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<div class="navpath"><a class="el" href="dir_b47abd1aad201a152869566145babb61.html">src</a> » <a class="el" href="dir_3459d97d61361c9d41d467fba45f9c61.html">common</a>
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<h1>ZlibByteArray.cpp</h1><a href="_zlib_byte_array_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">** This file is part of Vidalia, and is subject to the license terms in the</span>
<a name="l00003"></a>00003 <span class="comment">** LICENSE file, found in the top level directory of this distribution. If you</span>
<a name="l00004"></a>00004 <span class="comment">** did not receive the LICENSE file with this file, you may obtain it from the</span>
<a name="l00005"></a>00005 <span class="comment">** Vidalia source package distributed by the Vidalia Project at</span>
<a name="l00006"></a>00006 <span class="comment">** http://www.vidalia-project.net/. No part of Vidalia, including this file,</span>
<a name="l00007"></a>00007 <span class="comment">** may be copied, modified, propagated, or distributed except according to the</span>
<a name="l00008"></a>00008 <span class="comment">** terms described in the LICENSE file.</span>
<a name="l00009"></a>00009 <span class="comment">**</span>
<a name="l00010"></a>00010 <span class="comment">** * * *</span>
<a name="l00011"></a>00011 <span class="comment">** </span>
<a name="l00012"></a>00012 <span class="comment">** Zlib support in this class is derived from Tor's torgzip.[ch].</span>
<a name="l00013"></a>00013 <span class="comment">** Tor is distributed under this license:</span>
<a name="l00014"></a>00014 <span class="comment">** </span>
<a name="l00015"></a>00015 <span class="comment">** Copyright (c) 2001-2004, Roger Dingledine</span>
<a name="l00016"></a>00016 <span class="comment">** Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson</span>
<a name="l00017"></a>00017 <span class="comment">**</span>
<a name="l00018"></a>00018 <span class="comment">** Redistribution and use in source and binary forms, with or without</span>
<a name="l00019"></a>00019 <span class="comment">** modification, are permitted provided that the following conditions are</span>
<a name="l00020"></a>00020 <span class="comment">** met:</span>
<a name="l00021"></a>00021 <span class="comment">**</span>
<a name="l00022"></a>00022 <span class="comment">** * Redistributions of source code must retain the above copyright</span>
<a name="l00023"></a>00023 <span class="comment">** notice, this list of conditions and the following disclaimer.</span>
<a name="l00024"></a>00024 <span class="comment">**</span>
<a name="l00025"></a>00025 <span class="comment">** * Redistributions in binary form must reproduce the above</span>
<a name="l00026"></a>00026 <span class="comment">** copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00027"></a>00027 <span class="comment">** in the documentation and/or other materials provided with the</span>
<a name="l00028"></a>00028 <span class="comment">** distribution.</span>
<a name="l00029"></a>00029 <span class="comment">** </span>
<a name="l00030"></a>00030 <span class="comment">** * Neither the names of the copyright owners nor the names of its</span>
<a name="l00031"></a>00031 <span class="comment">** contributors may be used to endorse or promote products derived from</span>
<a name="l00032"></a>00032 <span class="comment">** this software without specific prior written permission.</span>
<a name="l00033"></a>00033 <span class="comment">**</span>
<a name="l00034"></a>00034 <span class="comment">** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00035"></a>00035 <span class="comment">** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00036"></a>00036 <span class="comment">** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00037"></a>00037 <span class="comment">** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00038"></a>00038 <span class="comment">** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00039"></a>00039 <span class="comment">** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00040"></a>00040 <span class="comment">** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00041"></a>00041 <span class="comment">** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00042"></a>00042 <span class="comment">** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00043"></a>00043 <span class="comment">** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00044"></a>00044 <span class="comment">** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00045"></a>00045 <span class="comment">*/</span>
