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Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_mmfdes_8cpp_source.html
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
changeset 14 578be2adaf3e
parent 6 43e37759235e
permissions -rw-r--r--
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
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<title>TB9.2 Example Applications: examples/Multimedia/MmfExSinkSource/Mmfdes.cpp Source File</title>
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<link href="tabs.css" rel="stylesheet" type="text/css"/>
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<link href="doxygen.css" rel="stylesheet" type="text/css"/>
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</head>
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<body>
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<!-- Generated by Doxygen 1.6.2 -->
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<h1>examples/Multimedia/MmfExSinkSource/Mmfdes.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// mmfdes.cpp</span>
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<a name="l00002"></a>00002 <span class="comment">//</span>
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<a name="l00003"></a>00003 <span class="comment">// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
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<a name="l00004"></a>00004 <span class="comment">// All rights reserved.</span>
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<a name="l00005"></a>00005 <span class="comment">// This component and the accompanying materials are made available</span>
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<a name="l00006"></a>00006 <span class="comment">// under the terms of &quot;Eclipse Public License v1.0&quot;</span>
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<a name="l00007"></a>00007 <span class="comment">// which accompanies this distribution, and is available</span>
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<a name="l00008"></a>00008 <span class="comment">// at the URL &quot;http://www.eclipse.org/legal/epl-v10.html&quot;.</span>
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<a name="l00009"></a>00009 <span class="comment">//</span>
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<a name="l00010"></a>00010 <span class="comment">// Initial Contributors:</span>
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<a name="l00011"></a>00011 <span class="comment">// Nokia Corporation - initial contribution.</span>
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<a name="l00012"></a>00012 <span class="comment">//</span>
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<a name="l00013"></a>00013 <span class="comment">// Contributors:</span>
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<a name="l00014"></a>00014 <span class="comment">//</span>
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<a name="l00015"></a>00015 <span class="comment">// Description:</span>
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<a name="l00016"></a>00016 <span class="comment">//</span>
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<a name="l00017"></a>00017
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<a name="l00018"></a>00018
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<a name="l00019"></a>00019
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<a name="l00020"></a>00020 <span class="preprocessor">#include &lt;f32file.h&gt;</span>
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<a name="l00021"></a>00021 <span class="preprocessor">#include &lt;e32std.h&gt;</span>
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<a name="l00022"></a>00022 <span class="preprocessor">#include &lt;mmfdatabuffer.h&gt;</span>
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<a name="l00023"></a>00023
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<a name="l00024"></a>00024 <span class="preprocessor">#include &quot;mmfexdes.h&quot;</span>
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<a name="l00025"></a>00025 <span class="preprocessor">#include &quot;MmfExSinkSourceUIDs.hrh&quot;</span>
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<a name="l00026"></a>00026
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<a name="l00027"></a>00027 <span class="comment">// Panic function</span>
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<a name="l00028"></a>00028 <span class="keywordtype">void</span> Panic(TMMFExDescriptorPanicCode aPanicCode)
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<a name="l00029"></a>00029         {
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<a name="l00030"></a>00030         <a class="code" href="secureclientandserver_8h.html#a5eadd4429627d82193b37536d4faa03a">_LIT</a>(KMMFExDescriptorPanicCategory, <span class="stringliteral">&quot;MMFExDescriptor&quot;</span>);
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<a name="l00031"></a>00031         User::Panic(KMMFExDescriptorPanicCategory, aPanicCode);
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<a name="l00032"></a>00032         }
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<a name="l00033"></a>00033
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<a name="l00034"></a>00034 <span class="comment">//</span>
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<a name="l00035"></a>00035 <span class="comment">// CMMFExDescriptor</span>
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<a name="l00036"></a>00036 <span class="comment">//</span>
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<a name="l00037"></a>00037
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<a name="l00038"></a>00038 <span class="comment">// Plugin implementation UIDs</span>
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<a name="l00039"></a>00039 <span class="keyword">const</span> TUid KDescriptorSourceUIDObject   = {KDescriptorSourceUID};
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<a name="l00040"></a>00040 <span class="keyword">const</span> TUid KDescriptorSinkUIDObject     = {KDescriptorSinkUID};
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<a name="l00041"></a>00041
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<a name="l00042"></a>00042 <span class="comment">// Constructor</span>
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<a name="l00043"></a>00043 CMMFExDescriptor::CMMFExDescriptor( ) : CMMFClip( TUid(KDescriptorSourceUIDObject), TUid(KDescriptorSinkUIDObject ))
