1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/kernelhwsrv/userlibandfileserver/fileserver/sfat32/inc/sl_fatcache32.inl	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,122 @@
     1.4 +// Copyright (c) 1998-2009 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 the License "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 +// f32\sfat32\inc\sl_facache32.h
    1.18 +// FAT32 various cache classes definition
    1.19 +// 
    1.20 +//
    1.21 +
    1.22 +/**
    1.23 + @file
    1.24 + @internalTechnology
    1.25 +*/
    1.26 +
    1.27 +#ifndef SL_FAT_CACHE_32_INL
    1.28 +#define SL_FAT_CACHE_32_INL
    1.29 +
    1.30 +
    1.31 +//-----------------------------------------------------------------------------
    1.32 +
    1.33 +
    1.34 +void CFatBitCache::SetState(CFatBitCache::TState aState) 
    1.35 +    {
    1.36 +    iState = aState;
    1.37 +    }
    1.38 +
    1.39 +/**
    1.40 +    Converts FAT index to the corresponding bit array bit number (or FAT cache sector number).
    1.41 +    @param  aFatIndex index in the FAT 
    1.42 +    @return corresponding index in the FAT bit array
    1.43 +*/
    1.44 +TUint32 CFatBitCache::FatIndexToCacheSectorNumber(TUint32 aFatIndex) const
    1.45 +    {
    1.46 +    ASSERT(aFatIndex >= KFatFirstSearchCluster);
    1.47 +    return (aFatIndex >> iFatIdxToSecCoeff);
    1.48 +    }
    1.49 +
    1.50 +/**
    1.51 +    Converts FAT32 cache sector number to the FAT32 entry index (in the beginning of this cache sector)
    1.52 +    @param  aCacheSecNum index in the FAT bit array (or FAT cache sector number)
    1.53 +    @return corresponding index in the FAT 
    1.54 +
    1.55 +*/
    1.56 +TUint32 CFatBitCache::CacheSectorNumberToFatIndex(TUint32 aCacheSecNum) const
    1.57 +    {
    1.58 +    ASSERT(aCacheSecNum < iBitCache.Size());
    1.59 +    return (aCacheSecNum << iFatIdxToSecCoeff);
    1.60 +    }
    1.61 +
    1.62 +/** @return state of the cache*/
    1.63 +CFatBitCache::TState CFatBitCache::State() const 
    1.64 +    {
    1.65 +    return iState;
    1.66 +    }
    1.67 +
    1.68 +/** 
    1.69 +    @return ETrue if the cache can be used, i.e. is fully populated
    1.70 +*/
    1.71 +TBool CFatBitCache::UsableState() const
    1.72 +    {
    1.73 +    return State() == EPopulated;
    1.74 +    }
    1.75 +
    1.76 +
    1.77 +/**
    1.78 +    @return ETrue if the FAT cache sector number "aFatSectorNum" is marked as having at least one free FAT entry.
    1.79 +    N.B. The cache must be in consistent state, i.e. fully populated.
    1.80 +*/
    1.81 +TBool CFatBitCache::FatSectorHasFreeEntry(TUint32 aFatSectorNum) const
    1.82 +    {
    1.83 +    ASSERT(UsableState());
    1.84 +    return iBitCache[aFatSectorNum];
    1.85 +    }
    1.86 +
    1.87 +/**
    1.88 +    Mark FAT cache sector number "aFatSectorNum" is as having/not having free FAT entry.
    1.89 +    N.B. The cache must be in consistent state, i.e. fully populated.
    1.90 +
    1.91 +    @param  aFatSectorNum FAT32 cache sector number [index in a bit vector] 
    1.92 +    @param  aHasFreeEntry ETrue  if we want to mark this sector as having free FAT entries; 
    1.93 +                          EFalse if we want to mark this sector as NOT having free FAT entries; 
    1.94 +*/
    1.95 +void CFatBitCache::SetFreeEntryInFatSector(TUint32 aFatSectorNum, TBool aHasFreeEntry)
    1.96 +    {
    1.97 +    ASSERT(UsableState());
    1.98 +    iBitCache.SetBitVal(aFatSectorNum, aHasFreeEntry);
    1.99 +    }
   1.100 +
   1.101 +
   1.102 +#endif //SL_FAT_CACHE_32_INL
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