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/*
* This file is part of TelepathyQt4
*
* Copyright (C) 2010 Collabora Ltd. <http://www.collabora.co.uk/>
* Copyright (C) 2010 Nokia Corporation
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <TelepathyQt4/Utils>
#include <QByteArray>
#include <QString>
/**
* \defgroup utility functions
*/
namespace Tp
{
static inline bool isBad(char c, bool isFirst)
{
return ((c < 'a' || c > 'z') &&
(c < 'A' || c > 'Z') &&
(c < '0' || c > '9' || isFirst));
}
/**
* Escape an arbitrary string so it follows the rules for a C identifier,
* and hence an object path component, interface element component,
* bus name component or member name in D-Bus.
*
* This is a reversible encoding, so it preserves distinctness.
*
* The escaping consists of replacing all non-alphanumerics, and the first
* character if it's a digit, with an underscore and two lower-case hex
* digits:
*
* "0123abc_xyz\x01\xff" -> _30123abc_5fxyz_01_ff
*
* i.e. similar to URI encoding, but with _ taking the role of %, and a
* smaller allowed set. As a special case, "" is escaped to "_" (just for
* completeness, really).
*
* \param string The string to be escaped.
* \return the escaped string.
*/
QString escapeAsIdentifier(const QString &string)
{
bool bad = false;
QByteArray op;
QByteArray utf8;
const char *name;
const char *ptr, *firstOk;
/* This function is copy/pasted from tp_escape_as_identified from
* telepathy-glib. */
/* fast path for empty name */
if (string.isEmpty()) {
return QString::fromLatin1("_");
}
utf8 = string.toUtf8();
name = utf8.constData();
for (ptr = name; *ptr; ptr++) {
if (isBad(*ptr, ptr == name)) {
bad = true;
break;
}
}
/* fast path if it's clean */
if (!bad) {
return string;
}
/* If strictly less than ptr, firstOk is the first uncopied safe character.
*/
firstOk = name;
for (ptr = name; *ptr; ptr++) {
if (isBad(*ptr, ptr == name)) {
char buf[4] = { 0, };
/* copy preceding safe characters if any */
if (firstOk < ptr) {
op.append(firstOk, ptr - firstOk);
}
/* escape the unsafe character */
qsnprintf(buf, sizeof (buf), "_%02x", (unsigned char)(*ptr));
op.append(buf);
/* restart after it */
firstOk = ptr + 1;
}
}
/* copy trailing safe characters if any */
if (firstOk < ptr) {
op.append(firstOk, ptr - firstOk);
}
return QString::fromLatin1(op.constData());
}
} // Tp
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