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<a name="l00044"></a>00044         {
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<a name="l00045"></a>00045         iOffset = 0 ;
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<a name="l00046"></a>00046         }
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<a name="l00047"></a>00047
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<a name="l00048"></a>00048 <span class="comment">// Destructor</span>
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<a name="l00049"></a>00049 CMMFExDescriptor::~CMMFExDescriptor()
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<a name="l00050"></a>00050         {
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<a name="l00051"></a>00051         iDesThread.Close() ;
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<a name="l00052"></a>00052         }
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<a name="l00053"></a>00053
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<a name="l00054"></a>00054 <span class="comment">// Factory function for source plug-in</span>
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<a name="l00055"></a>00055 MDataSource* CMMFExDescriptor::NewSourceL( )
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<a name="l00056"></a>00056         {
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<a name="l00057"></a>00057         <a class="code" href="class_c_m_m_f_ex_descriptor.html">CMMFExDescriptor</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_m_m_f_ex_descriptor.html">CMMFExDescriptor</a>( ) ;
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<a name="l00058"></a>00058         <span class="keywordflow">return</span> STATIC_CAST( MDataSource*, <span class="keyword">self</span> ) ;
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<a name="l00059"></a>00059         }
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<a name="l00060"></a>00060
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<a name="l00061"></a>00061 <span class="comment">// Factory function for sink plug-in</span>
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<a name="l00062"></a>00062 MDataSink* CMMFExDescriptor::NewSinkL( )
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<a name="l00063"></a>00063         {
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<a name="l00064"></a>00064         <a class="code" href="class_c_m_m_f_ex_descriptor.html">CMMFExDescriptor</a>* <span class="keyword">self</span> = <span class="keyword">new</span> (ELeave) <a class="code" href="class_c_m_m_f_ex_descriptor.html">CMMFExDescriptor</a>( ) ;
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<a name="l00065"></a>00065         <span class="keywordflow">return</span> STATIC_CAST( MDataSink*, <span class="keyword">self</span> ) ;
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<a name="l00066"></a>00066         }
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<a name="l00067"></a>00067
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<a name="l00068"></a>00068 <span class="comment">// MDataSource factory</span>
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<a name="l00069"></a>00069 <span class="comment">// aInitData is a packaged TMMFExDescriptorParams</span>
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<a name="l00070"></a>00070 <span class="keywordtype">void</span> CMMFExDescriptor::ConstructSourceL( <span class="keyword">const</span> TDesC8&amp; aInitData )
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<a name="l00071"></a>00071         {
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<a name="l00072"></a>00072         ConstructL( aInitData ) ;
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<a name="l00073"></a>00073         }
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075 <span class="comment">// MDataSink factory</span>
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<a name="l00076"></a>00076 <span class="comment">// aInitData is a packaged TMMFExDescriptorParams</span>
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<a name="l00077"></a>00077 <span class="keywordtype">void</span> CMMFExDescriptor::ConstructSinkL( <span class="keyword">const</span> TDesC8&amp; aInitData )
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<a name="l00078"></a>00078         {
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<a name="l00079"></a>00079         ConstructL( aInitData ) ;
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<a name="l00080"></a>00080         }
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<a name="l00081"></a>00081
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<a name="l00082"></a>00082 <span class="comment">// Construction helper</span>
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<a name="l00083"></a>00083 <span class="comment">// aInitData is a packaged TMMFExDescriptorParams</span>
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<a name="l00084"></a>00084 <span class="keywordtype">void</span> CMMFExDescriptor::ConstructL( <span class="keyword">const</span> TDesC8&amp; aInitData )
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<a name="l00085"></a>00085         {
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<a name="l00086"></a>00086         <span class="comment">// get descriptor to which to read/write, and the thread </span>
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<a name="l00087"></a>00087         <span class="comment">// to which it belongs</span>
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<a name="l00088"></a>00088         <a class="code" href="class_t_m_m_f_ex_descriptor_params.html">TMMFExDescriptorParams</a> params;
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<a name="l00089"></a>00089         TPckgC&lt;TMMFExDescriptorParams&gt; config(params);
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<a name="l00090"></a>00090         config.Set(aInitData);
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<a name="l00091"></a>00091         iDes = STATIC_CAST( TDes8*, config().iDes);
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<a name="l00092"></a>00092         User::LeaveIfError( iDesThread.Open( config().iDesThreadId ) );
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<a name="l00093"></a>00093         }
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   104
 
