imgtools/imglib/filesystem/source/fat16filesystem.cpp
author jjkang
Fri, 25 Jun 2010 18:11:34 +0800
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child 590 360bd6b35136
permissions -rw-r--r--
add deprecated files
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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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* CFat16FileSystem is the concrete class which is responsible for 
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* creating a FAT16 image. This class constitutes the method to 
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* create boot sector, FAT Table and data region of a FAT16 Image
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* @internalComponent
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* @released
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*
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*/
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#include"fat16filesystem.h"
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/**
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Initializes the boot sector of a FAT 16 volume
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@internalComponent
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@released
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@param aPartitionSize partition size in bytes
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@param aConfigurableFatAttributes ConfigurableFatAttributes
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*/
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void CFat16FileSystem::CreateBootSector(Long64 aPartitionSize,ConfigurableFatAttributes* aConfigurableFatAttributes)
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{
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 	iFAT16BootSector.SetOEMName();
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	unsigned char* OEMName = iFAT16BootSector.OEMName();
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	iFAT16BootSector.SetJumpInstruction();
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	unsigned char* JmpBoot = iFAT16BootSector.JumpInstruction();
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	iFAT16BootSector.SetBytesPerSector(aConfigurableFatAttributes->iDriveSectorSize);
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	unsigned short BytesPerSector = (unsigned short)iFAT16BootSector.BytesPerSector();
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	iFAT16BootSector.ComputeSectorsPerCluster(aPartitionSize);
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	unsigned char SectorsPerCluster = iFAT16BootSector.SectorsPerCluster();
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	iFAT16BootSector.SetReservedSectors();
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	unsigned short ReservedSectors = iFAT16BootSector.ReservedSectors();
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	iFAT16BootSector.SetNumberOfFats(aConfigurableFatAttributes->iDriveNoOfFATs);
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	unsigned char NumFats = iFAT16BootSector.NumberOfFats();
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	iFAT16BootSector.SetRootDirEntries();
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	unsigned short RootDirEntries = iFAT16BootSector.RootDirEntries();
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	iFAT16BootSector.ComputeTotalSectors(aPartitionSize);
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	unsigned short LowSectors = iFAT16BootSector.LowSectorsCount();
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	iFAT16BootSector.SetMedia();
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	unsigned char Media = iFAT16BootSector.Media();
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	iFAT16BootSector.ComputeFatSectors(aPartitionSize);
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	unsigned short FatSectors = iFAT16BootSector.FatSectors();
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	iFAT16BootSector.SetSectorsPerTrack();
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	unsigned short SectorPerTrack = iFAT16BootSector.SectorsPerTrack();
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	iFAT16BootSector.SetNumberOfHeads();
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	unsigned short NumberOfHeads = iFAT16BootSector.NumberOfHeads();
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	iFAT16BootSector.SetHiddenSectors();
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	unsigned int HiddenSectors = iFAT16BootSector.HiddenSectors();
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	unsigned int HighSectorsCount = iFAT16BootSector.HighSectorsCount();
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	iFAT16BootSector.SetBootSectorDriveNumber();
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	unsigned char BootSectorDriveNumber = iFAT16BootSector.BootSectorDriveNumber();
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	iFAT16BootSector.SetReservedByte();
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	unsigned char ReservedByte = iFAT16BootSector.ReservedByte();
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	iFAT16BootSector.SetBootSignature();
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	unsigned char BootSignature = iFAT16BootSector.BootSignature();
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	iFAT16BootSector.SetVolumeId();
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	unsigned int VolumeId = iFAT16BootSector.VolumeId();
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	iFAT16BootSector.SetVolumeLab(aConfigurableFatAttributes->iDriveVolumeLabel);
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	unsigned char* VolumeLab = iFAT16BootSector.VolumeLab();
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	iFAT16BootSector.SetFileSysType();
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	unsigned char* FileSysType = iFAT16BootSector.FileSysType();
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	//copying of boot sector values in to the array
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	iData = new unsigned char[BytesPerSector];
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	unsigned int pos = 0;
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	memcpy(&iData[pos],JmpBoot,3);
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	pos += 3;
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	memcpy(&iData[pos],OEMName,8);
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	pos += 8;
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	memcpy(&iData[pos],&BytesPerSector,2);
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	pos += 2;
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	memcpy(&iData[pos],&SectorsPerCluster,1);
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	pos += 1;
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	memcpy(&iData[pos],&ReservedSectors,2);
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	pos += 2;
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	memcpy(&iData[pos],&NumFats,1);
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	pos += 1;
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	memcpy(&iData[pos],&RootDirEntries,2);
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	pos += 2;
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	memcpy(&iData[pos],&LowSectors,2);
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	pos += 2;
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	memcpy(&iData[pos],&Media,1);
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	pos += 1;
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	memcpy(&iData[pos],&FatSectors,2);
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	pos += 2;
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	memcpy(&iData[pos],&SectorPerTrack,2);
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	pos += 2;
