/zfile.cpp

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/*
* UAE - The Un*x Amiga Emulator
*
* routines to handle compressed file automatically
*
* (c) 1996 Samuel Devulder, Tim Gunn
*     2002-2007 Toni Wilen
*/

#define RECURSIVE_ARCHIVES 1
//#define ZFILE_DEBUG

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

#include "options.h"
#include "zfile.h"
#include "disk.h"
#include "gui.h"
#include "crc32.h"
#include "fsdb.h"
#include "fsusage.h"
#include "zarchive.h"
#include "diskutil.h"
#include "fdi2raw.h"
#include "uae/io.h"

#include "archivers/zip/unzip.h"
#include "archivers/dms/pfile.h"
#include "archivers/wrp/warp.h"

static struct zfile *zlist = 0;

const TCHAR *uae_archive_extensions[] = { _T("zip"), _T("rar"), _T("7z"), _T("lha"), _T("lzh"), _T("lzx"), _T("tar"), NULL };

#define MAX_CACHE_ENTRIES 10

struct zdisktrack
{
	void *data;
	int len;
};
struct zdiskimage
{
	int tracks;
	struct zdisktrack zdisktracks[2 * 84];
};
struct zcache
{
	TCHAR *name;
	struct zdiskimage *zd;
	void *data;
	int size;
	struct zcache *next;
	time_t tm;
};
static struct zcache *zcachedata;

static struct zcache *cache_get (const TCHAR *name)
{
	struct zcache *zc = zcachedata;
	while (zc) {
		if (!_tcscmp (name, zc->name)) {
			zc->tm = time (NULL);
			return zc;
		}
		zc = zc->next;
	}
	return NULL;
}

static void zcache_flush (void)
{
}

static void zcache_free_data (struct zcache *zc)
{
	int i;
	if (zc->zd) {
		for (i = 0; i < zc->zd->tracks; i++) {
			xfree (zc->zd->zdisktracks[i].data);
		}
		xfree (zc->zd);
	}
	xfree (zc->data);
	xfree (zc->name);
}

static void zcache_free (struct zcache *zc)
{
	struct zcache *pl = NULL;
	struct zcache *l  = zcachedata;
	struct zcache *nxt;

	while (l != zc) {
		if (l == 0)
			return;
		pl = l;
		l = l->next;
	}
	if (l)
		nxt = l->next;
	zcache_free_data (zc);
	if (l == 0)
		return;
	if(!pl)
		zcachedata = nxt;
	else
		pl->next = nxt;
}

static void zcache_close (void)
{
	struct zcache *zc = zcachedata;
	while (zc) {
		struct zcache *n = zc->next;
		zcache_free_data (zc);
		xfree (n);
		zc = n;
	}
}

static void zcache_check (void)
{
	int cnt = 0;
	struct zcache *zc = zcachedata, *last = NULL;
	while (zc) {
		last = zc;
		zc = zc->next;
		cnt++;
	}
	write_log (_T("CACHE: %d\n"), cnt);
	if (cnt >= MAX_CACHE_ENTRIES && last)
		zcache_free (last);
}

static struct zcache *zcache_put (const TCHAR *name, struct zdiskimage *data)
{
	struct zcache *zc;
	
	zcache_check ();
	zc = xcalloc (struct zcache, 1);
	zc->next = zcachedata;
	zcachedata = zc;
	zc->zd = data;
	zc->name = my_strdup (name);
	zc->tm = time (NULL);
	return zc;
}

static void checkarchiveparent (struct zfile *z)
{
	// unpack completely if opened in PEEK mode
	if (z->archiveparent)
		archive_unpackzfile (z);
}

static struct zfile *zfile_create (struct zfile *prev, const TCHAR *originalname)
{
	struct zfile *z;

	z = xmalloc (struct zfile, 1);
	if (!z)
		return 0;
	memset (z, 0, sizeof *z);
	z->next = zlist;
	zlist = z;
	z->opencnt = 1;
	if (prev && prev->originalname)
		z->originalname = my_strdup(prev->originalname);
	else if (originalname)
		z->originalname = my_strdup(originalname);
	if (prev) {
		z->zfdmask = prev->zfdmask;
	}
	return z;
}

static void zfile_free (struct zfile *f)
{
	if (f->f)
		fclose (f->f);
	if (f->deleteafterclose) {
		_wunlink (f->name);
		write_log (_T("deleted temporary file '%s'\n"), f->name);
	}
	xfree (f->name);
	xfree (f->originalname);
	xfree (f->data);
	xfree (f->mode);
	xfree (f->userdata);
	xfree (f);
}

void zfile_exit (void)
{
	struct zfile *l;
	while ((l = zlist)) {
		zlist = l->next;
		zfile_free (l);
	}
}

void zfile_fclose (struct zfile *f)
{
	//write_log (_T("%p\n"), f);
	if (!f)
		return;
	if (f->opencnt < 0) {
		write_log (_T("zfile: tried to free already closed filehandle!\n"));
		return;
	}
	f->opencnt--;
	if (f->opencnt > 0)
		return;
	f->opencnt = -100;
	if (f->parent) {
		f->parent->opencnt--;
		if (f->parent->opencnt <= 0)
			zfile_fclose (f->parent);
	}
	if (f->archiveparent) {
		zfile_fclose (f->archiveparent);
		f->archiveparent = NULL;
	}
	struct zfile *pl = NULL;
	struct zfile *nxt;
	struct zfile *l  = zlist;
	while (l != f) {
		if (l == 0) {
			write_log (_T("zfile: tried to free already freed or nonexisting filehandle!\n"));
			return;
		}
		pl = l;
		l = l->next;
	}
	if (l)
		nxt = l->next;
	zfile_free (f);
	if (l == 0)
		return;
	if(!pl)
		zlist = nxt;
	else
		pl->next = nxt;
}

static void removeext (TCHAR *s, const TCHAR *ext)
{
	if (_tcslen (s) < _tcslen (ext))
		return;
	if (_tcsicmp (s + _tcslen (s) - _tcslen (ext), ext) == 0)
		s[_tcslen (s) - _tcslen (ext)] = 0;
}

static bool checkwrite (struct zfile *zf, int *retcode)
{
	if (zfile_needwrite (zf)) {
		if (retcode)
			*retcode = -1;
		return true;
	}
	return false;
}


static uae_u8 exeheader[]={ 0x00,0x00,0x03,0xf3,0x00,0x00,0x00,0x00 };
static const TCHAR *diskimages[] = { _T("adf"), _T("adz"), _T("ipf"), _T("scp"), _T("fdi"), _T("dms"), _T("wrp"), _T("dsq"), _T("pkd"), _T("ima"), 0 };

int zfile_gettype (struct zfile *z)
{
	uae_u8 buf[8];
	TCHAR *ext;

	if (!z || !z->name)
		return ZFILE_UNKNOWN;
	ext = _tcsrchr (z->name, '.');
	if (ext != NULL) {
		int i;
		ext++;
		for (i = 0; diskimages[i]; i++) {
			if (strcasecmp (ext, diskimages[i]) == 0)
				return ZFILE_DISKIMAGE;
		}
		if (strcasecmp (ext, _T("roz")) == 0)
			return ZFILE_ROM;
		if (strcasecmp (ext, _T("uss")) == 0)
			return ZFILE_STATEFILE;
		if (strcasecmp (ext, _T("rom")) == 0)
			return ZFILE_ROM;
		if (strcasecmp (ext, _T("bin")) == 0)
			return ZFILE_ROM;
		if (strcasecmp (ext, _T("key")) == 0)
			return ZFILE_KEY;
		if (strcasecmp (ext, _T("nvr")) == 0)
			return ZFILE_NVR;
		if (strcasecmp (ext, _T("uae")) == 0)
			return ZFILE_CONFIGURATION;
		if (strcasecmp(ext, _T("cue")) == 0 || strcasecmp(ext, _T("iso")) == 0 || strcasecmp(ext, _T("ccd")) == 0 ||
			strcasecmp(ext, _T("mds")) == 0 || strcasecmp(ext, _T("chd")) == 0 || strcasecmp(ext, _T("nrg")) == 0)
			return ZFILE_CDIMAGE;
	}
	memset (buf, 0, sizeof (buf));
	zfile_fread (buf, 8, 1, z);
	zfile_fseek (z, -8, SEEK_CUR);
	if (!memcmp (buf, exeheader, sizeof (buf)))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "CAPS", 4))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "SCP", 3))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "UAE--ADF", 8))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "UAE-1ADF", 8))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "Formatte", 8))
		return ZFILE_DISKIMAGE;
	if (!memcmp (buf, "RDSK", 4))
		return ZFILE_HDFRDB;
	if (!memcmp (buf, "DOS", 3)) {
		if (z->size < 4 * 1024 * 1024)
			return ZFILE_DISKIMAGE;
		else
			return ZFILE_HDF;
	}
	if (ext != NULL) {
		if (strcasecmp (ext, _T("hdf")) == 0)
			return ZFILE_HDF;
		if (strcasecmp (ext, _T("hdz")) == 0)
			return ZFILE_HDF;
		if (strcasecmp (ext, _T("vhd")) == 0)
			return ZFILE_HDF;
	}
	return ZFILE_UNKNOWN;
}

