fbs/fontandbitmapserver/sfbs/FbsRalc.cpp
author MattD <mattd@symbian.org>
Mon, 08 Feb 2010 18:18:38 +0000
branchNewGraphicsArchitecture
changeset 2 31d73acc5459
parent 0 5d03bc08d59c
permissions -rw-r--r--
Improved debugging for Bug 1530 - Panic during startup: ALF EGL 1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
0
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// Copyright (c) 2006-2009 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 "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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// This file holds the class methods for the Rom Address Lookup Cache feature
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// of FBServ: CFbsRalCacheEl, CFbsRalCache.
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// 
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//
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#include "FbsRalc.h"
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#include <e32svr.h>
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// ============================================================================
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/**
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Destructor of CFbsRalCacheEl objects releasing memory used by attributes.
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@internalComponent 
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@post		Object state undefined.
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*/
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CFbsRalCacheEl::~CFbsRalCacheEl()
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	{
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	User::Free(iFilename);
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	iFilename = 0;
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	}
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/**
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Default constructor for CFbsRalCacheEl objects.
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@internalComponent 
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@post		CFbsRalCacheEl initialised with a null mapping information.
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*/
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CFbsRalCacheEl::CFbsRalCacheEl() 
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: CBase(), iFilename(0), iAddress(0)
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	{
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	}
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/**
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Constructor for constructing TFbsRalCacheEl objects with valid 
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mapping information.
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@internalComponent 
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@param		aFilename full name of the file to store
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@param		aMemAddr ROM memory address file starts at
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@post		TFbsRalCacheEl initialised with the filename and memory address 
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supplied.
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@panic		EEmptyFilename panic generated when no chars in name
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@panic		EInvalidRomAddress panic generated when address out of range
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*/
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CFbsRalCacheEl* 
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CFbsRalCacheEl::New(
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	const TDesC& aFilename,
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	TAny* aMemAddr
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)
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	{
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	// Allocate memory for new cache element object and construct.
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	CFbsRalCacheEl* ptr = new CFbsRalCacheEl;
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	if (!ptr)
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		return 0;
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	// Initialise attributes of cache element.
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	ptr->iFilename = HBufC::New(aFilename.Length());
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	if (!ptr->iFilename)
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		{
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		User::Free(ptr);
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		return 0;
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		}
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	*(ptr->iFilename) = aFilename;
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	ptr->iAddress = aMemAddr;
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#ifdef _RALC_DEBUG
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	ptr->iHitCount = 1;
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#endif //_RALC_DEBUG
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	// Done, return address to caller.
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	return ptr;
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	}
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/**
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This routine is used by callers to release the memory directly used for the 
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CFbsRalCacheEl object specified WITHOUT destroying the object first. Users
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wishing to destroy the object can do so by calling the destructory directly. 
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This is necessary since new/delete are not used for objects of this class as
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out of memory panics must be avoided.
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Therefore this routine must be used with caution to avoid memory leaks! 
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@internalComponent 
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@param		aThisRef Ptr to object to free. Ptr set to 0 on exit
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*/
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void
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CFbsRalCacheEl::FreeOnly(
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	CFbsRalCacheEl*& aThisRef
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)
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	{
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	User::Free (aThisRef);
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	aThisRef = 0;
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	}
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/**
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An optimised routine for checking the filename in the entry matches that
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supplied to the routine. It compares filenames in a right to left fashion
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since most differences in filenames are in the last 16 characters or so.
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ASCII characters are compared in a case insensitive fashion.
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@internalComponent 
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@param		aSearchKey filename to compare entry with
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@return		ETrue if entry matches search key, EFalse otherwise.
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*/
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TBool
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CFbsRalCacheEl::MatchKey(
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	const TDesC& aSearchKey
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)
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	{
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	if (!iFilename)
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		return EFalse;
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	// Check both filename descriptors are the same length
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	TInt charIndex = iFilename->Length();	
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	if (charIndex != aSearchKey.Length())
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		return EFalse;
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	// Then check every character is the same by comparing right to left.