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">/*</span>
<a name="l00048"></a>00048 <span class="comment">** \file ZlibByteArray.cpp</span>
<a name="l00049"></a>00049 <span class="comment">** \version $Id: ZlibByteArray.cpp 4203 2010-01-22 18:49:00Z edmanm $</span>
<a name="l00050"></a>00050 <span class="comment">** \brief Wrapper around QByteArray that adds compression capabilities</span>
<a name="l00051"></a>00051 <span class="comment">*/</span>
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="preprocessor">#include "<a class="code" href="config_8h.html">config.h</a>"</span>
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="preprocessor">#include <QString></span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="preprocessor">#ifdef HAVE_LIMITS_H</span>
<a name="l00058"></a>00058 <span class="preprocessor"></span><span class="preprocessor">#include <limits.h></span>
<a name="l00059"></a>00059 <span class="preprocessor">#elif defined(HAVE_SYS_LIMITS_H)</span>
<a name="l00060"></a>00060 <span class="preprocessor"></span><span class="preprocessor">#include <sys/limits.h></span>
<a name="l00061"></a>00061 <span class="preprocessor">#endif</span>
<a name="l00062"></a>00062 <span class="preprocessor"></span>
<a name="l00063"></a>00063 <span class="comment">/* The following check for UINT_MAX is derived from Tor's torint.h. See</span>
<a name="l00064"></a>00064 <span class="comment"> * the top of this file for details on Tor's license. */</span>
<a name="l00065"></a>00065 <span class="preprocessor">#ifndef UINT_MAX</span>
<a name="l00066"></a>00066 <span class="preprocessor"></span><span class="preprocessor">#if (SIZEOF_INT == 2)</span>
<a name="l00067"></a>00067 <span class="preprocessor"></span><span class="preprocessor">#define UINT_MAX 0xffffu</span>
<a name="l00068"></a>00068 <span class="preprocessor"></span><span class="preprocessor">#elif (SIZEOF_INT == 4)</span>
<a name="l00069"></a><a class="code" href="_zlib_byte_array_8cpp.html#ac998ea02fbd821fc123d60445ce76f38">00069</a> <span class="preprocessor"></span><span class="preprocessor">#define UINT_MAX 0xffffffffu</span>
<a name="l00070"></a>00070 <span class="preprocessor"></span><span class="preprocessor">#elif (SIZEOF_INT == 8)</span>
<a name="l00071"></a>00071 <span class="preprocessor"></span><span class="preprocessor">#define UINT_MAX 0xffffffffffffffffu</span>
<a name="l00072"></a>00072 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#error "Your platform uses a sizeof(int) that we don't understand."</span>
<a name="l00074"></a>00074 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00075"></a>00075 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00076"></a>00076 <span class="preprocessor"></span>
<a name="l00077"></a>00077 <span class="preprocessor">#include "<a class="code" href="zlib_8h.html">zlib.h</a>"</span>
<a name="l00078"></a>00078 <span class="preprocessor">#include <<a class="code" href="_zlib_byte_array_8h.html">ZlibByteArray.h</a>></span>
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment"></span>
<a name="l00081"></a>00081 <span class="comment">/** Constructor */</span>
<a name="l00082"></a><a class="code" href="class_zlib_byte_array.html#ab9bb5b8717f1e5046893d92d39b8a196">00082</a> <a class="code" href="class_zlib_byte_array.html#ab9bb5b8717f1e5046893d92d39b8a196">ZlibByteArray::ZlibByteArray</a>(QByteArray data)
<a name="l00083"></a>00083 : QByteArray(data)
<a name="l00084"></a>00084 {
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 <span class="comment"></span>
<a name="l00087"></a>00087 <span class="comment">/** Return the 'bits' value to tell zlib to use <b>method</b>.*/</span>
<a name="l00088"></a>00088 <span class="keywordtype">int</span>
<a name="l00089"></a><a class="code" href="class_zlib_byte_array.html#ac6f657f95a4837de9a8861953fe3c3e7">00089</a> <a class="code" href="class_zlib_byte_array.html#ac6f657f95a4837de9a8861953fe3c3e7">ZlibByteArray::methodBits</a>(<a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 <span class="comment">/* Bits+16 means "use gzip" in zlib >= 1.2 */</span>
<a name="l00092"></a>00092 <span class="keywordflow">return</span> (method == <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a490663b50a0847869c9552cfc044e4b9">Gzip</a> ? 15+16 : 15);
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 <span class="comment"></span>
<a name="l00095"></a>00095 <span class="comment">/** Returns a string description of <b>method</b>. */</span>
<a name="l00096"></a>00096 QString
<a name="l00097"></a><a class="code" href="class_zlib_byte_array.html#aa6e29c8df3104d7c673cbfd6c4f3d518">00097</a> <a class="code" href="class_zlib_byte_array.html#aa6e29c8df3104d7c673cbfd6c4f3d518">ZlibByteArray::methodString</a>(<a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method)
