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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2012, Alexis Jeandet
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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, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@gmail.com
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-------------------------------------------------------------------------------*/
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#ifndef FAT32_H
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#define FAT32_H
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#include <mbr.h>
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#include <fs.h>
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#include <ucdirent.h>
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/*BPB (Boot Sector) Offsets */
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#define BS_jmpBootoff 0
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#define BS_OEMNameoff 3
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#define BPB_BytsPerSecoff 11
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#define BPB_SecPerClusoff 13
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#define BPB_RsvdSecCntoff 14
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#define BPB_NumFATsoff 16
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#define BPB_RootEntCntoff 17
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#define BPB_TotSec16off 19
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#define BPB_Mediaoff 21
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#define BPB_FATSz16off 22
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#define BPB_SecPerTrkoff 24
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#define BPB_NumHeadsoff 26
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#define BPB_HiddSecoff 28
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#define BPB_TotSec32off 32
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/*FAT16*/
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#define BS_DrvNumFAT16off 36
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#define BS_Reserved1FAT16off 37
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#define BS_BootSigFAT16off 38
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#define BS_VolIDFAT16off 39
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#define BS_VolLabFAT16off 43
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#define BS_FilSysTypeFAT16off 54
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/*FAT32*/
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#define BPB_FATSz32off 36
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#define BPB_ExtFlagsoff 40
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#define BPB_FSVeroff 42
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#define BPB_RootClusoff 44
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#define BPB_FSInfooff 48
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#define BPB_BkBootSecoff 50
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#define BPB_Reservedoff 52
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#define BS_DrvNumFAT32off 64
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#define BS_Reserved1FAT32off 65
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#define BS_BootSigFAT32off 66
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#define BS_VolIDFAT32off 67
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#define BS_VolLabFAT32off 71
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#define BS_FilSysTypeFAT32off 82
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#define DIR_Nameoff 0
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#define DIR_Attroff 0xb
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#define DIR_FstClusHIoff 0x14
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#define DIR_FstClusLOoff 0x1A
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#define DIR_FileSizeoff 0x1c
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#define DIR_CrtTimeTenthoff 13
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#define DIR_CrtTimeoff 14
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#define DIR_CrtDateoff 16
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#define DIR_LstAccDateoff 18
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#define DIR_WrtTimeoff 22
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#define DIR_WrtDateoff 24
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#define FATBadpart 1
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#define FATBabArg 2
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#define FATReadErr 3
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#define FATnoErr 0
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struct FAT32part_str
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{
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unsigned short BPB_BytsPerSec;
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unsigned short BPB_RsvdSecCnt;
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unsigned int BPB_FATSz32;
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unsigned int BPB_RootClus;
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unsigned int fat_begin_lba;
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unsigned int cluster_begin_lba;
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unsigned char BPB_SecPerClus;
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unsigned char BPB_NumFATs;
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dikpartition* part;
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};
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typedef volatile struct FAT32part_str FAT32fs;
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#define clusterlba(fs,cluster_number) ((unsigned int)fs->cluster_begin_lba + (((unsigned int)cluster_number) - (2)) * (unsigned int)fs->BPB_SecPerClus)
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#define fat32clusterinfatsect(fs,cluster_number) ((((unsigned int)(cluster_number))>>6) + fs->fat_begin_lba)
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#define fat32clusterinfatoff(cluster_number) (((cluster_number)&0x3F)*4)
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#define fat32sectorlbatoclusternum(fs,sectorlba) ((((((unsigned int)sectorlba & (-1^(fs->BPB_SecPerClus-1))))-((unsigned int)fs->cluster_begin_lba))/(unsigned int)fs->BPB_SecPerClus)+(2))
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extern int fat32open(FAT32fs* fs,dikpartition* part);
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extern int fat32mkdirent(FAT32fs* fs,ucdirent* dirent);
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extern int fat32getrootfirstent(ucdirent* entry);
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extern int fat32nextdirent(ucdirent* entry);
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extern int fat32nextsectorlba(FAT32fs* fs,unsigned int lastsector_lba,unsigned int* nextsector_lba);
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extern unsigned int fat32getdirentlba(ucdirent* entry);
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#endif
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