ReactOS Development > Doxygen

00001 /*****************************************************************************
00002  *  FullFAT - High Performance, Thread-Safe Embedded FAT File-System         *
00003  *  Copyright (C) 2009  James Walmsley (james@worm.me.uk)                    *
00004  *                                                                           *
00005  *  This program is free software: you can redistribute it and/or modify     *
00006  *  it under the terms of the GNU General Public License as published by     *
00007  *  the Free Software Foundation, either version 3 of the License, or        *
00008  *  (at your option) any later version.                                      *
00009  *                                                                           *
00010  *  This program is distributed in the hope that it will be useful,          *
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
00013  *  GNU General Public License for more details.                             *
00014  *                                                                           *
00015  *  You should have received a copy of the GNU General Public License        *
00016  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.    *
00017  *                                                                           *
00018  *  IMPORTANT NOTICE:                                                        *
00019  *  =================                                                        *
00020  *  Alternative Licensing is available directly from the Copyright holder,   *
00021  *  (James Walmsley). For more information consult LICENSING.TXT to obtain   *
00022  *  a Commercial license.                                                    *
00023  *                                                                           *
00024  *  See RESTRICTIONS.TXT for extra restrictions on the use of FullFAT.       *
00025  *                                                                           *
00026  *  Removing the above notice is illegal and will invalidate this license.   *
00027  *****************************************************************************
00028  *  See http://worm.me.uk/fullfat for more information.                      *
00029  *  Or  http://fullfat.googlecode.com/ for latest releases and the wiki.     *
00030  *****************************************************************************/
00031 
00043 #include "ff_blk.h"
00047 FF_T_UINT32 FF_getClusterChainNumber(FF_IOMAN *pIoman, FF_T_UINT32 nEntry, FF_T_UINT16 nEntrySize) {
00048     FF_PARTITION *pPart             = pIoman->pPartition;
00049     FF_T_UINT32 clusterChainNumber  = nEntry / (pIoman->BlkSize * (pPart->SectorsPerCluster * pPart->BlkFactor) / nEntrySize);
00050     return clusterChainNumber;
00051 }
00052 
00053 FF_T_UINT32 FF_getClusterPosition(FF_IOMAN *pIoman, FF_T_UINT32 nEntry, FF_T_UINT16 nEntrySize) {
00054     return nEntry % ((pIoman->BlkSize * (pIoman->pPartition->SectorsPerCluster * pIoman->pPartition->BlkFactor)) / nEntrySize);
00055 }
00059 FF_T_UINT32 FF_getMajorBlockNumber(FF_IOMAN *pIoman, FF_T_UINT32 nEntry, FF_T_UINT16 nEntrySize) {
00060     FF_PARTITION *pPart = pIoman->pPartition;
00061     FF_T_UINT32 relClusterEntry     = nEntry % (pIoman->BlkSize * (pPart->SectorsPerCluster * pPart->BlkFactor) / nEntrySize);
00062     FF_T_UINT32 majorBlockNumber    = relClusterEntry / (pPart->BlkSize / nEntrySize);
00063     return majorBlockNumber;
00064 }
00068 FF_T_UINT8 FF_getMinorBlockNumber(FF_IOMAN *pIoman, FF_T_UINT32 nEntry, FF_T_UINT16 nEntrySize) {
00069     FF_PARTITION *pPart             = pIoman->pPartition;
00070     FF_T_UINT32 relClusterEntry     = nEntry % (pIoman->BlkSize * (pPart->SectorsPerCluster * pPart->BlkFactor) / nEntrySize);
00071     FF_T_UINT16 relmajorBlockEntry  = (FF_T_UINT16)(relClusterEntry % (pPart->BlkSize / nEntrySize));
00072     FF_T_UINT8 minorBlockNumber     = (FF_T_UINT8) (relmajorBlockEntry / (pIoman->BlkSize / nEntrySize));
00073     return minorBlockNumber;
00074 }
00078 FF_T_UINT32 FF_getMinorBlockEntry(FF_IOMAN *pIoman, FF_T_UINT32 nEntry, FF_T_UINT16 nEntrySize) {
00079     FF_PARTITION *pPart             = pIoman->pPartition;
00080     FF_T_UINT32 relClusterEntry     = nEntry % (pIoman->BlkSize * (pPart->SectorsPerCluster * pPart->BlkFactor) / nEntrySize);
00081     FF_T_UINT32 relmajorBlockEntry  = (FF_T_UINT32)(relClusterEntry % (pPart->BlkSize / nEntrySize));
00082     FF_T_UINT32 minorBlockEntry     = (FF_T_UINT32)(relmajorBlockEntry % (pIoman->BlkSize / nEntrySize));
00083     return minorBlockEntry;
00084 }
00085
Generated on Sun May 27 2012 04:34:05 for ReactOS by
1.7.6.1