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/*********************************************************************

    formats/m20_dsk.c

    Olivetti M20 floppy-disk images

    Track 0/head 0 is FM, 128 byte sectors. The rest is MFM,
    256 byte sectors.
    In image files the sectors of track 0/sector 0 are 256 bytes
    long to simplify access. Only the first half of these sectors
    contain image data.

*********************************************************************/

#include <string.h>

#include "m20_dsk.h"
#include "basicdsk.h"

static FLOPPY_IDENTIFY(m20_dsk_identify)
{
	*vote = (floppy_image_size(floppy) == 286720) ? 100 : 0;
	return FLOPPY_ERROR_SUCCESS;
}

static int m20_get_heads_per_disk(floppy_image_legacy *floppy)
{
	return 2;
}

static int m20_get_tracks_per_disk(floppy_image_legacy *floppy)
{
	return 35;
}

static UINT64 m20_translate_offset(floppy_image_legacy *floppy, int track, int head, int sector)
{
	return 256*(32*track+16*head+sector);
}

static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, UINT64 *offset)
{
	UINT64 offs;
	/* translate the sector to a raw sector */
	if (!sector_is_index)
	{
		sector -= 1;
	}

	/* check to see if we are out of range */
	if ((head < 0) || (head >= 2) || (track < 0) || (track >= 35) || (sector < 0) || (sector >= 16))
		return FLOPPY_ERROR_SEEKERROR;

	offs = m20_translate_offset(floppy, track, head, sector);
	if (offset)
		*offset = offs;
	return FLOPPY_ERROR_SUCCESS;
}



static floperr_t internal_m20_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, void *buffer, size_t buflen)
{
	UINT64 offset;
	floperr_t err;

	//printf("internal_m20_read_sector: track = %d, head = %d, sector = %d, secisix = %d, buflen = %ld\n", track, head, sector, sector_is_index, (long)buflen);
	err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
	if (err)
		return err;

	floppy_image_read(floppy, buffer, offset, buflen);
	return FLOPPY_ERROR_SUCCESS;
}



static floperr_t internal_m20_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, const void *buffer, size_t buflen, int ddam)
{
	UINT64 offset;
	floperr_t err;

	err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
	if (err)
		return err;

	floppy_image_write(floppy, buffer, offset, buflen);
	return FLOPPY_ERROR_SUCCESS;
}



static floperr_t m20_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
	return internal_m20_read_sector(floppy, head, track, sector, FALSE, buffer, buflen);
}

static floperr_t m20_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
	return internal_m20_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam);
}

static floperr_t m20_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
	return internal_m20_read_sector(floppy, head, track, sector, TRUE, buffer, buflen);
}

static floperr_t m20_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
	return internal_m20_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam);
}

static floperr_t m20_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
{
	floperr_t err;
	err = get_offset(floppy, head, track, sector, FALSE, NULL);
	if (err)
		return err;

	if (sector_length) {
		if (track == 0 && head == 0)
			*sector_length = 128;
		else
			*sector_length = 256;
	}
	return FLOPPY_ERROR_SUCCESS;
}



static floperr_t m20_get_indexed_sector_info(floppy_image_legacy *floppy, int head, int track, int sector_index, int *cylinder, int *side, int *sector, UINT32 *sector_length, unsigned long *flags)
{
	sector_index += 1;
	if (cylinder)
		*cylinder = track;
	if (side)
		*side = head;
	if (sector)
		*sector = sector_index;
	if (flags)
		/* TODO: read DAM or DDAM and determine flags */
		*flags = 0;
	return m20_get_sector_length(floppy, head, track, sector_index, sector_length);
}


static FLOPPY_CONSTRUCT(m20_dsk_construct)
{
	struct FloppyCallbacks *callbacks;
	callbacks = floppy_callbacks(floppy);
	callbacks->read_sector = m20_read_sector;
	callbacks->write_sector = m20_write_sector;
	callbacks->read_indexed_sector = m20_read_indexed_sector;
	callbacks->write_indexed_sector = m20_write_indexed_sector;
	callbacks->get_sector_length = m20_get_sector_length;
	callbacks->get_heads_per_disk = m20_get_heads_per_disk;
	callbacks->get_tracks_per_disk = m20_get_tracks_per_disk;
	callbacks->get_indexed_sector_info = m20_get_indexed_sector_info;

	return FLOPPY_ERROR_SUCCESS;
}



/* ----------------------------------------------------------------------- */

LEGACY_FLOPPY_OPTIONS_START( m20 )
	LEGACY_FLOPPY_OPTION(m20_dsk, "img", "M20 disk image", m20_dsk_identify, m20_dsk_construct, NULL, NULL)
LEGACY_FLOPPY_OPTIONS_END


/***************************************************************************

    Copyright Olivier Galibert
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

****************************************************************************/

/*********************************************************************

    formats/m20_dsk.c

    m20 format

*********************************************************************/

#include "emu.h"
#include "formats/m20_dsk.h"

m20_format::m20_format()
{
}

const char *m20_format::name() const
{
	return "m20";
}

const char *m20_format::description() const
{
	return "M20 disk image";
}

const char *m20_format::extensions() const
{
	return "img";
}

bool m20_format::supports_save() const
{
	return false;
}

int m20_format::identify(io_generic *io, UINT32 form_factor)
{
	if(io_generic_size(io) == 286720)
		return 50;
	return 0;
}

bool m20_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
	for(int track = 0; track < 35; track++)
		for(int head = 0; head < 2; head ++) {
			bool mfm = track || head;
			desc_pc_sector sects[16];
			UINT8 sectdata[16*256];
			io_generic_read(io, sectdata, 16*256*(track*2+head), 16*256);
			for(int i=0; i<16; i++) {
				int j = i/2 + (i & 1 ? 0 : 8);
				sects[i].track = track;
				sects[i].head = head;
				sects[i].sector = j+1;
				sects[i].size = mfm ? 1 : 0;
				sects[i].actual_size = mfm ? 256 : 128;
				sects[i].data = sectdata + 256*j;
				sects[i].deleted = false;
				sects[i].bad_crc = false;
			}

			if(mfm)
				build_wd_track_mfm(track, head, image, 100000, 16, sects, 50, 32, 22);
			else
				build_wd_track_fm(track, head, image, 50000, 16, sects, 24, 16, 11);
		}

	return true;
}

bool m20_format::save(io_generic *io, floppy_image *image)
{
	return false;
}

const floppy_format_type FLOPPY_M20_FORMAT = &floppy_image_format_creator<m20_format>;