#define VHD_DYNAMIC 3
#define VHD_FIXED 2

STATIC_INLINE uae_u32 gl (uae_u8 *p)
{
	return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
}

static uae_u32 vhd_checksum (uae_u8 *p, int offset)
{
	int i;
	uae_u32 sum;

	sum = 0;
	for (i = 0; i < 512; i++) {
		if (offset >= 0 && i >= offset && i < offset + 4)
			continue;
		sum += p[i];
	}
	return ~sum;
}

struct zfile_vhd
{
	int vhd_type;
	uae_u64 virtsize;
	uae_u32 vhd_bamoffset;
	uae_u32 vhd_blocksize;
	uae_u8 *vhd_header, *vhd_sectormap;
	uae_u64 vhd_footerblock;
	uae_u32 vhd_bamsize;
	uae_u64 vhd_sectormapblock;
	uae_u32 vhd_bitmapsize;
};


static uae_u64 vhd_fread2 (struct zfile *zf, void *dataptrv, uae_u64 offset, uae_u64 len)
{
	uae_u32 bamoffset;
	uae_u32 sectoroffset;
	uae_u64 read;
	struct zfile *zp = zf->parent;
	struct zfile_vhd *zvhd = (struct zfile_vhd*)zf->userdata;
	uae_u8 *dataptr = (uae_u8*)dataptrv;

	//write_log (_T("%08x %08x\n"), (uae_u32)offset, (uae_u32)len);
	read = 0;
	if (offset & 511)
		return read;
	if (len & 511)
		return read;
	while (len > 0) {
		bamoffset = (offset / zvhd->vhd_blocksize) * 4 + zvhd->vhd_bamoffset;
		sectoroffset = gl (zvhd->vhd_header + bamoffset);
		if (sectoroffset == 0xffffffff) {
			memset (dataptr, 0, 512);
			read += 512;
		} else {
			int bitmapoffsetbits;
			int bitmapoffsetbytes;
			int sectormapblock;

			bitmapoffsetbits = (offset / 512) % (zvhd->vhd_blocksize / 512);
			bitmapoffsetbytes = bitmapoffsetbits / 8;
			sectormapblock = sectoroffset * 512 + (bitmapoffsetbytes & ~511);
			if (zvhd->vhd_sectormapblock != sectormapblock) {
				// read sector bitmap
				//write_log (_T("BM %08x\n"), sectormapblock);
				zfile_fseek (zp, sectormapblock, SEEK_SET);
				if (zfile_fread (zvhd->vhd_sectormap, 1, 512, zp) != 512)
					return read;
				zvhd->vhd_sectormapblock = sectormapblock;
			}
			// block allocated in bitmap?
			if (zvhd->vhd_sectormap[bitmapoffsetbytes & 511] & (1 << (7 - (bitmapoffsetbits & 7)))) {
				// read data block
				int block = sectoroffset * 512 + zvhd->vhd_bitmapsize + bitmapoffsetbits * 512;
				//write_log (_T("DB %08x\n"), block);
				zfile_fseek (zp, block, SEEK_SET);
				if (zfile_fread (dataptr, 1, 512, zp) != 512)
					return read;
			} else {
				memset (dataptr, 0, 512);
			}
			read += 512;
		}
		len -= 512;
		dataptr += 512;
		offset += 512;
	}
	return read;
}
static uae_s64 vhd_fread (void *data, uae_u64 l1, uae_u64 l2, struct zfile *zf)
{
	uae_u64 size = l1 * l2;
	uae_u64 out = 0;
	int len = 0;

	if (!l1 || !l2)
		return 0;
	if ((zf->seek & 511) || (size & 511)) {
		uae_u8 tmp[512];

		if (zf->seek & 511) {
			int s;
			s = 512 - (zf->seek & 511);
			vhd_fread2 (zf, tmp, zf->seek & ~511, 512);
			memcpy ((uae_u8*)data + len, tmp + 512 - s, s);
			len += s;
			out += s;
			zf->seek += s;
		}
		while (size > 0) {
			int s = size > 512 ? 512 : size;
			vhd_fread2 (zf, tmp, zf->seek, 512);
			memcpy ((uae_u8*)data + len, tmp, s);
			zf->seek += s;
			size -= s;
			out += s;
		}
	} else {
		out = vhd_fread2 (zf, data, zf->seek, size);
		zf->seek += out;
		out /= l1;
	}
	return out;
}

static struct zfile *vhd (struct zfile *z)
{
	uae_u8 tmp[512], tmp2[512];
	uae_u32 v;
	struct zfile_vhd *zvhd;
	uae_u64 fsize;

	zvhd = xcalloc (struct zfile_vhd, 1);
	zfile_fseek (z, 0, SEEK_END);
	fsize = zfile_ftell (z);
	zfile_fseek (z, 0, SEEK_SET);
	if (zfile_fread (tmp, 1, 512, z) != 512)
		goto nonvhd;
	v = gl (tmp + 8); // features
	if ((v & 3) != 2)
		goto nonvhd;
	v = gl (tmp + 8 + 4); // version
	if ((v >> 16) != 1)
		goto nonvhd;
	zvhd->vhd_type = gl (tmp + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 4 + 8 + 8 + 4);
	if (zvhd->vhd_type != VHD_FIXED && zvhd->vhd_type != VHD_DYNAMIC)
		goto nonvhd;
	v = gl (tmp + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 4 + 8 + 8 + 4 + 4);
	if (v == 0)
		goto nonvhd;
	if (vhd_checksum (tmp, 8 + 4 + 4 + 8 + 4 + 4 + 4 + 4 + 8 + 8 + 4 + 4) != v)
		goto nonvhd;
	zfile_fseek (z, fsize - sizeof tmp2, SEEK_SET);
	if (zfile_fread (tmp2, 1, 512, z) != 512)
		goto end;
	if (memcmp (tmp, tmp2, sizeof tmp))
		goto nonvhd;
	zvhd->vhd_footerblock = fsize - 512;
	zvhd->virtsize = (uae_u64)(gl (tmp + 8 + 4 + 4 + 8 + 4 + 4 +4 + 4 + 8)) << 32;
	zvhd->virtsize |= gl (tmp + 8 + 4 + 4 + 8 + 4 + 4 +4 + 4 + 8 + 4);
	if (zvhd->vhd_type == VHD_DYNAMIC) {
		uae_u32 size;
		zvhd->vhd_bamoffset = gl (tmp + 8 + 4 + 4 + 4);
		if (zvhd->vhd_bamoffset == 0 || zvhd->vhd_bamoffset >= fsize)
			goto end;
		zfile_fseek (z, zvhd->vhd_bamoffset, SEEK_SET);
		if (zfile_fread (tmp, 1, 512, z) != 512)
			goto end;
		v = gl (tmp + 8 + 8 + 8 + 4 + 4 + 4);
		if (vhd_checksum (tmp, 8 + 8 + 8 + 4 + 4 + 4) != v)
			goto end;
		v = gl (tmp + 8 + 8 + 8);
		if ((v >> 16) != 1)
			goto end;
		zvhd->vhd_blocksize = gl (tmp + 8 + 8 + 8 + 4 + 4);
		zvhd->vhd_bamoffset = gl (tmp + 8 + 8 + 4);
		zvhd->vhd_bamsize = (((zvhd->virtsize + zvhd->vhd_blocksize - 1) / zvhd->vhd_blocksize) * 4 + 511) & ~511;
		size = zvhd->vhd_bamoffset + zvhd->vhd_bamsize;
		zvhd->vhd_header = xmalloc (uae_u8, size);
		zfile_fseek (z, 0, SEEK_SET);
		if (zfile_fread (zvhd->vhd_header, 1, size, z) != size)
			goto end;
		zvhd->vhd_sectormap = xmalloc (uae_u8, 512);
		zvhd->vhd_sectormapblock = -1;
		zvhd->vhd_bitmapsize = ((zvhd->vhd_blocksize / (8 * 512)) + 511) & ~511;
	}
	z = zfile_fopen_parent (z, NULL, 0, zvhd->virtsize);
	z->useparent = 0;
	z->dataseek = 1;
	z->userdata = zvhd;
	z->zfileread = vhd_fread;
	write_log (_T("%s is VHD %s image, virtual size=%lldK\n"),
		zfile_getname (z),
		zvhd->vhd_type == 2 ? _T("fixed") : _T("dynamic"),
		zvhd->virtsize / 1024);
	return z;
nonvhd:
end:
	return z;
}

