/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#ifdef SDL_CDROM_QNX

/* Functions for system-level CD-ROM audio control */

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#include <errno.h>

#include <unistd.h>

#include <sys/cdrom.h>

#include <sys/dcmd_cam.h>

#include "SDL_timer.h"

#include "SDL_cdrom.h"

#include "../SDL_syscdrom.h"

/* The maximum number of CD-ROM drives we'll detect */

#define MAX_DRIVES 16

#define QNX_CD_OPENMODE O_RDONLY | O_EXCL

/* A list of available CD-ROM drives */

static char *SDL_cdlist[MAX_DRIVES];

static dev_t SDL_cdmode[MAX_DRIVES];

static int   SDL_cdopen[MAX_DRIVES];

/* The system-dependent CD control functions */

static const char *SDL_SYS_CDName(int drive);

static int SDL_SYS_CDOpen(int drive);

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);

static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);

static int SDL_SYS_CDPause(SDL_CD *cdrom);

static int SDL_SYS_CDResume(SDL_CD *cdrom);

static int SDL_SYS_CDStop(SDL_CD *cdrom);

static int SDL_SYS_CDEject(SDL_CD *cdrom);

static void SDL_SYS_CDClose(SDL_CD *cdrom);

/* Check a drive to see if it is a CD-ROM */

static int CheckDrive(char *drive, struct stat *stbuf)

{

    int is_cd, cdfd;

    cam_devinfo_t dinfo;

    int devctlret=0;

    int atapi;

    int removable;

    int cdb10;

    /* If it doesn't exist, return -1 */

    if (stat(drive, stbuf) < 0)

    {

        return(-1);

    }

    /* If it does exist, verify that it's an available CD-ROM */

    is_cd = 0;

    if (S_ISCHR(stbuf->st_mode) || S_ISBLK(stbuf->st_mode))

    {

        cdfd = open(drive, QNX_CD_OPENMODE);

        if ( cdfd >= 0 )

        {

            devctlret=devctl(cdfd, DCMD_CAM_DEVINFO, &dinfo, sizeof(cam_devinfo_t), NULL);

            if (devctlret==EOK)

            {

               atapi=dinfo.flags & DEV_ATAPI;

               removable=dinfo.flags & DEV_REMOVABLE;

               cdb10=dinfo.flags & DEV_CDB_10; /* I'm not sure about that flag */

               /* in the near future need to add more checks for splitting cdroms from other devices */

               if ((atapi)&&(removable))

               {

                   is_cd = 1;

               }

            }

            close(cdfd);

        }

    }

    return(is_cd);

}

/* Add a CD-ROM drive to our list of valid drives */

static void AddDrive(char *drive, struct stat *stbuf)

{

    int i;

    if (SDL_numcds < MAX_DRIVES)

    {

        /* Check to make sure it's not already in our list.

        This can happen when we see a drive via symbolic link. */

        for (i=0; i<SDL_numcds; ++i)

        {

            if (stbuf->st_rdev == SDL_cdmode[i])

            {

                return;

            }

        }

        /* Add this drive to our list */

        i = SDL_numcds;

        SDL_cdlist[i] = SDL_strdup(drive);

        if (SDL_cdlist[i] == NULL)

        {

            SDL_OutOfMemory();

            return;

        }

        SDL_cdmode[i] = stbuf->st_rdev;

        ++SDL_numcds;

    }

}

int SDL_SYS_CDInit(void)

{

    /* checklist: /dev/cdrom, /dev/cd?, /dev/scd? */

    static char *checklist[]={"cdrom", "?0 cd?", "?1 cd?", "?0 scd?", NULL};

    char *SDLcdrom;

    int i, j, exists;

    char drive[32];

    struct stat stbuf;

    /* Fill in our driver capabilities */

    SDL_CDcaps.Name = SDL_SYS_CDName;

    SDL_CDcaps.Open = SDL_SYS_CDOpen;

    SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;

    SDL_CDcaps.Status = SDL_SYS_CDStatus;

    SDL_CDcaps.Play = SDL_SYS_CDPlay;

    SDL_CDcaps.Pause = SDL_SYS_CDPause;

    SDL_CDcaps.Resume = SDL_SYS_CDResume;

    SDL_CDcaps.Stop = SDL_SYS_CDStop;

    SDL_CDcaps.Eject = SDL_SYS_CDEject;

    SDL_CDcaps.Close = SDL_SYS_CDClose;

    /* clearing device open status */

    for (i=0; i<MAX_DRIVES; i++)

    {

       SDL_cdopen[i]=0;

