/disk.cpp

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/*
* UAE - The Un*x Amiga Emulator
*
* Floppy disk emulation
*
* Copyright 1995 Hannu Rummukainen
* Copyright 1995-2001 Bernd Schmidt
* Copyright 2000-2021 Toni Wilen
*
* Original High Density Drive Handling by Dr. Adil Temel (C) 2001 [atemel1@hotmail.com]
*
* Small modifications to support abstracted Floppy Disk "Bridges" to hardware, Copyright 2021 Robert Smith, https://amiga.robsmithdev.co.uk
*
*/

#include "sysconfig.h"
#include "sysdeps.h"

int disk_debug_logging = 0;
int disk_debug_mode = 0;
int disk_debug_track = -1;

#define REVOLUTION_DEBUG 0
#define MFM_VALIDATOR 0

#include "uae.h"
#include "options.h"
#include "memory.h"
#include "events.h"
#include "custom.h"
#include "disk.h"
#include "gui.h"
#include "zfile.h"
#include "newcpu.h"
#include "osemu.h"
#include "execlib.h"
#include "savestate.h"
#include "cia.h"
#include "debug.h"
#ifdef FDI2RAW
#include "fdi2raw.h"
#endif
#include "catweasel.h"
#include "driveclick.h"
#ifdef CAPS
#include "caps/caps_win32.h"
#endif
#ifdef SCP
#include "scp.h"
#endif
#include "crc32.h"
#include "inputrecord.h"
#include "amax.h"
#ifdef RETROPLATFORM
#include "rp.h"
#endif
#include "fsdb.h"
#include "statusline.h"
#include "rommgr.h"
#include "tinyxml2.h"
#ifdef FLOPPYBRIDGE
#include "floppybridge/floppybridge_abstract.h"
#include "floppybridge/floppybridge_lib.h"
#endif

#undef CATWEASEL

int floppy_writemode = 0;

/* support HD floppies */
#define FLOPPY_DRIVE_HD
/* Writable track length with normal 2us bitcell/300RPM motor, 12688 PAL, 12784 NTSC */
/* DMA clock / (7 clocks per bit * 5 revs per second * 8 bits per byte) */
#define FLOPPY_WRITE_LEN_PAL 12668 // 3546895 / (7 * 5 * 8)
#define FLOPPY_WRITE_LEN_NTSC 12784 // 3579545 / (7 * 5 * 8)
#define FLOPPY_WRITE_LEN (currprefs.floppy_write_length > 256 ? currprefs.floppy_write_length / 2 : (currprefs.ntscmode ? (FLOPPY_WRITE_LEN_NTSC / 2) : (FLOPPY_WRITE_LEN_PAL / 2)))
#define FLOPPY_WRITE_MAXLEN 0x3800
/* This works out to 350 PAL, 408 NTSC */
#define FLOPPY_GAP_LEN (FLOPPY_WRITE_LEN - 11 * 544)
/* 7 CCK per bit */
#define NORMAL_FLOPPY_SPEED (7 * 256)
/* max supported floppy drives, for small memory systems */
#define MAX_FLOPPY_DRIVES 4

#ifdef FLOPPY_DRIVE_HD
#define DDHDMULT 2
#else
#define DDHDMULT 1
#endif
#define MAX_SECTORS (DDHDMULT * 11)

#undef DEBUG_DRIVE_ID

/* UAE-1ADF (ADF_EXT2)
* W reserved
* W number of tracks (default 2*80=160)
*
* W reserved
* W type, 0=normal AmigaDOS track, 1 = raw MFM (upper byte = disk revolutions - 1)
* L available space for track in bytes (must be even)
* L track length in bits
*/

static int side, direction, reserved_side;
static uae_u8 selected = 15, disabled, reserved;

static uae_u8 writebuffer[544 * MAX_SECTORS];
static uae_u8 writesecheadbuffer[16 * MAX_SECTORS];

#define DISK_INDEXSYNC 1
#define DISK_WORDSYNC 2
#define DISK_REVOLUTION 4 /* 8,16,32,64 */

#define DSKREADY_UP_TIME 18
#define DSKREADY_DOWN_TIME 24

#define DSKDMA_OFF 0
#define DSKDMA_INIT 1
#define DSKDMA_READ 2
#define DSKDMA_WRITE 3

static int dskdmaen, dsklength, dsklength2, dsklen;
static uae_u16 dskbytr_val;
static uae_u32 dskpt;
static bool fifo_filled;
static uae_u16 fifo[3];
static int fifo_inuse[3];
static int dma_enable, bitoffset, syncoffset;
static uae_u16 word, dsksync;
static unsigned long dsksync_cycles;
#define WORDSYNC_TIME 11
/* Always carried through to the next line.  */
int disk_hpos;
static int disk_jitter;
static int indexdecay;
static uae_u8 prev_data;
static int prev_step;
static bool initial_disk_statusline;
static struct diskinfo disk_info_data = { 0 };
static bool amax_enabled;

typedef enum { TRACK_AMIGADOS, TRACK_RAW, TRACK_RAW1, TRACK_PCDOS, TRACK_DISKSPARE, TRACK_NONE } image_tracktype;
typedef struct {
	uae_u16 len;
	int offs, extraoffs;
	int bitlen, track;
	uae_u16 sync;
	image_tracktype type;
	int revolutions;
} trackid;

#define MAX_TRACKS (2 * 83)

/* We have three kinds of Amiga floppy drives
* - internal A500/A2000 drive:
*   ID is always DRIVE_ID_NONE (S.T.A.G expects this)
* - HD drive (A3000/A4000):
*   ID is DRIVE_ID_35DD if DD floppy is inserted or drive is empty
*   ID is DRIVE_ID_35HD if HD floppy is inserted
* - regular external drive:
*   ID is always DRIVE_ID_35DD
*/

#define DRIVE_ID_NONE  0x00000000
#define DRIVE_ID_35DD  0xFFFFFFFF
#define DRIVE_ID_35HD  0xAAAAAAAA
#define DRIVE_ID_525SD 0x55555555 /* 40 track 5.25 drive , kickstart does not recognize this */

typedef enum { ADF_NONE = -1, ADF_NORMAL, ADF_EXT1, ADF_EXT2, ADF_FDI, ADF_IPF, ADF_SCP, ADF_CATWEASEL, ADF_PCDOS, ADF_KICK, ADF_SKICK, ADF_NORMAL_HEADER, ADF_FLOPPYBRIDGE } drive_filetype;
typedef struct {
	struct zfile *diskfile;
	struct zfile *writediskfile;
	struct zfile *pcdecodedfile;
	drive_filetype filetype;
	trackid trackdata[MAX_TRACKS];
	trackid writetrackdata[MAX_TRACKS];
	int buffered_cyl, buffered_side;
	int cyl;
	bool motoroff;
	int motordelay; /* dskrdy needs some clock cycles before it changes after switching off motor */
	bool state;
	int selected_delay;
	bool wrprot;
	bool forcedwrprot;
	uae_u16 bigmfmbuf[0x4000 * DDHDMULT];
	uae_u16 tracktiming[0x4000 * DDHDMULT];
	int multi_revolution;
	int revolution_check;
	int skipoffset;
	int mfmpos;
	int indexoffset;
	int tracklen;
	int revolutions;
	int prevtracklen;
	int trackspeed;
	int num_tracks, write_num_tracks, num_secs, num_heads;
	int hard_num_cyls;
	bool dskeject;
	bool dskchange;
	int dskchange_time;
	bool dskready;
	int dskready_up_time;
	int dskready_down_time;
	int writtento;
	int steplimit;
	frame_time_t steplimitcycle;
	int indexhack, indexhackmode;
	int ddhd; /* 1=DD 2=HD */
	int drive_id_scnt; /* drive id shift counter */
	int idbit;
	unsigned long drive_id; /* drive id to be reported */
	TCHAR newname[256]; /* storage space for new filename during eject delay */
	bool newnamewriteprotected;
	uae_u32 crc32;
#ifdef FDI2RAW
	FDI *fdi;
#endif
	int useturbo;
	int floppybitcounter; /* number of bits left */
#ifdef CATWEASEL
	catweasel_drive *catweasel;
#else
	int catweasel;
	int amax;
	int lastdataacesstrack;
	int lastrev;
	bool track_access_done;
	bool fourms;
#endif
#ifdef FLOPPYBRIDGE
	FloppyDiskBridge *bridge;
	bool writepending;
#endif
} drive;

