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<h1 class="title">bencodeparser.cpp Example File</h1>
<span class="subtitle">torrent/bencodeparser.cpp</span>
<!-- $$$torrent/bencodeparser.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "bencodeparser.h"</span>
<span class="preprocessor">#include <QList></span>
<span class="preprocessor">#include <QMetaType></span>
BencodeParser<span class="operator">::</span>BencodeParser()
{
}
bool BencodeParser<span class="operator">::</span>parse(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> <span class="operator">&</span>content)
{
<span class="keyword">if</span> (content<span class="operator">.</span>isEmpty()) {
errString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"No content"</span>);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>content <span class="operator">=</span> content;
index <span class="operator">=</span> <span class="number">0</span>;
infoStart <span class="operator">=</span> <span class="number">0</span>;
infoLength <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">return</span> getDictionary(<span class="operator">&</span>dictionaryValue);
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> BencodeParser<span class="operator">::</span>errorString() <span class="keyword">const</span>
{
<span class="keyword">return</span> errString;
}
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> BencodeParser<span class="operator">::</span>dictionary() <span class="keyword">const</span>
{
<span class="keyword">return</span> dictionaryValue;
}
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> BencodeParser<span class="operator">::</span>infoSection() <span class="keyword">const</span>
{
<span class="keyword">return</span> content<span class="operator">.</span>mid(infoStart<span class="operator">,</span> infoLength);
}
bool BencodeParser<span class="operator">::</span>getByteString(<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> <span class="operator">*</span>byteString)
{
<span class="keyword">const</span> <span class="type">int</span> contentSize <span class="operator">=</span> content<span class="operator">.</span>size();
<span class="type">int</span> size <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
<span class="keyword">do</span> {
<span class="type">char</span> c <span class="operator">=</span> content<span class="operator">.</span>at(index);
<span class="keyword">if</span> (c <span class="operator"><</span> <span class="char">'0'</span> <span class="operator">|</span><span class="operator">|</span> c <span class="operator">></span> <span class="char">'9'</span>) {
<span class="keyword">if</span> (size <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="keyword">if</span> (c <span class="operator">!</span><span class="operator">=</span> <span class="char">':'</span>) {
errString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"Unexpected character at pos %1: %2"</span>)
<span class="operator">.</span>arg(index)<span class="operator">.</span>arg(c);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">break</span>;
}
<span class="keyword">if</span> (size <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
size <span class="operator">=</span> <span class="number">0</span>;
size <span class="operator">*</span><span class="operator">=</span> <span class="number">10</span>;
size <span class="operator">+</span><span class="operator">=</span> c <span class="operator">-</span> <span class="char">'0'</span>;
} <span class="keyword">while</span> (<span class="operator">+</span><span class="operator">+</span>index <span class="operator"><</span> contentSize);
<span class="keyword">if</span> (byteString)
<span class="operator">*</span>byteString <span class="operator">=</span> content<span class="operator">.</span>mid(index<span class="operator">,</span> size);
index <span class="operator">+</span><span class="operator">=</span> size;
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool BencodeParser<span class="operator">::</span>getInteger(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> <span class="operator">*</span>integer)
{
<span class="keyword">const</span> <span class="type">int</span> contentSize <span class="operator">=</span> content<span class="operator">.</span>size();
<span class="keyword">if</span> (content<span class="operator">.</span>at(index) <span class="operator">!</span><span class="operator">=</span> <span class="char">'i'</span>)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="operator">+</span><span class="operator">+</span>index;
<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> num <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
bool negative <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">do</span> {
<span class="type">char</span> c <span class="operator">=</span> content<span class="operator">.</span>at(index);
<span class="keyword">if</span> (c <span class="operator"><</span> <span class="char">'0'</span> <span class="operator">|</span><span class="operator">|</span> c <span class="operator">></span> <span class="char">'9'</span>) {
<span class="keyword">if</span> (num <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
<span class="keyword">if</span> (c <span class="operator">!</span><span class="operator">=</span> <span class="char">'-'</span> <span class="operator">|</span><span class="operator">|</span> negative)
<span class="keyword">return</span> <span class="keyword">false</span>;
negative <span class="operator">=</span> <span class="keyword">true</span>;
<span class="keyword">continue</span>;
} <span class="keyword">else</span> {
<span class="keyword">if</span> (c <span class="operator">!</span><span class="operator">=</span> <span class="char">'e'</span>) {
errString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"Unexpected character at pos %1: %2"</span>)
<span class="operator">.</span>arg(index)<span class="operator">.</span>arg(c);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">break</span>;
}
}
<span class="keyword">if</span> (num <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
num <span class="operator">=</span> <span class="number">0</span>;
num <span class="operator">*</span><span class="operator">=</span> <span class="number">10</span>;
num <span class="operator">+</span><span class="operator">=</span> c <span class="operator">-</span> <span class="char">'0'</span>;
