author | mikaruus |
Tue, 19 Oct 2010 13:16:20 +0300 | |
changeset 9 | 8486d82aef45 |
parent 5 | 8ccc39f9d787 |
permissions | -rw-r--r-- |
0 | 1 |
/* |
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* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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#include "dpdataelement.h" // data element |
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#include "dpdatabuffer.h" // base class for rx and tx buffers |
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#include "dpdataclient.h" // data client that access buffer |
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#include "dpdef.h" // dataport definitions |
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#include "dplog.h" // dataport logging |
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5
8ccc39f9d787
New release based on our 2010wk02 release
mikaruus <mika.a.ruuskanen@nokia.com>
parents:
0
diff
changeset
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#include "OstTraceDefinitions.h" |
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#ifdef OST_TRACE_COMPILER_IN_USE |
5
8ccc39f9d787
New release based on our 2010wk02 release
mikaruus <mika.a.ruuskanen@nokia.com>
parents:
0
diff
changeset
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#include "dpdataelementTraces.h" |
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#endif |
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// EXTERNAL DATA STRUCTURES |
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// none |
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// EXTERNAL FUNCTION PROTOTYPES |
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// none |
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// CONSTANTS |
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// none |
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// MACROS |
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// none |
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// LOCAL CONSTANTS AND MACROS |
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// none |
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// MODULE DATA STRUCTURES |
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// none |
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// LOCAL FUNCTION PROTOTYPES |
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// none |
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// FORWARD DECLARATIONS |
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// none |
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// ============================= LOCAL FUNCTIONS =============================== |
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// none |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::CDpDataElement |
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// C++ default constructor can NOT contain any code, that |
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// might leave. |
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// ----------------------------------------------------------------------------- |
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// |
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CDpDataElement::CDpDataElement( |
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CDpDataBuffer& aDataBuffer, |
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TDataElementType aType ) : |
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iDB( aDataBuffer ), |
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iType( aType ), |
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iSize( 0 ), |
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iState( EDeFree ) |
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{ |
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OstTrace0( TRACE_NORMAL, CDPDATAELEMENT_CDPDATAELEMENT, "CDpDataElement::CDpDataElement" ); |
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LOGM("CDpDataElement::CDpDataElement"); |
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} |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::~CDpDataElement |
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// Destructor |
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// ----------------------------------------------------------------------------- |
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// |
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CDpDataElement::~CDpDataElement() |
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{ |
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OstTrace0( TRACE_NORMAL, DUP1_CDPDATAELEMENT_CDPDATAELEMENT, "CDpDataElement::~CDpDataElement" ); |
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LOGM("CDpDataElement::~CDpDataElement"); |
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} |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::Reserve |
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// This method reserves an data element of requested length |
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// from the buffer. aTail is not used when reserving write |
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// element, it is used only in read operations. |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CDpDataElement::Reserve( |
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const TInt aSize, |
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TPtr8& aDes, |
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TPtr8& aTail, |
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TBool aOverrideMRS ) |
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{ |
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OstTrace0( TRACE_NORMAL, CDPDATAELEMENT_RESERVE, "CDpDataElement::Reserve" ); |
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LOGM("CDpDataElement::Reserve"); |
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TInt ret( KErrNone ); |
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// Wrong size |
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if ( ( !aOverrideMRS ) && ( aSize > iDB.iMaxReservationSize || 0 >= aSize ) ) |
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{ |
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ret = KErrArgument; |
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} |
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else if ( aOverrideMRS && ( aSize > iDB.Size() || 0 >= aSize ) ) |
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{ |
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ret = KErrArgument; |
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} |
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// Already reserved |
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else if ( EDeFree != iState ) |
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{ |
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// This can happen e.g. when client makes a null read. |
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LOG(" CDpDataElement::Reserve - FAILED"); |
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OstTrace0( TRACE_NORMAL, DUP1_CDPDATAELEMENT_RESERVE, "CDpDataElement:: Reserve - FAILED" ); |
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ret = KErrGeneral; |
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} |
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else |
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{ |
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switch ( iType ) |
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{ |
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case EDeRead: |
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{ |
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ret = HandleReadTypeReserve( aSize, aDes, aTail ); |
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break; |
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} |
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case EDeWrite: |
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{ |
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ret = HandleWriteTypeReserve( aSize, aDes ); |
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break; |
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} |
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default: |
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{ |
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// This should never happen. |
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ret = KErrGeneral; |
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} |
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} |
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} |
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return ret; |
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} |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::Release |
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// This method releases the data element. When a reserved data |
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// element has been used it has to be released before it can be |
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// reserved again. If x bytes has been reserved but only y has |
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// been used, y has to be given in parameter (0 <= y <= x). |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CDpDataElement::Release( |