static struct zfile *zfile_gunzip (struct zfile *z, int *retcode)
{
	uae_u8 header[2 + 1 + 1 + 4 + 1 + 1];
	z_stream zs;
	int i, size, ret, first;
	uae_u8 flags;
	uae_s64 offset;
	TCHAR name[MAX_DPATH];
	uae_u8 buffer[8192];
	struct zfile *z2;
	uae_u8 b;

	if (checkwrite (z, retcode))
		return NULL;
	_tcscpy (name, z->name);
	memset (&zs, 0, sizeof (zs));
	memset (header, 0, sizeof (header));
	zfile_fread (header, sizeof (header), 1, z);
	flags = header[3];
	if (header[0] != 0x1f && header[1] != 0x8b)
		return NULL;
	if (flags & 2) /* multipart not supported */
		return NULL;
	if (flags & 32) /* encryption not supported */
		return NULL;
	if (flags & 4) { /* skip extra field */
		zfile_fread (&b, 1, 1, z);
		size = b;
		zfile_fread (&b, 1, 1, z);
		size |= b << 8;
		zfile_fseek (z, size + 2, SEEK_CUR);
	}
	if (flags & 8) { /* get original file name */
		uae_char aname[MAX_DPATH];
		i = 0;
		do {
			zfile_fread (aname + i, 1, 1, z);
		} while (i < MAX_DPATH - 1 && aname[i++]);
		aname[i] = 0;
		au_copy (name, MAX_DPATH, aname);
	}
	if (flags & 16) { /* skip comment */
		i = 0;
		do {
			b = 0;
			zfile_fread (&b, 1, 1, z);
		} while (b);
	}
	removeext (name, _T(".gz"));
	offset = zfile_ftell (z);
	zfile_fseek (z, -4, SEEK_END);
	zfile_fread (&b, 1, 1, z);
	size = b;
	zfile_fread (&b, 1, 1, z);
	size |= b << 8;
	zfile_fread (&b, 1, 1, z);
	size |= b << 16;
	zfile_fread (&b, 1, 1, z);
	size |= b << 24;
	if (size < 8 || size > 256 * 1024 * 1024) /* safety check */
		return NULL;
	zfile_fseek (z, offset, SEEK_SET);
	z2 = zfile_fopen_empty (z, name, size);
	if (!z2)
		return NULL;
	zs.next_out = z2->data;
	zs.avail_out = size;
	first = 1;
	ret = Z_STREAM_ERROR;
	do {
		zs.next_in = buffer;
		zs.avail_in = zfile_fread (buffer, 1, sizeof (buffer), z);
		if (first) {
			if (inflateInit2_ (&zs, -MAX_WBITS, ZLIB_VERSION, sizeof (z_stream)) != Z_OK)
				break;
			first = 0;
		}
		ret = inflate (&zs, 0);
	} while (ret == Z_OK);
	inflateEnd (&zs);
	if (ret != Z_STREAM_END || first != 0) {
		zfile_fclose (z2);
		return NULL;
	}
	zfile_fclose (z);
	return z2;
}
struct zfile *zfile_gunzip (struct zfile *z)
{
	return zfile_gunzip (z, NULL);
}

static void truncate880k (struct zfile *z)
{
	int i;
	uae_u8 *b;

	if (z == NULL || z->data == NULL)
		return;
	if (z->size < 880 * 512 * 2) {
		int size = 880 * 512 * 2 - z->size;
		b = xcalloc (uae_u8, size);
		zfile_fwrite (b, size, 1, z);
		xfree (b);
		return;
	}
	for (i = 880 * 512 * 2; i < z->size; i++) {
		if (z->data[i])
			return;
	}
	z->size = 880 * 512 * 2;
}

static struct zfile *extadf (struct zfile *z, int index, int *retcode)
{
	int i, r;
	struct zfile *zo;
	uae_u16 *mfm;
	uae_u16 *amigamfmbuffer;
	uae_u8 writebuffer_ok[32], *outbuf;
	int tracks, len, offs, pos;
	uae_u8 buffer[2 + 2 + 4 + 4];
	int outsize;
	TCHAR newname[MAX_DPATH];
	TCHAR *ext;
	int cantrunc = 0;
	int done = 0;

	if (index > 1)
		return NULL;

	mfm = xcalloc (uae_u16, 32000 / 2);
	amigamfmbuffer = xcalloc (uae_u16, 32000 / 2);
	outbuf = xcalloc (uae_u8, 16384);

	zfile_fread (buffer, 1, 8, z);
	zfile_fread (buffer, 1, 4, z);
	tracks = buffer[2] * 256 + buffer[3];
	offs = 8 + 2 + 2 + tracks * (2 + 2 + 4 + 4);

	_tcscpy (newname, zfile_getname (z));
	ext = _tcsrchr (newname, '.');
	if (ext) {
		_tcscpy (newname + _tcslen (newname) - _tcslen (ext), _T(".std.adf"));
	} else {
		_tcscat (newname, _T(".std.adf"));
	}
	if (index > 0)
		_tcscpy (newname + _tcslen (newname) - 4, _T(".ima"));

	zo = zfile_fopen_empty (z, newname, 0);
	if (!zo)
		goto end;

	if (retcode)
		*retcode = 1;
	pos = 12;
	outsize = 0;
	for (i = 0; i < tracks; i++) {
		int type, bitlen;

		zfile_fseek (z, pos, SEEK_SET);
		zfile_fread (buffer, 2 + 2 + 4 + 4, 1, z);
		pos = zfile_ftell (z);
		type = buffer[2] * 256 + buffer[3];
		len = buffer[5] * 65536 + buffer[6] * 256 + buffer[7];
		bitlen = buffer[9] * 65536 + buffer[10] * 256 + buffer[11];

		zfile_fseek (z, offs, SEEK_SET);
		if (type == 1) {
			zfile_fread (mfm, len, 1, z);
			memset (writebuffer_ok, 0, sizeof writebuffer_ok);
			memset (outbuf, 0, 16384);
			if (index == 0) {
				r = isamigatrack (amigamfmbuffer, (uae_u8*)mfm, len, outbuf, writebuffer_ok, i, &outsize);
				if (r < 0 && i == 0) {
					zfile_seterror (_T("'%s' is not AmigaDOS formatted"), zo->name);
					goto end;
				}
				if (i == 0)
					done = 1;
			} else {
				r = ispctrack (amigamfmbuffer, (uae_u8*)mfm, len, outbuf, writebuffer_ok, i, &outsize);
				if (r < 0 && i == 0) {
					zfile_seterror (_T("'%s' is not PC formatted"), zo->name);
					goto end;
				}
				if (i == 0)
					done = 1;
			}
		} else {
			outsize = 512 * 11;
			if (bitlen / 8 > 18000)
				outsize *= 2;
			zfile_fread (outbuf, outsize, 1, z);
			cantrunc = 1;
			if (index == 0)
				done = 1;
		}
		zfile_fwrite (outbuf, outsize, 1, zo);

		offs += len;

	}
	if (done == 0)
		goto end;
	zfile_fclose (z);
	xfree (mfm);
	xfree (amigamfmbuffer);
	if (cantrunc)
		truncate880k (zo);
	return zo;
end:
	zfile_fclose (zo);
	xfree (mfm);
	xfree (amigamfmbuffer);
	return NULL;
}


#include "fdi2raw.h"
static struct zfile *fdi (struct zfile *z, int index, int *retcode)
{
	int i, j, r;
	struct zfile *zo;
	TCHAR *orgname = zfile_getname (z);
	TCHAR *ext = _tcsrchr (orgname, '.');
	TCHAR newname[MAX_DPATH];
	uae_u16 *amigamfmbuffer;
	uae_u8 writebuffer_ok[32], *outbuf;
	int tracks, len, outsize;
	FDI *fdi;
	int startpos = 0;
	uae_u8 tmp[12];
	struct zcache *zc;

	if (checkwrite (z, retcode))
		return NULL;
	if (index > 2)
		return NULL;

	zc = cache_get (z->name);
	if (!zc) {
		uae_u16 *mfm;
		struct zdiskimage *zd;
		fdi = fdi2raw_header (z);
		if (!fdi)
			return NULL;
		mfm = xcalloc (uae_u16, 32000 / 2);
		zd = xcalloc (struct zdiskimage, 1);
		tracks = fdi2raw_get_last_track (fdi);
		zd->tracks = tracks;
		for (i = 0; i < tracks; i++) {
			uae_u8 *buf, *p;
			fdi2raw_loadtrack (fdi, mfm, NULL, i, &len, NULL, NULL, 1);
			len /= 8;
			buf = p = xmalloc (uae_u8, len);
			for (j = 0; j < len / 2; j++) {
				uae_u16 v = mfm[j];
				*p++ = v >> 8;
				*p++ = v;
			}
			zd->zdisktracks[i].data = buf;
			zd->zdisktracks[i].len = len;
		}
		fdi2raw_header_free (fdi);
		zc = zcache_put (z->name, zd);
	}