<a name="l00098"></a>00098 {
<a name="l00099"></a>00099 <span class="keywordflow">switch</span> (method) {
<a name="l00100"></a>00100 <span class="keywordflow">case</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a1d5fa2fc1b64a4b1016aafe245aab7c0">None</a>: <span class="keywordflow">return</span> <span class="stringliteral">"None"</span>;
<a name="l00101"></a>00101 <span class="keywordflow">case</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8aa75b917f01fab061c7d581f7ada4fff0">Zlib</a>: <span class="keywordflow">return</span> <span class="stringliteral">"Zlib"</span>;
<a name="l00102"></a>00102 <span class="keywordflow">case</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a490663b50a0847869c9552cfc044e4b9">Gzip</a>: <span class="keywordflow">return</span> <span class="stringliteral">"Gzip"</span>;
<a name="l00103"></a>00103 <span class="keywordflow">default</span>: <span class="keywordflow">return</span> <span class="stringliteral">"Unknown"</span>;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 <span class="comment"></span>
<a name="l00107"></a>00107 <span class="comment">/** Returns true if the Zlib compression library is available and usable. */</span>
<a name="l00108"></a>00108 <span class="keywordtype">bool</span>
<a name="l00109"></a><a class="code" href="class_zlib_byte_array.html#a6c5229cfbc848bb00dc872b17b854336">00109</a> <a class="code" href="class_zlib_byte_array.html#a6c5229cfbc848bb00dc872b17b854336">ZlibByteArray::isZlibAvailable</a>()
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="class_zlib_byte_array.html#a6c5229cfbc848bb00dc872b17b854336">isZlibAvailable</a> = -1;
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (isZlibAvailable >= 0)
<a name="l00113"></a>00113 <span class="keywordflow">return</span> isZlibAvailable;
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">/* From zlib.h:</span>
<a name="l00116"></a>00116 <span class="comment"> * "The application can compare zlibVersion and ZLIB_VERSION for consistency.</span>
<a name="l00117"></a>00117 <span class="comment"> * If the first character differs, the library code actually used is</span>
<a name="l00118"></a>00118 <span class="comment"> * not compatible with the zlib.h header file used by the application." */</span>
<a name="l00119"></a>00119 QString libVersion(zlibVersion());
<a name="l00120"></a>00120 QString headerVersion(<a class="code" href="zlib_8h.html#a51dc9dc65e483b3222c1f0f6a87eb76e">ZLIB_VERSION</a>);
<a name="l00121"></a>00121 <span class="keywordflow">if</span> (libVersion.isEmpty() || headerVersion.isEmpty() ||
<a name="l00122"></a>00122 libVersion.at(0) != headerVersion.at(0))
<a name="l00123"></a>00123 isZlibAvailable = 0;
<a name="l00124"></a>00124 <span class="keywordflow">else</span>
<a name="l00125"></a>00125 isZlibAvailable = 1;
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keywordflow">return</span> isZlibAvailable;
<a name="l00128"></a>00128 }
<a name="l00129"></a>00129 <span class="comment"></span>
<a name="l00130"></a>00130 <span class="comment">/** Returns true iff we support gzip-based compression. Otherwise, we need to</span>
<a name="l00131"></a>00131 <span class="comment"> * use zlib. */</span>
<a name="l00132"></a>00132 <span class="keywordtype">bool</span>
<a name="l00133"></a><a class="code" href="class_zlib_byte_array.html#ab4af714f053c78d6ad848dc71e994562">00133</a> <a class="code" href="class_zlib_byte_array.html#ab4af714f053c78d6ad848dc71e994562">ZlibByteArray::isGzipSupported</a>()
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135 <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="class_zlib_byte_array.html#ab4af714f053c78d6ad848dc71e994562">isGzipSupported</a> = -1;
<a name="l00136"></a>00136 <span class="keywordflow">if</span> (isGzipSupported >= 0)
<a name="l00137"></a>00137 <span class="keywordflow">return</span> isGzipSupported;
<a name="l00138"></a>00138
<a name="l00139"></a>00139 QString version(zlibVersion());
<a name="l00140"></a>00140 <span class="keywordflow">if</span> (version.startsWith(<span class="stringliteral">"0."</span>) ||
<a name="l00141"></a>00141 version.startsWith(<span class="stringliteral">"1.0"</span>) ||
<a name="l00142"></a>00142 version.startsWith(<span class="stringliteral">"1.1"</span>))
<a name="l00143"></a>00143 isGzipSupported = 0;
<a name="l00144"></a>00144 <span class="keywordflow">else</span>
<a name="l00145"></a>00145 isGzipSupported = 1;
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keywordflow">return</span> isGzipSupported;
