1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/kernelhwsrv/userlibandfileserver/fileserver/sfat/sl_cache.inl	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,115 @@
     1.4 +// Copyright (c) 1996-2009 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_cache.inl
    1.18 +// 
    1.19 +//
    1.20 +
    1.21 +/**
    1.22 + @file
    1.23 + @internalTechnology
    1.24 +*/
    1.25 +
    1.26 +//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    1.27 +//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    1.28 +//!!
    1.29 +//!! WARNING!! DO NOT edit this file !! '\sfat' component is obsolete and is not being used. '\sfat32'replaces it
    1.30 +//!!
    1.31 +//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    1.32 +//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    1.33 +
    1.34 +
    1.35 +#ifndef SL_CACHE_INL
    1.36 +#define SL_CACHE_INL
    1.37 +
    1.38 +
    1.39 +/**
    1.40 +    @param  aPos media linear position
    1.41 +    @return ETrue if the aPos belongs to this page
    1.42 +*/
    1.43 +TBool CWTCachePage::PosCached(TInt64 aPos) const
    1.44 +    {
    1.45 +    return (iValid && aPos >= iStartPos && aPos < iStartPos+PageSize());
    1.46 +    }
    1.47 +
    1.48 +
    1.49 +/**
    1.50 +    Calculate data position within cache page relatively to the page beginning.
    1.51 +    @param  aPos media linear position
    1.52 +    @return data offset from the beginning of the page
    1.53 +*/
    1.54 +TUint32 CWTCachePage::PosInCachePage(TInt64 aPos) const 
    1.55 +    { 
    1.56 +    return ((TUint32)aPos - (TUint32)iStartPos) & (PageSize()-1);
    1.57 +    }
    1.58 +
    1.59 +/**
    1.60 +    Obtain pointer to the data in the cache page by media inear position
    1.61 +    @param  aPos media linear position
    1.62 +    @return pointer to the data in page buffer
    1.63 +*/
    1.64 +TUint8* CWTCachePage::PtrInCachePage(TInt64 aPos) const 
    1.65 +    { 
    1.66 +    return (TUint8*)iData.Ptr() + PosInCachePage(aPos);
    1.67 +    }
    1.68 +
    1.69 +/**
    1.70 +    @return cache page size in bytes
    1.71 +*/
    1.72 +TUint32 CWTCachePage::PageSize() const 
    1.73 +    {
    1.74 +    return iData.Size();
    1.75 +    }  
    1.76 +
    1.77 +//---------------------------------------------------------------------------------------------------------------------------------
    1.78 +
    1.79 +
    1.80 +/**
    1.81 +    Just helper method to calculate cache page start position by given media pos.
    1.82 +    @param  aPos media linear position
    1.83 +    @return rounded-down and aligned position that is the beginning of the cache page
    1.84 +*/
    1.85 +TInt64  CMediaWTCache::CalcPageStartPos(TInt64 aPos) const 
    1.86 +    { 
    1.87 +    ASSERT(aPos >= iCacheBasePos);
    1.88 +    return (((aPos - iCacheBasePos) >> iPageSizeLog2) << iPageSizeLog2) + iCacheBasePos;
    1.89 +    }
    1.90 +
    1.91 +/**
    1.92 +    @return cache page size
    1.93 +*/
    1.94 +TUint32 CMediaWTCache::PageSize() const 
    1.95 +    {
    1.96 +    return 1<<iPageSizeLog2;
    1.97 +    }
    1.98 +
    1.99 +
   1.100 +/**
   1.101 +    Set cache base position at aBasePos
   1.102 +    @param  aBasePos  base position of the cache pages. Affects pages alignment.
   1.103 +*/
   1.104 +void CMediaWTCache::SetCacheBasePos(TInt64 aBasePos)
   1.105 +    {
   1.106 +    iCacheBasePos = aBasePos;
   1.107 +    }
   1.108 +
   1.109 +
   1.110 +
   1.111 +//---------------------------------------------------------------------------------------------------------------------------------
   1.112 +
   1.113 +
   1.114 +#endif //SL_CACHE_INL
   1.115 +
   1.116 +
   1.117 +
   1.118 +