} <span class="keyword">while</span> (<span class="operator">+</span><span class="operator">+</span>index <span class="operator"><</span> contentSize);
<span class="keyword">if</span> (integer)
<span class="operator">*</span>integer <span class="operator">=</span> negative <span class="operator">?</span> <span class="operator">-</span>num : num;
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool BencodeParser<span class="operator">::</span>getList(<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> <span class="operator">*</span>list)
{
<span class="keyword">const</span> <span class="type">int</span> contentSize <span class="operator">=</span> content<span class="operator">.</span>size();
<span class="keyword">if</span> (content<span class="operator">.</span>at(index) <span class="operator">!</span><span class="operator">=</span> <span class="char">'l'</span>)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> tmp;
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">do</span> {
<span class="keyword">if</span> (content<span class="operator">.</span>at(index) <span class="operator">=</span><span class="operator">=</span> <span class="char">'e'</span>) {
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">break</span>;
}
<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> number;
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> byteString;
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> tmpList;
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> dictionary;
<span class="keyword">if</span> (getInteger(<span class="operator">&</span>number))
tmp <span class="operator"><</span><span class="operator"><</span> number;
<span class="keyword">else</span> <span class="keyword">if</span> (getByteString(<span class="operator">&</span>byteString))
tmp <span class="operator"><</span><span class="operator"><</span> byteString;
<span class="keyword">else</span> <span class="keyword">if</span> (getList(<span class="operator">&</span>tmpList))
tmp <span class="operator"><</span><span class="operator"><</span> tmpList;
<span class="keyword">else</span> <span class="keyword">if</span> (getDictionary(<span class="operator">&</span>dictionary))
tmp <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue<span class="operator"><</span><span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> <span class="operator">></span>(dictionary);
<span class="keyword">else</span> {
errString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"error at index %1"</span>)<span class="operator">.</span>arg(index);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
} <span class="keyword">while</span> (index <span class="operator"><</span> contentSize);
<span class="keyword">if</span> (list)
<span class="operator">*</span>list <span class="operator">=</span> tmp;
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool BencodeParser<span class="operator">::</span>getDictionary(<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> <span class="operator">*</span>dictionary)
{
<span class="keyword">const</span> <span class="type">int</span> contentSize <span class="operator">=</span> content<span class="operator">.</span>size();
<span class="keyword">if</span> (content<span class="operator">.</span>at(index) <span class="operator">!</span><span class="operator">=</span> <span class="char">'d'</span>)
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> tmp;
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">do</span> {
<span class="keyword">if</span> (content<span class="operator">.</span>at(index) <span class="operator">=</span><span class="operator">=</span> <span class="char">'e'</span>) {
<span class="operator">+</span><span class="operator">+</span>index;
<span class="keyword">break</span>;
}
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> key;
<span class="keyword">if</span> (<span class="operator">!</span>getByteString(<span class="operator">&</span>key))
<span class="keyword">break</span>;
<span class="keyword">if</span> (key <span class="operator">=</span><span class="operator">=</span> <span class="string">"info"</span>)
infoStart <span class="operator">=</span> index;
<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> number;
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> byteString;
<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> tmpList;
<span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> dictionary;
<span class="keyword">if</span> (getInteger(<span class="operator">&</span>number))
tmp<span class="operator">.</span>insert(key<span class="operator">,</span> number);
<span class="keyword">else</span> <span class="keyword">if</span> (getByteString(<span class="operator">&</span>byteString))
tmp<span class="operator">.</span>insert(key<span class="operator">,</span> byteString);
<span class="keyword">else</span> <span class="keyword">if</span> (getList(<span class="operator">&</span>tmpList))
tmp<span class="operator">.</span>insert(key<span class="operator">,</span> tmpList);
<span class="keyword">else</span> <span class="keyword">if</span> (getDictionary(<span class="operator">&</span>dictionary))
tmp<span class="operator">.</span>insert(key<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue<span class="operator"><</span><span class="type"><a href="../qtcore/qmap.html">QMap</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span><span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span><span class="operator">></span> <span class="operator">></span>(dictionary));
<span class="keyword">else</span> {
errString <span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="string">"error at index %1"</span>)<span class="operator">.</span>arg(index);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="keyword">if</span> (key <span class="operator">=</span><span class="operator">=</span> <span class="string">"info"</span>)
infoLength <span class="operator">=</span> index <span class="operator">-</span> infoStart;
} <span class="keyword">while</span> (index <span class="operator"><</span> contentSize);
<span class="keyword">if</span> (dictionary)
<span class="operator">*</span>dictionary <span class="operator">=</span> tmp;
<span class="keyword">return</span> <span class="keyword">true</span>;
}
</pre>
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<!-- @@@torrent/bencodeparser.cpp -->
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