    }

    /* Look in the environment for our CD-ROM drive list */

    SDLcdrom = SDL_getenv("SDL_CDROM");	/* ':' separated list of devices */

    if ( SDLcdrom != NULL )

    {

        char *cdpath, *delim;

	size_t len = SDL_strlen(SDLcdrom)+1;

        cdpath = SDL_stack_alloc(char, len);

        if (cdpath != NULL)

        {

            SDL_strlcpy(cdpath, SDLcdrom, len);

            SDLcdrom = cdpath;

            do {

                delim = SDL_strchr(SDLcdrom, ':');

                if (delim)

                {

                    *delim++ = '\0';

                }

                if (CheckDrive(SDLcdrom, &stbuf) > 0)

                {

                    AddDrive(SDLcdrom, &stbuf);

                }

                if (delim)

                {

                    SDLcdrom = delim;

                }

                else

                {

                    SDLcdrom = NULL;

                }

            } while (SDLcdrom);

            SDL_stack_free(cdpath);

        }

        /* If we found our drives, there's nothing left to do */

        if (SDL_numcds > 0)

        {

            return(0);

        }

    }

    /* Scan the system for CD-ROM drives */

    for ( i=0; checklist[i]; ++i )

    {

        if (checklist[i][0] == '?')

        {

            char* insert;

            exists = 1;

            for ( j=checklist[i][1]; exists; ++j )

            {

                SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", &checklist[i][3]);

                insert = SDL_strchr(drive, '?');

                if (insert != NULL)

                {

                    *insert = j;

                }

                switch (CheckDrive(drive, &stbuf))

                {

                    /* Drive exists and is a CD-ROM */

                    case 1:

                             AddDrive(drive, &stbuf);

                             break;

                    /* Drive exists, but isn't a CD-ROM */

                    case 0:

                             break;

                    /* Drive doesn't exist */

                    case -1:

                             exists = 0;

                             break;

                }

            }

        }

        else

        {

            SDL_snprintf(drive, SDL_arraysize(drive), "/dev/%s", checklist[i]);

            if (CheckDrive(drive, &stbuf) > 0)

            {

                AddDrive(drive, &stbuf);

            }

        }

    }

    return(0);

}

static const char *SDL_SYS_CDName(int drive)

{

    return(SDL_cdlist[drive]);

}

static int SDL_SYS_CDOpen(int drive)

{

    int handle;

    handle=open(SDL_cdlist[drive], QNX_CD_OPENMODE);

    if (handle>0)

    {

        SDL_cdopen[drive]=handle;

    }

    return (handle);

}

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)

{

    cdrom_read_toc_t toc;

    int i, okay;

    okay = 0;

    if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), NULL) == 0)

    {

        cdrom->numtracks = toc.last_track - toc.first_track + 1;

        if (cdrom->numtracks > SDL_MAX_TRACKS)

        {

            cdrom->numtracks = SDL_MAX_TRACKS;

        }

        /* Read all the track TOC entries */

        for (i=0; i<=cdrom->numtracks; ++i)

        {

            if (i == cdrom->numtracks)

            {

                cdrom->track[i].id = CDROM_LEADOUT;

            }

            else

            {

                cdrom->track[i].id = toc.first_track+i;

            }

            cdrom->track[i].type = toc.toc_entry[i].control_adr & 0x0F;

            cdrom->track[i].offset = toc.toc_entry[i].addr.lba;

            cdrom->track[i].length = 0;

            if (i > 0)

            {

                 cdrom->track[i-1].length = cdrom->track[i].offset-cdrom->track[i-1].offset;

            }

        }

        if (i == (cdrom->numtracks+1))

        {

            okay = 1;

        }

    }

    return (okay ? 0 : -1);

}

/* Get CD-ROM status */

static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)

{

    CDstatus status;

    cdrom_read_toc_t toc;

    cdrom_subch_data_t info;

    cam_devinfo_t dinfo;

    int devctlret=0;

    int drive=-1;

    int i;

    int eagaincnt=0;

    /* check media presence before read subchannel call, some cdroms can lockups */

    /* if no media, while calling read subchannel functions.                     */

    devctlret=devctl(cdrom->id, DCMD_CAM_DEVINFO, &dinfo, sizeof(cam_devinfo_t), NULL);

    if (devctlret==EOK)

    {

        if ((dinfo.flags & DEV_NO_MEDIA)!=0)

        {

            status = CD_TRAYEMPTY;

            if (position)

            {

                *position = 0;

            }

            return (status);

        }

    }

    /* if media exists, then do other stuff */

    SDL_memset(&info, 0x00, sizeof(info));

    info.subch_command.data_format = CDROM_SUBCH_CURRENT_POSITION;

    do {

        devctlret=devctl(cdrom->id, DCMD_CAM_CDROMSUBCHNL, &info, sizeof(info), NULL);

        if (devctlret==EIO)