#define MIN_STEPLIMIT_CYCLE (CYCLE_UNIT * 140)

static uae_u16 bigmfmbufw[0x4000 * DDHDMULT];
static drive floppy[MAX_FLOPPY_DRIVES];
static TCHAR dfxhistory[HISTORY_MAX][MAX_PREVIOUS_IMAGES][MAX_DPATH];

static uae_u8 exeheader[]={0x00,0x00,0x03,0xf3,0x00,0x00,0x00,0x00};
static uae_u8 bootblock_ofs[]={
	0x44,0x4f,0x53,0x00,0xc0,0x20,0x0f,0x19,0x00,0x00,0x03,0x70,0x43,0xfa,0x00,0x18,
	0x4e,0xae,0xff,0xa0,0x4a,0x80,0x67,0x0a,0x20,0x40,0x20,0x68,0x00,0x16,0x70,0x00,
	0x4e,0x75,0x70,0xff,0x60,0xfa,0x64,0x6f,0x73,0x2e,0x6c,0x69,0x62,0x72,0x61,0x72,
	0x79
};
static uae_u8 bootblock_ffs[]={
	0x44, 0x4F, 0x53, 0x01, 0xE3, 0x3D, 0x0E, 0x72, 0x00, 0x00, 0x03, 0x70, 0x43, 0xFA, 0x00, 0x3E,
	0x70, 0x25, 0x4E, 0xAE, 0xFD, 0xD8, 0x4A, 0x80, 0x67, 0x0C, 0x22, 0x40, 0x08, 0xE9, 0x00, 0x06,
	0x00, 0x22, 0x4E, 0xAE, 0xFE, 0x62, 0x43, 0xFA, 0x00, 0x18, 0x4E, 0xAE, 0xFF, 0xA0, 0x4A, 0x80,
	0x67, 0x0A, 0x20, 0x40, 0x20, 0x68, 0x00, 0x16, 0x70, 0x00, 0x4E, 0x75, 0x70, 0xFF, 0x4E, 0x75,
	0x64, 0x6F, 0x73, 0x2E, 0x6C, 0x69, 0x62, 0x72, 0x61, 0x72, 0x79, 0x00, 0x65, 0x78, 0x70, 0x61,
	0x6E, 0x73, 0x69, 0x6F, 0x6E, 0x2E, 0x6C, 0x69, 0x62, 0x72, 0x61, 0x72, 0x79, 0x00, 0x00, 0x00,
};

#define FS_OFS_DATABLOCKSIZE 488
#define FS_FLOPPY_BLOCKSIZE 512
#define FS_EXTENSION_BLOCKS 72
#define FS_FLOPPY_TOTALBLOCKS 1760
#define FS_FLOPPY_RESERVED 2

static void writeimageblock (struct zfile *dst, uae_u8 *sector, int offset)
{
	zfile_fseek (dst, offset, SEEK_SET);
	zfile_fwrite (sector, FS_FLOPPY_BLOCKSIZE, 1, dst);
}

static uae_u32 disk_checksum (uae_u8 *p, uae_u8 *c)
{
	uae_u32 cs = 0;
	int i;
	for (i = 0; i < FS_FLOPPY_BLOCKSIZE; i+= 4)
		cs += (p[i] << 24) | (p[i+1] << 16) | (p[i+2] << 8) | (p[i+3] << 0);
	cs = (~cs) + 1;
	if (c) {
		c[0] = cs >> 24; c[1] = cs >> 16; c[2] = cs >> 8; c[3] = cs >> 0;
	}
	return cs;
}

static int dirhash (const uae_char *name)
{
	unsigned long hash;
	int i;

	hash = strlen (name);
	for(i = 0; i < strlen (name); i++) {
		hash = hash * 13;
		hash = hash + toupper (name[i]);
		hash = hash & 0x7ff;
	}
	hash = hash % ((FS_FLOPPY_BLOCKSIZE / 4) - 56);
	return hash;
}

static void disk_date (uae_u8 *p)
{
	static int pdays, pmins, pticks;
	int days, mins, ticks;
	struct timeval tv;
	struct mytimeval mtv;

	gettimeofday (&tv, NULL);
	tv.tv_sec -= _timezone;
	mtv.tv_sec = tv.tv_sec;
	mtv.tv_usec = tv.tv_usec;
	timeval_to_amiga (&mtv, &days, &mins, &ticks, 50);
	if (days == pdays && mins == pmins && ticks == pticks) {
		ticks++;
		if (ticks >= 50 * 60) {
			ticks = 0;
			mins++;
			if (mins >= 24 * 60)
				days++;
		}
	}
	pdays = days;
	pmins = mins;
	pticks = ticks;
	p[0] = days >> 24; p[1] = days >> 16; p[2] = days >> 8; p[3] = days >> 0;
	p[4] = mins >> 24; p[5] = mins >> 16; p[6] = mins >> 8; p[7] = mins >> 0;
	p[8] = ticks >> 24; p[9] = ticks >> 16; p[10] = ticks >> 8; p[11] = ticks >> 0;
}

static void createbootblock (uae_u8 *sector, int bootable, bool ffs)
{
	memset (sector, 0, FS_FLOPPY_BLOCKSIZE);
	memcpy (sector, "DOS", 3);
	if (ffs) {
		sector[3] = 1;
	}
	if (bootable) {
		memcpy(sector + 8, bootblock_ofs + 8, sizeof(bootblock_ofs) - 8);
		uae_u32 crc = 0;
		for (int i = 0; i < FS_FLOPPY_BLOCKSIZE; i += 4) {
			uae_u32 v = (sector[i] << 24) | (sector[i + 1] << 16) | (sector[i + 2] << 8) | sector[i + 3];
			if (crc + v < crc) {
				crc++;
			}
			crc += v;
		}
		crc ^= 0xffffffff;
		sector[4] = crc >> 24;
		sector[5] = crc >> 16;
		sector[6] = crc >> 8;
		sector[7] = crc >> 0;
	}
}

static void createrootblock (uae_u8 *sector, const TCHAR *disk_name)
{
	char *dn = ua (disk_name);
	if (strlen (dn) >= 30)
		dn[30] = 0;
	const char *dn2 = dn;
	if (dn2[0] == 0)
		dn2 = "empty";
	memset (sector, 0, FS_FLOPPY_BLOCKSIZE);
	sector[0+3] = 2;
	sector[12+3] = 0x48;
	sector[312] = sector[313] = sector[314] = sector[315] = (uae_u8)0xff;
	sector[316+2] = 881 >> 8; sector[316+3] = 881 & 255;
	sector[432] = (uae_u8)strlen (dn2);
	strcpy ((char*)sector + 433, dn2);
	sector[508 + 3] = 1;
	disk_date (sector + 420);
	memcpy (sector + 472, sector + 420, 3 * 4);
	memcpy (sector + 484, sector + 420, 3 * 4);
	xfree (dn);
}

static int getblock (uae_u8 *bitmap, int *prev)
{
	int i = *prev;
	while (bitmap[i] != 0xff) {
		if (bitmap[i] == 0) {
			bitmap[i] = 1;
			*prev = i;
			return i;
		}
		i++;
	}
	i = 0;
	while (bitmap[i] != 0xff) {
		if (bitmap[i] == 0) {
			bitmap[i] = 1;
			*prev = i;
			return i;
		}
		i++;
	}
	return -1;
}

static void pl (uae_u8 *sector, int offset, uae_u32 v)
{
	sector[offset + 0] = v >> 24;
	sector[offset + 1] = v >> 16;
	sector[offset + 2] = v >> 8;
	sector[offset + 3] = v >> 0;
}

static int createdirheaderblock (uae_u8 *sector, int parent, const char *filename, uae_u8 *bitmap, int *prevblock)
{
	int block = getblock (bitmap, prevblock);

	memset (sector, 0, FS_FLOPPY_BLOCKSIZE);
	pl (sector, 0, 2);
	pl (sector, 4, block);
	disk_date (sector + 512 - 92);
	sector[512 - 80] = (uae_u8)strlen (filename);
	strcpy ((char*)sector + 512 - 79, filename);
	pl (sector, 512 - 12, parent);
	pl (sector, 512 - 4, 2);
	return block;
}

static int createfileheaderblock (struct zfile *z,uae_u8 *sector, int parent, const char *filename, struct zfile *src, uae_u8 *bitmap, bool ffs, int *prevblock)
{
	uae_u8 sector2[FS_FLOPPY_BLOCKSIZE];
	uae_u8 sector3[FS_FLOPPY_BLOCKSIZE];
	int block = getblock (bitmap, prevblock);
	int datablock = getblock (bitmap, prevblock);
	int datasec = 1;
	int extensions;
	int extensionblock, extensioncounter, headerextension = 1;
	int size;
	int blocksize = ffs ? FS_FLOPPY_BLOCKSIZE : FS_OFS_DATABLOCKSIZE;

	zfile_fseek (src, 0, SEEK_END);
	size = (int)zfile_ftell (src);
	zfile_fseek (src, 0, SEEK_SET);
	extensions = (size + blocksize - 1) / blocksize;