<a name="l00148"></a>00148 }
<a name="l00149"></a>00149 <span class="comment"></span>
<a name="l00150"></a>00150 <span class="comment">/** Compresses the current contents of this object using <b>method</b>. </span>
<a name="l00151"></a>00151 <span class="comment"> * Returns the compressed data if successful. If an error occurs, this will </span>
<a name="l00152"></a>00152 <span class="comment"> * return an empty QByteArray and set the optional <b>errmsg</b> to a string </span>
<a name="l00153"></a>00153 <span class="comment"> * describing the failure. */</span>
<a name="l00154"></a>00154 QByteArray
<a name="l00155"></a><a class="code" href="class_zlib_byte_array.html#a8c394c120b7786aa57a86ce537eb8d36">00155</a> <a class="code" href="class_zlib_byte_array.html#a8c394c120b7786aa57a86ce537eb8d36">ZlibByteArray::compress</a>(<span class="keyword">const</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method,
<a name="l00156"></a>00156 QString *errmsg)<span class="keyword"> const</span>
<a name="l00157"></a>00157 <span class="keyword"></span>{
<a name="l00158"></a>00158 <span class="keywordflow">return</span> <a class="code" href="class_zlib_byte_array.html#a8c394c120b7786aa57a86ce537eb8d36">compress</a>(QByteArray(data()), method, errmsg);
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160 <span class="comment"></span>
<a name="l00161"></a>00161 <span class="comment">/** Compresses <b>in</b> using <b>method</b>. Returns the compressed data</span>
<a name="l00162"></a>00162 <span class="comment"> * if successful. If an error occurs, this will return an empty QByteArray and</span>
<a name="l00163"></a>00163 <span class="comment"> * set the optional <b>errmsg</b> to a string describing the failure. */</span>
<a name="l00164"></a>00164 QByteArray
<a name="l00165"></a><a class="code" href="class_zlib_byte_array.html#a6564717e99cc9609f097771b92a3eb97">00165</a> <a class="code" href="class_zlib_byte_array.html#a8c394c120b7786aa57a86ce537eb8d36">ZlibByteArray::compress</a>(<span class="keyword">const</span> QByteArray in,
<a name="l00166"></a>00166 <span class="keyword">const</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method,
<a name="l00167"></a>00167 QString *errmsg)
<a name="l00168"></a>00168 {
<a name="l00169"></a>00169 QByteArray out;
<a name="l00170"></a>00170 QString errorstr;
<a name="l00171"></a>00171 <span class="keyword">struct </span><a class="code" href="structz__stream__s.html">z_stream_s</a> *stream = NULL;
<a name="l00172"></a>00172 <span class="keywordtype">size_t</span> out_size;
<a name="l00173"></a>00173 <span class="keywordtype">size_t</span> out_len;
<a name="l00174"></a>00174 <span class="keywordtype">size_t</span> in_len = in.length();
<a name="l00175"></a>00175 off_t offset;
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keywordflow">if</span> (method == <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a1d5fa2fc1b64a4b1016aafe245aab7c0">None</a>)
<a name="l00178"></a>00178 <span class="keywordflow">return</span> in;
<a name="l00179"></a>00179 <span class="keywordflow">if</span> (method == <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a490663b50a0847869c9552cfc044e4b9">Gzip</a> && !<a class="code" href="class_zlib_byte_array.html#ab4af714f053c78d6ad848dc71e994562">isGzipSupported</a>()) {
<a name="l00180"></a>00180 <span class="comment">/* Old zlib versions don't support gzip in deflateInit2 */</span>
<a name="l00181"></a>00181 <span class="keywordflow">if</span> (errmsg)
<a name="l00182"></a>00182 *errmsg = QString(<span class="stringliteral">"Gzip not supported with zlib %1"</span>)
<a name="l00183"></a>00183 .arg(<a class="code" href="zlib_8h.html#a51dc9dc65e483b3222c1f0f6a87eb76e">ZLIB_VERSION</a>);
<a name="l00184"></a>00184 <span class="keywordflow">return</span> QByteArray();
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186
<a name="l00187"></a>00187 stream = <span class="keyword">new</span> <span class="keyword">struct </span><a class="code" href="structz__stream__s.html">z_stream_s</a>;
<a name="l00188"></a>00188 stream-><a class="code" href="structz__stream__s.html#a23a2299c384f808e76e9908f21216b0f">zalloc</a> = <a class="code" href="zlib_8h.html#ad15afa2776b41b2f4d8582dd152bd736">Z_NULL</a>;
<a name="l00189"></a>00189 stream-><a class="code" href="structz__stream__s.html#a89eb750ade7f4f0b56bfdadf13344982">zfree</a> = <a class="code" href="zlib_8h.html#ad15afa2776b41b2f4d8582dd152bd736">Z_NULL</a>;
<a name="l00190"></a>00190 stream-><a class="code" href="structz__stream__s.html#ab72467f908d2ce65d5b42ee6556ef8bb">opaque</a> = NULL;
