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/*
* dLeyna
*
* Copyright (C) 2012-2017 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Rick Bell <richard.s.bell@intel.com>
*
*/
#include <string.h>
#include "core.h"
gchar *dleyna_core_prv_convert_udn_to_path(const gchar *udn)
{
size_t len;
size_t dest_len;
size_t i;
/* This function will generate a valid dbus path from the udn
* We are not going to check the UDN validity. We will try to
* convert it anyway. To avoid any security problem, we will
* check some limits and possibly return only a partial
* UDN. For a better understanding, a valid UDN should be:
* UDN = "uuid:4Hex-2Hex-2Hex-2Hex-6Hex"
*
* The convertion rules are:
* 1 - An invalid char will be escaped using its hexa representation
* prefixed with '_':
* Example 1 ': ' -> '_3A'
* Example 2 '- ' -> '_2D'
* 2 - The max size of the converted UDN can be 3 times the original
* size (if all char are not dbus compliant).
* The max size of a dbus path is an UINT32: G_MAXUINT32
* We will limit the of the converted string size to G_MAXUINT32 / 2
* otherwise we will never have space to generate object path.
*/
len = strlen(udn);
dest_len = MIN(len * 3, G_MAXINT32 / 2);
GString *uuid = g_string_new_len(NULL, (gssize) dest_len);
i = 0;
while (*udn && (i < dest_len))
{
if(g_ascii_isalnum(*udn) || (*udn == '_')) {
g_string_append_c(uuid, *udn);
i++;
} else {
g_string_append_printf(uuid, "_%02x", *udn);
i += 3;
}
udn++;
}
return g_string_free(uuid, FALSE);
}
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