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// Copyright (c) 1996-2009 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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// f32\sfat32\inc\sl_cache.inl
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//
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//
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/**
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@file
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@internalTechnology
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*/
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#ifndef SL_CACHE_INL
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#define SL_CACHE_INL
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/**
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@param aPos media linear position
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@return ETrue if the aPos belongs to this page
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*/
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TBool CWTCachePage::PosCached(TInt64 aPos) const
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{
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return (iValid && aPos >= iStartPos && aPos < iStartPos+PageSize());
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}
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/**
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Calculate data position within cache page relatively to the page beginning.
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@param aPos media linear position
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@return data offset from the beginning of the page
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*/
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TUint32 CWTCachePage::PosInCachePage(TInt64 aPos) const
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{
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return ((TUint32)aPos - (TUint32)iStartPos) & (PageSize()-1);
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}
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/**
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Obtain pointer to the data in the cache page by media inear position
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@param aPos media linear position
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@return pointer to the data in page buffer
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*/
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TUint8* CWTCachePage::PtrInCachePage(TInt64 aPos) const
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{
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return (TUint8*)iData.Ptr() + PosInCachePage(aPos);
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}
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/**
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@return cache page size in bytes
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*/
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TUint32 CWTCachePage::PageSize() const
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{
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return iData.Size();
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}
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//---------------------------------------------------------------------------------------------------------------------------------
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/**
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Just helper method to calculate cache page start position by given media pos.
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@param aPos media linear position
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@return rounded-down and aligned position that is the beginning of the cache page
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*/
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TInt64 CMediaWTCache::CalcPageStartPos(TInt64 aPos) const
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{
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ASSERT(aPos >= iCacheBasePos);
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return (((aPos - iCacheBasePos) >> iPageSizeLog2) << iPageSizeLog2) + iCacheBasePos;
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}
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/**
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@return cache page size
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*/
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TUint32 CMediaWTCache::PageSize() const
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{
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return 1<<iPageSizeLog2;
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}
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/**
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Set cache base position at aBasePos
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@param aBasePos base position of the cache pages. Affects pages alignment.
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*/
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void CMediaWTCache::SetCacheBasePos(TInt64 aBasePos)
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{
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iCacheBasePos = aBasePos;
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}
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//---------------------------------------------------------------------------------------------------------------------------------
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#endif //SL_CACHE_INL
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