	amigamfmbuffer = xcalloc (uae_u16, 32000 / 2);
	outbuf = xcalloc (uae_u8, 16384);
	tracks = zc->zd->tracks;
	if (ext) {
		_tcscpy (newname, orgname);
		_tcscpy (newname + _tcslen (newname) - _tcslen (ext), _T(".adf"));
	} else {
		_tcscat (newname, _T(".adf"));
	}
	if (index == 1)
		_tcscpy (newname + _tcslen (newname) - 4, _T(".ima"));
	if (index == 2)
		_tcscpy (newname + _tcslen (newname) - 4, _T(".ext.adf"));
	zo = zfile_fopen_empty (z, newname, 0);
	if (!zo)
		goto end;
	if (retcode)
		*retcode = 1;
	if (index > 1) {
		zfile_fwrite ("UAE-1ADF", 8, 1, zo);
		tmp[0] = 0; tmp[1] = 0; /* flags (reserved) */
		tmp[2] = 0; tmp[3] = tracks; /* number of tracks */
		zfile_fwrite (tmp, 4, 1, zo);
		memset (tmp, 0, sizeof tmp);
		tmp[2] = 0; tmp[3] = 1; /* track type */
		startpos = zfile_ftell (zo);
		for (i = 0; i < tracks; i++)
			zfile_fwrite (tmp, sizeof tmp, 1, zo);
	}
	outsize = 0;
	for (i = 0; i < tracks; i++) {
		uae_u8 *p = (uae_u8*)zc->zd->zdisktracks[i].data;
		len = zc->zd->zdisktracks[i].len;
		memset (writebuffer_ok, 0, sizeof writebuffer_ok);
		memset (outbuf, 0, 16384);
		if (index == 0) {
			r = isamigatrack (amigamfmbuffer, p, len, outbuf, writebuffer_ok, i, &outsize);
			if (r < 0 && i == 0) {
				zfile_seterror (_T("'%s' is not AmigaDOS formatted"), orgname);
				goto end;
			}
			zfile_fwrite (outbuf, outsize, 1, zo);
		} else if (index == 1) {
			r = ispctrack (amigamfmbuffer, p, len, outbuf, writebuffer_ok, i, &outsize);
			if (r < 0 && i == 0) {
				zfile_seterror (_T("'%s' is not PC formatted"), orgname);
				goto end;
			}
			zfile_fwrite (outbuf, outsize, 1, zo);
		} else {
			int pos = zfile_ftell (zo);
			int maxlen = len > 12798 ? len : 12798;
			int lenb = len * 8;

			if (maxlen & 1)
				maxlen++;
			zfile_fseek (zo, startpos + i * 12 + 4, SEEK_SET);
			tmp[4] = 0; tmp[5] = 0; tmp[6] = maxlen >> 8; tmp[7] = maxlen;
			tmp[8] = lenb >> 24; tmp[9] = lenb >> 16; tmp[10] = lenb >> 8; tmp[11] = lenb;
			zfile_fwrite (tmp + 4, 2, 4, zo);
			zfile_fseek (zo, pos, SEEK_SET);
			zfile_fwrite (p, 1, len, zo);
			if (maxlen > len)
				zfile_fwrite (outbuf, 1, maxlen - len, zo);
		}
	}
	zfile_fclose (z);
	xfree (amigamfmbuffer);
	xfree (outbuf);
	if (index == 0)
		truncate880k (zo);
	return zo;
end:
	zfile_fclose (zo);
	xfree (amigamfmbuffer);
	xfree (outbuf);
	return NULL;
}

#ifdef CAPS
#include "caps/caps_win32.h"
static struct zfile *ipf (struct zfile *z, int index, int *retcode)
{
	int i, j, r;
	struct zfile *zo;
	TCHAR *orgname = zfile_getname (z);
	TCHAR *ext = _tcsrchr (orgname, '.');
	TCHAR newname[MAX_DPATH];
	uae_u16 *amigamfmbuffer;
	uae_u8 writebuffer_ok[32];
	int tracks, len;
	int outsize;
	int startpos = 0;
	uae_u8 *outbuf;
	uae_u8 tmp[12];
	struct zcache *zc;

	if (checkwrite (z, retcode))
		return NULL;

	if (index > 2)
		return NULL;

	zc = cache_get (z->name);
	if (!zc) {
		uae_u16 *mfm;
		struct zdiskimage *zd;
		if (!caps_loadimage (z, 0, &tracks))
			return NULL;
		mfm = xcalloc (uae_u16, 32000 / 2);
		zd = xcalloc (struct zdiskimage, 1);
		zd->tracks = tracks;
		for (i = 0; i < tracks; i++) {
			uae_u8 *buf, *p;
			int mrev, gapo;
			caps_loadtrack (mfm, NULL, 0, i, &len, &mrev, &gapo, NULL, true);
			//write_log (_T("%d: %d %d %d\n"), i, mrev, gapo, len);
			len /= 8;
			buf = p = xmalloc (uae_u8, len);
			for (j = 0; j < len / 2; j++) {
				uae_u16 v = mfm[j];
				*p++ = v >> 8;
				*p++ = v;
			}
			zd->zdisktracks[i].data = buf;
			zd->zdisktracks[i].len = len;
		}
		caps_unloadimage (0);
		zc = zcache_put (z->name, zd);
	}

	outbuf = xcalloc (uae_u8, 16384);
	amigamfmbuffer = xcalloc (uae_u16, 32000 / 2);
	if (ext) {
		_tcscpy (newname, orgname);
		_tcscpy (newname + _tcslen (newname) - _tcslen (ext), _T(".adf"));
	} else {
		_tcscat (newname, _T(".adf"));
	}
	if (index == 1)
		_tcscpy (newname + _tcslen (newname) - 4, _T(".ima"));
	if (index == 2)
		_tcscpy (newname + _tcslen (newname) - 4, _T(".ext.adf"));

	zo = zfile_fopen_empty (z, newname, 0);
	if (!zo)
		goto end;

	if (retcode)
		*retcode = 1;

	tracks = zc->zd->tracks;

	if (index > 1) {
		zfile_fwrite ("UAE-1ADF", 8, 1, zo);
		tmp[0] = 0; tmp[1] = 0; /* flags (reserved) */
		tmp[2] = 0; tmp[3] = tracks; /* number of tracks */
		zfile_fwrite (tmp, 4, 1, zo);
		memset (tmp, 0, sizeof tmp);
		tmp[2] = 0; tmp[3] = 1; /* track type */
		startpos = zfile_ftell (zo);
		for (i = 0; i < tracks; i++)
			zfile_fwrite (tmp, sizeof tmp, 1, zo);
	}

	outsize = 0;
	for (i = 0; i < tracks; i++) {
		uae_u8 *p = (uae_u8*)zc->zd->zdisktracks[i].data;
		len = zc->zd->zdisktracks[i].len;
		memset (writebuffer_ok, 0, sizeof writebuffer_ok);
		memset (outbuf, 0, 16384);
		if (index == 0) {
			r = isamigatrack (amigamfmbuffer, p, len, outbuf, writebuffer_ok, i, &outsize);
			if (r < 0 && i == 0) {
				zfile_seterror (_T("'%s' is not AmigaDOS formatted"), orgname);
				goto end;
			}
			zfile_fwrite (outbuf, 1, outsize, zo);
		} else if (index == 1) {
			r = ispctrack (amigamfmbuffer, p, len, outbuf, writebuffer_ok, i, &outsize);
			if (r < 0 && i == 0) {
				zfile_seterror (_T("'%s' is not PC formatted"), orgname);
				goto end;
			}
			zfile_fwrite (outbuf, outsize, 1, zo);
		} else {
			int pos = zfile_ftell (zo);
			int maxlen = len > 12798 ? len : 12798;
			int lenb = len * 8;

			if (maxlen & 1)
				maxlen++;
			zfile_fseek (zo, startpos + i * 12 + 4, SEEK_SET);
			tmp[4] = 0; tmp[5] = 0; tmp[6] = maxlen >> 8; tmp[7] = maxlen;
			tmp[8] = lenb >> 24; tmp[9] = lenb >> 16; tmp[10] = lenb >> 8; tmp[11] = lenb;
			zfile_fwrite (tmp + 4, 2, 4, zo);
			zfile_fseek (zo, pos, SEEK_SET);
			zfile_fwrite (p, 1, len, zo);
			if (maxlen > len)
				zfile_fwrite (outbuf, 1, maxlen - len, zo);
		}
	}
	zfile_fclose (z);
	xfree (amigamfmbuffer);
	xfree (outbuf);
	if (index == 0)
		truncate880k (zo);
	return zo;
end:
	zfile_fclose (zo);
	xfree (amigamfmbuffer);
	xfree (outbuf);
	return NULL;
}
#endif