<a name="l00191"></a>00191 stream-><a class="code" href="structz__stream__s.html#a21d2c026f0f2fcd67f33011231f8ed00">next_in</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)in.data();
<a name="l00192"></a>00192 stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a> = in_len;
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="keywordflow">if</span> (<a class="code" href="zlib_8h.html#a59b575a521efe7ea0d3b9dd3c8d315c1">deflateInit2</a>(stream, <a class="code" href="zlib_8h.html#a8db83edd9dea51f8cf0afd1727838b95">Z_BEST_COMPRESSION</a>, <a class="code" href="zlib_8h.html#a27a96226f3dc88e4743131c632adf32f">Z_DEFLATED</a>,
<a name="l00195"></a>00195 <a class="code" href="class_zlib_byte_array.html#ac6f657f95a4837de9a8861953fe3c3e7">methodBits</a>(method),
<a name="l00196"></a>00196 8, <a class="code" href="zlib_8h.html#a580d7c2527e653ddd783109271750849">Z_DEFAULT_STRATEGY</a>) != <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00197"></a>00197 errorstr = QString(<span class="stringliteral">"Error from deflateInit2: %1"</span>)
<a name="l00198"></a>00198 .arg(stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> ? stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> : <span class="stringliteral">"<no message>"</span>);
<a name="l00199"></a>00199 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="comment">/* Guess 50% compression. */</span>
<a name="l00203"></a>00203 out_size = in_len / 2;
<a name="l00204"></a>00204 <span class="keywordflow">if</span> (out_size < 1024) out_size = 1024;
<a name="l00205"></a>00205
<a name="l00206"></a>00206 out.resize(out_size);
<a name="l00207"></a>00207 stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)out.data();
<a name="l00208"></a>00208 stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> = out_size;
<a name="l00209"></a>00209
<a name="l00210"></a>00210 <span class="keywordflow">while</span> (1) {
<a name="l00211"></a>00211 <span class="keywordflow">switch</span> (deflate(stream, <a class="code" href="zlib_8h.html#a876a626ba14eb12eea4bbf6823b6ca50">Z_FINISH</a>))
<a name="l00212"></a>00212 {
<a name="l00213"></a>00213 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a7d94a4a852228a899864a0053162e7a8">Z_STREAM_END</a>:
<a name="l00214"></a>00214 <span class="keywordflow">goto</span> done;
<a name="l00215"></a>00215 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>:
<a name="l00216"></a>00216 <span class="comment">/* In case zlib doesn't work as I think .... */</span>
<a name="l00217"></a>00217 <span class="keywordflow">if</span> (stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> >= stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a>+16)
<a name="l00218"></a>00218 <span class="keywordflow">break</span>;
<a name="l00219"></a>00219 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a425e2f0664e1b1f75bf2bffab88d353d">Z_BUF_ERROR</a>:
<a name="l00220"></a>00220 offset = stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> - ((<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)out.data());
<a name="l00221"></a>00221 out_size *= 2;
<a name="l00222"></a>00222 out.resize(out_size);
<a name="l00223"></a>00223 stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)(out.data() + offset);
<a name="l00224"></a>00224 <span class="keywordflow">if</span> (out_size - offset > <a class="code" href="_zlib_byte_array_8cpp.html#ac998ea02fbd821fc123d60445ce76f38">UINT_MAX</a>) {
<a name="l00225"></a>00225 errorstr =
<a name="l00226"></a>00226 <span class="stringliteral">"Ran over unsigned int limit of zlib while uncompressing"</span>;
<a name="l00227"></a>00227 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229 stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> = (<span class="keywordtype">unsigned</span> int)(out_size - offset);
<a name="l00230"></a>00230 <span class="keywordflow">break</span>;
<a name="l00231"></a>00231 <span class="keywordflow">default</span>:
<a name="l00232"></a>00232 errorstr = QString(<span class="stringliteral">"%1 compression didn't finish: %2"</span>)
<a name="l00233"></a>00233 .arg(<a class="code" href="class_zlib_byte_array.html#aa6e29c8df3104d7c673cbfd6c4f3d518">methodString</a>(method))
<a name="l00234"></a>00234 .arg(stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> ? stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> : <span class="stringliteral">"<no message>"</span>);
<a name="l00235"></a>00235 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00236"></a>00236 }
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238 done:
<a name="l00239"></a>00239 out_len = stream-><a class="code" href="structz__stream__s.html#abae26f1f236cf920250b9d37fdf009c1">total_out</a>;