        {

            /* big workaround for media change, handle is unusable after that,

               that bug was found in QNX 6.2, 6.2.1 is not released yet.    */

            for (i=0; i<MAX_DRIVES; i++)

            {

                if (SDL_cdopen[i]==cdrom->id)

                {

                    drive=i;

                    break;

                }

            }

            if (drive==-1)

            {

               /* that cannot happen, but ... */

               break;

            }

            close(cdrom->id);

            cdrom->id=open(SDL_cdlist[drive], QNX_CD_OPENMODE);

            devctlret=EAGAIN;

        }

        if (devctlret==EAGAIN)

        {

            eagaincnt++;

        }

        if (eagaincnt==2)

        {

            /* workaround for broken cdroms, which can return always EAGAIN when its not ready, */

            /* that mean errornous media or just no media avail                                 */

            devctlret=ENXIO;

            break;

        }

    } while ((devctlret==EAGAIN)||(devctlret==ESTALE));

    if (devctlret != 0)

    {

        if (devctlret==ENXIO)

        {

            status = CD_TRAYEMPTY;

        }

        else

        {

            status = CD_ERROR;

        }

    }

    else

    {

        switch (info.current_position.header.audio_status)

        {

            case CDROM_AUDIO_INVALID:

            case CDROM_AUDIO_NO_STATUS:

                 /* Try to determine if there's a CD available */

                 if (devctl(cdrom->id, DCMD_CAM_CDROMREADTOC, &toc, sizeof(toc), NULL)==0)

                     status = CD_STOPPED;

                 else

                     status = CD_TRAYEMPTY;

                 break;

            case CDROM_AUDIO_COMPLETED:

                 status = CD_STOPPED;

                 break;

            case CDROM_AUDIO_PLAY:

                 status = CD_PLAYING;

                 break;

            case CDROM_AUDIO_PAUSED:

                 /* Workaround buggy CD-ROM drive */

                 if (info.current_position.data_format == CDROM_LEADOUT)

                 {

                     status = CD_STOPPED;

                 }

                 else

                 {

                     status = CD_PAUSED;

                 }

                 break;

            default:

                 status = CD_ERROR;

                 break;

        }

    }

    if (position)

    {

       if (status==CD_PLAYING || (status==CD_PAUSED))

       {

           *position = MSF_TO_FRAMES(info.current_position.addr.msf.minute,

                                     info.current_position.addr.msf.second,

                                     info.current_position.addr.msf.frame);

       }

       else

       {

           *position = 0;

       }

    }

    return (status);

}

/* Start play */

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)

{

    cdrom_playmsf_t playtime;

    FRAMES_TO_MSF(start, &playtime.start_minute, &playtime.start_second, &playtime.start_frame);

    FRAMES_TO_MSF(start+length, &playtime.end_minute, &playtime.end_second, &playtime.end_frame);

    if (devctl(cdrom->id, DCMD_CAM_CDROMPLAYMSF, &playtime, sizeof(playtime), NULL) != 0)

    {

       return -1;

    }

    else

    {

       return 0;

    }

}

/* Pause play */

static int SDL_SYS_CDPause(SDL_CD *cdrom)

{

    if (devctl(cdrom->id, DCMD_CAM_CDROMPAUSE, NULL, 0, NULL)!=0)

    {

       return -1;

    }

    else

    {

       return 0;

    }

}

/* Resume play */

static int SDL_SYS_CDResume(SDL_CD *cdrom)

{

    if (devctl(cdrom->id, DCMD_CAM_CDROMRESUME, NULL, 0, NULL)!=0)

    {

       return -1;

    }

    else

    {

       return 0;

    }

}

/* Stop play */

static int SDL_SYS_CDStop(SDL_CD *cdrom)

{

    if (devctl(cdrom->id, DCMD_CAM_CDROMSTOP, NULL, 0, NULL)!=0)

    {

       return -1;

    }

    else

    {

       return 0;

    }

}

/* Eject the CD-ROM */

static int SDL_SYS_CDEject(SDL_CD *cdrom)

{

    if (devctl(cdrom->id, DCMD_CAM_EJECT_MEDIA, NULL, 0, NULL)!=0)

    {

       return -1;

    }

    else

    {

       return 0;

    }

}

/* Close the CD-ROM handle */

static void SDL_SYS_CDClose(SDL_CD *cdrom)

{

    int i;

    for (i=0; i<MAX_DRIVES; i++)

    {

       if (SDL_cdopen[i]==cdrom->id)

       {