#ifdef A_LZX
static struct zfile *dsq (struct zfile *z, int lzx, int *retcode)
{
	struct zfile *zi = NULL;
	struct zvolume *zv = NULL;

	if (checkwrite (z, retcode))
		return NULL;
	if (lzx) {
		zv = archive_directory_lzx (z);
		if (zv) {
			if (zv->root.child)
				zi = archive_access_lzx (zv->root.child);
		}
	} else {
		zi = z;
	}
	if (zi) {
		uae_u8 *buf = zfile_getdata (zi, 0, -1, NULL);
		if (!memcmp (buf, "PKD\x13", 4) || !memcmp (buf, "PKD\x11", 4)) {
			TCHAR *fn;
			int sectors = buf[18];
			int reserved = buf[15];
			int blocks = (buf[6] << 8) | buf[7];
			int blocksize = (buf[10] << 8) | buf[11];
			struct zfile *zo;
			int size = blocks * blocksize;
			int off;
			int i;
			uae_u8 *bitmap = NULL;
			uae_u8 *nullsector;

			nullsector = xcalloc (uae_u8, blocksize);
			sectors /= 2;
			if (buf[3] == 0x13) {
				off = 52;
				if (buf[off - 1] == 1) {
					bitmap = &buf[off];
					off += (blocks + 7) / 8;
				} else if (buf[off - 1] > 1) {
					write_log (_T("unknown DSQ extra header type %d\n"), buf[off - 1]);
				}
			} else {
				off = 32;
			}

			// some Amiga disk images are smaller than full adf for some reason
			if (sectors == 11 && size < 1760 * 512)
				size = 1760 * 512;

			if (zfile_getfilename (zi) && _tcslen (zfile_getfilename (zi))) {
				fn = xmalloc (TCHAR, (_tcslen (zfile_getfilename (zi)) + 5));
				_tcscpy (fn, zfile_getfilename (zi));
				_tcscat (fn, _T(".adf"));
			} else {
				fn = my_strdup (_T("dsq.adf"));
			}
			zo = zfile_fopen_empty (z, fn, size);
			xfree (fn);
			int seccnt = 0;
			for (i = 0; i < blocks; i++) {
				int bmoff = i - 2;
				int boff = -1;
				uae_u32 mask = 0;
				if (bitmap) {
					boff = (bmoff / 32) * 4;
					mask = (bitmap[boff] << 24) | (bitmap[boff + 1] << 16) | (bitmap[boff + 2] << 8) | (bitmap[boff + 3]);
				}
				if (bmoff >= 0 && boff >= 0 && (mask & (1 << (bmoff & 31)))) {
					zfile_fwrite (nullsector, blocksize, 1, zo);
				} else {
					zfile_fwrite (buf + off, blocksize, 1, zo);
					off += blocksize;
					seccnt++;
				}
				if ((i % sectors) == sectors - 1) {
					off += seccnt * 16;
					seccnt = 0;
				}
			}
			zfile_fclose_archive (zv);
			zfile_fclose (z);
			xfree (buf);
			xfree (nullsector);
			return zo;
		}
		xfree (buf);
	}
	if (lzx)
		zfile_fclose (zi);
	return z;
}
#endif

#ifdef A_WRP
static struct zfile *wrp (struct zfile *z, int *retcode)
{
	if (zfile_needwrite (z)) {
		if (retcode)
			*retcode = -1;
		return NULL;
	}
	return unwarp (z);
}
#endif

#ifdef A_7Z
#include "7z/Xz.h"
#include "7z/Lzmadec.h"
#include "7z/7zCrc.h"

static void *SzAlloc (void *p, size_t size)
{
	return xmalloc (uae_u8, size);
}
static void SzFree(void *p, void *address)
{
	xfree (address);
}
#define XZ_OUT_SIZE 10000
#define XZ_IN_SIZE 10000
static struct zfile *xz (struct zfile *z, int *retcode)
{
	static bool iscrc;
	ISzAlloc allocImp;
	CXzUnpacker cx;
	ECoderStatus status;
	struct zfile *zo = NULL;
	uae_u8 out[XZ_OUT_SIZE], in[XZ_IN_SIZE];

	if (checkwrite (z, retcode))
		return NULL;
	memset (&cx, 0, sizeof cx);
	allocImp.Alloc = SzAlloc;
	allocImp.Free = SzFree;
	if (!iscrc)
		CrcGenerateTable ();
	iscrc = true;
//	if (XzUnpacker_Create (&cx, &allocImp) != SZ_OK)
//		return NULL;
	XzUnpacker_Construct (&cx, &allocImp);
	int outwritten = 0;
	int towrite = 0;
	bool first = true;
	for (;;) {
		int read = zfile_fread (in, 1, XZ_IN_SIZE, z);
		if (first) {
			if (!(in[0] == 0xfd && in[1] == 0x37 && in[2] == 0x7a && in[3] == 0x58 && in[4] == 0x5a && in[5] == 0))
				break;
		}
		first = false;
		if (read == 0)
			break;
		if (read < 0) {
			zfile_fclose (zo);
			zo = NULL;
			break;
		}
		if (!zo)
			zo = zfile_fopen_empty (z, z->name);
		if (!zo)
			break;
		uae_u8 *inp = in;
		for (;;) {
			SizeT srclen = read;
			SizeT outlen = XZ_OUT_SIZE;
			if (XzUnpacker_Code (&cx, out, &outlen, inp, &srclen, LZMA_FINISH_ANY, &status) != SZ_OK) {
				zfile_fclose (zo);
				zo = NULL;
				break;
			}
			if (status != CODER_STATUS_NEEDS_MORE_INPUT && status != CODER_STATUS_NOT_FINISHED) {
				zfile_fclose (zo);
				zo = NULL;
				break;
			}
			zfile_fwrite (out, outlen, 1, zo);
			if (status == CODER_STATUS_FINISHED_WITH_MARK)
				break;
			if (srclen == read)
				break;
			inp += srclen;
			read -= srclen;
		}
	}
	XzUnpacker_Free (&cx);
	return zo;
}
#endif

#ifdef A_DMS
static struct zfile *dms (struct zfile *z, int index, int *retcode)
{
	int ret;
	struct zfile *zo;
	TCHAR *orgname = zfile_getname (z);
	TCHAR *ext = _tcsrchr (orgname, '.');
	TCHAR newname[MAX_DPATH];
	static int recursive;
	int i;
	struct zfile *zextra[DMS_EXTRA_SIZE] = { 0 };

	if (checkwrite (z, retcode))
		return NULL;
	if (recursive)
		return NULL;
	if (ext) {
		_tcscpy (newname, orgname);
		_tcscpy (newname + _tcslen (newname) - _tcslen (ext), _T(".adf"));
	} else {
		_tcscat (newname, _T(".adf"));
	}

	zo = zfile_fopen_empty (z, newname, 1760 * 512);
	if (!zo)
		return NULL;
	ret = DMS_Process_File (z, zo, CMD_UNPACK, OPT_VERBOSE, 0, 0, 0, zextra);
	if (ret == NO_PROBLEM || ret == DMS_FILE_END) {
		int off = zfile_ftell (zo);
		if (off >= 1760 * 512 / 3 && off <= 1760 * 512 * 3 / 4) { // possible split dms?
			if (_tcslen (orgname) > 5) {
				TCHAR *s = orgname + _tcslen (orgname) - 5;
				if (!_tcsicmp (s, _T("a.dms"))) {
					TCHAR *fn2 = my_strdup (orgname);
					struct zfile *z2;
					fn2[_tcslen (fn2) - 5]++;
					recursive++;
					z2 = zfile_fopen (fn2, _T("rb"), z->zfdmask);
					recursive--;
					if (z2) {
						ret = DMS_Process_File (z2, zo, CMD_UNPACK, OPT_VERBOSE, 0, 0, 1, NULL);
						zfile_fclose (z2);
					}
					xfree (fn2);
				}
			}
		}
		zfile_fseek (zo, 0, SEEK_SET);
		if (index > 0) {
			zfile_fclose (zo);
			zo = NULL;
			for (i = 0; i < DMS_EXTRA_SIZE && zextra[i]; i++);
			if (index > i)
				goto end;
			zo = zextra[index - 1];
			zextra[index - 1] = NULL;
		}
		if (retcode)
			*retcode = 1;
		zfile_fclose (z);
		z = NULL;