<a name="l00240"></a>00240 <span class="keywordflow">if</span> (deflateEnd(stream)!=<a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00241"></a>00241 errorstr = <span class="stringliteral">"Error freeing zlib structures"</span>;
<a name="l00242"></a>00242 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00243"></a>00243 }
<a name="l00244"></a>00244 out.resize(out_len);
<a name="l00245"></a>00245 <span class="keyword">delete</span> stream;
<a name="l00246"></a>00246 <span class="keywordflow">return</span> out;
<a name="l00247"></a>00247 <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>:
<a name="l00248"></a>00248 <span class="keywordflow">if</span> (stream) {
<a name="l00249"></a>00249 deflateEnd(stream);
<a name="l00250"></a>00250 <span class="keyword">delete</span> stream;
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252 <span class="keywordflow">if</span> (errmsg)
<a name="l00253"></a>00253 *errmsg = errorstr;
<a name="l00254"></a>00254 <span class="keywordflow">return</span> QByteArray();
<a name="l00255"></a>00255 }
<a name="l00256"></a>00256 <span class="comment"></span>
<a name="l00257"></a>00257 <span class="comment">/** Uncompresses the current contents of this object using <b>method</b>. </span>
<a name="l00258"></a>00258 <span class="comment"> * Returns the uncompressed data if successful. If an error occurs, this will </span>
<a name="l00259"></a>00259 <span class="comment"> * return an empty QByteArray and set the optional <b>errmsg</b> to a string </span>
<a name="l00260"></a>00260 <span class="comment"> * describing the failure. */</span>
<a name="l00261"></a>00261 QByteArray
<a name="l00262"></a><a class="code" href="class_zlib_byte_array.html#ab4c372a4c90e50d98460f624ec468654">00262</a> <a class="code" href="class_zlib_byte_array.html#ab4c372a4c90e50d98460f624ec468654">ZlibByteArray::uncompress</a>(<span class="keyword">const</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method,
<a name="l00263"></a>00263 QString *errmsg)<span class="keyword"> const</span>
<a name="l00264"></a>00264 <span class="keyword"></span>{
<a name="l00265"></a>00265 <span class="keywordflow">return</span> <a class="code" href="class_zlib_byte_array.html#ab4c372a4c90e50d98460f624ec468654">uncompress</a>(QByteArray(data()), method, errmsg);
<a name="l00266"></a>00266 }
<a name="l00267"></a>00267 <span class="comment"></span>
<a name="l00268"></a>00268 <span class="comment">/** Uncompresses <b>in</b> using <b>method</b>. Returns the uncompressed data</span>
<a name="l00269"></a>00269 <span class="comment"> * if successful. If an error occurs, this will return an empty QByteArray and</span>
<a name="l00270"></a>00270 <span class="comment"> * set the optional <b>errmsg</b> to a string describing the failure. */</span>
<a name="l00271"></a>00271 QByteArray
<a name="l00272"></a><a class="code" href="class_zlib_byte_array.html#a806b5627b377b6d8334ce8534b328388">00272</a> <a class="code" href="class_zlib_byte_array.html#ab4c372a4c90e50d98460f624ec468654">ZlibByteArray::uncompress</a>(<span class="keyword">const</span> QByteArray in,
<a name="l00273"></a>00273 <span class="keyword">const</span> <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8">CompressionMethod</a> method,
<a name="l00274"></a>00274 QString *errmsg)
<a name="l00275"></a>00275 {
<a name="l00276"></a>00276 QByteArray out;
<a name="l00277"></a>00277 QString errorstr;
<a name="l00278"></a>00278 <span class="keyword">struct </span><a class="code" href="structz__stream__s.html">z_stream_s</a> *stream = NULL;
<a name="l00279"></a>00279 <span class="keywordtype">size_t</span> out_size;
<a name="l00280"></a>00280 <span class="keywordtype">size_t</span> out_len;
<a name="l00281"></a>00281 <span class="keywordtype">size_t</span> in_len = in.length();
<a name="l00282"></a>00282 off_t offset;
<a name="l00283"></a>00283 <span class="keywordtype">int</span> r;
<a name="l00284"></a>00284
<a name="l00285"></a>00285 <span class="keywordflow">if</span> (method == <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a1d5fa2fc1b64a4b1016aafe245aab7c0">None</a>)
<a name="l00286"></a>00286 <span class="keywordflow">return</span> in;
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (method == <a class="code" href="class_zlib_byte_array.html#a795e65533557fce60a4f5646b2daebe8a490663b50a0847869c9552cfc044e4b9">Gzip</a> && !<a class="code" href="class_zlib_byte_array.html#ab4af714f053c78d6ad848dc71e994562">isGzipSupported</a>()) {
<a name="l00288"></a>00288 <span class="comment">/* Old zlib versions don't support gzip in inflateInit2 */</span>
<a name="l00289"></a>00289 <span class="keywordflow">if</span> (errmsg)
