1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/persistentdata/persistentstorage/store/pcstore/src/desheader.cpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,164 @@
1.4 +// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
1.5 +// All rights reserved.
1.6 +// This component and the accompanying materials are made available
1.7 +// under the terms of "Eclipse Public License v1.0"
1.8 +// which accompanies this distribution, and is available
1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
1.10 +//
1.11 +// Initial Contributors:
1.12 +// Nokia Corporation - initial contribution.
1.13 +//
1.14 +// Contributors:
1.15 +//
1.16 +// Description:
1.17 +//
1.18 +
1.19 +#include <assert.h>
1.20 +#include <pcstore/storewritestream.h>
1.21 +#include <pcstore/storereadstream.h>
1.22 +#include <pcstore/descriptors.h>
1.23 +#include <pcstore/storeexception.h>
1.24 +#include "pcstoreconst.h"
1.25 +#include "desheader.h"
1.26 +
1.27 +namespace PCStore
1.28 +{
1.29 +/**
1.30 +Constructs the object with the specified value.
1.31 +
1.32 +@param aCount The value for this object.
1.33 +*/
1.34 +TCardinality::TCardinality(TInt aCount)
1.35 + :iCount(aCount)
1.36 + {}
1.37 +
1.38 +/**
1.39 +Externalizes this object to a write stream.
1.40 +
1.41 +@param aStream The write stream to which the object should be externalized.
1.42 +@exception TStoreException::EFileWriteError Error occurs when writing to the file.
1.43 +*/
1.44 +void TCardinality::Externalize(CStoreWriteStream& aStream) const
1.45 + {
1.46 +
1.47 + TUint n=iCount;
1.48 + if (n<=(KMaxTUint8>>KShiftCardinality8))
1.49 + {
1.50 + aStream.WriteUint8((n<<KShiftCardinality8));
1.51 + }
1.52 + else
1.53 + {
1.54 + if (n<=(KMaxTUint16>>KShiftCardinality16))
1.55 + {
1.56 + aStream.WriteUint16((n<<KShiftCardinality16)+0x1);
1.57 + }
1.58 + else
1.59 + {
1.60 + assert(n <= (TUint)KMaxCardinality);
1.61 + aStream.WriteUint32((n<<KShiftCardinality32)+0x3);
1.62 + }
1.63 + }
1.64 + }
1.65 +
1.66 +/**
1.67 +Internalizes this object from a read stream.
1.68 +
1.69 +@param aStream The read stream from which the object is to be internalized.
1.70 +@exception TStoreException::EFileReadError Error occurs when reading from the file.
1.71 +@exception TStoreException::EStoreCorrupt Store file is corrupted so that an invalid cardinal
1.72 +number is read.
1.73 +*/
1.74 +void TCardinality::Internalize(CStoreReadStream& aStream)
1.75 + {
1.76 + TUint n=aStream.ReadUint8();
1.77 + if ((n&0x1)==0)
1.78 + {
1.79 + n>>=KShiftCardinality8;
1.80 + }
1.81 + else
1.82 + {
1.83 + if ((n&0x2)==0)
1.84 + {
1.85 + n+=aStream.ReadUint8()<<8;
1.86 + n>>=KShiftCardinality16;
1.87 + }
1.88 + else
1.89 + {
1.90 + if ((n&0x4)==0)
1.91 + {
1.92 + aStream.Read(reinterpret_cast<TUint8*>(&iCount),sizeof(TUint32)-sizeof(TUint8));
1.93 + n+=TUint(iCount)<<8;
1.94 + n>>=KShiftCardinality32;
1.95 + }
1.96 + else
1.97 + {
1.98 + throw TStoreException(TStoreException::EStoreCorrupt);
1.99 + }
1.100 + }
1.101 + }
1.102 + assert(n <= static_cast<TUint>(KMaxCardinality));
1.103 + iCount=n;
1.104 + }
1.105 +
1.106 +/**
1.107 +Converts this object to TInt,
1.108 +
1.109 +@return The value for this object
1.110 +*/
1.111 +TCardinality::operator TInt() const
1.112 + {
1.113 + return iCount;
1.114 + }
1.115 +
1.116 +/**
1.117 +Constructs the header for the specified 8-bit descriptor.
1.118 +
1.119 +@param aDes8 The reference to the 8-bit descriptor for which to form the header.
1.120 +*/
1.121 +CDesHeader::CDesHeader(const CDes8& aDes8)
1.122 + :iVal((aDes8.Length()<<1)+1)
1.123 + {}
1.124 +
1.125 +/**
1.126 +Constructs the header for the specified 16-bit descriptor.
1.127 +
1.128 +@param aDes16 The reference to the 16-bit descriptor for which to form the header.
1.129 +*/
1.130 +CDesHeader::CDesHeader(const CDes16& aDes16)
1.131 + :iVal((aDes16.Length()<<1))
1.132 + {}
1.133 +
1.134 +/**
1.135 +Externalize the object to the specified write stream.
1.136 +
1.137 +@param aStream The write stream to which the object should be externalized.
1.138 +@exception TStoreException::EFileWriteError Error occurs when writing to the file.
1.139 +*/
1.140 +void CDesHeader::Externalize(CStoreWriteStream& aStream) const
1.141 + {
1.142 + iVal.Externalize(aStream);
1.143 + }
1.144 +
1.145 +/**
1.146 +Internalizes the object from a read stream.
1.147 +
1.148 +@param aStream The read stream from which the object is to be internalized.
1.149 +@exception TStoreException::EStoreCorrupt Store file is corrupted so that an invalid cardinal
1.150 +number is read.
1.151 +@exception TStoreException::EFileReadError Error occurs when reading from the file.
1.152 +*/
1.153 +void CDesHeader::Internalize(CStoreReadStream& aStream)
1.154 + {
1.155 + iVal.Internalize(aStream);
1.156 + }
1.157 +
1.158 +/**
1.159 +Gets the length of the descriptor which this header represents.
1.160 +
1.161 +@return The length of the descriptor which this header represents.
1.162 +*/
1.163 +TInt CDesHeader::Length() const
1.164 + {
1.165 + return TInt(iVal)>>1;
1.166 + }
1.167 +}