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	while (charIndex)
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		{
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		charIndex--;
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		if (ToLower((*iFilename)[charIndex]) != ToLower(aSearchKey[charIndex]))
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			return EFalse;
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		}
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	// If we reach here we know the entry matches what we are looking for.
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	return ETrue;
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	}
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TInt CFbsRalCacheEl::ToLower(TInt aInt)
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	{
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	return (0x40 < aInt && 0x5B > aInt) ? (aInt + 0x20) : aInt;
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	}
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// ============================================================================
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/**
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Destructor of CFbsRalCache objects by resetting the circular buffer.
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@internalComponent 
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@post		Object state undefined.
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*/
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CFbsRalCache::~CFbsRalCache()
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	{
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#ifdef _RALC_DEBUG
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	RDebug::Print(_L("FBS RALCache destructed for process:%x\n"),(TUint)iProcId);
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	PrintCache();
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#endif //_RALC_DEBUG
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	while (Count())
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		DropItem();
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	Reset();
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	}
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/**
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CFbsRalCache private constructor.
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@internalComponent 
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@param		aFs valid file serve session handle used in lookups.
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@post		TFbsRalCache initialised with empty cache buffer.
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@see		Public construction achieved using static New() class method.
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*/
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CFbsRalCache::CFbsRalCache(
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	RFs& aFs
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) 
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: CCirBuf<CFbsRalCacheEl>(), iFs(aFs)
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	{
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#ifdef _RALC_DEBUG
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	RProcess current;
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	iProcId = current.Id();
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	RDebug::Print(_L("FBS RALCache constructed for process:%x\n"), 
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		(TUint)iProcId);
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#endif
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	}
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/**
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CFbsRalCache public constructor. This method allocates memory for a new
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object on the default heap and initialises it with the supplied data.
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@internalComponent 
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@param		aCacheSize number (fixed) of entries in the cache. 
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@param		aFs valid file serve session handle used in lookups.
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@return		Pointer to new object, otherwise 0 when error detected.
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@post		TFbsRalCache initialised with empty cache buffer.
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*/
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CFbsRalCache* 
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CFbsRalCache::New(
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	TInt aCacheSize,
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	RFs& aFs
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)
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	{
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	if (aCacheSize == 0)
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		return 0;
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	// Allocate memory for new cache object
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	// and call its constructor to initialise it.
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	CFbsRalCache* ptr = new CFbsRalCache(aFs);
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	if (!ptr) 
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		return 0;
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	// Reserve capacity in circular buffer for cache entries.
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	TRAPD(lc, ptr->SetLengthL(aCacheSize));
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	if (lc != KErrNone)
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		{
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		User::Free(ptr);
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		return 0;
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		}
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	// Successful, new cache created.
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	return ptr;
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	}
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/**
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This is the main cache lookup method for getting a file's start address
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should it be found in ROM. It first scans the cache for a match and on a hit
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it returns the stored address. On a miss it uses the file server to get
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the file's ROM address. This result if +ve is stored and the Most-recently-used
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cache, otherwise 0 is returned.
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@internalComponent 
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@param		aFileKey Full file name of file to get address for.
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@return		Start address in ROM for the file, 0 if not in ROM.
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@post		Cache updated with new entry if ROM file and not in cache.
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*/
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TAny*
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CFbsRalCache::Lookup(
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	const TDesC& aFileKey
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)
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	{
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	// Search the cache from the head to the tail should it have any entries
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	// based on a MRU policy.
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	if (Count())
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		{
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		TUint8* ptr = iHead;
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		for (TInt num = Count(); num; num--)
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			{
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			// Calculate the address of the entry.
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			if (ptr <= iPtr)
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				ptr = iPtrE;
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			ptr-=iSize;
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			CFbsRalCacheEl* entry = (CFbsRalCacheEl*)ptr;
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			// Compare the entry key with that suppled for a match and return.
