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+ <title>eVaf Tutorial - 04 - Generator Module</title>
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+ <h1>eVaf Tutorial</h1>
+
+ <h2>04 - Generator Module</h2>
+
+ <p>Now we are going to implement all the classes declared in the <tt>module.h</tt>. Create the <tt>module.cpp</tt> file
+ in the <tt>src/apps/PswGen/Generator</tt> directory. We obviously include the <tt>module.h</tt> header file, but also
+ the <tt>QtCore</tt> header file for any non-GUI Qt classes.</p>
+
+<pre class="hl"><span class="hl com">/**</span>
+<span class="hl com"> * @file src/apps/PswGen/Generator/module.cpp</span>
+<span class="hl com"> */</span>
+
+<span class="hl ppc">#include</span> <span class="hl pps">"module.h"</span><span class="hl ppc"></span>
+
+<span class="hl ppc">#include <QtCore></span></pre>
+
+ <p>All the eVaf modules need to include version information. This is common for all the modules and we can simply
+ copy existing version info files from another eVaf module:</p>
+
+ <pre>evaf/src/apps/PswGen/Generator $ <code>cp ../../../plugins/SdiWindow/version.{h,rc} .</code></pre>
+
+ <p>The <tt>version.h</tt> file contains version information for the module. The <tt>version.rc</tt> is for Windows
+ builds only and embeds the same version information into the dll or exe file. Modify the copied <tt>version.h</tt>
+ file for our new module. The <tt>version.rc</tt> file uses the values from the <tt>version.h</tt> and does not
+ need to be touched.</p>
+
+<pre class="hl"><span class="hl com">/**</span>
+<span class="hl com"> * @file src/apps/PswGen/Generator/version.h</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#ifndef __PSWGEN_GENERATOR_VERSION_H</span>
+<span class="hl ppc">#define __PSWGEN_GENERATOR_VERSION_H</span>
+
+<span class="hl ppc">#include <version_rc.h></span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Module/library version number in the form major,minor,release,build</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_FILE_VERSION 0,1,1,1</span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Module/library version number in the string format (shall end with \0)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_FILE_VERSION_STR</span> <span class="hl pps">"0.1.1.1\0"</span><span class="hl ppc"></span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Module/library name (shall end with \0)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_MODULE_NAME_STR</span> <span class="hl pps">"PswGen\0"</span><span class="hl ppc"></span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Module type (see version_rc.h for all the types)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_MODULE_TYPE MT_GENERIC</span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Module type in the string format (see version_rc for all the types)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_MODULE_TYPE_STR MT_GENERIC</span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Original file name for windows (shall end with \0)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_ORIGINAL_FILE_NAME_STR</span> <span class="hl pps">"PswGen.dll\0"</span><span class="hl ppc"></span>
+
+<span class="hl com">/**</span>
+<span class="hl com"> * Description of the module/library (shall end with \0)</span>
+<span class="hl com"> */</span>
+<span class="hl ppc">#define VER_FILE_DESCRIPTION_STR</span> <span class="hl pps">"Module that generates strong passwords using MD5 hashes.\0"</span><span class="hl ppc"></span>
+
+<span class="hl ppc">#endif</span> <span class="hl slc">// version.h</span><span class="hl ppc"></span></pre>
+
+ <p>Then include the version info file in the <tt>module.cpp</tt> file and use the <tt>VER_EXPORT_VERSION_INFO()</tt> macro
+ to export version information from the module. This macro defines a public function that all the eVaf modules export and
+ is used to collect version information from them. In your modules you only need to modify the <tt>version.h</tt> file and then
+ use the <tt>VER_EXPORT_VERSION_INFO()</tt> macro once somewhere in your code.</p>
+
+<pre class="hl"><span class="hl ppc">#include</span> <span class="hl pps">"version.h"</span><span class="hl ppc"></span>
+
+<span class="hl kwd">VER_EXPORT_VERSION_INFO</span><span class="hl opt">()</span></pre>
+
+ <p>We make our life easier with several <tt>using namespace</tt> keywords:</p>
+
+<pre class="hl"><span class="hl kwa">using namespace</span> eVaf<span class="hl opt">;</span>
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">;</span>
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">::</span>Generator<span class="hl opt">;</span></pre>
+
+ <p>The Module class needs to instantiate the <tt>iGenerator</tt> interface in the constructor. We also need to set
+ the QObject's name property to the name of the plugin by combining the name of the module with the name of the class.