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	memcpy(&iData[pos],&NumberOfHeads,2);
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	pos += 2;
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	memcpy(&iData[pos],&HiddenSectors,4);
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	pos += 4;
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	memcpy(&iData[pos],&HighSectorsCount,4);
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	pos += 4;
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	memcpy(&iData[pos],&BootSectorDriveNumber,1);		
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	pos += 1;
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	memcpy(&iData[pos],&ReservedByte,1);
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	pos += 1;
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	memcpy(&iData[pos],&BootSignature,1);
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	pos += 1;
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	memcpy(&iData[pos],&VolumeId,4);
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	pos += 4;
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	memcpy(&iData[pos],VolumeLab,11);
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	pos += 11;
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	memcpy(&iData[pos],FileSysType,8);
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	pos += 8;
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	while(pos < BytesPerSector)
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	{
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		iData[pos] = 0;
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		pos++;
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	}
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	// Set sector [510] as 0xAA and [511] as 0x55 to mark the end of boot sector
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	iData[KSizeOfFatBootSector-2] = 0x55;
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	iData[KSizeOfFatBootSector-1] = 0xAA;
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	// It is perfectly ok for the last two bytes of the boot sector to also 
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	// have the signature 0xAA55.
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	iData[BytesPerSector-2] = 0x55;
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	iData[BytesPerSector-1] = 0xAA;
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	ComputeClusterSizeInBytes();
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	ComputeRootDirSectors();
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	ComputeBytesPerSector();
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	MessageHandler::ReportMessage (INFORMATION,BOOTSECTORCREATEMSG, "FAT16");
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}
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/**
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Writes the boot sector of a FAT 16 volume
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@param aOutPutStream handle to file stream	
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@internalComponent
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@released
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*/
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void CFat16FileSystem::WriteBootSector(ofstream& aOutPutStream)
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{
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	MessageHandler::ReportMessage (INFORMATION,BOOTSECTORWRITEMSG,"FAT16");
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	aOutPutStream.write(reinterpret_cast<char*>(&iData[0]),iFAT16BootSector.BytesPerSector());
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	aOutPutStream.flush();
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}
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/**
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Creates the FAT Table
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@internalComponent
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@released
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@param ofstream
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*/
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void CFat16FileSystem::CreateFatTable(ofstream& aOutPutStream)
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{
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	int FATSizeInBytes = (iFAT16BootSector.FatSectors()) * (iFAT16BootSector.BytesPerSector());
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	// Each FAT16 entries occupies 2 bytes, hence divided by 2
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	unsigned int totalFatEntries = FATSizeInBytes / 2;
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	unsigned short *FatTable = new unsigned short[totalFatEntries];
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	unsigned short int clusterCounter = 1;
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	int previousCluster;
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	FatTable[0] = KFat16FirstEntry;
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	/**Say cluster 5 starts at 5 and occupies clusters 7 and 9. The FAT table should have the 
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	value 7 at	cluster location 5, the value 9 at cluster 7 and 'eof' value at cluster 9.
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	Below algorithm serves this algorithm
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	*/
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	Iterator itr = iClustersPerEntry->begin();
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	while(itr != iClustersPerEntry->end())
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	{
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		previousCluster = itr->second;
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		if(iClustersPerEntry->count(itr->first) > 1)
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		{
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			for(unsigned int i = 1; i < iClustersPerEntry->count(itr->first); i++)
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			{
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				FatTable[previousCluster] = (unsigned short)(++itr)->second;
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				previousCluster = itr->second;
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				++clusterCounter;
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			}
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		}
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		FatTable[previousCluster] = EOF16;
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		itr++;
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		++clusterCounter;
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	}
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	// Each FAT16 entries occupies 2 bytes, hence multiply by 2
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	std::string aFatString(reinterpret_cast<char*>(FatTable),clusterCounter*2);
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	delete[] FatTable;
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	if(clusterCounter < totalFatEntries)
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	{
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		// Each FAT16 entries occupies 2 bytes, hence multiply by 2
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		aFatString.append((totalFatEntries - clusterCounter)*2, 0);
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	}
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	MessageHandler::ReportMessage (INFORMATION,FATTABLEWRITEMSG,
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								   "FAT16");
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	// Write FAT table multiple times depending upon the No of FATS set.
