author | Richard Taylor <richard.i.taylor@nokia.com> |
Thu, 18 Mar 2010 15:12:39 +0000 | |
branch | wip |
changeset 381 | 8052c8afe93e |
parent 0 | 044383f39525 |
child 590 | 360bd6b35136 |
permissions | -rw-r--r-- |
0
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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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|
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#include"fat16filesystem.h" |
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|
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|
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/** |
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Initializes the boot sector of a FAT 16 volume |
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|
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@internalComponent |
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@released |
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|
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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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131 |
|
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132 |
|
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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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137 |
} |
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138 |
|
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139 |
/** |
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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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142 |
|
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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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154 |
|
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155 |
@internalComponent |
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@released |
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157 |
|
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@param ofstream |
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159 |
*/ |
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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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172 |
*/ |
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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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178 |
{ |
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for(unsigned int i = 1; i < iClustersPerEntry->count(itr->first); i++) |
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180 |
{ |
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181 |
FatTable[previousCluster] = (unsigned short)(++itr)->second; |
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previousCluster = itr->second; |
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183 |
++clusterCounter; |
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184 |
} |
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185 |
} |
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186 |
FatTable[previousCluster] = EOF16; |
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187 |
itr++; |
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188 |
++clusterCounter; |
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189 |
} |
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190 |
// Each FAT16 entries occupies 2 bytes, hence multiply by 2 |
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191 |
std::string aFatString(reinterpret_cast<char*>(FatTable),clusterCounter*2); |
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192 |
delete[] FatTable; |
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193 |
if(clusterCounter < totalFatEntries) |
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194 |
{ |
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195 |
// Each FAT16 entries occupies 2 bytes, hence multiply by 2 |
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196 |
aFatString.append((totalFatEntries - clusterCounter)*2, 0); |
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197 |
} |
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198 |
MessageHandler::ReportMessage (INFORMATION,FATTABLEWRITEMSG, |
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199 |
"FAT16"); |
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200 |
|
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201 |
// Write FAT table multiple times depending upon the No of FATS set. |
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202 |
unsigned int noOfFats = iFAT16BootSector.NumberOfFats(); |
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203 |
for(unsigned int i=0; i<noOfFats; i++) |
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204 |
{ |
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205 |
aOutPutStream.write(aFatString.c_str(),aFatString.length()); |
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206 |
} |
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207 |
|
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208 |
aFatString.erase(); |
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209 |
aOutPutStream.flush(); |
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210 |
} |
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211 |
|
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212 |
/** |
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213 |
set the cluster size in bytes,iClusterSize |
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214 |
|
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215 |
@internalComponent |
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216 |
@released |
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217 |
*/ |
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218 |
void CFat16FileSystem::ComputeClusterSizeInBytes() |
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219 |
{ |
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iClusterSize = (iFAT16BootSector.SectorsPerCluster()) * (iFAT16BootSector.BytesPerSector()); |
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221 |
} |
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222 |
|
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223 |
/** |
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224 |
set the count of sectors occupied by the root directory,iRootDirSectors. |
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225 |
|
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226 |
@internalComponent |
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227 |
@released |
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228 |
*/ |
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229 |
void CFat16FileSystem::ComputeRootDirSectors() |
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230 |
{ |
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231 |
iRootDirSectors = (iFAT16BootSector.RootDirEntries() * (KDefaultRootDirEntrySize) + |
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232 |
(iFAT16BootSector.BytesPerSector() - 1)) / iFAT16BootSector.BytesPerSector(); |
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233 |
} |
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234 |
|
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235 |
/** |
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236 |
Initialize the Bytes per Sector variable value. |
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237 |
|
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238 |
@internalComponent |
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239 |
@released |
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240 |
*/ |
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241 |
void CFat16FileSystem::ComputeBytesPerSector() |
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242 |
{ |
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243 |
iBytesPerSector = iFAT16BootSector.BytesPerSector(); |
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244 |
} |
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245 |
|
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246 |
|
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247 |
/** |
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248 |
Compute the total number of clusters in Data segment of the FAT volume |
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249 |
|
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250 |
@internalComponent |
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251 |
@released |
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252 |
*/ |
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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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|
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/** |
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This methods encapsulates the function call to write a complete FAT16 Image |
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|
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@internalComponent |
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@released |
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|
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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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|
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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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} |