// os345fat.h - file management system equates
#ifndef __os345fat_h__
#define __os345fat_h__
// ***************************************************************************************

typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint32;

//	size_t	uintptr_t

#define SECTORS_PER_DISK	2880
#define BYTES_PER_SECTOR   512
#define NUM_FAT_SECTORS		9
#define BEG_ROOT_SECTOR    19
#define BEG_DATA_SECTOR    33
#define CLUSTERS_PER_DISK  SECTORS_PER_DISK-BEG_DATA_SECTOR

#define BUFSIZE      512
#define NFILES       32          	// # of valid open files

#define READ_ONLY 0x01
#define HIDDEN    0x02
#define SYSTEM    0x04
#define VOLUME    0x08 					// this is the volume label entry
#define DIRECTORY 0x10
#define ARCHIVE   0x20 					// same as file
#define LONGNAME  (READ_ONLY | HIDDEN | SYSTEM | VOLUME)

#define OPEN_READ		0					// read only
#define OPEN_WRITE	1					// write only
#define OPEN_APPEND	2					// append
#define OPEN_RDWR		3					// read/write

#define ENTRIES_PER_SECTOR 16
#define FAT_EOC   4095
#define FAT_BAD   4087
#define C_2_S(c) (c+BEG_DATA_SECTOR-2)
#define S_2_C(s) (s-BEG_DATA_SECTOR+2)

#define BigEndian(v) 1?v:((((v)>>8)&0x00ff))|((v)<<8)
#define lLE(v) LITTLE?v:((BigEndian(v)<<16))|(BigEndian((v)>>16))

typedef struct
{
   uint16	free;	         	// # of sectors free
   uint16	used;	         	// # of sectors used
   uint16	bad;	         	// # of bad sectors
   uint16	size;	         	// Total # of sectors in RAM disk
} DiskSize;


#pragma pack(push,1)						// BYTE align in memory (no padding)
typedef struct
{
	uint8	name[8];	      	// file name
	uint8	extension[3];		// extension
	uint8	attributes;		   	// file attributes code
	uint16	directoryCluster;	// directory cluster
	uint16	startCluster;		// first cluster of the file
	uint16	currentCluster;		// current cluster in buffer
	uint32	fileSize;	   		// file size in bytes
	int		pid;				// process who opened file
	char	mode;				// access mode (read, read-only, write, append)
	char	flags;				// flags
								//   x80 = file altered
								//   x40 = buffer altered
								//   x20 = locked
								//   x10 =
								//   x08 = write protected
								//   x04 = contiguous
								//   x02 =
								//   x01 =
	uint32	fileIndex;			// next character position (from beg of file)
	char buffer[BYTES_PER_SECTOR];	// file buffer
} FDEntry;
#pragma pack(pop)							// End of strict alignment

#define FILE_ALTERED       0x80
#define BUFFER_ALTERED     0x40


#pragma pack(push,1)						// BYTE align in memory (no padding)
typedef struct
{
	uint8	BS_jmpBoot[3];		// Jump instruction to the boot code
	uint8 	BS_OEMName[8];		// Name of system that formatted the volume
	uint16	BPB_BytsPerSec;		// How many bytes in a sector (should be 512)
	uint8	BPB_SecPerClus;		// How many sectors are in a cluster (1)
	uint16	BPB_RsvdSecCnt;		// Number of sectors that are reserved (1)
	uint8	BPB_NumFATs;		// The number of FAT tables on the disk (2)
	uint16	BPB_RootEntCnt;		// Maximum # of directory entries in root directory
	uint16	BPB_TotSec16;		// FAT-12 total number of sectors on the disk
	uint8	BPB_Media;			// Code for media type {fixed, removable, etc.}
	uint16	BPB_FATSz16;		// FAT-12 # of sectors that each FAT occupies (9)
	uint16	BPB_SecPerTrk;		// Number of sectors in one cylindrical track
	uint16	BPB_NumHeads;		// Number of heads (2 heads for 1.4Mb 3.5" floppy)
	uint32	BPB_HiddSec;		// Number of preceding hidden sectors (0)
	uint32	BPB_TotSec32;		// FAT-32 number of sectors on the disk (0)
	uint8	BS_DrvNum;			// A drive number for the media (OS specific)
	uint8	BS_Reserved1;		// Reserved space for Windows NT (set to 0)
	uint8	BS_BootSig;			// Indicates following 3 fields are present (0x29)
	uint32	BS_VolID;			// Volume serial number (for tracking this disk)
	uint8	BS_VolLab[11];		// Volume label (matches rdl or "NO NAME    ")
	uint8	BS_FilSysType[8];	// Deceptive FAT type Label
	uint8	BS_fill[450];
} BSStruct;
#pragma pack(pop)							// End of strict alignment