<a name="l00094"></a>00094
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<a name="l00095"></a>00095
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   106
 
<a name="l00096"></a>00096 <span class="comment">// From MDataSource</span>
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 TFourCC CMMFExDescriptor::SourceDataTypeCode(TMediaId <span class="comment">/*aMediaId*/</span>)
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<a name="l00099"></a>00099         {
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<a name="l00100"></a>00100         <span class="keywordflow">return</span> iSourceFourCC ;
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<a name="l00101"></a>00101         }
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   112
 
<a name="l00102"></a>00102
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   113
 
<a name="l00103"></a>00103 <span class="comment">// Fills a buffer from the source descriptor</span>
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<a name="l00104"></a>00104 <span class="keywordtype">void</span> CMMFExDescriptor::FillBufferL( CMMFBuffer* aBuffer, MDataSink* aConsumer, TMediaId <span class="comment">/*aMediaId*/</span>  )
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<a name="l00105"></a>00105         {
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<a name="l00106"></a>00106         <span class="comment">// Current position in Descriptor is iOffset.</span>
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<a name="l00107"></a>00107
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<a name="l00108"></a>00108         <span class="comment">// Read from iDes in iDesThread into Des in aBuffer.</span>
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   119
 
<a name="l00109"></a>00109
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<a name="l00110"></a>00110         <span class="comment">// Assume that the amount to be read is the size of the buffer descriptor</span>
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<a name="l00111"></a>00111         <span class="comment">// Should check that there is sufficient data in the source buffer</span>
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<a name="l00112"></a>00112         <span class="comment">// If there is not enough to fill the target then copy what there is</span>
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<a name="l00113"></a>00113
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<a name="l00114"></a>00114         <span class="comment">// Use of a single iOffset will preclude use by more than one client (use ReadBufferL())</span>
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<a name="l00115"></a>00115         <span class="keywordflow">if</span> ( aBuffer-&gt;Type() == KUidMmfDataBuffer  )
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<a name="l00116"></a>00116                 {
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<a name="l00117"></a>00117                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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<a name="l00118"></a>00118                 TInt targetMaxLength = bufferDes.MaxLength();
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<a name="l00119"></a>00119                 TInt sourceLength = iDes-&gt;Length();
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<a name="l00120"></a>00120
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<a name="l00121"></a>00121                 <span class="keywordflow">if</span> ( ( sourceLength - iOffset - targetMaxLength ) &gt; 0 )
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<a name="l00122"></a>00122                         {
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<a name="l00123"></a>00123                         bufferDes = iDes-&gt;Mid(iOffset,targetMaxLength);
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<a name="l00124"></a>00124                         iOffset += targetMaxLength;
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<a name="l00125"></a>00125                         }
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<a name="l00126"></a>00126                 <span class="keywordflow">else</span>
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<a name="l00127"></a>00127                         bufferDes.SetLength(0);
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<a name="l00128"></a>00128
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<a name="l00129"></a>00129                 <span class="comment">// Check if the buffer is the last buffer and if so set the last buffer flag on the CMMFDataBuffer</span>
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<a name="l00130"></a>00130                 TInt requestSize = aBuffer-&gt;RequestSize();
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<a name="l00131"></a>00131                 <span class="keywordflow">if</span> (requestSize)
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<a name="l00132"></a>00132                         { <span class="comment">// The buffer has a request size  - so assume last buffer if length is less than the request size</span>
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<a name="l00133"></a>00133                         <span class="keywordflow">if</span> (bufferDes.Length() &lt; requestSize)
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<a name="l00134"></a>00134                                 aBuffer-&gt;SetLastBuffer(ETrue);
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<a name="l00135"></a>00135                         }
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<a name="l00136"></a>00136                 <span class="keywordflow">else</span>
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<a name="l00137"></a>00137                         { <span class="comment">// There is no request size so assume last buffer if length is less than the max length</span>
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<a name="l00138"></a>00138                         <span class="keywordflow">if</span> (bufferDes.Length() &lt; bufferDes.MaxLength())
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<a name="l00139"></a>00139                                 aBuffer-&gt;SetLastBuffer(ETrue);
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<a name="l00140"></a>00140                         }
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<a name="l00141"></a>00141
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<a name="l00142"></a>00142                 aConsumer-&gt;BufferFilledL( aBuffer ) ;
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<a name="l00143"></a>00143                 }
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<a name="l00144"></a>00144         <span class="keywordflow">else</span>
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<a name="l00145"></a>00145                 User::Leave(KErrNotSupported);
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<a name="l00146"></a>00146         }
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<a name="l00147"></a>00147
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<a name="l00148"></a>00148 <span class="comment">// called by MDataSink to pass back emptied buffer to the source</span>
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<a name="l00149"></a>00149 <span class="keywordtype">void</span> CMMFExDescriptor::BufferEmptiedL( CMMFBuffer* <span class="comment">/*aBuffer*/</span> )
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<a name="l00150"></a>00150         {
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<a name="l00151"></a>00151         <span class="comment">// not supported in this plug-in</span>
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<a name="l00152"></a>00152         __ASSERT_DEBUG(EFalse, Panic(EMMFDescriptorPanicBufferEmptiedLNotSupported));
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<a name="l00153"></a>00153         }
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<a name="l00154"></a>00154
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   165
 
