1 /*

     2 * Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 * Definition of the Swi::Sis::CData

    16 *

    17 */

    18 

    19 

    20 /**

    21  @file

    22  @internalComponent

    23 */

    24 #include "sisdata.h"

    25 #include "sisdataunit.h"

    26 

    27 namespace Swi

    28 {

    29 namespace Sis

    30 {

    31 

    32 /*static*/ CData* CData::NewLC(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

    33 	{

    34 	CData* self = new(ELeave) CData(aDataProvider);

    35 	CleanupStack::PushL(self);

    36 	self->ConstructL(aBytesRead, aTypeReadBehaviour);

    37 	return self;

    38 	}

    39 

    40 /*static*/ CData* CData::NewL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

    41 	{

    42 	CData* self = NewLC(aDataProvider, aBytesRead, aTypeReadBehaviour);

    43 	CleanupStack::Pop(self);

    44 	return self;

    45 	}

    46 

    47 CData::CData(MSisDataProvider& aDataProvider) : iDataProvider(aDataProvider)

    48 	{

    49 	}

    50 

    51 CData::~CData()

    52 	{

    53 	iDataUnits.ResetAndDestroy();	

    54 	}

    55 

    56 void CData::ConstructL(TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour)

    57 	{

    58 	TInt64 arrayBytes = 0;	

    59 	CField::ConstructL(iDataProvider, EFieldTypeData, aBytesRead, aTypeReadBehaviour);	

    60 

    61 	// Remember the offset where the data begins

    62 	User::LeaveIfError(iDataProvider.Seek(ESeekCurrent, iOffset));

    63 	ReadMemberArrayL(iDataProvider, iDataUnits, EFieldTypeDataUnit, arrayBytes, EReadType);

    64 

    65 	// Calculate CRC of header and field data by reading the entire header and field

    66 	TInt64 fieldOffset = iOffset - HeaderSize();

    67 	User::LeaveIfError(iDataProvider.Seek(ESeekStart, fieldOffset));

    68 	CField::CalculateCrcL(iDataProvider, HeaderSize() + Length() + PaddingSize(), iCrc );

    69 	aBytesRead += Length() + PaddingSize();

    70 	}

    71 

    72 void CData::ReadDataL(RFile& aFile, TInt aFileIndex, TInt aDataUnit)

    73 	{

    74 	if ((aFileIndex < 0) || ((aDataUnit < 0) || (aDataUnit >= iDataUnits.Count())))

    75 		{

    76 		User::Leave(KErrCorrupt);

    77 		}

    78 	iDataUnits[aDataUnit]->ExtractDataFileL(aFile, aFileIndex);

    79 	}

    80 

    81 void CData::ReadDataL(RFile& aFile, TInt aFileIndex, TInt aDataUnit, TInt64 aLength)

    82 	{

    83 	if ((aFileIndex < 0) || ((aDataUnit < 0) || (aDataUnit >= iDataUnits.Count())))

    84 		{

    85 		User::Leave(KErrCorrupt);

    86 		}

    87 	iDataUnits[aDataUnit]->ExtractDataFileL(aFile, aFileIndex, aLength);

    88 	}

    89 

    90 void CData::AppendStubDataFieldL(RWriteStream& aWriteStream)

    91 	{

    92 	// The data field has the following structure

    93 	

    94 	//	Object 				Object Size (bytes)	Value

    95 	//	FieldType 			4					EFieldTypeData		

    96 	//  FieldLength			4					12

    97 	//  data				12					The empty Data unit array 

    98 	

    99 	//  The empty data unit array inside the Data field has the following structure

   100 	

   101 	//	Object 				Object Size (bytes)	Value

   102 	//  FieldType			4					EFieldTypeArray

   103 	//	FieldLength			4					4

   104 	// 	ArrayType			4					EFieldTypeDataUnit

   105 	

   106 	

   107 	// append the EFieldTypeData header to the stream

   108 	TBuf8<3 * sizeof(TInt32)> header;

   109 	CField::CreateHeader(EFieldTypeData, TInt64(12), header);

   110 	aWriteStream.WriteL(header);

   111 	

   112 	// append an empty array header to the stream

   113 	CField::CreateHeader(EFieldTypeArray, TInt64(4), header);

   114 	aWriteStream.WriteL(header);

   115 	

   116 	// append the array type to the stream

   117 	TInt32 arrayType;

   118 	TPckg<TInt32> pckg(arrayType);

   119 	arrayType = static_cast<TInt32>(EFieldTypeDataUnit);

   120 	aWriteStream.WriteL(pckg);

   121 	}

   122 

   123 

   124 } //namespace Sis

   125 

   126 } //namespace Swi

   127 

   128