<a name="l00290"></a>00290 *errmsg = QString(<span class="stringliteral">"Gzip not supported with zlib %1"</span>)
<a name="l00291"></a>00291 .arg(<a class="code" href="zlib_8h.html#a51dc9dc65e483b3222c1f0f6a87eb76e">ZLIB_VERSION</a>);
<a name="l00292"></a>00292 <span class="keywordflow">return</span> QByteArray();
<a name="l00293"></a>00293 }
<a name="l00294"></a>00294
<a name="l00295"></a>00295 stream = <span class="keyword">new</span> <span class="keyword">struct </span><a class="code" href="structz__stream__s.html">z_stream_s</a>;
<a name="l00296"></a>00296 stream-><a class="code" href="structz__stream__s.html#a23a2299c384f808e76e9908f21216b0f">zalloc</a> = <a class="code" href="zlib_8h.html#ad15afa2776b41b2f4d8582dd152bd736">Z_NULL</a>;
<a name="l00297"></a>00297 stream-><a class="code" href="structz__stream__s.html#a89eb750ade7f4f0b56bfdadf13344982">zfree</a> = <a class="code" href="zlib_8h.html#ad15afa2776b41b2f4d8582dd152bd736">Z_NULL</a>;
<a name="l00298"></a>00298 stream-><a class="code" href="structz__stream__s.html#ab72467f908d2ce65d5b42ee6556ef8bb">opaque</a> = NULL;
<a name="l00299"></a>00299 stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> = NULL;
<a name="l00300"></a>00300 stream-><a class="code" href="structz__stream__s.html#a21d2c026f0f2fcd67f33011231f8ed00">next_in</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*) in.data();
<a name="l00301"></a>00301 stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a> = in_len;
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordflow">if</span> (<a class="code" href="zlib_8h.html#a611fc206e69f34e812ca8b590982fdd5">inflateInit2</a>(stream,
<a name="l00304"></a>00304 <a class="code" href="class_zlib_byte_array.html#ac6f657f95a4837de9a8861953fe3c3e7">methodBits</a>(method)) != <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00305"></a>00305 errorstr = QString(<span class="stringliteral">"Error from inflateInit2: %1"</span>)
<a name="l00306"></a>00306 .arg(stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> ? stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> : <span class="stringliteral">"<no message>"</span>);
<a name="l00307"></a>00307 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00308"></a>00308 }
<a name="l00309"></a>00309
<a name="l00310"></a>00310 out_size = in_len * 2; <span class="comment">/* guess 50% compression. */</span>
<a name="l00311"></a>00311 <span class="keywordflow">if</span> (out_size < 1024) out_size = 1024;
<a name="l00312"></a>00312
<a name="l00313"></a>00313 out.resize(out_size);
<a name="l00314"></a>00314 stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)out.data();
<a name="l00315"></a>00315 stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> = out_size;
<a name="l00316"></a>00316
<a name="l00317"></a>00317 <span class="keywordflow">while</span> (1) {
<a name="l00318"></a>00318 <span class="keywordflow">switch</span> (inflate(stream, <a class="code" href="zlib_8h.html#a876a626ba14eb12eea4bbf6823b6ca50">Z_FINISH</a>))
<a name="l00319"></a>00319 {
<a name="l00320"></a>00320 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a7d94a4a852228a899864a0053162e7a8">Z_STREAM_END</a>:
<a name="l00321"></a>00321 <span class="keywordflow">if</span> (stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a> == 0)
<a name="l00322"></a>00322 <span class="keywordflow">goto</span> done;
<a name="l00323"></a>00323 <span class="comment">/* There may be more compressed data here. */</span>
<a name="l00324"></a>00324 <span class="keywordflow">if</span> ((r = inflateEnd(stream)) != <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00325"></a>00325 errorstr = <span class="stringliteral">"Error freeing zlib structures"</span>;
<a name="l00326"></a>00326 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00327"></a>00327 }
<a name="l00328"></a>00328 <span class="keywordflow">if</span> (<a class="code" href="zlib_8h.html#a611fc206e69f34e812ca8b590982fdd5">inflateInit2</a>(stream, <a class="code" href="class_zlib_byte_array.html#ac6f657f95a4837de9a8861953fe3c3e7">methodBits</a>(method)) != <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00329"></a>00329 errorstr = QString(<span class="stringliteral">"Error from second inflateInit2: %1"</span>)
<a name="l00330"></a>00330 .arg(stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> ? stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> : <span class="stringliteral">"<no message>"</span>);
<a name="l00331"></a>00331 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00332"></a>00332 }
<a name="l00333"></a>00333 <span class="keywordflow">break</span>;
