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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "sshpacketparser_p.h"
#include <cctype>
namespace QSsh {
namespace Internal {
namespace { quint32 size(const QByteArray &data) { return data.size(); } }
QString SshPacketParser::asUserString(const QByteArray &rawString)
{
QByteArray filteredString;
filteredString.resize(rawString.size());
for (int i = 0; i < rawString.size(); ++i) {
const char c = rawString.at(i);
filteredString[i]
= std::isprint(c) || c == '\n' || c == '\r' || c == '\t' ? c : '?';
}
return QString::fromUtf8(filteredString);
}
bool SshPacketParser::asBool(const QByteArray &data, quint32 offset)
{
if (size(data) <= offset)
throw SshPacketParseException();
return data.at(offset);
}
bool SshPacketParser::asBool(const QByteArray &data, quint32 *offset)
{
bool b = asBool(data, *offset);
++(*offset);
return b;
}
quint32 SshPacketParser::asUint32(const QByteArray &data, quint32 offset)
{
if (size(data) < offset + 4)
throw SshPacketParseException();
const quint32 value = ((data.at(offset) & 0xff) << 24)
+ ((data.at(offset + 1) & 0xff) << 16)
+ ((data.at(offset + 2) & 0xff) << 8) + (data.at(offset + 3) & 0xff);
return value;
}
quint32 SshPacketParser::asUint32(const QByteArray &data, quint32 *offset)
{
const quint32 v = asUint32(data, *offset);
*offset += 4;
return v;
}
quint64 SshPacketParser::asUint64(const QByteArray &data, quint32 offset)
{
if (size(data) < offset + 8)
throw SshPacketParseException();
const quint64 value = (static_cast<quint64>(data.at(offset) & 0xff) << 56)
+ (static_cast<quint64>(data.at(offset + 1) & 0xff) << 48)
+ (static_cast<quint64>(data.at(offset + 2) & 0xff) << 40)
+ (static_cast<quint64>(data.at(offset + 3) & 0xff) << 32)
+ ((data.at(offset + 4) & 0xff) << 24)
+ ((data.at(offset + 5) & 0xff) << 16)
+ ((data.at(offset + 6) & 0xff) << 8)
+ (data.at(offset + 7) & 0xff);
return value;
}
quint64 SshPacketParser::asUint64(const QByteArray &data, quint32 *offset)
{
const quint64 val = asUint64(data, *offset);
*offset += 8;
return val;
}
QByteArray SshPacketParser::asString(const QByteArray &data, quint32 *offset)
{
const quint32 length = asUint32(data, offset);
if (size(data) < *offset + length)
throw SshPacketParseException();
const QByteArray &string = data.mid(*offset, length);
*offset += length;
return string;
}
QString SshPacketParser::asUserString(const QByteArray &data, quint32 *offset)
{
return asUserString(asString(data, offset));
}
SshNameList SshPacketParser::asNameList(const QByteArray &data, quint32 *offset)
{
const quint32 length = asUint32(data, offset);
const int listEndPos = *offset + length;
if (data.size() < listEndPos)
throw SshPacketParseException();
SshNameList names(length + 4);
int nextNameOffset = *offset;
int nextCommaOffset = data.indexOf(',', nextNameOffset);
while (nextNameOffset > 0 && nextNameOffset < listEndPos) {
const int stringEndPos = nextCommaOffset == -1
|| nextCommaOffset > listEndPos ? listEndPos : nextCommaOffset;
names.names << QByteArray(data.constData() + nextNameOffset,
stringEndPos - nextNameOffset);
nextNameOffset = nextCommaOffset + 1;
nextCommaOffset = data.indexOf(',', nextNameOffset);
}
*offset += length;
return names;
}
Botan::BigInt SshPacketParser::asBigInt(const QByteArray &data, quint32 *offset)
{
const quint32 length = asUint32(data, offset);
if (length == 0)
return Botan::BigInt();
const Botan::byte *numberStart
= reinterpret_cast<const Botan::byte *>(data.constData() + *offset);
*offset += length;
return Botan::BigInt::decode(numberStart, length);
}
} // namespace Internal
} // namespace QSsh
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