<a name="l00155"></a>00155 <span class="comment">// tests if the plug-in can create a source buffer</span>
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<a name="l00156"></a>00156 TBool CMMFExDescriptor::CanCreateSourceBuffer()
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<a name="l00157"></a>00157         {
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<a name="l00158"></a>00158         <span class="comment">// this can&#39;t: it needs a descriptor from another thread</span>
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<a name="l00159"></a>00159         <span class="keywordflow">return</span> EFalse ;
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<a name="l00160"></a>00160         }
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<a name="l00161"></a>00161
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<a name="l00162"></a>00162 <span class="comment">// creates a source buffer</span>
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<a name="l00163"></a>00163 CMMFBuffer* CMMFExDescriptor::CreateSourceBufferL(  TMediaId <span class="comment">/*aMediaId*/</span>, TBool&amp; <span class="comment">/*aReference*/</span> )
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<a name="l00164"></a>00164         {
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<a name="l00165"></a>00165         <span class="comment">// is not supported in this plug-in</span>
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<a name="l00166"></a>00166         User::Leave(KErrNotSupported);
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<a name="l00167"></a>00167         <span class="keywordflow">return</span> NULL;
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<a name="l00168"></a>00168         }
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<a name="l00169"></a>00169
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<a name="l00170"></a>00170
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<a name="l00171"></a>00171 <span class="comment">// from MDataSink</span>
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<a name="l00172"></a>00172
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<a name="l00173"></a>00173 <span class="comment">// gets sink codec type</span>
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   184
 
<a name="l00174"></a>00174 TFourCC CMMFExDescriptor::SinkDataTypeCode(TMediaId <span class="comment">/*aMediaId*/</span>)
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<a name="l00175"></a>00175         {
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<a name="l00176"></a>00176         <span class="keywordflow">return</span> iSinkFourCC ;
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<a name="l00177"></a>00177         }
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<a name="l00178"></a>00178
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<a name="l00179"></a>00179 <span class="comment">// Empties supplied buffer into the sink descriptor </span>
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<a name="l00180"></a>00180 <span class="keywordtype">void</span> CMMFExDescriptor::EmptyBufferL( CMMFBuffer* aBuffer, MDataSource* aSupplier, TMediaId <span class="comment">/*aMediaId*/</span> )
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<a name="l00181"></a>00181         {
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<a name="l00182"></a>00182         <span class="comment">// Current position in Descriptor is iOffset.</span>
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<a name="l00183"></a>00183
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   194
 
