data (type, NULL, 0, FALSE, NULL, NULL);
ret = g_variant_ref_sink (g_variant_get_normal_form (untrusted_empty));
g_variant_unref (untrusted_empty);
}
g_assert (!g_variant_is_floating (ret));
return ret;
}
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