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/****************************************************************************
**
** Copyright (C) 2015 Digia Plc
** All rights reserved.
** For any questions to Digia, please use the contact form at
** http://www.qt.io
**
** This file is part of Qt Enterprise Embedded.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** the contact form at http://www.qt.io
**
****************************************************************************/
#include "qwifiutils_p.h"
QT_BEGIN_NAMESPACE
int QWifiUtils::hex2num(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
int QWifiUtils::hex2byte(const char *hex)
{
int a, b;
a = hex2num(*hex++);
if (a < 0)
return -1;
b = hex2num(*hex++);
if (b < 0)
return -1;
return (a << 4) | b;
}
// the logic of this function is taken from wpa_supplicant source code (BSD
// licensed code) see http://w1.fi/cgit file hostapd/src/utils/common.c
// For Ascii encoded string, any octet < 32 or > 127 is encoded as a "\x"
// followed by the hex representation of the octet. Exception chars are ",
// \, \e, \n, \r, \t which are escaped by a backslash
QString QWifiUtils::decodeHexEncoded(const QString &encoded)
{
int maxlen = encoded.size() + 1;
QByteArray buf;
buf.resize(maxlen);
const char *pos = encoded.toLocal8Bit().constData();
int len = 0;
int val;
while (*pos) {
if (len + 1 >= maxlen)
break;
switch (*pos) {
case '\\':
pos++;
switch (*pos) {
case '\\':
buf[len++] = '\\';
pos++;
break;
case '"':
buf[len++] = '"';
pos++;
break;
case 'n':
buf[len++] = '\n';
pos++;
break;
case 'r':
buf[len++] = '\r';
pos++;
break;
case 't':
buf[len++] = '\t';
pos++;
break;
case 'e':
buf[len++] = '\033';
pos++;
break;
case 'x':
pos++;
val = hex2byte(pos);
if (val < 0) {
val = hex2num(*pos);
if (val < 0)
break;
buf[len++] = val;
pos++;
} else {
buf[len++] = val;
pos += 2;
}
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = *pos++ - '0';
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
if (*pos >= '0' && *pos <= '7')
val = val * 8 + (*pos++ - '0');
buf[len++] = val;
break;
default:
break;
}
break;
default:
buf[len++] = *pos++;
break;
}
}
if (maxlen > len)
buf[len] = '\0';
return QString::fromUtf8(buf);
}
QT_END_NAMESPACE
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