	memset (sector, 0, FS_FLOPPY_BLOCKSIZE);
	pl (sector, 0, 2);
	pl (sector, 4, block);
	pl (sector, 8, extensions > FS_EXTENSION_BLOCKS ? FS_EXTENSION_BLOCKS : extensions);
	pl (sector, 16, datablock);
	pl (sector, FS_FLOPPY_BLOCKSIZE - 188, size);
	disk_date (sector + FS_FLOPPY_BLOCKSIZE - 92);
	sector[FS_FLOPPY_BLOCKSIZE - 80] = (uae_u8)strlen (filename);
	strcpy ((char*)sector + FS_FLOPPY_BLOCKSIZE - 79, filename);
	pl (sector, FS_FLOPPY_BLOCKSIZE - 12, parent);
	pl (sector, FS_FLOPPY_BLOCKSIZE - 4, -3);
	extensioncounter = 0;
	extensionblock = 0;

	while (size > 0) {
		int datablock2 = datablock;
		int extensionblock2 = extensionblock;
		if (extensioncounter == FS_EXTENSION_BLOCKS) {
			extensioncounter = 0;
			extensionblock = getblock (bitmap, prevblock);
			if (datasec > FS_EXTENSION_BLOCKS + 1) {
				pl (sector3, 8, FS_EXTENSION_BLOCKS);
				pl (sector3, FS_FLOPPY_BLOCKSIZE - 8, extensionblock);
				pl (sector3, 4, extensionblock2);
				disk_checksum(sector3, sector3 + 20);
				writeimageblock (z, sector3, extensionblock2 * FS_FLOPPY_BLOCKSIZE);
			} else {
				pl (sector, 512 - 8, extensionblock);
			}
			memset (sector3, 0, FS_FLOPPY_BLOCKSIZE);
			pl (sector3, 0, 16);
			pl (sector3, FS_FLOPPY_BLOCKSIZE - 12, block);
			pl (sector3, FS_FLOPPY_BLOCKSIZE - 4, -3);
		}
		memset (sector2, 0, FS_FLOPPY_BLOCKSIZE);
		if (!ffs) {
			pl(sector2, 0, 8);
			pl(sector2, 4, block);
			pl(sector2, 8, datasec);
			pl(sector2, 12, size > FS_OFS_DATABLOCKSIZE ? FS_OFS_DATABLOCKSIZE : size);
			zfile_fread(sector2 + 24, size > FS_OFS_DATABLOCKSIZE ? FS_OFS_DATABLOCKSIZE : size, 1, src);
		} else {
			zfile_fread(sector2, size > FS_FLOPPY_BLOCKSIZE ? FS_FLOPPY_BLOCKSIZE : size, 1, src);
		}
		datasec++;
		size -= blocksize;
		datablock = 0;
		if (size > 0) {
			datablock = getblock(bitmap, prevblock);
		}
		if (!ffs) {
			pl(sector2, 16, datablock);
			disk_checksum(sector2, sector2 + 20);
		}
		writeimageblock (z, sector2, datablock2 * FS_FLOPPY_BLOCKSIZE);
		if (datasec <= FS_EXTENSION_BLOCKS + 1)
			pl (sector, 512 - 204 - extensioncounter * 4, datablock2);
		else
			pl (sector3, 512 - 204 - extensioncounter * 4, datablock2);
		extensioncounter++;
	}
	if (datasec > FS_EXTENSION_BLOCKS) {
		pl (sector3, 8, extensioncounter);
		disk_checksum(sector3, sector3 + 20);
		writeimageblock (z, sector3, extensionblock * FS_FLOPPY_BLOCKSIZE);
	}
	disk_checksum(sector, sector + 20);
	writeimageblock (z, sector, block * FS_FLOPPY_BLOCKSIZE);
	return block;
}

static void createbitmapblock (uae_u8 *sector, uae_u8 *bitmap)
{
	int i, j;
	memset (sector, 0, FS_FLOPPY_BLOCKSIZE);
	i = 0;
	for (;;) {
		uae_u32 mask = 0;
		for (j = 0; j < 32; j++) {
			if (bitmap[2 + i * 32 + j] == 0xff)
				break;
			if (!bitmap[2 + i * 32 + j])
				mask |= 1 << j;
		}
		sector[4 + i * 4 + 0] = mask >> 24;
		sector[4 + i * 4 + 1] = mask >> 16;
		sector[4 + i * 4 + 2] = mask >>  8;
		sector[4 + i * 4 + 3] = mask >>  0;
		if (bitmap[2 + i * 32 + j] == 0xff)
			break;
		i++;

	}
	disk_checksum(sector, sector + 0);
}

static int createimagefromexe(struct zfile *src, struct zfile *dst, int hd, bool ffs)
{
	uae_u8 sector1[FS_FLOPPY_BLOCKSIZE], sector2[FS_FLOPPY_BLOCKSIZE];
	uae_u8 bitmap[FS_FLOPPY_TOTALBLOCKS * 2 + 8];
	int exesize;
	int blocksize = ffs ? FS_FLOPPY_BLOCKSIZE : FS_OFS_DATABLOCKSIZE;
	int blocks, extensionblocks;
	int totalblocks;
	int fblock1, dblock1;
	const char *fname1 = "runme.exe";
	const TCHAR *fname1b = _T("runme.adf");
	const char *fname2 = "startup-sequence";
	const char *dirname1 = "s";
	struct zfile *ss;
	int prevblock;

	memset (bitmap, 0, sizeof bitmap);
	zfile_fseek (src, 0, SEEK_END);
	exesize = (int)zfile_ftell (src);
	blocks = (exesize + blocksize - 1) / blocksize;
	extensionblocks = (blocks + FS_EXTENSION_BLOCKS - 1) / FS_EXTENSION_BLOCKS;
	/* bootblock=2, root=1, bitmap=1, startup-sequence=1+1, exefileheader=1 */
	totalblocks = 2 + 1 + 1 + 2 + 1 + blocks + extensionblocks;
	if (totalblocks > FS_FLOPPY_TOTALBLOCKS * hd)
		return 0;

	bitmap[880 * hd + 0] = 1;
	bitmap[880 * hd + 1] = 1;
	bitmap[0] = 1;
	bitmap[1] = 1;
	bitmap[1760 * hd] = -1;
	prevblock = 880 * hd;

	dblock1 = createdirheaderblock (sector2, 880 * hd, dirname1, bitmap, &prevblock);
	ss = zfile_fopen_empty (src, fname1b, strlen (fname1));
	zfile_fwrite (fname1, strlen(fname1), 1, ss);
	fblock1 = createfileheaderblock (dst, sector1,  dblock1, fname2, ss, bitmap, ffs, &prevblock);
	zfile_fclose (ss);
	pl (sector2, 24 + dirhash (fname2) * 4, fblock1);
	disk_checksum(sector2, sector2 + 20);
	writeimageblock (dst, sector2, dblock1 * FS_FLOPPY_BLOCKSIZE);

	fblock1 = createfileheaderblock (dst, sector1, 880 * hd, fname1, src, bitmap, ffs, &prevblock);

	createrootblock (sector1, zfile_getfilename (src));
	pl (sector1, 24 + dirhash (fname1) * 4, fblock1);
	pl (sector1, 24 + dirhash (dirname1) * 4, dblock1);
	disk_checksum(sector1, sector1 + 20);
	writeimageblock (dst, sector1, 880 * hd * FS_FLOPPY_BLOCKSIZE);

	createbitmapblock (sector1, bitmap);
	writeimageblock (dst, sector1, (880 * hd + 1) * FS_FLOPPY_BLOCKSIZE);

	createbootblock (sector1, 1, ffs);
	writeimageblock (dst, sector1, 0 * FS_FLOPPY_BLOCKSIZE);

	return 1;
}

#ifdef FLOPPYBRIDGE
static FloppyBridgeAPI *bridges[4];
static int bridge_type[4];
static const FloppyDiskBridge::BridgeDriver *bridge_driver[4];
static FloppyBridgeAPI::BridgeInformation bridgeinfo;
static int bridgeinfoloaded;
static std::vector<FloppyBridgeAPI::DriverInformation> bridgedriverinfo;
static void floppybridge_read_track(drive *drv);
bool floppybridge_available;
std::vector<FloppyBridgeAPI::FloppyBridgeProfileInformation> bridgeprofiles;
static char *floppybridge_config = NULL;

bool DISK_isfloppybridge(struct uae_prefs *p, int num)
{
	return p->floppyslots[num].dfxtype == DRV_FB;
}
#endif

static bool isfloppysound (drive *drv)
{
	return drv->useturbo == 0;
}

static int get_floppy_speed (void)
{
	int m = currprefs.floppy_speed;
	if (m <= 10)
		m = 100;
	m = NORMAL_FLOPPY_SPEED * 100 / m;
	return m;
}

static int get_floppy_speed_from_image(drive *drv)
{
	int l, m;
	
