/**
* Used for determining if Forum ID is authed, please use this Function on all Posting Screens
*/
function is_forum_authed($auth_cache, $check_forum_id)
{
$one_char_encoding = '#';
$two_char_encoding = '.';
if (trim($auth_cache) == '') {
return true;
}
$auth = array();
$auth_len = 1;
for ($pos = 0; $pos < strlen($auth_cache); $pos += $auth_len) {
$forum_auth = substr($auth_cache, $pos, 1);
if ($forum_auth == $one_char_encoding) {
$auth_len = 1;
continue;
} elseif ($forum_auth == $two_char_encoding) {
$auth_len = 2;
$pos--;
continue;
}
$forum_auth = substr($auth_cache, $pos, $auth_len);
$forum_id = (int) base64_unpack($forum_auth);
if ($forum_id == $check_forum_id) {
return true;
}
}
return false;
}
/**
* Reverse the auth_pack process
*/
function auth_unpack($auth_cache)
{
$one_char_encoding = '#';
$two_char_encoding = '.';
$auth = array();
$auth_len = 1;
for ($pos = 0; $pos < strlen($auth_cache); $pos += $auth_len) {
$forum_auth = substr($auth_cache, $pos, 1);
if ($forum_auth == $one_char_encoding) {
$auth_len = 1;
continue;
} elseif ($forum_auth == $two_char_encoding) {
$auth_len = 2;
$pos--;
continue;
}
$forum_auth = substr($auth_cache, $pos, $auth_len);
$forum_id = base64_unpack($forum_auth);
$auth[] = intval($forum_id);
}
return $auth;
}
/**
* Obtain list of forums in which different attachment categories can be used
*/
function phpbb_attachment_forum_perms($forum_permissions)
{
if (empty($forum_permissions))
{
return '';
}
// Decode forum permissions
$forum_ids = array();
$one_char_encoding = '#';
$two_char_encoding = '.';
$auth_len = 1;
for ($pos = 0; $pos < strlen($forum_permissions); $pos += $auth_len)
{
$forum_auth = substr($forum_permissions, $pos, 1);
if ($forum_auth == $one_char_encoding)
{
$auth_len = 1;
continue;
}
else if ($forum_auth == $two_char_encoding)
{
$auth_len = 2;
$pos--;
continue;
}
$forum_auth = substr($forum_permissions, $pos, $auth_len);
$forum_id = base64_unpack($forum_auth);
$forum_ids[] = (int) $forum_id;
}
if (sizeof($forum_ids))
{
return attachment_forum_perms($forum_ids);
}
return '';
}