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