#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		drv->fourms = drv->bridge->getBitSpeed() == 4;
		m = NORMAL_FLOPPY_SPEED;
		if (drv->fourms) {
			m *= 2;
		}
		return m;
	}
#endif
	m = get_floppy_speed();
	l = drv->tracklen;
	drv->fourms = false;
	if (!drv->tracktiming[0]) {
		m = m * l / (2 * 8 * FLOPPY_WRITE_LEN * drv->ddhd);
	}
	// 4us track?
	if (l < (FLOPPY_WRITE_LEN_PAL * 8) * 4 / 6) {
		m *= 2;
		drv->fourms = true;
	}
	if (m <= 0) {
		m = 1;
	}

	return m;
}

static const TCHAR *drive_id_name(drive *drv)
{
	switch(drv->drive_id)
	{
	case DRIVE_ID_35HD : return _T("3.5HD");
	case DRIVE_ID_525SD: return _T("5.25SD");
	case DRIVE_ID_35DD : return _T("3.5DD");
	case DRIVE_ID_NONE : return _T("NONE");
	}
	return _T("UNKNOWN");
}

/* Simulate exact behaviour of an A3000T 3.5 HD disk drive.
* The drive reports to be a 3.5 DD drive whenever there is no
* disk or a 3.5 DD disk is inserted. Only 3.5 HD drive id is reported
* when a real 3.5 HD disk is inserted. -Adil
*/
static void drive_settype_id (drive *drv)
{
	int drvnum = drv - &floppy[0];
	int t = currprefs.floppyslots[drvnum].dfxtype;

#ifdef FLOPPYBRIDGE
	if (drv->bridge)
	{
		if (drv->bridge->isDiskInDrive()) {
			switch (drv->bridge->getDriveTypeID()) {
			case FloppyDiskBridge::DriveTypeID::dti35DD:
				drv->drive_id = DRIVE_ID_35DD;
				break;
			case FloppyDiskBridge::DriveTypeID::dti35HD:
				drv->drive_id = DRIVE_ID_35HD;
				break;
			case FloppyDiskBridge::DriveTypeID::dti5255SD:
				drv->drive_id = DRIVE_ID_525SD;
				break;
			}
		} else {
			drv->drive_id = DRIVE_ID_35DD;
		}
		drv->ddhd = drv->drive_id == DRIVE_ID_35HD ? 2 : 1;
		return;
	}
#endif

	switch (t)
	{
	case DRV_35_HD:
#ifdef FLOPPY_DRIVE_HD
		if (!drv->diskfile || drv->ddhd <= 1)
			drv->drive_id = DRIVE_ID_35DD;
		else
			drv->drive_id = DRIVE_ID_35HD;
#else
		drv->drive_id = DRIVE_ID_35DD;
#endif
		break;
	case DRV_35_DD_ESCOM:
	case DRV_35_DD:
	case DRV_525_DD:
	default:
		drv->drive_id = DRIVE_ID_35DD;
		break;
	case DRV_525_SD:
		drv->drive_id = DRIVE_ID_525SD;
		break;
	case DRV_NONE:
	case DRV_PC_525_ONLY_40:
	case DRV_PC_525_40_80:
	case DRV_PC_35_ONLY_80:
		drv->drive_id = DRIVE_ID_NONE;
		break;
	}
#ifdef DEBUG_DRIVE_ID
	write_log (_T("drive_settype_id: DF%d: set to %s\n"), drv-floppy, drive_id_name(drv));
#endif
}

static void drive_image_free (drive *drv)
{
	switch (drv->filetype)
	{
	case ADF_IPF:
#ifdef CAPS
		caps_unloadimage (drv - floppy);
#endif
		break;
	case ADF_SCP:
#ifdef SCP
		scp_close (drv - floppy);
#endif
		break;
	case ADF_FDI:
#ifdef FDI2RAW
		fdi2raw_header_free (drv->fdi);
		drv->fdi = 0;
#endif
		break;
	}
	drv->filetype = ADF_NONE;
	zfile_fclose(drv->diskfile);
	drv->diskfile = NULL;
	zfile_fclose(drv->writediskfile);
	drv->writediskfile = NULL;
	zfile_fclose(drv->pcdecodedfile);
	drv->pcdecodedfile = NULL;
}

static int drive_insert (drive * drv, struct uae_prefs *p, int dnum, const TCHAR *fname, bool fake, bool writeprotected);

static void reset_drive_gui (int num)
{
	struct gui_info_drive *gid = &gui_data.drives[num];
	gid->drive_disabled = 0;
	gid->df[0] = 0;
	gid->crc32 = 0;
	if (currprefs.floppyslots[num].dfxtype < 0)
		gid->drive_disabled = 1;
}

static void setamax (void)
{
#ifdef AMAX
	amax_enabled = false;
	if (is_device_rom(&currprefs, ROMTYPE_AMAX, 0) > 0) {
		/* Put A-Max as last drive in drive chain */
		int j;
		amax_enabled = true;
		for (j = 0; j < MAX_FLOPPY_DRIVES; j++)
			if (floppy[j].amax)
				return;
		for (j = 0; j < MAX_FLOPPY_DRIVES; j++) {
			if ((1 << j) & disabled) {
				floppy[j].amax = 1;
				write_log (_T("AMAX: drive %d\n"), j);
				return;
			}
		}
	}
#endif
}

static bool ispcbridgedrive(int num)
{
	int type = currprefs.floppyslots[num].dfxtype;
	return type == DRV_PC_525_ONLY_40 || type == DRV_PC_35_ONLY_80 || type == DRV_PC_525_40_80;
}

static bool drive_writeprotected(drive *drv)
{
#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		bool v = drv->bridge->isWriteProtected();
		return v;
	}
#endif
#ifdef CATWEASEL
	if (drv->catweasel)
		return 1;
#endif
	return currprefs.floppy_read_only || drv->wrprot || drv->forcedwrprot || drv->diskfile == NULL;
}

static void reset_drive (int num)
{
	drive *drv = &floppy[num];

	drv->amax = 0;
	drive_image_free (drv);
	drv->motoroff = 1;
	drv->idbit = 0;
	drv->drive_id = 0;
	drv->drive_id_scnt = 0;
	drv->lastdataacesstrack = -1;
	disabled &= ~(1 << num);
	reserved &= ~(1 << num);
	if (currprefs.floppyslots[num].dfxtype < 0 || ispcbridgedrive(num))
		disabled |= 1 << num;
	if (ispcbridgedrive(num))
		reserved |= 1 << num;
	reset_drive_gui (num);
	/* most internal Amiga floppy drives won't enable
	* diskready until motor is running at full speed
	* and next indexsync has been passed
	*/
	drv->indexhackmode = 0;
	if (num == 0 && currprefs.floppyslots[num].dfxtype == 0)
		drv->indexhackmode = 1;
	drv->dskchange_time = 0;
	drv->dskchange = false;
	drv->dskready_down_time = 0;
	drv->dskready_up_time = 0;
	drv->buffered_cyl = -1;
	drv->buffered_side = -1;
	gui_led (num + LED_DF0, 0, -1);
	drive_settype_id (drv);
	_tcscpy (currprefs.floppyslots[num].df, changed_prefs.floppyslots[num].df);
	drv->newname[0] = 0;
	drv->newnamewriteprotected = false;
#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		drv->bridge->resetDrive(drv->cyl);
		drv->indexhackmode = 0;
		drv->num_tracks = drv->bridge->getMaxCylinder() * 2;
		drv->filetype = ADF_FLOPPYBRIDGE;
		drv->tracklen = drv->bridge->maxMFMBitPosition();
		drv->ddhd = drv->bridge->getDriveTypeID() == FloppyDiskBridge::DriveTypeID::dti35HD ? 2 : 1;
	}
#endif
	if (!drive_insert (drv, &currprefs, num, currprefs.floppyslots[num].df, false, false))
		disk_eject (num);
}

