author | timothy.murphy@nokia.com |
Fri, 16 Apr 2010 11:57:28 +0100 | |
branch | fix |
changeset 485 | 926e968477c6 |
parent 0 | 044383f39525 |
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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* 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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|
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#include "fat16bootsector.h" |
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|
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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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/** |
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Destructor of the fat16 boot sector class |
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|
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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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|
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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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|
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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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|
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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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|
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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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/** |
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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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} |