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			if (entry->MatchKey(aFileKey))
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				{
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#ifdef _RALC_DEBUG
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				RDebug::Print(_L("FBS RALCache lookup HIT: %S\n"), &aFileKey);
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				entry->iHitCount++;
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#endif //_RALC_DEBUG
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				return entry->iAddress;
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				}
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			}
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		}
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#ifdef _RALC_DEBUG
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	RDebug::Print(_L("FBS RALCache lookup MISS: %S\n"), &aFileKey);
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#endif //_RALC_DEBUG
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	// Filename not in cache, ask file server for it's ROM address.
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	TAny *romAddr = iFs.IsFileInRom (aFileKey);
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	if (romAddr)
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		{
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		// Store new filename/address mapping in cache and return.
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		(void)AddItem (aFileKey, romAddr);
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		return romAddr;
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		}
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	// It's not a file in ROM
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	return 0;
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	}
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/**
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This method will create a cache entry from the supplied data and add it to the
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head of the circular cache buffer. If the cache is full this will result in the
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entry at the tail being overwritten with the new entry inserted at the head.
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@internalComponent 
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@param		aFilename full name of the file to store
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@param		aMemAddr ROM memory address file starts at
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@return		ETrue when successfully added, EFalse otherwise.
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@post		Cache updated as described above.
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*/
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TBool 
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CFbsRalCache::AddItem(
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	const TDesC& aFilename, 
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	TAny* aMemAddr
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   292
)
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   293
	{
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	// Construct the new cache entry from the supplied data.
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   295
	CFbsRalCacheEl* entry = CFbsRalCacheEl::New(aFilename, aMemAddr);
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   296
	if (!entry)
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   297
		return EFalse;
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   298
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   299
	// Make room in the cache if we need to based on MRU policy.
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   300
	if (Count() == Length()) // Is it full?
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		DropItem();
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   302
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   303
	// Add a copy of the cache entry to the circular buffer.
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   304
	if (Add(entry) == 0)
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   305
		{
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   306
		// Failed, can't cache it!
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   307
		entry->~CFbsRalCacheEl();
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   308
		CFbsRalCacheEl::FreeOnly(entry);
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		return EFalse;
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   310
		}
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   311
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	// Item now cached so clean up local entry memory only
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   313
	CFbsRalCacheEl::FreeOnly(entry);
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   314
	return ETrue;
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   315
	}
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   316
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   317
/**
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   318
This method will create a cache entry from the supplied data and add it to the
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   319
head of the circular cache buffer. If tha cache is full this will result in the
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   320
entry at the tail being overwritten with the new entry inserted at the head.
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   321
@internalComponent 
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   322
@post		Cache updated as described above.
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   323
*/
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void
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CFbsRalCache::DropItem()
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   326
	{
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   327
	// No items to drop from cache!?
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   328
	if (Count() == 0)
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		return;
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   330
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   331
	// Remove cache entry at tail copying into temporary variable.
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   332
	CFbsRalCacheEl entry;
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   333
	Remove(&entry);
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diff changeset
   334
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   335
#ifdef _RALC_DEBUG
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   336
	RDebug::Print(_L("FBS RALCache droped element: %S, %x, %d\n"),
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   337
				entry.iFilename, entry.iAddress, entry.iHitCount); 
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   338
#endif //_RALC_DEBUG
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   339
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   340
	// 'entry' destroyed on exit and cleaned up.
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	}
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#ifdef _RALC_DEBUG
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void 
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CFbsRalCache::PrintCache()
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	{
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	if (Count())
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        {
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        TUint8* ptr = iHead;
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		TInt num = Count();
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		RDebug::Print(_L("FBS RALCache contents (%d):\n"), num);
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        for (; num; num--)
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            {
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            if (ptr <= iPtr)
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                ptr = iPtrE;
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            ptr-=iSize;
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            CFbsRalCacheEl* entry = (CFbsRalCacheEl*)ptr;
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			RDebug::Print(_L("FBS RALCache El %d: %S, %x, %d\n"), num, 
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				entry->iFilename, entry->iAddress, entry->iHitCount); 
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            }
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        }
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	else
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		{
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		RDebug::Print(_L("FBS RALCache emtpy.\n"));
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		}
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	}
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#endif
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// ==========================================================================