/* code for track display */
static void update_drive_gui (int num, bool force)
{
	drive *drv = floppy + num;
	bool writ = dskdmaen == DSKDMA_WRITE && drv->state && !((selected | disabled) & (1 << num));
	struct gui_info_drive *gid = &gui_data.drives[num];

	if (!force && drv->state == gid->drive_motor
		&& drv->cyl == gid->drive_track
		&& side == gui_data.drive_side
		&& drv->crc32 == gid->crc32
		&& writ == gid->drive_writing
		&& drive_writeprotected(drv) == gid->floppy_protected
		&& !_tcscmp (gid->df, currprefs.floppyslots[num].df))
		return;
	_tcscpy (gid->df, currprefs.floppyslots[num].df);
	gid->crc32 = drv->crc32;
	gid->drive_motor = drv->state;
	gid->drive_track = drv->cyl;
	if (reserved & (1 << num))
		gui_data.drive_side = reserved_side;
	else
		gui_data.drive_side = side;
	gid->drive_writing = writ;
	gid->floppy_protected = drive_writeprotected(drv);
	gid->floppy_inserted = gid->df[0] || (drv->bridge && !drv->bridge->hasDiskChanged());
	gui_led (num + LED_DF0, (gid->drive_motor ? 1 : 0) | (gid->drive_writing ? 2 : 0), -1);
}

static void drive_fill_bigbuf (drive * drv,int);

void DISK_get_path_text(struct uae_prefs *p, int n, TCHAR *text)
{
	_tcscpy(text, p->floppyslots[n].df);
#ifdef FLOPPYBRIDGE
	if (DISK_isfloppybridge(p, n) && floppybridge_available) {
		if (!bridgeinfoloaded) {
			FloppyBridgeAPI::getBridgeDriverInformation(false, bridgeinfo);
			bridgeinfoloaded = 1;
		}
		_tcscpy(text, bridgeinfo.about);
		floppybridge_init(p);
		if (bridge_driver[n]) {
			_tcscat(text, _T(", "));
			TCHAR *name = au(bridge_driver[n]->name);
			TCHAR *man = au(bridge_driver[n]->manufacturer);
			_tcscat(text, name);
			_tcscat(text, _T(", "));
			_tcscat(text, man);
			xfree(man);
			xfree(name);
		}
	}
#endif
}

int DISK_validate_filename (struct uae_prefs *p, const TCHAR *fname_in, int num, TCHAR *outfname, int leave_open, bool *wrprot, uae_u32 *crc32, struct zfile **zf)
{
	TCHAR outname[MAX_DPATH];

	if (zf)
		*zf = NULL;
	if (crc32)
		*crc32 = 0;
	if (wrprot)
		*wrprot = p->floppy_read_only ? 1 : 0;
	if (outfname)
		outfname[0] = 0;

#ifdef FLOPPYBRIDGE
	if (DISK_isfloppybridge(p, num)) {
		return 1;
	}
#endif

	cfgfile_resolve_path_out_load(fname_in, outname, MAX_DPATH, PATH_FLOPPY);
	if (outfname)
		_tcscpy(outfname, outname);

	if (leave_open || !zf) {
		struct zfile *f = zfile_fopen (outname, _T("r+b"), ZFD_NORMAL | ZFD_DISKHISTORY);
		if (!f) {
			if (wrprot)
				*wrprot = 1;
			f = zfile_fopen (outname, _T("rb"), ZFD_NORMAL | ZFD_DISKHISTORY);
		}
		if (f && crc32)
			*crc32 = zfile_crc32 (f);
		if (!zf)
			zfile_fclose (f);
		else
			*zf = f;
		return f ? 1 : 0;
	} else {
		if (zfile_exists (outname)) {
			if (wrprot && !p->floppy_read_only)
				*wrprot = 0;
			if (crc32) {
				struct zfile *f = zfile_fopen (outname, _T("rb"), ZFD_NORMAL | ZFD_DISKHISTORY);
				if (f)
					*crc32 = zfile_crc32 (f);
				zfile_fclose (f);
			}
			return 1;
		} else {
			if (wrprot)
				*wrprot = 1;
			return 0;
		}
	}
}

static void updatemfmpos (drive *drv)
{
	if (drv->prevtracklen) {
		drv->mfmpos = drv->mfmpos * (drv->tracklen * 1000 / drv->prevtracklen) / 1000;
		if (drv->mfmpos >= drv->tracklen)
			drv->mfmpos = drv->tracklen - 1;
	}
	drv->mfmpos %= drv->tracklen;
	drv->prevtracklen = drv->tracklen;
}

static void track_reset (drive *drv)
{
	drv->tracklen = FLOPPY_WRITE_LEN * drv->ddhd * 2 * 8;
	drv->revolutions = 1;
	drv->trackspeed = get_floppy_speed ();
	drv->buffered_side = -1;
	drv->skipoffset = -1;
	drv->tracktiming[0] = 0;
	memset (drv->bigmfmbuf, 0xaa, FLOPPY_WRITE_LEN * 2 * drv->ddhd);
	updatemfmpos (drv);
}

static int read_header_ext2 (struct zfile *diskfile, trackid *trackdata, int *num_tracks, int *ddhd)
{
	uae_u8 buffer[2 + 2 + 4 + 4];
	trackid *tid;
	int offs;
	int i;

	zfile_fseek (diskfile, 0, SEEK_SET);
	zfile_fread (buffer, 1, 8, diskfile);
	if (strncmp ((char*)buffer, "UAE-1ADF", 8))
		return 0;
	zfile_fread (buffer, 1, 4, diskfile);
	*num_tracks = buffer[2] * 256 + buffer[3];
	offs = 8 + 2 + 2 + (*num_tracks) * (2 + 2 + 4 + 4);

	for (i = 0; i < (*num_tracks); i++) {
		tid = trackdata + i;
		zfile_fread (buffer, 2 + 2 + 4 + 4, 1, diskfile);
		tid->type = (image_tracktype)buffer[3];
		tid->revolutions = buffer[2] + 1;
		tid->len = buffer[5] * 65536 + buffer[6] * 256 + buffer[7];
		tid->bitlen = buffer[9] * 65536 + buffer[10] * 256 + buffer[11];
		tid->offs = offs;
		if (tid->len > 20000 && ddhd)
			*ddhd = 2;
		tid->track = i;
		offs += tid->len;
	}
	return 1;
}

static void saveimagecutpathpart(TCHAR *name)
{
	int i;

	i = _tcslen (name) - 1;
	while (i > 0) {
		if (name[i] == '/' || name[i] == '\\') {
			name[i] = 0;
			break;
		}
		if (name[i] == '.') {
			name[i] = 0;
			break;
		}
		i--;
	}
	while (i > 0) {
		if (name[i] == '/' || name[i] == '\\') {
			name[i] = 0;
			break;
		}
		i--;
	}
}

static void saveimagecutfilepart(TCHAR *name)
{
	TCHAR tmp[MAX_DPATH];
	int i;

	_tcscpy(tmp, name);
	i = _tcslen (tmp) - 1;
	while (i > 0) {
		if (tmp[i] == '/' || tmp[i] == '\\') {
			_tcscpy(name, tmp + i + 1);
			break;
		}
		if (tmp[i] == '.') {
			tmp[i] = 0;
			break;
		}
		i--;
	}
	while (i > 0) {
		if (tmp[i] == '/' || tmp[i] == '\\') {
			_tcscpy(name, tmp + i + 1);
			break;
		}
		i--;
	}
}

static void saveimageaddfilename(TCHAR *dst, const TCHAR *src, int type)
{
	_tcscat(dst, src);
	if (type)
		_tcscat(dst, _T(".save_adf"));
	else
		_tcscat(dst, _T("_save.adf"));
}

static TCHAR *DISK_get_default_saveimagepath (const TCHAR *name)
{
	TCHAR name1[MAX_DPATH];
	TCHAR path[MAX_DPATH];
	_tcscpy(name1, name);
	saveimagecutfilepart(name1);
	fetch_saveimagepath (path, sizeof path / sizeof (TCHAR), 1);
	saveimageaddfilename(path, name1, 0);
	return my_strdup(path);
}

// -2 = existing, if not, use 0.
// -1 = as configured
// 0 = saveimages-dir
// 1 = image dir
TCHAR *DISK_get_saveimagepath(const TCHAR *name, int type)
{
	int typev = type;

	for (int i = 0; i < 2; i++) {
		if (typev == 1 || (typev == -1 && saveimageoriginalpath) || (typev == -2 && (saveimageoriginalpath || i == 1))) {
			TCHAR si_name[MAX_DPATH], si_path[MAX_DPATH];
			_tcscpy(si_name, name);
			_tcscpy(si_path, name);
			saveimagecutfilepart(si_name);
			saveimagecutpathpart(si_path);
			_tcscat(si_path, FSDB_DIR_SEPARATOR_S);
			saveimageaddfilename(si_path, si_name, 1);
			if (typev != -2 || (typev == -2 && zfile_exists(si_path)))
				return my_strdup(si_path);
		}
		if (typev == 2 || (typev == -1 && !saveimageoriginalpath) || (typev == -2 && (!saveimageoriginalpath || i == 1))) {
			TCHAR *p = DISK_get_default_saveimagepath(name);
			if (typev != -2 || (typev == -2 && zfile_exists(p)))
				return p;
			xfree(p);
		}
	}
	return DISK_get_saveimagepath(name, -1);
}

static struct zfile *getexistingwritefile(struct uae_prefs *p, const TCHAR *name, int num, bool *wrprot)
{
	struct zfile *zf = NULL;
	TCHAR *path;
	TCHAR outname[MAX_DPATH];

	path = DISK_get_saveimagepath(name, saveimageoriginalpath);
	DISK_validate_filename(p, path, num, outname, 1, wrprot, NULL, &zf);
	xfree(path);
	if (zf)
		return zf;
	path = DISK_get_saveimagepath(name, !saveimageoriginalpath);
	DISK_validate_filename(p, path, num, outname, 1, wrprot, NULL, &zf);
	xfree(path);
	return zf;
}

