86Box/src/cdrom/cdrom_null.c

/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		Implementation of the CD-ROM null interface for unmounted
 *		guest CD-ROM drives.
 *
 * Version:	@(#)cdrom_null.c	1.0.7	2018/03/26
 *
 * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *
 *		Copyright 2008-2016 Sarah Walker.
 *		Copyright 2016-2018 Miran Grca.
 */
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <wchar.h>
#include "../86box.h"
#include "../scsi/scsi.h"
#include "cdrom.h"


static CDROM null_cdrom;


static int
null_ready(uint8_t id)
{
    return(0);
}


/* Always return 0, the contents of a null CD-ROM drive never change. */
static int
null_medium_changed(uint8_t id)
{
    return(0);
}


static uint8_t
null_getcurrentsubchannel(uint8_t id, uint8_t *b, int msf)
{
    return(0x13);
}


static int
null_readsector_raw(uint8_t id, uint8_t *buffer, int sector, int ismsf, int cdrom_sector_type, int cdrom_sector_flags, int *len)
{
    *len = 0;

    return(0);
}


static int
null_readtoc(uint8_t id, uint8_t *b, uint8_t starttrack, int msf, int maxlen, int single)
{
    return(0);
}


static int
null_readtoc_session(uint8_t id, uint8_t *b, int msf, int maxlen)
{
    return(0);
}


static int
null_readtoc_raw(uint8_t id, uint8_t *b, int maxlen)
{
    return(0);
}


static uint32_t
null_size(uint8_t id)
{
    return(0);
}


static int
null_status(uint8_t id)
{
    return(CD_STATUS_EMPTY);
}


void
cdrom_null_reset(uint8_t id)
{
}


void cdrom_set_null_handler(uint8_t id);

int
cdrom_null_open(uint8_t id)
{
    cdrom_set_null_handler(id);

    return(0);
}


void
null_close(uint8_t id)
{
}


static
void null_exit(uint8_t id)
{
}


static int
null_media_type_id(uint8_t id)
{
    return(0x70);
}


void
cdrom_set_null_handler(uint8_t id)
{
    cdrom[id]->handler = &null_cdrom;
    cdrom_drives[id].host_drive = 0;
    memset(cdrom_image[id].image_path, 0, sizeof(cdrom_image[id].image_path));
}


static CDROM null_cdrom = {
    null_ready,
    null_medium_changed,
    null_media_type_id,
    NULL,
    NULL,
    null_readtoc,
    null_readtoc_session,
    null_readtoc_raw,
    null_getcurrentsubchannel,
    null_readsector_raw,
    NULL,
    NULL,
    NULL,
    null_size,
    null_status,
    NULL,
    null_exit
};