/**

 * $Id: gdrom.h,v 1.8 2006-12-14 12:31:38 nkeynes Exp $

 *

 * This file defines the structures and functions used by the GD-Rom

 * disc driver. (ie, the modules that supply a CD image to be used by the

 * system).

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#ifndef dream_gdrom_H

#define dream_gdrom_H 1

#include "dream.h"

typedef uint16_t gdrom_error_t;

struct gdrom_toc {

    uint32_t track[99];

    uint32_t first, last, leadout;

};

#define GDROM_PREGAP 150  /* Sectors */

extern uint32_t gdrom_sector_size[];

#define GDROM_SECTOR_SIZE(x) gdrom_sector_size[x]

typedef enum {

    GDROM_MODE1,

    GDROM_MODE2,

    GDROM_MODE2_XA1,

    GDROM_MODE2_XA2,

    GDROM_CDDA,

    GDROM_GD,

    GDROM_RAW

} gdrom_track_mode_t;

/* The disc register indicates the current contents of the drive. When open

 * contains 0x06.

 */

#define IDE_DISC_AUDIO 0x00

#define IDE_DISC_NONE  0x06

#define IDE_DISC_CDROM 0x20

#define IDE_DISC_GDROM 0x80

#define IDE_DISC_READY 0x01 /* ored with above */

#define IDE_DISC_IDLE  0x02 /* ie spun-down */

#define TRACK_PRE_EMPHASIS   0x10

#define TRACK_COPY_PERMITTED 0x20

#define TRACK_DATA           0x40

#define TRACK_FOUR_CHANNEL   0x80

struct gdrom_track {

    gdrom_track_mode_t mode;

    uint8_t flags;        /* Track flags */

    int      session;     /* session # containing this track */

    uint32_t lba;         /* start sector address */

    uint32_t sector_size; /* For convenience, determined by mode */

    uint32_t sector_count;

    uint32_t offset; /* File offset of start of track - image files only */

};

typedef struct gdrom_disc {

    int disc_type;

    int track_count;

    struct gdrom_track track[99];

    gchar mcn[14]; /* Media catalogue number */

    const gchar *filename; /* Image filename */

    FILE *file; /* Stream, for image files */

    gdrom_error_t (*read_sectors)( struct gdrom_disc *disc,

			      uint32_t lba, uint32_t sector_count,

			      int mode, char *buf, uint32_t *length );

    void (*close)( struct gdrom_disc *disc );

} *gdrom_disc_t;

/**

 *

 */

typedef struct gdrom_image_class {

    const gchar *name;

    const gchar *extension;

    gboolean (*is_valid_file)(FILE *f);

    gdrom_disc_t (*open_image_file)(const gchar *filename, FILE *f);

} *gdrom_image_class_t;

extern struct gdrom_image_class nrg_image_class;

extern struct gdrom_image_class cdi_image_class;

extern struct gdrom_image_class linux_device_class;

/**

 * Construct a new image file using the default methods.

 */

gdrom_disc_t gdrom_image_new( FILE *file );

/**

 * Open an image file

 */

gdrom_disc_t gdrom_image_open( const gchar *filename );

/**

 * Retrieve the disc table of contents, and write it into the buffer in the 

 * format expected by the DC.

 * @return 0 on success, error code on failure (eg no disc mounted)

 */

gdrom_error_t gdrom_get_toc( char *buf );

/**

 * Retrieve the short (6-byte) session info, and write it into the buffer.

 * @return 0 on success, error code on failure.

 */

gdrom_error_t gdrom_get_info( char *buf, int session );

/**

 * Shortcut to open and mount an image file

 */

gdrom_disc_t gdrom_mount_image( const gchar *filename );

void gdrom_mount_disc( gdrom_disc_t disc );

void gdrom_unmount_disc( void );

gboolean gdrom_is_mounted( void );

uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,

			     int mode, char *buf, uint32_t *length );

#endif