<a name="l00334"></a>00334 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>:
<a name="l00335"></a>00335 <span class="keywordflow">if</span> (stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a> == 0)
<a name="l00336"></a>00336 <span class="keywordflow">goto</span> done;
<a name="l00337"></a>00337 <span class="comment">/* In case zlib doesn't work as I think.... */</span>
<a name="l00338"></a>00338 <span class="keywordflow">if</span> (stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> >= stream-><a class="code" href="structz__stream__s.html#a0cf177f50dbb49692f27480cbcfde794">avail_in</a>+16)
<a name="l00339"></a>00339 <span class="keywordflow">break</span>;
<a name="l00340"></a>00340 <span class="keywordflow">case</span> <a class="code" href="zlib_8h.html#a425e2f0664e1b1f75bf2bffab88d353d">Z_BUF_ERROR</a>:
<a name="l00341"></a>00341 <span class="keywordflow">if</span> (stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> > 0) {
<a name="l00342"></a>00342 errorstr = QString(<span class="stringliteral">"Possible truncated or corrupt %1 data"</span>)
<a name="l00343"></a>00343 .arg(<a class="code" href="class_zlib_byte_array.html#aa6e29c8df3104d7c673cbfd6c4f3d518">methodString</a>(method));
<a name="l00344"></a>00344 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00345"></a>00345 }
<a name="l00346"></a>00346 offset = stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> - (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)out.data();
<a name="l00347"></a>00347 out_size *= 2;
<a name="l00348"></a>00348 out.resize(out_size);
<a name="l00349"></a>00349 stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)(out.data() + offset);
<a name="l00350"></a>00350 <span class="keywordflow">if</span> (out_size - offset > <a class="code" href="_zlib_byte_array_8cpp.html#ac998ea02fbd821fc123d60445ce76f38">UINT_MAX</a>) {
<a name="l00351"></a>00351 errorstr =
<a name="l00352"></a>00352 <span class="stringliteral">"Ran over unsigned int limit of zlib while uncompressing"</span>;
<a name="l00353"></a>00353 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00354"></a>00354 }
<a name="l00355"></a>00355 stream-><a class="code" href="structz__stream__s.html#a45ad2364307af9d944fd39d4eca3ca3c">avail_out</a> = (<span class="keywordtype">unsigned</span> int)(out_size - offset);
<a name="l00356"></a>00356 <span class="keywordflow">break</span>;
<a name="l00357"></a>00357 <span class="keywordflow">default</span>:
<a name="l00358"></a>00358 errorstr = QString(<span class="stringliteral">"%1 decompression returned an error: %2"</span>)
<a name="l00359"></a>00359 .arg(<a class="code" href="class_zlib_byte_array.html#aa6e29c8df3104d7c673cbfd6c4f3d518">methodString</a>(method))
<a name="l00360"></a>00360 .arg(stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> ? stream-><a class="code" href="structz__stream__s.html#a9b2f745fc780e3b33e2935f8c650a326">msg</a> : <span class="stringliteral">"<no message>"</span>);
<a name="l00361"></a>00361 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00362"></a>00362 }
<a name="l00363"></a>00363 }
<a name="l00364"></a>00364 done:
<a name="l00365"></a>00365 out_len = stream-><a class="code" href="structz__stream__s.html#aed4a02cfe93e975314fed50b04427bf3">next_out</a> - (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)out.data();
<a name="l00366"></a>00366 r = inflateEnd(stream);
<a name="l00367"></a>00367 <span class="keyword">delete</span> stream;
<a name="l00368"></a>00368 <span class="keywordflow">if</span> (r != <a class="code" href="zlib_8h.html#a8cb802b6a11e926478dc6547c514c65c">Z_OK</a>) {
<a name="l00369"></a>00369 errorstr = <span class="stringliteral">"Error freeing zlib structure"</span>;
<a name="l00370"></a>00370 <span class="keywordflow">goto</span> <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>;
<a name="l00371"></a>00371 }
<a name="l00372"></a>00372 out.resize(out_len);
<a name="l00373"></a>00373 <span class="keywordflow">return</span> out;
<a name="l00374"></a>00374 <a class="code" href="stringutil_8cpp.html#a6e3f242b28c9165146182aec25e351a3">err</a>:
<a name="l00375"></a>00375 <span class="keywordflow">if</span> (stream) {
<a name="l00376"></a>00376 inflateEnd(stream);
<a name="l00377"></a>00377 <span class="keyword">delete</span> stream;
<a name="l00378"></a>00378 }
<a name="l00379"></a>00379 <span class="keywordflow">if</span> (errmsg)
<a name="l00380"></a>00380 *errmsg = errorstr;
<a name="l00381"></a>00381 <span class="keywordflow">return</span> QByteArray();
<a name="l00382"></a>00382 }
<a name="l00383"></a>00383
</pre></div></div>
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