+ While the application would work without the name property, it makes our life much easier if the name property is set.</p>
+
+ <p>Finally, we output an info message telling that the object was created. Every eVaf module and class is expected to
+ output info messages when they are created, destroyed, initialized or destroyed.</p>
+
+<pre class="hl">Module<span class="hl opt">::</span><span class="hl kwd">Module</span><span class="hl opt">()</span>
+ <span class="hl opt">:</span> Plugins<span class="hl opt">::</span><span class="hl kwd">iPlugin</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">setObjectName</span><span class="hl opt">(</span><span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1.%2"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>VER_MODULE_NAME_STR<span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>__FUNCTION__<span class="hl opt">));</span>
+
+ mGenerator <span class="hl opt">=</span> <span class="hl kwa">new</span> Internal<span class="hl opt">::</span>GeneratorImpl<span class="hl opt">;</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s created"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span></pre>
+
+ <p>The <tt>EVAF_INFO</tt> macro comes from the <tt>Common/iLogger</tt> header file ane we need to include it:</p>
+
+<pre class="hl"><span class="hl ppc">#include <Common/iLogger></span></pre>
+
+ <p>The destructor should delete the <tt>iGenerator</tt> interface object, which we created in the constructor. The common
+ rule is that any resources allocated in the constructor shall be released in the destructor, preferrably in the opposite
+ order, ie. the first resource allocated in the constructor is released last in the destructor.</tt>
+
+<pre class="hl">Module<span class="hl opt">::~</span><span class="hl kwd">Module</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwa">delete</span> mGenerator<span class="hl opt">;</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s destroyed"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span></pre>
+
+ <p>We also need to implement <tt>init()</tt> and <tt>done()</tt> functions, which are used to initialize and finalize modules.
+ They are similar to the constructor and destructor with two major differences:</p>
+ <ol>
+ <li>The <tt>init()</tt> function can fail and return <tt>false</tt> to indicate a failure. eVaf does not use exceptions and
+ this is the only way for a module to fail without terminating the whole application. A failed module will be disabled
+ and the rest of the application can still run if it can.</li>
+ <li>eVaf modules are loaded in two steps. At first, all the modules are created, which means that all the objects
+ are constructed. Only then will eVaf call <tt>init()</tt> functions meaning that when the <tt>init()</tt> function is
+ called, all the modules are already loaded and instantiated. Interfaces and resources from other modules that might be not
+ available when the object is created, are available when the <tt>init()</tt> function is called.</li>
+ </ol>
+
+ <p>The rule for <tt>init()</tt> and <tt>done()</tt> functions is the same than for constructors and destructors -- any resource
+ allocated in the <tt>init()</tt> function shall be released in the <tt>done()</tt> function and preferrably in the opposite
+ order.</p>
+
+ <p>This simple module needs no extra resources to be allocated and our <tt>init()</tt> and <tt>done()</tt> functions can be
+ the following:</p>
+
+<pre class="hl"><span class="hl kwb">bool</span> Module<span class="hl opt">::</span><span class="hl kwd">init</span><span class="hl opt">(</span>QString <span class="hl kwb">const</span> <span class="hl opt">&</span> args<span class="hl opt">)</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">Q_UNUSED</span><span class="hl opt">(</span>args<span class="hl opt">);</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s initialized"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+
+ <span class="hl kwa">return true</span><span class="hl opt">;</span>
+<span class="hl opt">}</span>
+
+<span class="hl kwb">void</span> Module<span class="hl opt">::</span><span class="hl kwd">done</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s finalized"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span></pre>
+
+ <p>We continue by implementing the <tt>iGenerator</tt> interface. There are no resources to be allocated in the constructor
+ and we just set the QObject's name property and output the info message.</p>
+
+ <p>We also register the <tt>iGenerator</tt> interface in the global registry so that other modules can query for it and
+ use our interface. This is done by using the <tt>Common::iRegistry</tt> interface, which we need to include:</p>
+
+<pre class="hl"><span class="hl ppc">#include <Common/iRegistry></span></pre>
+
+ <p>The <tt>GeneratorImpl</tt> class was declared in the <tt>eVaf::PswGen::Generator::Internal</tt> namespace, so we need
+ another <tt>using namespace</tt> keyword before the implementation of the class:</p>
+
+<pre class="hl"><span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">::</span>Generator<span class="hl opt">::</span>Internal<span class="hl opt">;</span>
+
+GeneratorImpl<span class="hl opt">::</span><span class="hl kwd">GeneratorImpl</span><span class="hl opt">()</span>
+ <span class="hl opt">:</span> <span class="hl kwd">iGenerator</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">setObjectName</span><span class="hl opt">(</span><span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1.iGenerator"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>VER_MODULE_NAME_STR<span class="hl opt">));</span>
+
+ Common<span class="hl opt">::</span>iRegistry<span class="hl opt">::</span><span class="hl kwd">instance</span><span class="hl opt">()-></span><span class="hl kwd">registerInterface</span><span class="hl opt">(</span><span class="hl str">"iGenerator"</span><span class="hl opt">,</span> <span class="hl kwa">this</span><span class="hl opt">);</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s created"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+GeneratorImpl<span class="hl opt">::~</span><span class="hl kwd">GeneratorImpl</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s destroyed"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span></pre>
+
+ <p>Finally, we write the <tt>generatePassword</tt> function that does the actual job of the module.</p>
+
+ <p>We use the MD5 cryptographic hash function to calculate a hash value over the <tt>name</tt> and <tt>masterPassword</tt> values.