	} else {
		zfile_fclose (zo);
		zo = NULL;
	}
end:
	for (i = 0; i < DMS_EXTRA_SIZE; i++)
		zfile_fclose (zextra[i]);
	return zo;
}
#endif

const TCHAR *uae_ignoreextensions[] =
{ _T(".gif"), _T(".jpg"), _T(".png"), _T(".xml"), _T(".pdf"), _T(".txt"), 0 };
const TCHAR *uae_diskimageextensions[] =
{ _T(".adf"), _T(".adz"), _T(".ipf"), _T(".scp"), _T(".fdi"), _T(".exe"), _T(".dms"), _T(".wrp"), _T(".dsq"), 0 };

int zfile_is_ignore_ext (const TCHAR *name)
{
	int i;
	const TCHAR *ext;

	ext = _tcsrchr (name, '.');
	if (!ext)
		return 0;
	for (i = 0; uae_ignoreextensions[i]; i++) {
		if (!strcasecmp (uae_ignoreextensions[i], ext))
			return 1;
	}
	return 0;
}

int zfile_is_diskimage (const TCHAR *name)
{
	int i;

	const TCHAR *ext = _tcsrchr (name, '.');
	if (!ext)
		return 0;
	i = 0;
	while (uae_diskimageextensions[i]) {
		if (!strcasecmp (ext, uae_diskimageextensions[i]))
			return HISTORY_FLOPPY;
		i++;
	}
	if (!_tcsicmp (ext, _T(".cue")))
		return HISTORY_CD;
	return -1;
}


static const TCHAR *archive_extensions[] = {
	_T("7z"), _T("rar"), _T("zip"), _T("lha"), _T("lzh"), _T("lzx"),
	_T("adf"), _T("adz"), _T("dsq"), _T("dms"), _T("ipf"), _T("fdi"), _T("wrp"), _T("ima"),
	_T("hdf"), _T("tar"),
	NULL
};
static const TCHAR *plugins_7z[] = { _T("7z"), _T("rar"), _T("zip"), _T("lha"), _T("lzh"), _T("lzx"), _T("adf"), _T("dsq"), _T("hdf"), _T("tar"), NULL };
#if defined(ARCHIVEACCESS)
static const uae_char *plugins_7z_x[] = { "7z", "Rar!", "MK", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
#endif
static const int plugins_7z_t[] = {
	ArchiveFormat7Zip, ArchiveFormatRAR, ArchiveFormatZIP, ArchiveFormatLHA, ArchiveFormatLHA, ArchiveFormatLZX,
	ArchiveFormatADF, ArchiveFormatADF, ArchiveFormatADF, ArchiveFormatTAR
};
static const int plugins_7z_m[] = {
	ZFD_ARCHIVE, ZFD_ARCHIVE, ZFD_ARCHIVE, ZFD_ARCHIVE, ZFD_ARCHIVE, ZFD_ARCHIVE,
	ZFD_ADF, ZFD_ADF, ZFD_ADF, ZFD_ARCHIVE
};

static int iszip (struct zfile *z, int mask)
{
	TCHAR *name = z->name;
	TCHAR *ext = _tcsrchr (name, '.');
	uae_u8 header[32];

	if (!ext)
		return 0;
	memset (header, 0, sizeof (header));
	zfile_fseek (z, 0, SEEK_SET);
	zfile_fread (header, sizeof (header), 1, z);
	zfile_fseek (z, 0, SEEK_SET);

	if (mask & ZFD_ARCHIVE) {
		if (!strcasecmp (ext, _T(".zip")) || !strcasecmp (ext, _T(".rp9"))) {
			if (header[0] == 'P' && header[1] == 'K')
				return ArchiveFormatZIP;
			return 0;
		}
	}
	if (mask & ZFD_ARCHIVE) {
		if (!strcasecmp (ext, _T(".7z"))) {
			if (header[0] == '7' && header[1] == 'z')
				return ArchiveFormat7Zip;
			return 0;
		}
		if (!strcasecmp (ext, _T(".rar"))) {
			if (header[0] == 'R' && header[1] == 'a' && header[2] == 'r' && header[3] == '!')
				return ArchiveFormatRAR;
			return 0;
		}
		if (!strcasecmp (ext, _T(".lha")) || !strcasecmp (ext, _T(".lzh"))) {
			if (header[2] == '-' && header[3] == 'l' && header[4] == 'h' && header[6] == '-')
				return ArchiveFormatLHA;
			return 0;
		}
		if (!strcasecmp (ext, _T(".lzx"))) {
			if (header[0] == 'L' && header[1] == 'Z' && header[2] == 'X')
				return ArchiveFormatLZX;
			return 0;
		}
	}
	if (mask & ZFD_ADF) {
		if (!strcasecmp (ext, _T(".adf"))) {
			if (header[0] == 'D' && header[1] == 'O' && header[2] == 'S' && (header[3] >= 0 && header[3] <= 7))
				return ArchiveFormatADF;
			if (isfat (header))
				return ArchiveFormatFAT;
			return 0;
		}
		if (!strcasecmp (ext, _T(".ima"))) {
			if (isfat (header))
				return ArchiveFormatFAT;
		}
	}
	if (mask & ZFD_HD) {
		if (!strcasecmp (ext, _T(".hdf"))) {
			if (header[0] == 'D' && header[1] == 'O' && header[2] == 'S' && (header[3] >= 0 && header[3] <= 7))
				return ArchiveFormatADF;
			if (header[0] == 'S' && header[1] == 'F' && header[2] == 'S')
				return ArchiveFormatADF;
			if (header[0] == 'R' && header[1] == 'D' && header[2] == 'S' && header[3] == 'K')
				return ArchiveFormatRDB;
			if (isfat (header))
				return ArchiveFormatFAT;
			return 0;
		}
	}
#if defined(ARCHIVEACCESS)
	for (int i = 0; plugins_7z_x[i]; i++) {
		if ((plugins_7z_m[i] & mask) && plugins_7z_x[i] && !strcasecmp (ext + 1, plugins_7z[i]) &&
			!memcmp (header, plugins_7z_x[i], strlen (plugins_7z_x[i])))
			return plugins_7z_t[i];
	}
#endif
	return 0;
}
int iszip (struct zfile *z)
{
	return iszip (z, ZFD_NORMAL);
}

struct zfile *zuncompress (struct znode *parent, struct zfile *z, int dodefault, int mask, int *retcode, int index)
{
	TCHAR *name = z->name;
	TCHAR *ext = NULL;
	uae_u8 header[32];

	if (retcode)
		*retcode = 0;
	if (!mask)
		return NULL;
	if (name) {
		ext = _tcsrchr (name, '.');
		if (ext)
			ext++;
	}

