source: s10k/CommonLibs/quazip-0.7.2/doc/html/faq.html @ 1096

Last change on this file since 1096 was 1096, checked in by s10k, 19 months ago

Added zlib, quazip, basicxmlsyntaxhighlighter, conditionalsemaphore and linenumberdisplay libraries. zlib and quazip are pre-compiled, but you can compile them yourself, just delete the dll files (or equivalent binary files to your OS)

File size: 4.5 KB
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1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2<html xmlns="http://www.w3.org/1999/xhtml">
3<head>
4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
5<title>QuaZIP: QuaZip FAQ</title>
6<link href="tabs.css" rel="stylesheet" type="text/css"/>
7<link href="doxygen.css" rel="stylesheet" type="text/css"/>
8</head>
9<body>
10<!-- Generated by Doxygen 1.7.4 -->
11<div id="top">
12<div id="titlearea">
13<table cellspacing="0" cellpadding="0">
14 <tbody>
15 <tr style="height: 56px;">
16  <td style="padding-left: 0.5em;">
17   <div id="projectname">QuaZIP&#160;<span id="projectnumber">quazip-0-7-2</span></div>
18  </td>
19 </tr>
20 </tbody>
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22</div>
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24    <ul class="tablist">
25      <li><a href="index.html"><span>Main&#160;Page</span></a></li>
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30    </ul>
31  </div>
32</div>
33<div class="header">
34  <div class="headertitle">
35<div class="title"><a class="el" href="classQuaZip.html" title="ZIP archive.">QuaZip</a> FAQ </div>  </div>
36</div>
37<div class="contents">
38<div class="textblock"><p><a class="anchor" id="faq-non-QIODevice"></a> Q. Is there any way to use <a class="el" href="classQuaZipFile.html" title="A file inside ZIP archive.">QuaZipFile</a> in <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qt.html">Qt</a> where you are supposed to use normal (non-zipped) file, but not through <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qiodevice.html">QIODevice</a> API?</p>
39<p>A. Usually not. For example, if you are passing file name to some database driver (like SQLite), <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qt.html">Qt</a> usually just passes this name down to the 3rd-party library, which is usually does not know anything about <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qiodevice.html">QIODevice</a> and therefore there is no way to pass <a class="el" href="classQuaZipFile.html" title="A file inside ZIP archive.">QuaZipFile</a> as normal file. However, if we are talking about some place where you pass file name, and then indirectly use <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qfile.html">QFile</a> to open it, then it is a good idea to make overloaded method, which accepts a <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qiodevice.html">QIODevice</a> pointer. Then you would be able to pass <a class="el" href="classQuaZipFile.html" title="A file inside ZIP archive.">QuaZipFile</a> as well as many other nice things such as <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qbuffer.html">QBuffer</a> or <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qprocess.html">QProcess</a>.</p>
40<p><a class="anchor" id="faq-zip64"></a> Q. Can QuaZIP handle files larger than 4GB? What about zip64 standard?</p>
41<p>A. Starting with version 0.6, QuaZIP uses Minizip 1.1 with zip64 support which should handle large files perfectly. The zip64 support in Minizip looks like it's not 100% conforming to the standard, but 3rd party tools seem to have no problem with the resulting archives.</p>
42<p><a class="anchor" id="faq-seekable"></a> Q. Can QuaZIP write archives to a sequential <a class="elRef" doxygen="qtcore.tags:http://doc.qt.io/qt-5//" href="http://doc.qt.io/qt-5/qiodevice.html">QIODevice</a> like QTcpSocket?</p>
43<p>A. Not yet. It is not supported by vanilla Minizip (the back-end QuaZIP uses), although theoretically possible according to the ZIP standard. It would require some Minizip modifications that would allow it to detect non-seekable I/O and produce necessary output structures. QuaZIP already writes data descriptor which is necessary for non-seekable I/O. The only thing that is apparently left is to make Minizip fill local headers with correct values and forget about seeking after closing the file. </p>
44</div></div>
45<hr class="footer"/><address class="footer"><small>Generated on Sun Apr 3 2016 08:26:24 for QuaZIP by&#160;
46<a href="http://www.doxygen.org/index.html">
47<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.4 </small></address>
48</body>
49</html>
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