+ The result, which is a binary blob, needs to be convert into something that can be used as a password and we use base 64 encoding
+ for this and cut the result to the requested length:</p>
+
+<pre class="hl">QString GeneratorImpl<span class="hl opt">::</span><span class="hl kwd">generatePassword</span><span class="hl opt">(</span>QString <span class="hl kwb">const</span> <span class="hl opt">&</span> name<span class="hl opt">,</span> QString <span class="hl kwb">const</span> <span class="hl opt">&</span> masterPassword<span class="hl opt">,</span> <span class="hl kwb">int</span> length<span class="hl opt">,</span> uint flags<span class="hl opt">)</span> <span class="hl kwb">const</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">Q_UNUSED</span><span class="hl opt">(</span>flags<span class="hl opt">);</span>
+
+ QByteArray inputString <span class="hl opt">=</span> <span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1%2"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>name<span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>masterPassword<span class="hl opt">).</span><span class="hl kwd">toLatin1</span><span class="hl opt">();</span>
+ QCryptographicHash <span class="hl kwd">hash</span><span class="hl opt">(</span>QCryptographicHash<span class="hl opt">::</span>Md5<span class="hl opt">);</span>
+ hash<span class="hl opt">.</span><span class="hl kwd">addData</span><span class="hl opt">(</span>inputString<span class="hl opt">);</span>
+ QByteArray result <span class="hl opt">=</span> hash<span class="hl opt">.</span><span class="hl kwd">result</span><span class="hl opt">().</span><span class="hl kwd">toBase64</span><span class="hl opt">();</span>
+ <span class="hl kwa">if</span> <span class="hl opt">(</span>length <span class="hl opt">></span> <span class="hl num">0</span><span class="hl opt">)</span>
+ <span class="hl kwa">return</span> result<span class="hl opt">.</span><span class="hl kwd">left</span><span class="hl opt">(</span>length<span class="hl opt">);</span>
+ <span class="hl kwa">else</span>
+ <span class="hl kwa">return</span> result<span class="hl opt">;</span>
+<span class="hl opt">}</span></pre>
+
+ <p>We also know now the maximum length of the generated password, which is 24. Go back to the <tt>module.h</tt> header file and
+ modify the <tt>GeneratorImpl::maxLength()</tt> function:</p>
+
+<pre class="hl"><span class="hl kwc">virtual</span> <span class="hl kwb">int</span> <span class="hl kwd">maxLength</span><span class="hl opt">()</span> <span class="hl kwb">const</span> <span class="hl opt">{</span> <span class="hl kwa">return</span> <span class="hl num">24</span><span class="hl opt">; }</span></pre>
+
+ <p>Here is the final <tt>module.cpp</tt> file:</p>
+
+<pre class="hl"><span class="hl com">/**</span>
+<span class="hl com"> * @file src/apps/PswGen/Generator/module.cpp</span>
+<span class="hl com"> */</span>
+
+<span class="hl ppc">#include</span> <span class="hl pps">"module.h"</span><span class="hl ppc"></span>
+<span class="hl ppc">#include</span> <span class="hl pps">"version.h"</span><span class="hl ppc"></span>
+
+<span class="hl ppc">#include <Common/iLogger></span>
+<span class="hl ppc">#include <Common/iRegistry></span>
+
+<span class="hl ppc">#include <QtCore></span>
+
+<span class="hl kwd">VER_EXPORT_VERSION_INFO</span><span class="hl opt">()</span>
+<span class="hl kwd">Q_EXPORT_PLUGIN2</span><span class="hl opt">(</span>VER_MODULE_NAME_STR<span class="hl opt">,</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">::</span>Generator<span class="hl opt">::</span>Module<span class="hl opt">)</span>
+
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">;</span>
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">;</span>
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">::</span>Generator<span class="hl opt">;</span>
+
+Module<span class="hl opt">::</span><span class="hl kwd">Module</span><span class="hl opt">()</span>
+ <span class="hl opt">:</span> Plugins<span class="hl opt">::</span><span class="hl kwd">iPlugin</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">setObjectName</span><span class="hl opt">(</span><span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1.%2"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>VER_MODULE_NAME_STR<span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>__FUNCTION__<span class="hl opt">));</span>
+
