imgtools/imglib/filesystem/source/fat16bootsector.cpp
author timothy.murphy@nokia.com
Fri, 16 Apr 2010 11:57:28 +0100
branchfix
changeset 485 926e968477c6
parent 0 044383f39525
permissions -rw-r--r--
fix: recipestats.py produces "correct" header line, also sorts by time to show recipe using the largest time first.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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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 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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* This class represents the boot sector of a FAT16 image. 
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* This class is derived from basebootsector class which is constitutes 
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* the common boot sector fields for FAT16 and FAT32 class. 	
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* @internalComponent
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* @released
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*
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*/
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#include "fat16bootsector.h"
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/**
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Constructor of the fat16 boot sector class
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@internalComponent
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@released
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*/
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TFAT16BootSector::TFAT16BootSector()
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{
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}
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/**
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Destructor of the fat16 boot sector class
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@internalComponent
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@released
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*/
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TFAT16BootSector::~TFAT16BootSector()
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{
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}
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/**
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Set the file system type
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@internalComponent
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@released
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*/
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void TFAT16BootSector::SetFileSysType()
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{
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	strcpy(reinterpret_cast<char*>(iFileSysType),"FAT16   ");
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}	
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/**
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returns the file system type
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@return file system type 
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@internalComponent
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@released
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*/
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unsigned char* TFAT16BootSector::FileSysType()
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{
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	return iFileSysType;
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}
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/**
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Number of entries allowed in the root directory,specific to Fat12/16,
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zero for FAT32
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@internalComponent
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@released
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*/
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void TFAT16BootSector::SetRootDirEntries()
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{
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	iRootDirEntries = KDefaultRootDirEntries;;		
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}
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/**
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Sets the number of reserved sectors on the volume
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@internalComponent
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@released
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*/
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void TFAT16BootSector::SetReservedSectors()
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{
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	iReservedSectors = KDefaultFat16ReservedSectors;
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}
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/**
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Computes the sectors per cluster ratio
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To refer this mathematical computation, Please see:
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Microsoft Extensible Firmware Initiative FAT32 File 
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System Specification document
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@internalComponent
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@released
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@param aPartitionSize partition size in bytes
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*/
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void TFAT16BootSector::ComputeSectorsPerCluster(Long64 aPartitionSize)
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{
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	if(aPartitionSize > K1GB)
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	{
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		iSectorsPerCluster = K64SectorsPerCluster;
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	}
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	else if(aPartitionSize > K512MB)
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	{
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		iSectorsPerCluster = K32SectorsPerCluster;
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	}
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	else if(aPartitionSize > K256MB)
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	{
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		iSectorsPerCluster = K16SectorsPerCluster;
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	}
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	else if(aPartitionSize > K128MB)
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	{
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		iSectorsPerCluster = K8SectorsPerCluster;
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	}
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	else if(aPartitionSize > K16MB)
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	{
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		iSectorsPerCluster = K4SectorsPerCluster;
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	}
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	else 
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	{
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		iSectorsPerCluster = K2SectorsPerCluster;
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	}
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}
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/**
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Sectors used for the Fat table
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To refer this mathematical formulae, Please see:
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Microsoft Extensible Firmware Initiative FAT32 File System Specification 
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document
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@internalComponent
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@released
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@param aPartitionSize partition size
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*/
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void TFAT16BootSector::ComputeFatSectors(Long64 aPartitionSize)
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{
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	int iRootDirSectors = ((iRootDirEntries * 32) + (iBytesPerSector - 1)) / iBytesPerSector;
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	int Log2OfBytesPerSector = Log2(iBytesPerSector);
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	unsigned long TotalSectors64 = (unsigned long)(aPartitionSize >> Log2OfBytesPerSector);
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	unsigned int tmpval1 = TotalSectors64 - (iReservedSectors + iRootDirSectors);
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	unsigned int tmpval2 =(256 * iSectorsPerCluster) + iNumberOfFats;
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	unsigned int FatSectors =(tmpval1 + (tmpval2 - 1)) / tmpval2;
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	iFatSectors = (unsigned short)FatSectors;	
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	iFatSectors32 = 0;
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}