<a name="l00184"></a>00184         <span class="comment">// Assume that the amount to be read is the size of the buffer descriptor</span>
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<a name="l00185"></a>00185         <span class="comment">// Should check that there is sufficient data in the source buffer</span>
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<a name="l00186"></a>00186         <span class="comment">// If there is not enough to fill the target then copy what there is</span>
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<a name="l00187"></a>00187
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<a name="l00188"></a>00188         <span class="comment">// Use of a single iOffset will preclude use by more than one client (use ReadBufferL())</span>
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<a name="l00189"></a>00189
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<a name="l00190"></a>00190         <span class="keywordflow">if</span> ( aBuffer-&gt;Type() == KUidMmfDataBuffer  )
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<a name="l00191"></a>00191                 {
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<a name="l00192"></a>00192                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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<a name="l00193"></a>00193
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<a name="l00194"></a>00194                 TInt sourceLength = bufferDes.Length() ;
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<a name="l00195"></a>00195                 TInt targetLength = iDes-&gt;MaxLength() - iOffset;
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<a name="l00196"></a>00196                 <span class="keywordflow">if</span> ( targetLength&gt;0 )
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<a name="l00197"></a>00197                         {
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<a name="l00198"></a>00198                         <span class="keywordflow">if</span> (sourceLength&gt;targetLength)
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<a name="l00199"></a>00199                                 {
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<a name="l00200"></a>00200                                 sourceLength = targetLength;
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<a name="l00201"></a>00201                                 bufferDes.SetLength(targetLength);
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<a name="l00202"></a>00202                                 }
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<a name="l00203"></a>00203
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<a name="l00204"></a>00204                         iDes-&gt;Append(bufferDes) ;
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<a name="l00205"></a>00205
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<a name="l00206"></a>00206                         iOffset += sourceLength ;
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<a name="l00207"></a>00207                         }
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<a name="l00208"></a>00208                 <span class="keywordflow">else</span>
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<a name="l00209"></a>00209                         bufferDes.SetLength(0);
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<a name="l00210"></a>00210
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<a name="l00211"></a>00211                 aSupplier-&gt;BufferEmptiedL( aBuffer ) ;
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<a name="l00212"></a>00212                 }
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<a name="l00213"></a>00213         }
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<a name="l00214"></a>00214
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<a name="l00215"></a>00215 <span class="comment">// called by MDataSource to pass back full buffer to the sink</span>
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<a name="l00216"></a>00216 <span class="keywordtype">void</span> CMMFExDescriptor::BufferFilledL( CMMFBuffer* <span class="comment">/*aBuffer*/</span> )
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<a name="l00217"></a>00217         {
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<a name="l00218"></a>00218         <span class="comment">// not supported in this plug-in</span>
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<a name="l00219"></a>00219         __ASSERT_DEBUG(EFalse, Panic(EMMFDescriptorPanicBufferFilledLNotSupported));
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<a name="l00220"></a>00220         }
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<a name="l00221"></a>00221
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<a name="l00222"></a>00222 <span class="comment">// tests if the plug-in can create a sink buffer</span>
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<a name="l00223"></a>00223 TBool CMMFExDescriptor::CanCreateSinkBuffer()
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<a name="l00224"></a>00224         {
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<a name="l00225"></a>00225         <span class="comment">// this can&#39;t: it needs a descriptor from another thread        </span>
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<a name="l00226"></a>00226         <span class="keywordflow">return</span> EFalse ;
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<a name="l00227"></a>00227         }
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<a name="l00228"></a>00228
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<a name="l00229"></a>00229 <span class="comment">// creates a sink buffer</span>
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<a name="l00230"></a>00230 CMMFBuffer* CMMFExDescriptor::CreateSinkBufferL( TMediaId <span class="comment">/*aMediaId*/</span> , TBool&amp; <span class="comment">/*aReference*/</span>)
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<a name="l00231"></a>00231         {
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<a name="l00232"></a>00232         <span class="comment">// not supported in this plug-in</span>
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<a name="l00233"></a>00233         User::Leave(KErrNotSupported);
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<a name="l00234"></a>00234         <span class="keywordflow">return</span> NULL;
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<a name="l00235"></a>00235         }
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<a name="l00236"></a>00236
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<a name="l00237"></a>00237 <span class="comment">// from CMMFClip</span>
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<a name="l00238"></a>00238
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<a name="l00239"></a>00239 <span class="comment">// Loads aBuffer with specified amount of data from a specified point in the source descriptor </span>
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<a name="l00240"></a>00240 <span class="keywordtype">void</span> CMMFExDescriptor::ReadBufferL(TInt aLength, CMMFBuffer* aBuffer, TInt aPosition, MDataSink* aConsumer)
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<a name="l00241"></a>00241         {
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<a name="l00242"></a>00242         <span class="keywordflow">if</span> (aBuffer-&gt;Type() == KUidMmfDataBuffer)
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<a name="l00243"></a>00243                 {
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<a name="l00244"></a>00244                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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<a name="l00245"></a>00245
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<a name="l00246"></a>00246                 <span class="keywordflow">if</span> (aLength&gt;bufferDes.MaxLength())