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const TInt aUsedLength ) |
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{ |
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OstTrace0( TRACE_NORMAL, CDPDATAELEMENT_RELEASE, "CDpDataElement::Release" ); |
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LOGM("CDpDataElement::Release"); |
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TInt ret( KErrNone ); |
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// Already reserved |
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if ( EDeReserved != iState ) |
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{ |
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LOG(" DP:DataElement::Release - FAIL, not reserved"); |
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OstTrace0( TRACE_NORMAL, DUP1_CDPDATAELEMENT_RELEASE, "CDpDataElement:: Release - FAIL, not reserved" ); |
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ret = KErrGeneral; |
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} |
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// Wrong length |
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else if ( aUsedLength > iSize || 0 > aUsedLength ) |
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{ |
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LOG(" DP:DataElement::Release - FAIL, wrong length"); |
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OstTrace0( TRACE_NORMAL, DUP2_CDPDATAELEMENT_RELEASE, "CDpDataElement:: Release - FAIL, wrong length" ); |
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ret = KErrGeneral; |
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} |
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else |
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{ |
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switch ( iType ) |
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{ |
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case CDpDataElement::EDeRead: |
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{ |
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if ( 0 != iDB.iTailWhenWrappedAround ) |
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{ |
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LOG(" DP:DataElement::Release - iTailWhenWrappedAround != 0 "); |
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OstTrace0( TRACE_NORMAL, DUP3_CDPDATAELEMENT_RELEASE, "CDpDataElement:: Release - iTailWhenWrappedAround != 0 " ); |
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TInt tailsize( iDB.iEnd - iDB.iTailWhenWrappedAround ); |
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if ( tailsize <= aUsedLength ) |
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{ |
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if ( 0 < tailsize ) |
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{ |
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TPtr8 taildesc( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf-> |
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Des()[iDB.iTailWhenWrappedAround] ), |
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tailsize, |
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tailsize ); |
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// Fill released space with FILLCHAR. |
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taildesc.Fill( KDpFillChar ); |
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} |
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//no else |
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TPtr8 tmp( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf-> |
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Des()[iDB.iTail] ), |
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( aUsedLength - tailsize ), |
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( aUsedLength - tailsize ) ); |
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// Fill released space with FILLCHAR. |
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tmp.Fill( KDpFillChar ); |
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iDB.iTailWhenWrappedAround = 0; |
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iDB.iTail += ( aUsedLength - tailsize ); |
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iDB.iEnd = iDB.iHead; |
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} |
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else |
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{ |
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// tailsize>aUsedLength |
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TPtr8 taildesc( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf-> |
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Des()[iDB.iTailWhenWrappedAround] ), |
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aUsedLength, |
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aUsedLength ); |
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// Fill released space with FILLCHAR. |
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taildesc.Fill( KDpFillChar ); |
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iDB.iTail += iDB.iTailWhenWrappedAround + aUsedLength; |
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iDB.iTailWhenWrappedAround = 0; |
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} |
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} |
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else |
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{ |
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TInt index( iDB.iTail ); |
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iDB.iTail += aUsedLength; |
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TInt freeSize( aUsedLength ); |
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TPtr8 tmp( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf-> |
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Des()[index] ), |
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freeSize, |
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freeSize ); |
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// Fill released space with FILLCHAR. |
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tmp.Fill( KDpFillChar ); |
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} |
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iState = EDeFree; |
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if ( iDB.iIsWriterWaiting && iDB.iWE.iSize <= iDB.FreeBytes() ) |
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{ |
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iDB.iIsWriterWaiting = EFalse; |
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// Signal waiting writer. |
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iDB.iWriter->ReleaseNotify(); |
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} |
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//no else |
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break; |
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} |
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case CDpDataElement::EDeWrite: |
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{ |
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iDB.iHead += aUsedLength; |
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if ( iDB.iEnd < iDB.iHead ) |
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{ |
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iDB.iEnd = iDB.iHead; |
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} |
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//no else |
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iState = EDeFree; |
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if ( iDB.iIsReaderWaiting && |
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iDB.iReader && |
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iDB.iRE.iSize <= iDB.UsedBytes() ) |
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{ |
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iDB.iIsReaderWaiting = EFalse; |
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// Signal waiting reader. |
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iDB.iReader->ReleaseNotify(); |
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} |
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//no else |
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} |
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break; |
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default: |
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{ |
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break; |
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} |
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} |
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} |
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return ret; |
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} |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::HandleReadTypeReserve |
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// This method handles reserve operation for read type element. |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CDpDataElement::HandleReadTypeReserve( |