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	unsigned int noOfFats = iFAT16BootSector.NumberOfFats();
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	for(unsigned int i=0; i<noOfFats; i++)
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	{
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		aOutPutStream.write(aFatString.c_str(),aFatString.length());
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	}
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	aFatString.erase();
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	aOutPutStream.flush();
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}
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/**
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set the cluster size in bytes,iClusterSize
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@internalComponent
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@released
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*/
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void CFat16FileSystem::ComputeClusterSizeInBytes()
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{
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	iClusterSize = (iFAT16BootSector.SectorsPerCluster()) * (iFAT16BootSector.BytesPerSector());
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}
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/**
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set the count of sectors occupied by the root directory,iRootDirSectors.
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@internalComponent
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@released
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*/
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void CFat16FileSystem::ComputeRootDirSectors()
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{
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	iRootDirSectors = (iFAT16BootSector.RootDirEntries() * (KDefaultRootDirEntrySize) + 
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					  (iFAT16BootSector.BytesPerSector() - 1)) / iFAT16BootSector.BytesPerSector();
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}	
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/**
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Initialize the Bytes per Sector variable value.
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@internalComponent
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@released
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*/
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void CFat16FileSystem::ComputeBytesPerSector()
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{
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	iBytesPerSector = iFAT16BootSector.BytesPerSector();
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}
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/**
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Compute the total number of clusters in Data segment of the FAT volume
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@internalComponent
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@released
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*/
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void CFat16FileSystem::ComputeTotalClusters(Long64 aPartitionSize)
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{
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	unsigned long int iTotalDataSectors = iFAT16BootSector.TotalSectors(aPartitionSize) - 
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										  ((iFAT16BootSector.NumberOfFats() * iFAT16BootSector.FatSectors()) + 
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										  iRootDirSectors + iFAT16BootSector.ReservedSectors());
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	iTotalClusters = iTotalDataSectors / iFAT16BootSector.SectorsPerCluster();
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	if(iTotalClusters < KMinimumFat16Clusters)
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	{
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		throw ErrorHandler(BOOTSECTORERROR,"Low Partition Size",__FILE__,__LINE__);
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	}
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	if(iTotalClusters > KMaximumFat16Clusters)
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	{
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		throw ErrorHandler(BOOTSECTORERROR,"High Partition Size",__FILE__,__LINE__);
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	}
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}
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/**
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This methods encapsulates the function call to write a complete FAT16 Image
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@internalComponent
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@released
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@param aPartitionSize partition size in bytes
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@param aNodeList Directory structure 
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@param aOutPutStream output stream for writing file image
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@param aImageFileName image file name 
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@param aLogFileName log file name 
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@param aConfigurableFatAttributes ConfigurableFatAttributes
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*/
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void CFat16FileSystem::Execute(Long64 aPartitionSize,EntryList aNodeList,ofstream& aOutPutStream,
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							   ConfigurableFatAttributes* aConfigurableFatAttributes)
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{
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	CDirRegion* dirRegionPtr = NULL;
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	try
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	{
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		CreateBootSector(aPartitionSize,aConfigurableFatAttributes);
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		ComputeTotalClusters(aPartitionSize);
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		WriteBootSector(aOutPutStream);
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		dirRegionPtr = new CDirRegion(aNodeList,this);
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		dirRegionPtr->Execute();
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		iClustersPerEntry = dirRegionPtr->GetClustersPerEntryMap();
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		CreateFatTable(aOutPutStream);
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		dirRegionPtr ->WriteClustersIntoFile(aOutPutStream);
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		delete dirRegionPtr ;
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	}
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	catch(ErrorHandler &aError)
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	{
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		delete dirRegionPtr;
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		//Re throw the same error message
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		throw ErrorHandler(aError.iMessageIndex,(char*)aError.iSubMessage.c_str(),(char*)aError.iFileName.c_str(),aError.iLineNumber);
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	}
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	/**
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	Irrespective of successful or unsuccessful data drive image generation ROFSBUILD
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	may try to generate images for successive ".oby" file input.
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	During this course unhandled exceptions may cause leaving some memory on heap 
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	unused. so the unhandled exceptions handling is used to free the memory allocated 
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	on heap. 
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	*/
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	catch(...)
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	{
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		delete dirRegionPtr;
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		throw ErrorHandler(UNKNOWNERROR, __FILE__, __LINE__);
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	}
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}