+ mGenerator <span class="hl opt">=</span> <span class="hl kwa">new</span> Internal<span class="hl opt">::</span>GeneratorImpl<span class="hl opt">;</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s created"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+Module<span class="hl opt">::~</span><span class="hl kwd">Module</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwa">delete</span> mGenerator<span class="hl opt">;</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s destroyed"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+<span class="hl kwb">bool</span> Module<span class="hl opt">::</span><span class="hl kwd">init</span><span class="hl opt">(</span>QString <span class="hl kwb">const</span> <span class="hl opt">&</span> args<span class="hl opt">)</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">Q_UNUSED</span><span class="hl opt">(</span>args<span class="hl opt">);</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s initialized"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+
+ <span class="hl kwa">return true</span><span class="hl opt">;</span>
+<span class="hl opt">}</span>
+
+<span class="hl kwb">void</span> Module<span class="hl opt">::</span><span class="hl kwd">done</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s finalized"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+<span class="hl kwa">using namespace</span> eVaf<span class="hl opt">::</span>PswGen<span class="hl opt">::</span>Generator<span class="hl opt">::</span>Internal<span class="hl opt">;</span>
+
+GeneratorImpl<span class="hl opt">::</span><span class="hl kwd">GeneratorImpl</span><span class="hl opt">()</span>
+ <span class="hl opt">:</span> <span class="hl kwd">iGenerator</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">setObjectName</span><span class="hl opt">(</span><span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1.iGenerator"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>VER_MODULE_NAME_STR<span class="hl opt">));</span>
+
+ Common<span class="hl opt">::</span>iRegistry<span class="hl opt">::</span><span class="hl kwd">instance</span><span class="hl opt">()-></span><span class="hl kwd">registerInterface</span><span class="hl opt">(</span><span class="hl str">"iGenerator"</span><span class="hl opt">,</span> <span class="hl kwa">this</span><span class="hl opt">);</span>
+
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s created"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+GeneratorImpl<span class="hl opt">::~</span><span class="hl kwd">GeneratorImpl</span><span class="hl opt">()</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">EVAF_INFO</span><span class="hl opt">(</span><span class="hl str">"%s destroyed"</span><span class="hl opt">,</span> <span class="hl kwd">qPrintable</span><span class="hl opt">(</span><span class="hl kwd">objectName</span><span class="hl opt">()));</span>
+<span class="hl opt">}</span>
+
+QString GeneratorImpl<span class="hl opt">::</span><span class="hl kwd">generatePassword</span><span class="hl opt">(</span>QString <span class="hl kwb">const</span> <span class="hl opt">&</span> name<span class="hl opt">,</span> QString <span class="hl kwb">const</span> <span class="hl opt">&</span> masterPassword<span class="hl opt">,</span> <span class="hl kwb">int</span> length<span class="hl opt">,</span> uint flags<span class="hl opt">)</span> <span class="hl kwb">const</span>
+<span class="hl opt">{</span>
+ <span class="hl kwd">Q_UNUSED</span><span class="hl opt">(</span>flags<span class="hl opt">);</span>
+
+ QByteArray inputString <span class="hl opt">=</span> <span class="hl kwd">QString</span><span class="hl opt">(</span><span class="hl str">"%1%2"</span><span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>name<span class="hl opt">).</span><span class="hl kwd">arg</span><span class="hl opt">(</span>masterPassword<span class="hl opt">).</span><span class="hl kwd">toLatin1</span><span class="hl opt">();</span>
+ QCryptographicHash <span class="hl kwd">hash</span><span class="hl opt">(</span>QCryptographicHash<span class="hl opt">::</span>Md5<span class="hl opt">);</span>
+ hash<span class="hl opt">.</span><span class="hl kwd">addData</span><span class="hl opt">(</span>inputString<span class="hl opt">);</span>
+ QByteArray result <span class="hl opt">=</span> hash<span class="hl opt">.</span><span class="hl kwd">result</span><span class="hl opt">().</span><span class="hl kwd">toBase64</span><span class="hl opt">();</span>
+ <span class="hl kwa">if</span> <span class="hl opt">(</span>length <span class="hl opt">></span> <span class="hl num">0</span><span class="hl opt">)</span>
+ <span class="hl kwa">return</span> result<span class="hl opt">.</span><span class="hl kwd">left</span><span class="hl opt">(</span>length<span class="hl opt">);</span>
+ <span class="hl kwa">else</span>
+ <span class="hl kwa">return</span> result<span class="hl opt">;</span>
+<span class="hl opt">}</span></pre>
+
+ <p>Next -- <a href="pswgen05.html">05 - Building Generator Module</a>.</p>
+
+ </body>
+</html>
projects / evaf / blobdiff