static int iswritefileempty(struct uae_prefs *p, int num, const TCHAR *name)
{
	struct zfile *zf;
	bool wrprot;
	uae_char buffer[8];
	trackid td[MAX_TRACKS];
	int tracks, ddhd, i, ret;

	zf = getexistingwritefile(p, name, num, &wrprot);
	if (!zf)
		return 1;
	zfile_fread (buffer, sizeof (char), 8, zf);
	if (strncmp((uae_char*)buffer, "UAE-1ADF", 8)) {
		zfile_fclose(zf);
		return 0;
	}
	ret = read_header_ext2 (zf, td, &tracks, &ddhd);
	zfile_fclose (zf);
	if (!ret)
		return 1;
	for (i = 0; i < tracks; i++) {
		if (td[i].bitlen)
			return 0;
	}
	return 1;
}

static int openwritefile (struct uae_prefs *p, drive *drv, int create)
{
	bool wrprot = 0;

	drv->writediskfile = getexistingwritefile(p, currprefs.floppyslots[drv - &floppy[0]].df, drv - &floppy[0], &wrprot);
	if (drv->writediskfile) {
		drv->wrprot = wrprot;
		if (!read_header_ext2 (drv->writediskfile, drv->writetrackdata, &drv->write_num_tracks, 0)) {
			zfile_fclose (drv->writediskfile);
			drv->writediskfile = 0;
			drv->wrprot = 1;
		} else {
			if (drv->write_num_tracks > drv->num_tracks)
				drv->num_tracks = drv->write_num_tracks;
		}
	} else if (zfile_iscompressed (drv->diskfile)) {
		drv->wrprot = 1;
	}
	return drv->writediskfile ? 1 : 0;
}

static bool diskfile_iswriteprotect (struct uae_prefs *p, const TCHAR *fname_in, int num, int *needwritefile, drive_type *drvtype)
{
	struct zfile *zf1, *zf2;
	bool wrprot1 = 0, wrprot2 = 1;
	uae_char buffer[25];
	TCHAR outname[MAX_DPATH];

	*needwritefile = 0;
	*drvtype = DRV_35_DD;
	DISK_validate_filename (p, fname_in, num, outname, 1, &wrprot1, NULL, &zf1);
	if (!zf1)
		return 1;
	if (zfile_iscompressed (zf1)) {
		wrprot1 = 1;
		*needwritefile = 1;
	}
	zf2 = getexistingwritefile(p, fname_in, num, &wrprot2);
	zfile_fclose (zf2);
	zfile_fread (buffer, sizeof (char), 25, zf1);
	zfile_fclose (zf1);
	if (strncmp ((uae_char*) buffer, "CAPS", 4) == 0) {
		*needwritefile = 1;
		return wrprot2;
	}
	if (strncmp ((uae_char*) buffer, "SCP", 3) == 0) {
		*needwritefile = 1;
		return wrprot2;
	}
	if (strncmp ((uae_char*) buffer, "Formatted Disk Image file", 25) == 0) {
		*needwritefile = 1;
		return wrprot2;
	}
	if (strncmp ((uae_char*) buffer, "UAE-1ADF", 8) == 0) {
		if (wrprot1)
			return wrprot2;
		return wrprot1;
	}
	if (strncmp ((uae_char*) buffer, "UAE--ADF", 8) == 0) {
		*needwritefile = 1;
		return wrprot2;
	}
	if (memcmp (exeheader, buffer, sizeof exeheader) == 0)
		return 0;
	if (wrprot1)
		return wrprot2;
	return wrprot1;
}

static bool isrecognizedext(const TCHAR *name)
{
	const TCHAR *ext = _tcsrchr(name, '.');
	if (ext) {
		ext++;
		if (!_tcsicmp(ext, _T("adf")) || !_tcsicmp(ext, _T("adz")) || !_tcsicmp(ext, _T("st")) ||
			!_tcsicmp(ext, _T("ima")) || !_tcsicmp(ext, _T("img")) || !_tcsicmp(ext, _T("dsk")))
			return true;
	}
	return false;
}

static void update_disk_statusline(int num)
{
	drive *drv = &floppy[num];
#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		const char *name = drv->bridge->getDriverInfo()->name;
		TCHAR *n = au(name);
		statusline_add_message(STATUSTYPE_FLOPPY, _T("DF%d: %s"), num, n);
		xfree(n);
		return;
	}
#endif
	if (!drv->diskfile)
		return;
	const TCHAR *fname = zfile_getoriginalname(drv->diskfile);
	if (!fname)
		fname = zfile_getname(drv->diskfile);
	if (!fname)
		fname = _T("?");
	if (disk_info_data.diskname[0])
		statusline_add_message(STATUSTYPE_FLOPPY, _T("DF%d: [%s] %s"), num, disk_info_data.diskname, my_getfilepart(fname));
	else
		statusline_add_message(STATUSTYPE_FLOPPY, _T("DF%d: %s"), num, my_getfilepart(fname));
}

static int drive_insert (drive *drv, struct uae_prefs *p, int dnum, const TCHAR *fname_in, bool fake, bool forcedwriteprotect)
{
	uae_u8 buffer[2 + 2 + 4 + 4];
	trackid *tid;
	int num_tracks, size;
	int canauto;
	TCHAR outname[MAX_DPATH];
	int dfxtype = p->floppyslots[dnum].dfxtype;

	drive_image_free (drv);
	if (!fake && !drv->bridge) {
		DISK_examine_image(p, dnum, &disk_info_data, false, NULL);
	}
	DISK_validate_filename (p, fname_in, dnum, outname, 1, &drv->wrprot, &drv->crc32, &drv->diskfile);
	drv->forcedwrprot = forcedwriteprotect;
	if (drv->forcedwrprot)
		drv->wrprot = true;
	drv->ddhd = 1;
	drv->num_heads = 2;
	drv->num_secs = 0;
	drv->hard_num_cyls = dfxtype == DRV_525_SD ? 40 : 80;
	drv->tracktiming[0] = 0;
	drv->useturbo = 0;
	drv->indexoffset = 0;
	if (!fake) {
		drv->dskeject = false;
		gui_disk_image_change (dnum, outname, drv->wrprot);
	}

	if (!drv->motoroff) {
		drv->dskready_up_time = DSKREADY_UP_TIME * 312 + (uaerand() & 511);
		drv->dskready_down_time = 0;
	}

	if (drv->diskfile == NULL && !drv->catweasel && !drv->bridge) {
		track_reset (drv);
		return 0;
	}

	if (!fake) {
		inprec_recorddiskchange (dnum, fname_in, drv->wrprot);

		if (currprefs.floppyslots[dnum].df != fname_in) {
			_tcsncpy (currprefs.floppyslots[dnum].df, fname_in, 255);
			currprefs.floppyslots[dnum].df[255] = 0;
		}
		currprefs.floppyslots[dnum].forcedwriteprotect = forcedwriteprotect;
		_tcsncpy (changed_prefs.floppyslots[dnum].df, fname_in, 255);
		changed_prefs.floppyslots[dnum].df[255] = 0;
		changed_prefs.floppyslots[dnum].forcedwriteprotect = forcedwriteprotect;
		_tcscpy (drv->newname, fname_in);
		drv->newnamewriteprotected = forcedwriteprotect;
		gui_filename (dnum, outname);
	}

	memset (buffer, 0, sizeof buffer);
	size = 0;
	if (drv->diskfile) {
		zfile_fread (buffer, sizeof (char), 8, drv->diskfile);
		zfile_fseek (drv->diskfile, 0, SEEK_END);
		size = (int)zfile_ftell (drv->diskfile);
		zfile_fseek (drv->diskfile, 0, SEEK_SET);
	}

	canauto = 0;
	if (isrecognizedext (outname))
		canauto = 1;
	if (!canauto && drv->diskfile && isrecognizedext (zfile_getname (drv->diskfile)))
		canauto = 1;
	// if PC-only drive, make sure PC-like floppies are always detected
	if (!canauto && ispcbridgedrive(dnum))
		canauto = 1;

	if (drv->catweasel) {

		drv->wrprot = true;
		drv->filetype = ADF_CATWEASEL;
		drv->num_tracks = 80;
		drv->ddhd = 1;

