<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>bencodeparser.cpp Example File | Qt Network 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-torrent-example.html">Torrent Example</a></td><td >bencodeparser.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <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> </div> <!-- @@@torrent/bencodeparser.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>