/*------------------------------------------------------------------------------
--  This file is a part of the libuc, microcontroler library
--  Copyright (C) 2012, Alexis Jeandet
--
--  This program is free software; you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation; either version 3 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program; if not, write to the Free Software
--  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
-------------------------------------------------------------------------------
--                 Author : Alexis Jeandet
--                   Mail : alexis.jeandet@gmail.com
-------------------------------------------------------------------------------*/
#ifndef FAT32_H
#define FAT32_H
#include <mbr.h>
#include <libucfs.h>
#include <ucdirent.h>
#include <stdint.h>
#include <stdint-gcc.h>
/*BPB (Boot Sector) Offsets  */

#define BS_jmpBootoff 		0
#define BS_OEMNameoff 		3
#define BPB_BytsPerSecoff 	11
#define BPB_SecPerClusoff	13
#define BPB_RsvdSecCntoff	14
#define BPB_NumFATsoff 		16
#define BPB_RootEntCntoff	17
#define BPB_TotSec16off		19
#define BPB_Mediaoff 		21
#define BPB_FATSz16off 		22
#define BPB_SecPerTrkoff	24
#define BPB_NumHeadsoff		26
#define BPB_HiddSecoff 		28
#define BPB_TotSec32off		32
/*FAT16*/
#define BS_DrvNumFAT16off	36
#define BS_Reserved1FAT16off	37
#define BS_BootSigFAT16off 	38
#define BS_VolIDFAT16off	39
#define BS_VolLabFAT16off	43
#define BS_FilSysTypeFAT16off 	54
/*FAT32*/
#define BPB_FATSz32off 		36
#define BPB_ExtFlagsoff		40
#define BPB_FSVeroff 		42
#define BPB_RootClusoff		44
#define BPB_FSInfooff 		48
#define BPB_BkBootSecoff	50
#define BPB_Reservedoff		52
#define BS_DrvNumFAT32off	64
#define BS_Reserved1FAT32off	65
#define BS_BootSigFAT32off 	66
#define BS_VolIDFAT32off	67
#define BS_VolLabFAT32off	71
#define BS_FilSysTypeFAT32off 	82


#define DIR_Nameoff             0
#define DIR_Attroff             0xb
#define DIR_FstClusHIoff        0x14
#define DIR_FstClusLOoff        0x1A
#define DIR_FileSizeoff         0x1c
#define DIR_CrtTimeTenthoff     13
#define DIR_CrtTimeoff          14
#define DIR_CrtDateoff          16
#define DIR_LstAccDateoff       18
#define DIR_WrtTimeoff          22
#define DIR_WrtDateoff          24



#define FATBadpart 1
#define FATBabArg 2
#define FATReadErr 3 
#define FATnoErr 0 

typedef struct FAT32fs
{
    uint16_t BPB_BytsPerSec;
    uint16_t BPB_RsvdSecCnt;
    uint32_t   BPB_FATSz32;
    uint32_t   BPB_RootClus;
    uint32_t   fat_begin_lba;
    uint32_t   cluster_begin_lba;
    uint8_t  BPB_SecPerClus;
    uint8_t  BPB_NumFATs;
	dikpartition*  part;
}FAT32fs;


#define castUI64(val) ((uint64_t)(val))
#define castUI32(val) ((uint32_t)(val))
#define castUI16(val) ((uint16_t)(val))
#define castUI8(val) ((uint8_t)(val))

#define castI64(val) ((int64_t)(val))
#define castI32(val) ((int32_t)(val))
#define castI16(val) ((int16_t)(val))
#define castI8(val) ((int8_t)(val))

#define fat32Ui8_2_Ui32(table,lsBindex) ((uint32_t)((0xFF&(table[lsBindex]))+(0xFF00&(((uint32_t)table[lsBindex+1])<<8))+(0xFF0000&(((uint32_t)table[lsBindex+2])<<16))+(0xFF000000&(((uint32_t)table[lsBindex+3])<<24))))
#define fat32Ui8_2_Ui16(table,lsBindex) ((uint16_t)((0xFF&(table[lsBindex]))+(0xFF00&(((uint16_t)table[lsBindex+1])<<8))))

/* Get the first sector lba of given cluster number*/
#define clusterlba(fs,cluster_number) ((uint32_t)fs->cluster_begin_lba + (((uint32_t)cluster_number) - (2)) * (uint32_t)fs->BPB_SecPerClus)

//#define fat32clusterinfatsect(fs,cluster_number) ((((uint32_t)(cluster_number))>>6) + fs->fat_begin_lba)
#define fat32clusterinfatsect(fs,cluster_number) ((((uint32_t)(cluster_number))>>7) + fs->fat_begin_lba)
#define fat32clusterinfatoff(cluster_number) (((cluster_number)&0x3F)*4)

/*Get cluster index in FAT Table from sector address*/
#define fat32masksectorlba(sectorlba,fs) (sectorlba & (castUI32(-1)^castUI32(fs->BPB_SecPerClus-1)))
#define fat32sectorlbatoclusternum(fs,sectorlba)  (((fat32masksectorlba(castUI32(sectorlba),fs) -(castUI32(fs->cluster_begin_lba)))/castUI32(fs->BPB_SecPerClus))+castUI32(2))

#define fat32extract16b(table, LSBOffset) (uint16_t)(( (uint16_t) ((uint8_t)table[(LSBOffset)]) ) + (uint16_t)( ((uint8_t)table[(LSBOffset)+1]) << 8 ))
#define fat32extract32b(table, LSBOffset) (uint32_t)(( (uint32_t) ((uint8_t)table[(LSBOffset)]) ) + (uint32_t)( ((uint8_t)table[(LSBOffset)+1]) << 8 )+ (uint32_t)( ((uint8_t)table[(LSBOffset)+2]) << 16 )+ (uint32_t)( ((uint8_t)table[(LSBOffset)+3]) << 24 ))

#ifdef FAT32_PRIVATE
#define fat32sectorreadout(fs,fatsec) \
    if((lastSecAddrs!=(fatsec)) || (lastFATFS!=(fs)))                 /*Check if sector already buffered*/ \
    {\
        if((fs)->part->phy->read((fs)->part->phy,fat32buff,(fatsec),1)!=RES_OK) \
        {\
            return DIRENT_ReadErr;\
        }\
    }\
    lastSecAddrs=(fatsec);\
    lastFATFS=(fs);
#endif

extern int fat32open(FAT32fs* fs,dikpartition* part);
extern int fat32mkdirent(FAT32fs* fs,ucdirent* dirent);
extern int fat32getVolName(FAT32fs* fs,char* Name);
extern int fat32getrootfirstent(ucdirent* entry);
extern int fat32nextdirent(ucdirent* entry);
extern int fat32nextsectorlba(FAT32fs* fs,uint32_t lastsector_lba,uint32_t* nextsector_lba);
extern int fat32prevsectorlba(FAT32fs* fs,uint32_t lastsector_lba,uint32_t *nextsector_lba);
extern uint32_t fat32getdirentlba(ucdirent* entry);
extern int fat32getdirentname(ucdirent* entry,char* nameBuffer);

#endif