#ifdef FLOPPYBRIDGE
	} else if (drv->bridge) {
		drv->ddhd = (drv->bridge->getDriveTypeID() == FloppyDiskBridge::DriveTypeID::dti35HD) ? 2 : 1;
		drv->num_heads = 2;
		drv->num_secs = 0;
		drv->hard_num_cyls = drv->bridge->getMaxCylinder();
		drv->num_tracks = drv->bridge->getMaxCylinder() * 2;
		drv->tracklen = drv->bridge->maxMFMBitPosition();
		drv->tracktiming[0] = drv->bridge->getMFMSpeed(0);
		drv->multi_revolution = 1;
		drv->fourms = (drv->bridge->getBitSpeed() == 4);
		drv->indexoffset = 0;
		drv->prevtracklen = 0;
		drv->forcedwrprot = false;
		drv->wrprot = drv->bridge->isWriteProtected();
		drv->filetype = ADF_FLOPPYBRIDGE;
		drv->useturbo = 0;
		drv->mfmpos = uaerand();
		drv->mfmpos |= (uaerand() << 16);
		drv->mfmpos %= drv->tracklen;
		drv->prevtracklen = 0;

		drive_settype_id(drv); /* Set DD or HD drive */
		update_drive_gui(drv - floppy, false);
		update_disk_statusline(drv - floppy);
		drive_fill_bigbuf(drv, fake ? -1 : 1);

		return 1;
#endif
#ifdef CAPS
	} else if (strncmp ((char*)buffer, "CAPS", 4) == 0) {

		drv->wrprot = true;
		if (!caps_loadimage (drv->diskfile, drv - floppy, &num_tracks)) {
			zfile_fclose (drv->diskfile);
			drv->diskfile = 0;
			return 0;
		}
		drv->num_tracks = num_tracks;
		drv->filetype = ADF_IPF;
#endif
#ifdef SCP
	} else if (strncmp ((char*)buffer, "SCP", 3) == 0) {
		drv->wrprot = true;
		if (!scp_open (drv->diskfile, drv - floppy, &num_tracks)) {
			zfile_fclose (drv->diskfile);
			drv->diskfile = 0;
			return 0;
		}
		drv->num_tracks = num_tracks;
		drv->filetype = ADF_SCP;
#endif
#ifdef FDI2RAW
	} else if ((drv->fdi = fdi2raw_header (drv->diskfile))) {

		drv->wrprot = true;
		drv->num_tracks = fdi2raw_get_last_track (drv->fdi);
		drv->num_secs = fdi2raw_get_num_sector (drv->fdi);
		drv->filetype = ADF_FDI;
#endif
	} else if (strncmp ((char*)buffer, "UAE-1ADF", 8) == 0) {

		read_header_ext2 (drv->diskfile, drv->trackdata, &drv->num_tracks, &drv->ddhd);
		drv->filetype = ADF_EXT2;
		drv->num_secs = 11;
		if (drv->ddhd > 1)
			drv->num_secs = 22;

	} else if (strncmp ((char*)buffer, "UAE--ADF", 8) == 0) {
		int offs = 160 * 4 + 8;

		drv->wrprot = true;
		drv->filetype = ADF_EXT1;
		drv->num_tracks = 160;
		drv->num_secs = 11;

		zfile_fseek (drv->diskfile, 8, SEEK_SET);
		for (int i = 0; i < 160; i++) {
			tid = &drv->trackdata[i];
			zfile_fread (buffer, 4, 1, drv->diskfile);
			tid->sync = buffer[0] * 256 + buffer[1];
			tid->len = buffer[2] * 256 + buffer[3];
			tid->offs = offs;
			tid->revolutions = 1;
			if (tid->sync == 0) {
				tid->type = TRACK_AMIGADOS;
				tid->bitlen = 0;
			} else {
				tid->type = TRACK_RAW1;
				tid->bitlen = tid->len * 8;
			}
			offs += tid->len;
		}

	} else if (memcmp (exeheader, buffer, sizeof exeheader) == 0 && !canauto && size <= 512 * (1760 * 2 - 7)) {
		bool ffs = false;
		int hd = 1;
		int freeblocks = 1760 - 7;
		int blocks_ofs = (size + FS_OFS_DATABLOCKSIZE - 1) / FS_OFS_DATABLOCKSIZE;
		int extensionblocks_ofs = (blocks_ofs + FS_EXTENSION_BLOCKS - 1) / FS_EXTENSION_BLOCKS;
		int blocks_ffs = (size + FS_FLOPPY_BLOCKSIZE - 1) / FS_FLOPPY_BLOCKSIZE;
		int extensionblocks_ffs = (blocks_ffs + FS_EXTENSION_BLOCKS - 1) / FS_EXTENSION_BLOCKS;
		// select DD+FFS if file larger than DD+OFS
		if (size > FS_OFS_DATABLOCKSIZE * (freeblocks - extensionblocks_ofs)) {
			ffs = true;
			// select HD+FFS if file larger than DD+FFS
			if (size > FS_FLOPPY_BLOCKSIZE * (freeblocks - extensionblocks_ffs)) {
				hd = 2;
			}
		}
		if (dfxtype == DRV_35_DD) {
			hd = 1;
		}
		if (size <= 512 * (1760 * hd - 7)) {
			struct zfile *z = zfile_fopen_empty(NULL, _T(""), 512 * 1760 * hd);
			createimagefromexe(drv->diskfile, z, hd, ffs);
			drv->filetype = ADF_NORMAL;
			zfile_fclose(drv->diskfile);
			drv->diskfile = z;
			drv->num_tracks = 160;
			drv->num_secs = 11 * hd;
			for (int i = 0; i < drv->num_tracks; i++) {
				tid = &drv->trackdata[i];
				tid->type = TRACK_AMIGADOS;
				tid->len = 512 * drv->num_secs;
				tid->bitlen = 0;
				tid->offs = i * 512 * drv->num_secs;
				tid->revolutions = 1;
			}
			drv->ddhd = hd;
			drv->useturbo = 1;
		}

	} else if (canauto && (

		// 320k double sided
		size == 8 * 40 * 2 * 512 ||
		// 320k single sided
		size == 8 * 40 * 1 * 512 ||

		// 360k double sided
		size == 9 * 40 * 2 * 512 ||
		// 360k single sided
		size == 9 * 40 * 1 * 512 ||

		// 1.2M double sided
		size == 15 * 80 * 2 * 512 ||

		// 720k/1440k double sided
		size == 9 * 80 * 2 * 512 || size == 18 * 80 * 2 * 512 || size == 10 * 80 * 2 * 512 || size == 20 * 80 * 2 * 512 || size == 21 * 80 * 2 * 512 ||
		size == 9 * 81 * 2 * 512 || size == 18 * 81 * 2 * 512 || size == 10 * 81 * 2 * 512 || size == 20 * 81 * 2 * 512 || size == 21 * 81 * 2 * 512 ||
		size == 9 * 82 * 2 * 512 || size == 18 * 82 * 2 * 512 || size == 10 * 82 * 2 * 512 || size == 20 * 82 * 2 * 512 || size == 21 * 82 * 2 * 512 ||
		// 720k/1440k single sided
		size == 9 * 80 * 1 * 512 || size == 18 * 80 * 1 * 512 || size == 10 * 80 * 1 * 512 || size == 20 * 80 * 1 * 512 ||
		size == 9 * 81 * 1 * 512 || size == 18 * 81 * 1 * 512 || size == 10 * 81 * 1 * 512 || size == 20 * 81 * 1 * 512 ||
		size == 9 * 82 * 1 * 512 || size == 18 * 82 * 1 * 512 || size == 10 * 82 * 1 * 512 || size == 20 * 82 * 1 * 512)) {
			/* PC formatted image */
			int side, sd;

			drv->num_secs = 9;
			drv->ddhd = 1;
			sd = 0;

			bool can40 = dfxtype == DRV_525_DD || dfxtype == DRV_PC_525_ONLY_40 || dfxtype == DRV_PC_525_40_80;
			bool can80 = dfxtype == DRV_35_HD || dfxtype == DRV_PC_35_ONLY_80 || dfxtype == DRV_PC_525_40_80;
			bool drv525 = dfxtype == DRV_525_DD || dfxtype == DRV_PC_525_ONLY_40 || dfxtype == DRV_PC_525_40_80;
	
			for (side = 2; side > 0; side--) {
				if (drv->hard_num_cyls >= 80 && can80) {
					if (       size ==  9 * 80 * side * 512 || size ==  9 * 81 * side * 512 || size ==  9 * 82 * side * 512) {
						drv->num_secs = 9;
						drv->ddhd = 1;
						break;
					} else if (!drv525 && (size == 18 * 80 * side * 512 || size == 18 * 81 * side * 512 || size == 18 * 82 * side * 512)) {
						drv->num_secs = 18;
						drv->ddhd = 2;
						break;
					} else if (!drv525 && (size == 10 * 80 * side * 512 || size == 10 * 81 * side * 512 || size == 10 * 82 * side * 512)) {
						drv->num_secs = 10;
						drv->ddhd = 1;
						break;
					} else if (!drv525 && (size == 20 * 80 * side * 512 || size == 20 * 81 * side * 512 || size == 20 * 82 * side * 512)) {
						drv->num_secs = 20;
						drv->ddhd = 2;
						break;
					} else if (!drv525 && (size == 21 * 80 * side * 512 || size == 21 * 81 * side * 512 || size == 21 * 82 * side * 512)) {
						drv->num_secs = 21;
						drv->ddhd = 2;
						break;
					} else if (size == 15 * 80 * side * 512) {
						drv->num_secs = 15;
						drv->ddhd = 1;
						break;
					}
				}
				if (drv->hard_num_cyls == 40 || can40) {
					if (size == 9 * 40 * side * 512) {
						drv->num_secs = 9;
						drv->ddhd = 1;
						sd = 1;
						break;
					} else if (size == 8 * 40 * side * 512) {
						drv->num_secs = 8;
						drv->ddhd = 1;
						sd = 1;
						break;
					}
				}
			}

			drv->num_tracks = size / (drv->num_secs * 512);