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<a name="l00247"></a>00247                         User::Leave(KErrOverflow);
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<a name="l00248"></a>00248
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<a name="l00249"></a>00249                 <span class="keywordflow">if</span> ((aLength&lt;0) || (aPosition&lt;0))
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<a name="l00250"></a>00250                         User::Leave(KErrArgument);
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<a name="l00251"></a>00251
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<a name="l00252"></a>00252                 ReadBufferL(aBuffer, aPosition, aConsumer);
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<a name="l00253"></a>00253                 }
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<a name="l00254"></a>00254         <span class="keywordflow">else</span>
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<a name="l00255"></a>00255                 User::Leave(KErrNotSupported);
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<a name="l00256"></a>00256         }
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<a name="l00257"></a>00257
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<a name="l00258"></a>00258 <span class="comment">// Loads aBuffer from a specified point in the source descriptor  </span>
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<a name="l00259"></a>00259 <span class="keywordtype">void</span> CMMFExDescriptor::ReadBufferL(CMMFBuffer* aBuffer, TInt aPosition, MDataSink* aConsumer)
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<a name="l00260"></a>00260         {
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<a name="l00261"></a>00261         <span class="keywordflow">if</span> (aBuffer-&gt;Type() == KUidMmfDataBuffer)
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<a name="l00262"></a>00262                 {
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<a name="l00263"></a>00263                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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<a name="l00264"></a>00264
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<a name="l00265"></a>00265                 TInt sourceLength = iDes-&gt;Length() ;
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<a name="l00266"></a>00266                 TInt destinationMaxLength = bufferDes.MaxLength();
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<a name="l00267"></a>00267                 TInt len = sourceLength - aPosition;
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<a name="l00268"></a>00268                 <span class="keywordflow">if</span> (len &gt; destinationMaxLength)
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<a name="l00269"></a>00269                         len = destinationMaxLength;
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<a name="l00270"></a>00270
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<a name="l00271"></a>00271                 <span class="keywordflow">if</span> (len&gt;0)
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<a name="l00272"></a>00272                         {
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<a name="l00273"></a>00273                         TPtrC8 srcPtr(iDes-&gt;Mid(aPosition,len));
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<a name="l00274"></a>00274                         bufferDes.Copy(srcPtr);
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<a name="l00275"></a>00275                         }
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<a name="l00276"></a>00276                 <span class="keywordflow">else</span>
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<a name="l00277"></a>00277                         bufferDes.SetLength(0);
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<a name="l00278"></a>00278
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<a name="l00279"></a>00279                 <span class="comment">// Check if the buffer is the last buffer and if so set the last buffer flag on the CMMFDataBuffer</span>
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<a name="l00280"></a>00280                 TInt requestSize = aBuffer-&gt;RequestSize();
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<a name="l00281"></a>00281                 <span class="keywordflow">if</span> (requestSize)
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<a name="l00282"></a>00282                         { <span class="comment">// The buffer has a request size  - so assume last buffer if length is less than the request size</span>
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<a name="l00283"></a>00283                         <span class="keywordflow">if</span> (bufferDes.Length() &lt; requestSize)
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<a name="l00284"></a>00284                                 aBuffer-&gt;SetLastBuffer(ETrue);
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<a name="l00285"></a>00285                         }
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<a name="l00286"></a>00286                 <span class="keywordflow">else</span>
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<a name="l00287"></a>00287                         { <span class="comment">// There is no request size so assume last buffer if length is less than the max length</span>
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<a name="l00288"></a>00288                         <span class="keywordflow">if</span> (bufferDes.Length() &lt; bufferDes.MaxLength())
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<a name="l00289"></a>00289                                 aBuffer-&gt;SetLastBuffer(ETrue);
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<a name="l00290"></a>00290                         }
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<a name="l00291"></a>00291
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<a name="l00292"></a>00292                 <span class="keywordflow">if</span> (aConsumer)
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<a name="l00293"></a>00293                         aConsumer-&gt;BufferFilledL(aBuffer);
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<a name="l00294"></a>00294                 }
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<a name="l00295"></a>00295         <span class="keywordflow">else</span>
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<a name="l00296"></a>00296                 User::Leave(KErrNotSupported);
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<a name="l00297"></a>00297         }
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<a name="l00298"></a>00298
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<a name="l00299"></a>00299 <span class="comment">// Loads aBuffer from a specified point in the source descriptor </span>
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<a name="l00300"></a>00300 <span class="comment">// This is intended for synchronous usage</span>
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<a name="l00301"></a>00301 <span class="keywordtype">void</span> CMMFExDescriptor::ReadBufferL(CMMFBuffer* aBuffer, TInt aPosition)
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<a name="l00302"></a>00302         {
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<a name="l00303"></a>00303         ReadBufferL(aBuffer, aPosition, NULL);
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<a name="l00304"></a>00304         }
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<a name="l00305"></a>00305
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<a name="l00306"></a>00306 <span class="comment">// Writes aBuffer at specified location into the sink descriptor</span>
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diff changeset 
   317
 
