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527f2f9057
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
132 lines
4.8 KiB
C
132 lines
4.8 KiB
C
/*****************************************************************************
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* FullFAT - High Performance, Thread-Safe Embedded FAT File-System *
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* Copyright (C) 2009 James Walmsley (james@worm.me.uk) *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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* *
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* IMPORTANT NOTICE: *
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* ================= *
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* Alternative Licensing is available directly from the Copyright holder, *
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* (James Walmsley). For more information consult LICENSING.TXT to obtain *
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* a Commercial license. *
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* *
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* See RESTRICTIONS.TXT for extra restrictions on the use of FullFAT. *
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* *
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* Removing the above notice is illegal and will invalidate this license. *
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*****************************************************************************
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* See http://worm.me.uk/fullfat for more information. *
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* Or http://fullfat.googlecode.com/ for latest releases and the wiki. *
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*****************************************************************************/
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/**
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* @file ff_format.c
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* @author James Walmsley
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* @ingroup FORMAT
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*
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* @defgroup FORMAT Independent FAT Formatter
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* @brief Provides an interface to format a partition with FAT.
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*
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*
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*
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**/
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#include "ff_format.h"
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#include "ff_types.h"
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#include "ff_ioman.h"
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#include "ff_fatdef.h"
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static FF_T_SINT8 FF_PartitionCount (FF_T_UINT8 *pBuffer)
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{
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FF_T_SINT8 count = 0;
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FF_T_SINT8 part;
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// Check PBR or MBR signature
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if (FF_getChar(pBuffer, FF_FAT_MBR_SIGNATURE) != 0x55 &&
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FF_getChar(pBuffer, FF_FAT_MBR_SIGNATURE) != 0xAA ) {
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// No MBR, but is it a PBR ?
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if (FF_getChar(pBuffer, 0) == 0xEB && // PBR Byte 0
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FF_getChar(pBuffer, 2) == 0x90 && // PBR Byte 2
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(FF_getChar(pBuffer, 21) & 0xF0) == 0xF0) {// PBR Byte 21 : Media byte
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return 1; // No MBR but PBR exist then only one partition
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}
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return 0; // No MBR and no PBR then no partition found
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}
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for (part = 0; part < 4; part++) {
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FF_T_UINT8 active = FF_getChar(pBuffer, FF_FAT_PTBL + FF_FAT_PTBL_ACTIVE + (16 * part));
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FF_T_UINT8 part_id = FF_getChar(pBuffer, FF_FAT_PTBL + FF_FAT_PTBL_ID + (16 * part));
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// The first sector must be a MBR, then check the partition entry in the MBR
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if (active != 0x80 && (active != 0 || part_id == 0)) {
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break;
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}
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count++;
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}
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return count;
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}
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FF_ERROR FF_FormatPartition(FF_IOMAN *pIoman, FF_T_UINT32 ulPartitionNumber, FF_T_UINT32 ulClusterSize) {
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FF_BUFFER *pBuffer;
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FF_T_UINT8 ucPartitionType;
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FF_T_SINT8 scPartitionCount;
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FF_T_UINT32 /*ulPartitionBeginLBA, ulPartitionLength,*/ ulPnum;
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FF_ERROR Error = FF_ERR_NONE;
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ulClusterSize = 0;
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// Get Partition Metrics, and pass on to FF_Format() function
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pBuffer = FF_GetBuffer(pIoman, 0, FF_MODE_READ);
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{
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if(!pBuffer) {
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return FF_ERR_DEVICE_DRIVER_FAILED;
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}
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scPartitionCount = FF_PartitionCount(pBuffer->pBuffer);
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ucPartitionType = FF_getChar(pBuffer->pBuffer, FF_FAT_PTBL + FF_FAT_PTBL_ID);
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if(ucPartitionType == 0xEE) {
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// Handle Extended Partitions
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ulPnum = 0;
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} else {
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if(ulPartitionNumber > (FF_T_UINT32) scPartitionCount) {
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FF_ReleaseBuffer(pIoman, pBuffer);
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return FF_ERR_IOMAN_INVALID_PARTITION_NUM;
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}
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ulPnum = ulPartitionNumber;
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}
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}
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FF_ReleaseBuffer(pIoman, pBuffer);
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return Error;
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}
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FF_ERROR FF_Format(FF_IOMAN *pIoman, FF_T_UINT32 ulStartLBA, FF_T_UINT32 ulEndLBA, FF_T_UINT32 ulClusterSize) {
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FF_T_UINT32 ulTotalSectors;
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FF_T_UINT32 ulTotalClusters;
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ulTotalSectors = ulEndLBA - ulStartLBA;
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ulTotalClusters = ulTotalSectors / (ulClusterSize / pIoman->BlkSize);
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return -1;
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} |