// this struct may need to change for big endian
#pragma pack(push,1)			// BYTE align in memory (no padding)
typedef struct
{								// (total 16 bits--a uint16)
	uint16 sec: 5;				// low-order 5 bits are the seconds
	uint16 min: 6;				// next 6 bits are the minutes
	uint16 hour: 5;				// high-order 5 bits are the hour
} FATTime;
#pragma pack(pop)				// End of strict alignment


// this struct may need to change for big endian
#pragma pack(push,1)			// BYTE align in memory (no padding)
typedef struct
{								// (total 16 bits--a uint16)
   uint16 day: 5;				// low-order 5 bits are the day
   uint16 month: 4;				// next 4 bits are the month
   uint16 year: 7;				// high-order 7 bits are the year
} FATDate;
#pragma pack(pop)				// End of strict alignment

#pragma pack(push,1)			// BYTE align in memory (no padding)
typedef struct
{
	uint8	name[8];	      	// File name
	uint8	extension[3];		// Extension
	uint8	attributes;			// Holds the attributes code
	uint8	reserved[10];		// Reserved
	FATTime time;			    // Time of last write
	FATDate date;			    // Date of last write
	uint16	startCluster;		// Pointer to the first cluster of the file.
	uint32	fileSize;	   		// File size in bytes
} DirEntry;
#pragma pack(pop)				// End of strict alignment

typedef struct
{
   int error;
   char error_msg[32];
} FMSERROR;


// ***************************************************************************************
//	Prototypes
//
void dumpRAMDisk(char*, int, int);
void printDirectoryEntry(DirEntry*);
void printFatEntries(unsigned char*, int, int);
void setFatEntry(int FATindex, unsigned short FAT12ClusEntryVal, unsigned char* FAT);
unsigned short getFatEntry(int FATindex, unsigned char* FATtable);
int fmsMask(char* mask, char* name, char* ext);
void setDirTimeDate(DirEntry* dir);
int isValidFileName(char* fileName);

int fmsChangeDir(char*);
int fmsGetDirEntry(char*, DirEntry*);
int fmsGetNextDirEntry(int*, char*, DirEntry*, int);
int fmsCloseFile(int);
int fmsDefineFile(char*, int);
int fmsDeleteFile(char*);
int fmsOpenFile(char*, int);
int fmsReadFile(int, char*, int);
int fmsSeekFile(int, int);
int fmsWriteFile(int, char*, int);

int fmsLoadFile(char*, void*, int);
int fmsMount(char*, void*);
int fmsReadSector(void*, int);
int fmsWriteSector(void*, int);
int fmsUnMount(char*, void*);
void fmsError(int);
int fmsDiskStats(DiskSize* dskSize);

// ***************************************************************************************
//	FMS Errors

#define NUM_ERRORS   25

#define ERR50		-50
#define ERR51		-51
#define ERR52		-52
#define ERR53		-53
#define ERR54		-54
#define ERR55		-55

#define ERR60		-60
#define ERR61		-61
#define ERR62		-62
#define ERR63		-63
#define ERR64		-64
#define ERR65		-65
#define ERR66		-66
#define ERR67		-67
#define ERR68		-68
#define ERR69		-69

#define ERR70		-70
#define ERR71		-71
#define ERR72		-72

#define ERR80		-80
#define ERR81		-81
#define ERR82		-82
#define ERR83		-83
#define ERR84		-84
#define ERR85		-85

#define UNDEFINED	-1

#define ERR50_MSG "Invalid File Name"
#define ERR51_MSG "Invalid File Type"
#define ERR52_MSG "Invalid File Descriptor"
#define ERR53_MSG "Invalid Sector Number"
#define ERR54_MSG "Invalid FAT Chain"
#define ERR55_MSG "Invalid Directory"

#define ERR60_MSG "File Already Defined"
#define ERR61_MSG "File Not Defined"
#define ERR62_MSG "File Already Open"
#define ERR63_MSG "File Not Open"
#define ERR64_MSG "File Directory Full"
#define ERR65_MSG "File Space Full"
#define ERR66_MSG "End-Of-File"
#define ERR67_MSG "End-Of-Directory"
#define ERR68_MSG "Directory Not Found"
#define ERR69_MSG "Can Not Delete"

#define ERR70_MSG "Too Many Files Open"
#define ERR71_MSG "Not Enough Contiguous Space"
#define ERR72_MSG "Disk Not Mounted"

#define ERR80_MSG "File Seek Error"
#define ERR81_MSG "File Locked"
#define ERR82_MSG "File Delete Protected"
#define ERR83_MSG "File Write Protected"
#define ERR84_MSG "Read Only File"
#define ERR85_MSG "Illegal Access"

#define UNDEFINED_MSG "Undefined Error"

#endif // __os345fat_h__