<a name="l00307"></a>00307 <span class="keywordtype">void</span> CMMFExDescriptor::WriteBufferL(CMMFBuffer* aBuffer, TInt aPosition, MDataSource* aSupplier)
43e37759235e Week 12 contribution of example code"
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diff changeset 
   318
 
<a name="l00308"></a>00308         {
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parents:
diff changeset 
   319
 
<a name="l00309"></a>00309         <span class="keywordflow">if</span> (aBuffer-&gt;Type() == KUidMmfDataBuffer)
43e37759235e Week 12 contribution of example code"
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diff changeset 
   320
 
<a name="l00310"></a>00310                 {
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parents:
diff changeset 
   321
 
<a name="l00311"></a>00311                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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diff changeset 
   322
 
<a name="l00312"></a>00312
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diff changeset 
   323
 
<a name="l00313"></a>00313                 WriteBufferL(bufferDes.Length(), aBuffer, aPosition, aSupplier);
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diff changeset 
   324
 
<a name="l00314"></a>00314                 }
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diff changeset 
   325
 
<a name="l00315"></a>00315         <span class="keywordflow">else</span>
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parents:
diff changeset 
   326
 
<a name="l00316"></a>00316                 User::Leave(KErrNotSupported);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   327
 
<a name="l00317"></a>00317         }
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parents:
diff changeset 
   328
 
<a name="l00318"></a>00318
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   329
 
<a name="l00319"></a>00319 <span class="comment">// Writes specified length of aBuffer at specified location into the sink descriptor</span>
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parents:
diff changeset 
   330
 
<a name="l00320"></a>00320 <span class="keywordtype">void</span> CMMFExDescriptor::WriteBufferL(TInt aLength, CMMFBuffer* aBuffer, TInt aPosition, MDataSource* aSupplier)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   331
 
<a name="l00321"></a>00321         {
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parents:
diff changeset 
   332
 
<a name="l00322"></a>00322         <span class="keywordflow">if</span> (aBuffer-&gt;Type() == KUidMmfDataBuffer)
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diff changeset 
   333
 
<a name="l00323"></a>00323                 {
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diff changeset 
   334
 
<a name="l00324"></a>00324                 TDes8&amp; bufferDes = STATIC_CAST(CMMFDataBuffer*, aBuffer)-&gt;Data();
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diff changeset 
   335
 
<a name="l00325"></a>00325
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diff changeset 
   336
 
<a name="l00326"></a>00326                 <span class="keywordflow">if</span> (aLength&gt;bufferDes.Length() || (aLength&lt;0) || (aPosition&lt;0))
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diff changeset 
   337
 
<a name="l00327"></a>00327                         User::Leave(KErrArgument);
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diff changeset 
   338
 
<a name="l00328"></a>00328
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diff changeset 
   339
 
<a name="l00329"></a>00329                 TInt sourceLength = aLength;
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diff changeset 
   340
 
<a name="l00330"></a>00330                 TPtr8 bufferPtr(((sourceLength) ? &amp;bufferDes[0] : NULL), sourceLength, sourceLength);
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parents:
diff changeset 
   341
 
<a name="l00331"></a>00331                 TInt targetLength = iDes-&gt;MaxLength() - aPosition;
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diff changeset 
   342
 
<a name="l00332"></a>00332                 <span class="keywordflow">if</span> (targetLength&gt;0 &amp;&amp; sourceLength &gt; 0)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   343
 
<a name="l00333"></a>00333                         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   344
 
<a name="l00334"></a>00334                         <span class="keywordflow">if</span> (sourceLength&gt;targetLength)
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parents:
diff changeset 
   345
 
<a name="l00335"></a>00335                                 User::Leave(KErrOverflow);
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diff changeset 
   346
 
<a name="l00336"></a>00336
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diff changeset 
   347
 
<a name="l00337"></a>00337                         <span class="keywordflow">if</span> ((iDes-&gt;Length() - aPosition) &gt; 0)
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parents:
diff changeset 
   348
 
<a name="l00338"></a>00338                                 {
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diff changeset 
   349
 
<a name="l00339"></a>00339                                 TInt bytesToReplace = iDes-&gt;Length() - aPosition;
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parents:
diff changeset 
   350
 
<a name="l00340"></a>00340                                 <span class="keywordflow">if</span> (sourceLength &gt; bytesToReplace)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   351
 
<a name="l00341"></a>00341                                         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   352
 
<a name="l00342"></a>00342                                         TPtrC8 replaceBuf = bufferPtr.Left(bytesToReplace);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   353
 
<a name="l00343"></a>00343                                         TPtrC8 appendBuf = bufferPtr.Right(sourceLength-bytesToReplace);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   354
 
<a name="l00344"></a>00344                                         iDes-&gt;Replace(aPosition, bytesToReplace, replaceBuf);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   355
 
<a name="l00345"></a>00345                                         iDes-&gt;Append(appendBuf);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   356
 
<a name="l00346"></a>00346                                         }
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parents:
diff changeset 
   357
 
<a name="l00347"></a>00347                                 <span class="keywordflow">else</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   358
 
<a name="l00348"></a>00348                                         iDes-&gt;Replace(aPosition, sourceLength, bufferPtr);
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diff changeset 
   359
 
<a name="l00349"></a>00349
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diff changeset 
   360
 