	if (ext != NULL) {
		if (mask & ZFD_ARCHIVE) {
			if (strcasecmp (ext, _T("7z")) == 0)
				return archive_access_select (parent, z, ArchiveFormat7Zip, dodefault, retcode, index);
			if (strcasecmp (ext, _T("zip")) == 0)
				return archive_access_select (parent, z, ArchiveFormatZIP, dodefault, retcode, index);
			if (strcasecmp (ext, _T("lha")) == 0 || strcasecmp (ext, _T("lzh")) == 0)
				return archive_access_select (parent, z, ArchiveFormatLHA, dodefault, retcode, index);
			if (strcasecmp (ext, _T("lzx")) == 0)
				return archive_access_select (parent, z, ArchiveFormatLZX, dodefault, retcode, index);
			if (strcasecmp (ext, _T("rar")) == 0)
				return archive_access_select (parent, z, ArchiveFormatRAR, dodefault, retcode, index);
			if (strcasecmp (ext, _T("tar")) == 0)
				return archive_access_select (parent, z, ArchiveFormatTAR, dodefault, retcode, index);
		}
		if (mask & ZFD_UNPACK) {
			if (index == 0) {
				if (strcasecmp (ext, _T("gz")) == 0)
					return zfile_gunzip (z, retcode);
				if (strcasecmp (ext, _T("adz")) == 0)
					return zfile_gunzip (z, retcode);
				if (strcasecmp (ext, _T("roz")) == 0)
					return zfile_gunzip (z, retcode);
				if (strcasecmp (ext, _T("hdz")) == 0)
					return zfile_gunzip (z, retcode);
#ifdef A_WRP
				if (strcasecmp (ext, _T("wrp")) == 0)
					return wrp (z, retcode);
#endif
#ifdef A_7Z
				if (strcasecmp (ext, _T("xz")) == 0)
					return xz (z, retcode);
#endif
			}
#ifdef A_DMS
			if (strcasecmp (ext, _T("dms")) == 0)
				return dms (z, index, retcode);
#endif
		}
		if (mask & ZFD_RAWDISK) {
#ifdef CAPS
			if (strcasecmp (ext, _T("ipf")) == 0)
				return ipf (z, index, retcode);
#endif
			if (strcasecmp (ext, _T("fdi")) == 0)
				return fdi (z, index, retcode);
			if (mask & (ZFD_RAWDISK_PC | ZFD_RAWDISK_AMIGA))
				return NULL;
		}
#if defined(ARCHIVEACCESS)
		if (index == 0) {
			for (int i = 0; plugins_7z_x[i]; i++) {
				if ((plugins_7z_t[i] & mask) && strcasecmp (ext, plugins_7z[i]) == 0)
					return archive_access_arcacc_select (z, plugins_7z_t[i], retcode);
			}
		}
#endif
	}
	memset (header, 0, sizeof (header));
	zfile_fseek (z, 0, SEEK_SET);
	zfile_fread (header, sizeof (header), 1, z);
	zfile_fseek (z, 0, SEEK_SET);
	if (!memcmp (header, "conectix", 8)) {
		if (index > 0)
			return NULL;
		return vhd (z);
	}
	if (mask & ZFD_UNPACK) {
		if (index == 0) {
			if (header[0] == 0x1f && header[1] == 0x8b)
				return zfile_gunzip (z, retcode);
#ifdef A_LZX
			if (header[0] == 'P' && header[1] == 'K' && header[2] == 'D')
				return dsq (z, 0, retcode);
#endif
#ifdef A_7Z
			if (header[0] == 0xfd && header[1] == 0x37 && header[2] == 0x7a && header[3] == 0x58 && header[4] == 0x5a && header[5] == 0)
				return xz (z, retcode);
#endif
		}
#ifdef A_DMS
		if (header[0] == 'D' && header[1] == 'M' && header[2] == 'S' && header[3] == '!')
			return dms (z, index, retcode);
#endif
	}
	if (mask & ZFD_RAWDISK) {
#ifdef CAPS
		if (header[0] == 'C' && header[1] == 'A' && header[2] == 'P' && header[3] == 'S')
			return ipf (z, index, retcode);
#endif
		if (!memcmp (header, "Formatte", 8))
			return fdi (z, index, retcode);
		if (!memcmp (header, "UAE-1ADF", 8))
			return extadf (z, index, retcode);
	}
	if (index > 0)
		return NULL;
	if (mask & ZFD_ARCHIVE) {
		if (header[0] == 'P' && header[1] == 'K')
			return archive_access_select (parent, z, ArchiveFormatZIP, dodefault, retcode, index);
		if (header[0] == 'R' && header[1] == 'a' && header[2] == 'r' && header[3] == '!')
			return archive_access_select (parent, z, ArchiveFormatRAR, dodefault, retcode, index);
		if (header[0] == 'L' && header[1] == 'Z' && header[2] == 'X')
			return archive_access_select (parent, z, ArchiveFormatLZX, dodefault, retcode, index);
		if (header[2] == '-' && header[3] == 'l' && header[4] == 'h' && header[6] == '-')
			return archive_access_select (parent, z, ArchiveFormatLHA, dodefault, retcode, index);
	}
	if (mask & ZFD_ADF) {
		if (header[0] == 'D' && header[1] == 'O' && header[2] == 'S' && (header[3] >= 0 && header[3] <= 7))
			return archive_access_select (parent, z, ArchiveFormatADF, dodefault, retcode, index);
		if (header[0] == 'S' && header[1] == 'F' && header[2] == 'S')
			return archive_access_select (parent, z, ArchiveFormatADF, dodefault, retcode, index);
		if (isfat (header))
			return archive_access_select (parent, z, ArchiveFormatFAT, dodefault, retcode, index);
	}

	if (ext) {
		if (mask & ZFD_UNPACK) {
#ifdef A_LZX
			if (strcasecmp (ext, _T("dsq")) == 0)
				return dsq (z, 1, retcode);
#endif
		}
		if (mask & ZFD_ADF) {
			if (strcasecmp (ext, _T("adf")) == 0 && !memcmp (header, "DOS", 3))
				return archive_access_select (parent, z, ArchiveFormatADF, dodefault, retcode, index);
		}
	}
	return NULL;
}


#ifdef SINGLEFILE
extern uae_u8 singlefile_data[];

static struct zfile *zfile_opensinglefile(struct zfile *l)
{
	uae_u8 *p = singlefile_data;
	int size, offset;
	TCHAR tmp[256], *s;

	_tcscpy (tmp, l->name);
	s = tmp + _tcslen (tmp) - 1;
	while (*s != 0 && *s != '/' && *s != '\\')
		s--;
	if (s > tmp)
		s++;
	write_log (_T("loading from singlefile: '%s'\n"), tmp);
	while (*p++);
	offset = (p[0] << 24)|(p[1] << 16)|(p[2] << 8)|(p[3] << 0);
	p += 4;
	for (;;) {
		size = (p[0] << 24)|(p[1] << 16)|(p[2] << 8)|(p[3] << 0);
		if (!size)
			break;
		if (!strcmpi (tmp, p + 4)) {
			l->data = singlefile_data + offset;
			l->size = size;
			write_log (_T("found, size %d\n"), size);
			return l;
		}
		offset += size;
		p += 4;
		p += _tcslen (p) + 1;
	}
	write_log (_T("not found\n"));
	return 0;
}
#endif

static struct zfile *zfile_fopen_nozip (const TCHAR *name, const TCHAR *mode)
{
	struct zfile *l;
	FILE *f;

	if(*name == '\0')
		return NULL;
	l = zfile_create (NULL, name);
	l->name = my_strdup (name);
	l->mode = my_strdup (mode);
	f = uae_tfopen (name, mode);
	if (!f) {
		zfile_fclose (l);
		return 0;
	}
	l->f = f;
	return l;
}

static struct zfile *openzip (const TCHAR *pname)
{
	int i, j;
	TCHAR v;
	TCHAR name[MAX_DPATH];
	TCHAR zippath[MAX_DPATH];

	zippath[0] = 0;
	_tcscpy (name, pname);
	i = _tcslen (name) - 2;
	while (i > 0) {
		if ((name[i] == '/' || name[i] == '\\') && i > 4) {
			v = name[i];
			name[i] = 0;
			for (j = 0; plugins_7z[j]; j++) {
				int len = _tcslen (plugins_7z[j]);
				if (name[i - len - 1] == '.' && !strcasecmp (name + i - len, plugins_7z[j])) {
					struct zfile *f = zfile_fopen_nozip (name, _T("rb"));
					if (f) {
						f->zipname = my_strdup (name + i + 1);
						return f;
					}
					break;
				}
			}
			name[i] = v;
		}
		i--;
	}
	return 0;
}

static bool writeneeded (const TCHAR *mode)
{
	return _tcschr (mode, 'w') || _tcschr (mode, 'a') || _tcschr (mode, '+') || _tcschr (mode, 't');
}
bool zfile_needwrite (struct zfile *zf)
{
	if (!zf->mode)
		return false;
	return writeneeded (zf->mode);
}

static struct zfile *zfile_fopen_2 (const TCHAR *name, const TCHAR *mode, int mask)
{
	struct zfile *l;
	FILE *f;

	if(*name == '\0')
		return NULL;
#ifdef SINGLEFILE
	if (zfile_opensinglefile (l))
		return l;
#endif
	l = openzip (name);
	if (l) {
		if (writeneeded (mode)) {
			zfile_fclose (l);
			return 0;
		}
		l->zfdmask = mask;
	} else {
		struct mystat st;
		l = zfile_create (NULL, name);
		l->mode = my_strdup (mode);
		l->name = my_strdup (name);
		l->zfdmask = mask;
		if (!_tcsicmp (mode, _T("r"))) {
			f = my_opentext (l->name);
			l->textmode = 1;
		} else {
			f = uae_tfopen (l->name, mode);
		}
		if (!f) {
			zfile_fclose (l);
			return 0;
		}
		if (my_stat (l->name, &st))
			l->size = st.size;
		l->f = f;
	}
	return l;
}

static void manglefilename(const TCHAR *in, TCHAR *out, int outsize)
{
	if (!target_expand_environment(in, out, outsize))
		_tcscpy(out, in);
	for (int i = 0; i < _tcslen(out); i++) {
		// remove \\ or // in the middle of path
		if ((out[i] == '/' || out[i] == '\\') && (out[i + 1] == '/' || out[i + 1] == '\\') && i > 0) {
			memmove(out + i, out + i + 1, (_tcslen(out + i) + 1) * sizeof(TCHAR));
			i--;
			continue;
		}
	}
}
int zfile_zopen (const TCHAR *name, zfile_callback zc, void *user)
{
	struct zfile *l;
	int ztype;
	TCHAR path[MAX_DPATH];

	manglefilename (name, path, sizeof path / sizeof(TCHAR));
	l = zfile_fopen_2 (path, _T("rb"), ZFD_NORMAL);
	if (!l)
		return 0;
	ztype = iszip (l);
	if (ztype == 0)
		zc (l, user);
	else
		archive_access_scan (l, zc, user, ztype);
	zfile_fclose (l);
	return 1;
}

/*
* fopen() for a compressed file
*/
static struct zfile *zfile_fopen_x (const TCHAR *name, const TCHAR *mode, int mask, int index)
{
	int cnt = 10;
	struct zfile *l, *l2;
	TCHAR path[MAX_DPATH];

	if (_tcslen (name) == 0)
		return NULL;
	manglefilename(name, path, sizeof(path) / sizeof TCHAR);
	l = zfile_fopen_2 (path, mode, mask);
	if (!l)
		return 0;
	l2 = NULL;
	while (cnt-- > 0) {
		int rc;
		zfile_fseek (l, 0, SEEK_SET);
		l2 = zuncompress (NULL, l, 0, mask, &rc, index);
		if (!l2) {
			if (rc < 0) {
				zfile_fclose (l);
				return NULL;
			}
			zfile_fseek (l, 0, SEEK_SET);
			break;
		} else {
			if (l2->parent == l)
				l->opencnt--;
		}
		l = l2;
	}
	return l;
}

