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

    formats/comx35_dsk.c

    COMX35 disk images

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

#include "formats/comx35_dsk.h"
#include "formats/basicdsk.h"

/***************************************************************************
    IMPLEMENTATION
***************************************************************************/

/*-------------------------------------------------
    FLOPPY_IDENTIFY( comx35_dsk_identify )
-------------------------------------------------*/

static FLOPPY_IDENTIFY( comx35_dsk_identify )
{
	*vote = ((floppy_image_size(floppy) == (35*1*16*128)) || (floppy_image_size(floppy) == (35*2*16*128))) ? 100 : 0;

	return FLOPPY_ERROR_SUCCESS;
}

/*-------------------------------------------------
    FLOPPY_CONSTRUCT( comx35_dsk_construct )
-------------------------------------------------*/

static FLOPPY_CONSTRUCT( comx35_dsk_construct )
{
	UINT8 header[1];
	int heads = 1;
	int cylinders = 35;

	switch (floppy_image_size(floppy))
	{
	case 35*1*16*128:
		heads = 1;
		cylinders = 35;
		break;

	case 35*2*16*128:
		floppy_image_read(floppy, header, 0x12, 1);

		if (header[0] == 0x01)
		{
			heads = 1;
			cylinders = 70;
		}
		else
		{
			heads = 2;
			cylinders = 35;
		}
		break;
	}

	struct basicdsk_geometry geometry;
	memset(&geometry, 0, sizeof(geometry));

	geometry.heads = heads;
	geometry.first_sector_id = 0;
	geometry.sector_length = 128;
	geometry.tracks = cylinders;
	geometry.sectors = 16;

	return basicdsk_construct(floppy, &geometry);
}

/*-------------------------------------------------
    FLOPPY_OPTIONS( comx35 )
-------------------------------------------------*/

LEGACY_FLOPPY_OPTIONS_START( comx35 )
	LEGACY_FLOPPY_OPTION( comx35, "img", "COMX35 floppy disk image", comx35_dsk_identify, comx35_dsk_construct, NULL, NULL )
LEGACY_FLOPPY_OPTIONS_END