<a name="l00350"></a>00350                                 }
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   361
 
<a name="l00351"></a>00351                         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aPosition == iDes-&gt;Length())
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   362
 
<a name="l00352"></a>00352                                 iDes-&gt;Append(bufferPtr.Ptr(),sourceLength);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   363
 
<a name="l00353"></a>00353                         <span class="keywordflow">else</span>
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parents:
diff changeset 
   364
 
<a name="l00354"></a>00354                                 {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   365
 
<a name="l00355"></a>00355                                 iDes-&gt;AppendFill(0,aPosition - iDes-&gt;Length());
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   366
 
<a name="l00356"></a>00356                                 iDes-&gt;Append(bufferPtr.Ptr(),sourceLength);
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parents:
diff changeset 
   367
 
<a name="l00357"></a>00357                                 }
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parents:
diff changeset 
   368
 
<a name="l00358"></a>00358                         }
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parents:
diff changeset 
   369
 
<a name="l00359"></a>00359                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (targetLength&lt;0)
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diff changeset 
   370
 
<a name="l00360"></a>00360                         User::Leave(KErrArgument);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   371
 
<a name="l00361"></a>00361                 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (aLength != 0)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   372
 
<a name="l00362"></a>00362                         User::Leave(KErrOverflow);
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diff changeset 
   373
 
<a name="l00363"></a>00363
43e37759235e Week 12 contribution of example code"
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diff changeset 
   374
 
<a name="l00364"></a>00364                 <span class="keywordflow">if</span> (aSupplier)
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   375
 
<a name="l00365"></a>00365                         aSupplier-&gt;BufferEmptiedL(aBuffer);
43e37759235e Week 12 contribution of example code"
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diff changeset 
   376
 
<a name="l00366"></a>00366                 }
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diff changeset 
   377
 
<a name="l00367"></a>00367         <span class="keywordflow">else</span>
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parents:
diff changeset 
   378
 
<a name="l00368"></a>00368                 User::Leave(KErrNotSupported);
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   379
 
<a name="l00369"></a>00369         }
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parents:
diff changeset 
   380
 
<a name="l00370"></a>00370
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   381
 
<a name="l00371"></a>00371 <span class="comment">// Writes aBuffer at specified location into the sink descriptor</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   382
 
<a name="l00372"></a>00372 <span class="keywordtype">void</span> CMMFExDescriptor::WriteBufferL( CMMFBuffer* aBuffer, TInt aPosition)
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   383
 
<a name="l00373"></a>00373         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   384
 
<a name="l00374"></a>00374         WriteBufferL( aBuffer, aPosition, NULL );
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   385
 
<a name="l00375"></a>00375         }
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parents:
diff changeset 
   386
 
<a name="l00376"></a>00376
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   387
 
<a name="l00377"></a>00377 <span class="comment">// Gets the space available in the clip</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   388
 
<a name="l00378"></a>00378 TInt64 CMMFExDescriptor::BytesFree()
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   389
 
<a name="l00379"></a>00379         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   390
 
<a name="l00380"></a>00380         <span class="comment">// get difference between length and maxlength</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   391
 
<a name="l00381"></a>00381         TInt64 length = iDes-&gt;Length() ;
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   392
 
<a name="l00382"></a>00382         TInt64 maxLength =  iDes-&gt;MaxLength() ;
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   393
 
<a name="l00383"></a>00383         <span class="keywordflow">return</span>( maxLength - length ) ;
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   394
 
<a name="l00384"></a>00384         }
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parents:
diff changeset 
   395
 
<a name="l00385"></a>00385
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   396
 
<a name="l00386"></a>00386 <span class="comment">// Gets the size of the clip</span>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   397
 
<a name="l00387"></a>00387 TInt CMMFExDescriptor::Size()
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   398
 
<a name="l00388"></a>00388         {
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   399
 
<a name="l00389"></a>00389         <span class="comment">// Length (not max length) of descriptor</span>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   400
 
<a name="l00390"></a>00390         TInt length = iDes-&gt;Length();
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   401
 
<a name="l00391"></a>00391         <span class="keywordflow">return</span>(length);
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   402
 
<a name="l00392"></a>00392         }
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   403
 
</pre></div></div>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   404
 
<hr size="1"/><address style="text-align: right;"><small>Generated by&nbsp;
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   405
 
<a href="http://www.doxygen.org/index.html">
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   406
 
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address>
43e37759235e Week 12 contribution of example code"
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parents:
diff changeset 
   407
 
</body>
43e37759235e Week 12 contribution of example code"
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff changeset 
   408
 
</html>
MCL/sftools/depl/docscontent