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const TInt aSize, |
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TPtr8 &aDes, |
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TPtr8 &aTail ) |
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{ |
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OstTrace0( TRACE_NORMAL, CDPDATAELEMENT_HANDLEREADTYPERESERVE, "CDpDataElement::HandleReadTypeReserve" ); |
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LOGM("CDpDataElement::HandleReadTypeReserve"); |
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TInt ret( KErrNone ); |
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iSize = aSize; |
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// is there enough data |
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if ( aSize > iDB.UsedBytes() ) |
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{ |
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// can't have both waiting |
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if ( iDB.iIsWriterWaiting && iDB.iIsReaderWaiting) |
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{ |
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LOG(" DP:CDpDataElement::Reserve - Fail:both waiting"); |
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OstTrace0( TRACE_NORMAL, DUP1_CDPDATAELEMENT_HANDLEREADTYPERESERVE, "CDpDataElement:: - Fail: both waiting" ); |
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ret = KErrGeneral; |
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} |
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else |
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{ |
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iDB.iIsReaderWaiting = ETrue; |
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// have to wait |
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ret = KErrNotReady; |
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} |
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} |
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else |
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{ |
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iState = EDeReserved; |
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if ( ( iDB.iTail + aSize ) > iDB.iEnd ) |
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{ |
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// set des |
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TInt tailSize( iDB.iEnd-iDB.iTail ); |
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if ( tailSize > 0 ) |
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{ |
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aDes.Set( |
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reinterpret_cast<unsigned char*>( |
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&iDB.iBuf->Des()[iDB.iTail] ), |
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tailSize, |
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tailSize ); |
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} |
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//no else |
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// set tail |
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aTail.Set( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf->Des()[0] ), |
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( aSize - tailSize ), |
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( aSize - tailSize ) ); |
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iDB.iTailWhenWrappedAround = iDB.iTail; |
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iDB.iTail = 0; |
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} |
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else |
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{ |
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// in one piece, set des |
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aDes.Set( |
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reinterpret_cast<unsigned char*>( &iDB.iBuf-> |
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Des()[iDB.iTail] ), |
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iSize, |
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iSize ); |
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} |
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} |
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return ret; |
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} |
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// ----------------------------------------------------------------------------- |
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// CDpDataElement::HandleWriteTypeReserve |
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// This method handles reserve operation for write type element. |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CDpDataElement::HandleWriteTypeReserve( |
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const TInt aSize, |
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TPtr8 &aDes ) |
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{ |
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OstTrace0( TRACE_NORMAL, CDPDATAELEMENT_HANDLEWRITETYPERESERVE, "CDpDataElement::HandleWriteTypeReserve" ); |
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LOGM("CDpDataElement::HandleWriteTypeReserve"); |
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TInt ret( KErrNone ); |
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iSize = aSize; |
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||
5
8ccc39f9d787
New release based on our 2010wk02 release
mikaruus <mika.a.ruuskanen@nokia.com>
parents:
0
diff
changeset
|
380 |
if ( iDB.iHead > iDB.iTreshold || |
8ccc39f9d787
New release based on our 2010wk02 release
mikaruus <mika.a.ruuskanen@nokia.com>
parents:
0
diff
changeset
|
381 |
( iDB.iHead + aSize ) > iDB.iBuf->Length() ) |
0 | 382 |
{ |
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iDB.iHead = 0; |
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} |
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// no else |
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// There is not enough free space |
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if ( aSize > iDB.FreeBytes() ) |
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{ |
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OstTrace1( TRACE_NORMAL, DUP1_CDPDATAELEMENT_HANDLEWRITETYPERESERVE, "CDpDataElement:: aSize: %d", aSize ); |
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OstTrace1( TRACE_NORMAL, DUP2_CDPDATAELEMENT_HANDLEWRITETYPERESERVE, "CDpDataElement:: iDB.FreeBytes: %d", iDB.FreeBytes() ); |
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LOG1(" CDpDataElement::HandleWriteTypeReserve, aSize = %d", |
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aSize ); |
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LOG1(" CDpDataElement::HandleWriteTypeReserve, iDB.FreeBytes = %d", |
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iDB.FreeBytes() ); |
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// Cannot have both waiting. |
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if ( iDB.iIsReaderWaiting ) |
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{ |
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LOG(" ERROR, CDpDataElement::HandleWriteTypeReserve, Both waiting"); |
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OstTrace0( TRACE_NORMAL, DUP3_CDPDATAELEMENT_HANDLEWRITETYPERESERVE, "ERROR, CDpDataElement::HandleWriteTypeReserve, Both waiting" ); |
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ret = KErrGeneral; |
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} |
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else |
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{ |
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iDB.iIsWriterWaiting = ETrue; |
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// Have to wait. |
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ret = KErrNotReady; |
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} |
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} |
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else |
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{ |
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iState = EDeReserved; |
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// In one piece, set des |
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aDes.Set( reinterpret_cast<unsigned char*>( |
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&iDB.iBuf->Des()[iDB.iHead] ), 0, iSize ); |
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} |
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420 |
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return ret; |
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} |
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423 |
||
424 |
// ========================== OTHER EXPORTED FUNCTIONS ========================= |
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425 |
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426 |
// none |
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427 |
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428 |
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429 |
// End of File |