#ifdef _WIN32
static int isinternetfile (const TCHAR *name)
{
	if (!_tcsnicmp (name, _T("http://"), 7) || !_tcsnicmp (name, _T("https://"), 8))
		return 1;
	if (!_tcsnicmp (name, _T("ftp://"), 6))
		return -1;
	return 0;
}
#include <wininet.h>
#include "win32.h"
#define INETBUFFERLEN 1000000
static struct zfile *zfile_fopen_internet (const TCHAR *name, const TCHAR *mode, int mask)
{
	static HINTERNET hi;
	HINTERNET i = NULL;
	TCHAR tmp[MAX_DPATH];
	DWORD ierr = 0;
	DWORD outbuf = sizeof tmp / sizeof (TCHAR);
	uae_u8 *data = 0;
	int bufferlen = INETBUFFERLEN;
	int datalen;
	DWORD didread;
	struct zfile *zf = NULL;

	if (_tcschr (mode, 'w') || _tcschr (mode, 'a'))
		return NULL;
	tmp[0] = 0;
	if (!hi) {
		hi = InternetOpen (WINUAEAPPNAME, INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY, NULL, NULL, 0);
		if (hi == NULL) {
			write_log (_T("InternetOpen() failed, %d\n"), GetLastError ());
			return NULL;
		}
	}
	i = InternetOpenUrl (hi, name, NULL, 0, INTERNET_FLAG_NO_COOKIES, 0);
	if (i == NULL) {
		DWORD err = GetLastError ();
		if (err == ERROR_INTERNET_EXTENDED_ERROR)
			InternetGetLastResponseInfo (&ierr, tmp, &outbuf);
		write_log (_T("InternetOpenUrl(%s) failed %d (%d,%s)\n"), name, err, ierr, tmp);
		goto end;
	}

	if (isinternetfile (name) > 0) {
		DWORD statuscode;
		DWORD hindex = 0;
		DWORD size = sizeof statuscode;
		if (!HttpQueryInfo (i, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &statuscode, &size, &hindex)) {
			DWORD err = GetLastError ();
			write_log (_T("HttpQueryInfo(%s) failed %d\n"), name, err);
			goto end;
		}
		if (statuscode != 200) {
			write_log (_T("HttpQueryInfo(%s)=%d\n"), name, statuscode);
			goto end;
		}
	}

	if (mask & ZFD_CHECKONLY) {
		zf = zfile_create (NULL, name);
		goto end;
	}

	datalen = 0;
	data = xmalloc (uae_u8, bufferlen);
	for (;;) {
		if (!InternetReadFile (i, data + datalen, INETBUFFERLEN, &didread)) {
			DWORD err = GetLastError ();
			if (err == ERROR_INTERNET_EXTENDED_ERROR)
				InternetGetLastResponseInfo (&ierr, tmp, &outbuf);
			write_log (_T("InternetReadFile(%s) failed %d (%d,%s)\n"), name, err, ierr, tmp);
			break;
		}
		if (didread == 0)
			break;
		datalen += didread;
		if (datalen > bufferlen - INETBUFFERLEN) {
			bufferlen += INETBUFFERLEN;
			data = xrealloc (uae_u8, data, bufferlen);
			if (!data) {
				datalen = 0;
				break;
			}
		}
	}
	if (datalen > 0) {
		zf = zfile_create (NULL, name);
		if (zf) {
			zf->size = datalen;
			zf->data = data;
			data = NULL;
		}
	}
end:
	if (i)
		InternetCloseHandle (i);
	free (data);
	return zf;
}
#endif

static struct zfile *zfile_fopenx2 (const TCHAR *name, const TCHAR *mode, int mask, int index)
{
	struct zfile *f;
	TCHAR tmp[MAX_DPATH];

#ifdef _WIN32
	if (isinternetfile (name))
		return zfile_fopen_internet (name, mode, mask);
#endif
	f = zfile_fopen_x (name, mode, mask, index);
	if (f)
		return f;
	if (_tcslen (name) <= 2)
		return NULL;
	if (name[1] != ':') {
		_tcscpy (tmp, start_path_data);
		_tcscat (tmp, name);
		f = zfile_fopen_x (tmp, mode, mask, index);
		if (f)
			return f;
	}
#if 0
	name += 2;
	if (name[0] == '/' || name[0] == '\\')
		name++;
	for (;;) {
		_tcscpy (tmp, start_path_data);
		_tcscpy (tmp, name);
		f = zfile_fopen_x (tmp, mode, mask);
		if (f)
			return f;
		while (name[0]) {
			name++;
			if (name[-1] == '/' || name[-1] == '\\')
				break;
		}
		if (name[0] == 0)
			break;
	}
#endif
	return NULL;
}

static struct zfile *zfile_fopenx (const TCHAR *name, const TCHAR *mode, int mask, int index)
{
	struct zfile *zf;
	//write_log (_T("zfile_fopen('%s','%s',%08x,%d)\n"), name, mode, mask, index);
	zf = zfile_fopenx2 (name, mode, mask, index);
	//write_log (_T("=%p\n"), zf);
	return zf;
}

struct zfile *zfile_fopen (const TCHAR *name, const TCHAR *mode, int mask)
{
	return zfile_fopenx (name, mode, mask, 0);
}
struct zfile *zfile_fopen (const TCHAR *name, const TCHAR *mode)
{
	return zfile_fopenx (name, mode, 0, 0);
}
struct zfile *zfile_fopen (const TCHAR *name, const TCHAR *mode, int mask, int index)
{
	return zfile_fopenx (name, mode, mask, index);
}

struct zfile *zfile_dup (struct zfile *zf)
{
	struct zfile *nzf;
	if (!zf)
		return NULL;
	if (zf->archiveparent)
		checkarchiveparent (zf);
	if (zf->userdata)
		return NULL;
	if (!zf->data && zf->dataseek) {
		nzf = zfile_create (zf, NULL);
	} else if (zf->data) {
		nzf = zfile_create (zf, NULL);
		nzf->data = xmalloc (uae_u8, zf->size);
		if (!nzf->data) {
			write_log(_T("Out of memory: %s\n"), zfile_getname(zf));
			return NULL;
		}
		memcpy (nzf->data, zf->data, zf->size);
		nzf->size = zf->size;
		nzf->datasize = zf->datasize;
	} else if (zf->useparent) {
		nzf = zfile_fopen_parent(zf, zf->name, 0, zf->size);
		return nzf;
	} else {
		if (zf->zipname) {
			nzf = openzip (zf->name);
			if (nzf)
				return nzf;
		}
		if (!zf->name || !zf->mode)
			return NULL;
		FILE *ff = uae_tfopen (zf->name, zf->mode);
		if (!ff)
			return NULL;
		nzf = zfile_create (zf, NULL);
		nzf->f = ff;
	}
	zfile_fseek (nzf, zf->seek, SEEK_SET);
	if (zf->name)
		nzf->name = my_strdup (zf->name);
	if (nzf->zipname)
		nzf->zipname = my_strdup (zf->zipname);
	nzf->zfdmask = zf->zfdmask;
	nzf->mode = my_strdup (zf->mode);
	nzf->size = zf->size;
	return nzf;
}

int zfile_exists (const TCHAR *name)
{
	struct zfile *z;

	if (my_existsfile (name))
		return 1;
	z = zfile_fopen (name, _T("rb"), ZFD_NORMAL | ZFD_CHECKONLY);
	if (!z)
		return 0;
	zfile_fclose (z);
	return 1;
}

int zfile_iscompressed (struct zfile *z)
{
	return z->data ? 1 : 0;
}

struct zfile *zfile_fopen_empty (struct zfile *prev, const TCHAR *name, uae_u64 size)
{
	struct zfile *l;
	l = zfile_create (prev, NULL);
	l->name = my_strdup (name ? name : _T(""));
	if (size) {
		l->data = xcalloc (uae_u8, size);
		if (!l->data)  {
			xfree (l);
			return NULL;
		}
		l->size = size;
		l->datasize = size;
		l->allocsize = size;
	} else {
		l->data = xcalloc (uae_u8, 1000);
		l->size = 0;
		l->allocsize = 1000;
	}
	return l;
}
struct zfile *zfile_fopen_empty (struct zfile *prev, const TCHAR *name)
{
	return zfile_fopen_empty (prev, name, 0);
}

struct zfile *zfile_fopen_parent (struct zfile *z, const TCHAR *name, uae…