/*
 * JR-IDE Project
 * - (c) 2017 Alan Hightower
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef __PIMOUNT_H__
#define __PIMOUNT_H__

#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <errno.h>
#include <stdio.h>
#include <libgen.h>

#include <dos.h>

#include "rpc.h"

extern int verbose;

#define VERSION_MAJOR   1
#define VERSION_MINOR   1

#define PIMOUNT_MAGIC   0x481a

#define LOGERR(fmt, ...) fprintf(stderr, "\nERROR: " fmt "\n\n", ## __VA_ARGS__)

#define FPDRF(ptr)  MK_FP(((ptr)[3] << 8) | (ptr)[2], ((ptr)[1] << 8) | (ptr)[0]);

#define SECTOR_SIZE     512


typedef enum
{
	DOS_SUCCESS      = 0,    // OK
	DOS_INVALID_FUNC = 1,    // Invalid function number
	DOS_FILENOTFND   = 2,    // File not found
	DOS_PATHNOTFND   = 3,    // Path not found
	DOS_TOOMANY      = 4,    // Too many open files
	DOS_ACCESS       = 5,    // Access denied
	DOS_INVLDHNDL    = 6,    // Invalid handle
	DOS_MCBDESTRY    = 7,    // Memory control blocks shot
	DOS_NOMEM        = 8,    // Insufficient memory
	DOS_INVLDMCB     = 9,    // Invalid memory control block
	DOS_INVLDENV     = 10,   // Invalid enviornment
	DOS_INVLDFMT     = 11,   // Invalid format
	DOS_INVLDACC     = 12,   // Invalid access
	DOS_INVLDDATA    = 13,   // Invalid data
	DOS_INVLDDRV     = 15,   // Invalid drive
	DOS_RMVCUDIR     = 16,   // Attempt remove current dir
	DOS_DEVICE       = 17,   // Not same device
	DOS_NFILES       = 18,   // No more files
	DOS_WRTPRTCT     = 19,   // Write protected
	DOS_UNKUNIT      = 20,   // Unknown unit     (FreeDOS defines this as DE_BLKINVLD "Invalid block")
	DOS_NOTREADY     = 21,   // Drive not ready
	DOS_UNKCMD       = 22,   // Unknown command
	DOS_CRCERR       = 23,   // Data error (CRC)
	DOS_INVLDBUF     = 24,   // invalid buffer size, ext fnc
	DOS_SEEK         = 25,   // error on file seek
	DOS_GENERAL      = 31,   // General failure
	DOS_SHARE        = 32,   // Sharing violation
	DOS_ENOSPACE     = 39,   // Disk full (In FreeDOS it's 28)
	DOS_FILEEXISTS   = 80,         
	DOS_INVLDPARM    = 87,   // Invalid parameter

} DOS_ERRORS;


// Extended Open actions
//
#define EXTENDED_CREATE		0x10
#define EXTENDED_OPEN		0x01
#define EXTENDED_REPLACE	0x02


#pragma pack(push, 1)

typedef struct // 88 bytes - DOS drive list
{
	uint8_t path[67];               // eg. D:\SOMEDIR\...

	uint16_t flags;

	uint8_t far *dpb;

	void far *context;
	uint16_t magic;

	uint16_t bsoffset;

	uint8_t pad[7];

} dlist_t;


// DOS 2+ Search Data Block entry used by Int 21/AH=4Eh
//   http://www.ctyme.com/intr/rb-2977.htm#Table1626
//   21 bytes - Search data block 01626 at ah=4e

typedef struct
{
	uint8_t driveno;        // 00: drive letter / remote if bit 7 set
	char search_mask[11];   // 01:
	uint8_t attr_mask;      // 0c: search attributes
	uint16_t entryno;       // 0d: entry count within directory

} SDB_t;


// DOS 2+ Find Data Block entry used by Int 21/AH=4Eh
//   http://www.ctyme.com/intr/rb-2576.htm#Table1352
//   directory entry for found file - see 01352 at ah=11

typedef struct
{
	char     name[11];     // 00: found file name
	uint8_t  attr;         // 0b: file attributes
	uint8_t  reserved;     // 0c:
	uint8_t  time_deca;    // 0d: Tenths of a second
	uint16_t ctime;        // 0e: time of creation
	uint16_t cdate;        // 10: date of creation
	uint16_t adate;        // 12: date of last access
	uint16_t cluster_hi;   // 14: start cluster number (high word)
	uint16_t mtime;        // 16: time of last update [hhhhhmmm mmmsssss]
	uint16_t mdate;        // 18: data of last update [YYYYYYYM MMMDDDDD]
	uint16_t cluster_lo;   // 1a: start cluster number (low word)
	uint32_t size;         // 1c: file size

} FDB_t;

#define DOS_ATTR_READ_ONLY  0x01
#define DOS_ATTR_HIDDEN     0x02
#define DOS_ATTR_SYSTEM     0x04
#define DOS_ATTR_VOLUME_ID  0x08
#define DOS_ATTR_DIRECTORY  0x10
#define DOS_ATTR_ARCHIVE    0x20


#pragma pack(pop)

typedef struct
{
#define SIGNATURE_TEXT   "JRIDE_PIMOUNT"

	char signature[14];           // 000: NULL terminated SIGNATURE_TEXT

	uint8_t driveno;              // 00e: 0=A, 1=B, 2=C, etc...
	uint8_t reserved1;            // 00f:

	uint16_t psp;                 // 010: Our PSP
	uint8_t prev_pull;            // 012: Previous pull command to pi
	uint8_t reserved2;            // 013:

	void far *curr_handler;       // 014: Our redirector
	void far *prev_handler;       // 018: Previous/chain redirector

	dlist_t far *drive;           // 01c: Drive list entry
	char far *path;               // 020: Current path

	uint8_t far *sda;             // 024: DOS Swappable Disk Area (SDA)
	uint8_t far *filename1;       // 028: SDA - file name argument 1
	uint8_t far *filename2;       // 02c: SDA - file name argument 2
	SDB_t far *sdb;               // 030: SDA - search data block (find)
	FDB_t far *fdb;               // 034: SDA - find data block entry
	char far *fcbname1;           // 038: SDA - file control block 1
	char far *fcbname2;           // 03c: SDA - file control block 2

	uint16_t unicode[128];        // 040: Current code page for name xlat

	uint8_t scratch[512];         // 100: Transfer to/from IDE scratch buff

} ctx_t; // 768 bytes

extern ctx_t ctx;

extern volatile uint16_t far *ide_sector;
extern volatile  uint8_t far *ide_window;

extern uint16_t _get_resident_psize (void);

extern void __interrupt redirector (union INTPACK );

extern int _redir_pull (uint8_t subcmd);
extern int _redir_push (uint8_t subcmd);

#endif