			// SD disk in 5.25 drive = duplicate each track
			if (sd && dfxtype == DRV_525_DD) {
				drv->num_tracks *= 2;
			} else {
				sd = 0;
			}

			drv->filetype = ADF_PCDOS;
			tid = &drv->trackdata[0];
			for (int i = 0; i < drv->num_tracks; i++) {
				tid->type = TRACK_PCDOS;
				tid->len = 512 * drv->num_secs;
				tid->bitlen = 0;
				tid->offs = (sd ? i / 2 : i) * 512 * drv->num_secs;
				if (side == 1) {
					tid++;
					tid->type = TRACK_NONE;
					tid->len = 512 * drv->num_secs;
				}
				tid->revolutions = 1;
				tid++;

			}
			drv->num_heads = side;
			if (side == 1)
				drv->num_tracks *= 2;

	} else if ((size == 262144 || size == 524288) && buffer[0] == 0x11 && (buffer[1] == 0x11 || buffer[1] == 0x14)) {

		// 256k -> KICK disk, 512k -> SuperKickstart disk
		drv->filetype = size == 262144 ? ADF_KICK : ADF_SKICK;
		drv->num_tracks = 1760 / (drv->num_secs = 11);
		for (int i = 0; i < drv->num_tracks; i++) {
			tid = &drv->trackdata[i];
			tid->type = TRACK_AMIGADOS;
			tid->len = 512 * drv->num_secs;
			tid->bitlen = 0;
			tid->offs = i * 512 * drv->num_secs - (drv->filetype == ADF_KICK ? 512 : 262144 + 1024);
			tid->track = i;
			tid->revolutions = 1;
		}

	} else {

		int ds;

		ds = 0;
		drv->filetype = ADF_NORMAL;

		/* High-density, diskspare disk or sector headers included? */
		drv->num_tracks = 0;
		if (size > 160 * 11 * 512 + 511) { // larger than standard adf?
			for (int i = 80; i <= 83; i++) {
				if (size == i * 22 * 512 * 2) { // HD
					drv->ddhd = 2;
					drv->num_tracks = size / (512 * (drv->num_secs = 22));
					break;
				}
				if (size == i * 11 * 512 * 2) { // >80 cyl DD
					drv->num_tracks = size / (512 * (drv->num_secs = 11));
					break;
				}
				if (size == i * 12 * 512 * 2) { // ds 12 sectors
					drv->num_tracks = size / (512 * (drv->num_secs = 12));
					ds = 1;
					break;
				}
				if (size == i * 24 * 512 * 2) { // ds 24 sectors
					drv->num_tracks = size / (512 * (drv->num_secs = 24));
					drv->ddhd = 2;
					ds = 1;
					break;
				}
				if (size == i * 11 * (512 + 16) * 2) { // 80+ cyl DD + headers
					drv->num_tracks = size / ((512 + 16) * (drv->num_secs = 11));
					drv->filetype = ADF_NORMAL_HEADER;
					break;
				}
				if (size == i * 22 * (512 + 16) * 2) { // 80+ cyl HD + headers
					drv->num_tracks = size / ((512 + 16) * (drv->num_secs = 22));
					drv->filetype = ADF_NORMAL_HEADER;
					break;
				}
			}
			if (drv->num_tracks == 0) {
				drv->num_tracks = size / (512 * (drv->num_secs = 22));
				drv->ddhd = 2;
			}
		} else {
			drv->num_tracks = size / (512 * (drv->num_secs = 11));
		}

		if (!ds && drv->num_tracks > MAX_TRACKS)
			write_log (_T("Your diskfile is too big, %d bytes!\n"), size);
		for (int i = 0; i < drv->num_tracks; i++) {
			tid = &drv->trackdata[i];
			tid->type = ds ? TRACK_DISKSPARE : TRACK_AMIGADOS;
			tid->len = 512 * drv->num_secs;
			tid->bitlen = 0;
			tid->offs = i * 512 * drv->num_secs;
			tid->revolutions = 1;
			if (drv->filetype == ADF_NORMAL_HEADER) {
				tid->extraoffs = drv->num_tracks * 512 * drv->num_secs + i * 16 * drv->num_secs;
			} else {
				tid->extraoffs = -1;
			}
		}
	}
	openwritefile (p, drv, 0);
	drive_settype_id (drv); /* Set DD or HD drive */
	drive_fill_bigbuf (drv, 1);
	drv->mfmpos = uaerand ();
	drv->mfmpos |= (uaerand () << 16);
	drv->mfmpos %= drv->tracklen;
	drv->prevtracklen = 0;
	if (!fake) {
#ifdef DRIVESOUND
		if (isfloppysound (drv))
			driveclick_insert (drv - floppy, 0);
#endif
		update_drive_gui (drv - floppy, false);
		update_disk_statusline(drv - floppy);
	}
	return 1;
}

static void rand_shifter (drive *drv)
{
	if (selected & (1 << (drv - floppy)))
		return;

	int r = ((uaerand() >> 4) & 7) + 1;
	while (r-- > 0) {
		word <<= 1;
		word |= (uaerand() & 0x1000) ? 1 : 0;
		bitoffset++;
		bitoffset &= 15;
	}
}

static void set_steplimit (drive *drv)
{
	// emulate step limit only if cycle-exact or approximate CPU speed
	if (currprefs.m68k_speed != 0)
		return;
	drv->steplimit = 4;
	drv->steplimitcycle = get_cycles ();
}

static bool drive_empty (drive * drv)
{
#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		bool v = drv->bridge->isDiskInDrive();
		return v == false;
	}
#endif
#ifdef CATWEASEL
	if (drv->catweasel)
		return catweasel_disk_changed (drv->catweasel) == 0;
#endif
	return drv->diskfile == 0 && drv->dskchange_time >= 0;
}

static void drive_step (drive *drv, int step_direction)
{
#ifdef CATWEASEL
	if (drv->catweasel) {
		int dir = direction ? -1 : 1;
		catweasel_step (drv->catweasel, dir);
		drv->cyl += dir;
		if (drv->cyl < 0)
			drv->cyl = 0;
		write_log (_T("%d -> %d\n"), dir, drv->cyl);
		return;
	}
#endif
	if (!drive_empty (drv))
		drv->dskchange = 0;

#ifdef FLOPPYBRIDGE
	if (drv->bridge) {
		int dir = step_direction ? -1 : 1;
		drv->cyl += dir;
		if (drv->cyl < 0) {
			drv->cyl = 0;
			drv->bridge->handleNoClickStep(side);
		} else {
			if (drv->cyl >= drv->bridge->getMaxCylinder()) {
				drv->cyl = drv->bridge->getMaxCylinder() - 1;
			}
			drv->bridge->gotoCylinder(drv->cyl, side);
		}
		return;
	}
#endif

	if (drv->steplimit && get_cycles() - drv->steplimitcycle < MIN_STEPLIMIT_CYCLE) {
		write_log (_T(" step ignored drive %ld, %lu\n"),
			drv - floppy, (get_cycles() - drv->steplimitcycle) / CYCLE_UNIT);
		return;
	}
	/* A1200's floppy drive needs at least 30 raster lines between steps
	* but we'll use very small value for better compatibility with faster CPU emulation
	* (stupid trackloaders with CPU delay loops)
	*/
	set_steplimit (drv);
	if (step_direction) {
		if (drv->cyl) {
			drv->cyl--;
#ifdef DRIVESOUND
			if (isfloppysound (drv))
				driveclick_click (drv - floppy, drv->cyl);
#endif
		}
		/*	else
		write_log (_T("program tried to step beyond track zero\n"));
		"no-click" programs does that
		*/
	} else {
		int maxtrack = drv->hard_num_cyls;
		if (drv->cyl < maxtrack + 3) {
			drv->cyl++;
#ifdef CATWEASEL
			if (drv->catweasel)
				catweasel_step (drv->catweasel, 1);
#endif
		}
		if (drv->cyl >= maxtrack)
			write_log (_T("program tried to step over track %d PC %08x\n"), maxtrack, M68K_GETPC);
#ifdef DRIVESOUND
		if (isfloppysound (drv))
			driveclick_click (drv - floppy, drv->cyl);
#endif
	}
	rand_shifter (drv);
	if (disk_debug_logging > 2)
		write_log (_T(" ->step %d"), drv->cyl);
}

static bool drive_track0 (drive * drv)
{
#ifdef FLOPPYBRIDG…