redquark-amiberry-rb/src/blkdev_cdimage.cpp

/*
* UAE
*
* CD image file support
*
* - iso (2048/2352 block size)
* - cue/bin, cue/bin/wav, cue/bin/mp3
* - ccd/img and ccd/img/sub
*
* Copyright 2010 Toni Wilen
*
*/
#include "sysconfig.h"
#include "sysdeps.h"

#include <sys/timeb.h>

#include "options.h"
#include "blkdev.h"
#include "zfile.h"
#include "gui.h"
#include "fsdb.h"
#include "td-sdl/thread.h"
#include "scsidev.h"
#include "mp3decoder.h"
#include "cda_play.h"
#include "include/memory.h"
#ifdef RETROPLATFORM
#include "rp.h"
#endif

#define FLAC__NO_DLL
#include "FLAC/stream_decoder.h"

#define scsi_log write_log

#define CDDA_BUFFERS 12

enum audenc { AUDENC_NONE, AUDENC_PCM, AUDENC_MP3, AUDENC_FLAC };

struct cdtoc
{
    struct zfile *handle;
    uae_s64 offset;
    uae_u8 *data;
    struct zfile *subhandle;
    int suboffset;
    uae_u8 *subdata;

    uae_s64 filesize;
    TCHAR *fname;
    int address;
    uae_u8 adr, ctrl;
    int track;
    int size;
    int skipsize; // bytes to skip after each block
    audenc enctype;
    int writeoffset;
    int subcode;
};

struct cdunit
{
    bool enabled;
    bool open;
    uae_u8 buffer[2352];
    struct cdtoc toc[102];
    int tracks;
    uae_u64 cdsize;
    int blocksize;

    int cdda_play_state;
    int cdda_play;
    int cdda_paused;
    int cdda_volume[2];
    int cdda_scan;
    int cd_last_pos;
    int cdda_start, cdda_end;
    play_subchannel_callback cdda_subfunc;
    play_status_callback cdda_statusfunc;
    int cdda_delay, cdda_delay_frames;

    int imagechange;
    TCHAR newfile[MAX_DPATH];
    uae_sem_t sub_sem;
    struct device_info di;
};

static struct cdunit cdunits[MAX_TOTAL_SCSI_DEVICES];
static int bus_open;

static volatile int cdimage_unpack_thread, cdimage_unpack_active;
static smp_comm_pipe unpack_pipe;

static struct cdunit *unitisopen (int unitnum)
{
    struct cdunit *cdu = &cdunits[unitnum];
    if (cdu->open)
        return cdu;
    return NULL;
}


static struct cdtoc *findtoc (struct cdunit *cdu, int *sectorp)
{
    int i;
    int sector;

    if (*sectorp < 0)
        return NULL;
    sector = *sectorp;
    for (i = 0; i <= cdu->tracks; i++)
    {
        struct cdtoc *t = &cdu->toc[i];
        if (t->address > sector)
        {
            if (i == 0)
            {
                *sectorp = 0;
                return t;
            }
            t--;
            sector -= t->address;
            *sectorp = sector;
            return t;
        }
    }
    return NULL;
}

// WOHOO, library that supports virtual file access functions. Perfect!
static void flac_metadata_callback (const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    if (t->data)
        return;
    if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
    {
        t->filesize = metadata->data.stream_info.total_samples * (metadata->data.stream_info.bits_per_sample / 8) * metadata->data.stream_info.channels;
    }
}
static void flac_error_callback (const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
{
    return;
}
static FLAC__StreamDecoderWriteStatus flac_write_callback (const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    uae_u16 *p = (uae_u16*)(t->data + t->writeoffset);
    int size = 4;
    for (int i = 0; i < frame->header.blocksize && t->writeoffset < t->filesize - size; i++, t->writeoffset += size)
    {
        *p++ = (FLAC__int16)buffer[0][i];
        *p++ = (FLAC__int16)buffer[1][i];
    }
    return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
static FLAC__StreamDecoderReadStatus file_read_callback (const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    if (zfile_ftell (t->handle) >= zfile_size (t->handle))
        return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
    return zfile_fread (buffer, *bytes, 1, t->handle) ? FLAC__STREAM_DECODER_READ_STATUS_CONTINUE : FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
static FLAC__StreamDecoderSeekStatus file_seek_callback (const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    zfile_fseek (t->handle, absolute_byte_offset, SEEK_SET);
    return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
static FLAC__StreamDecoderTellStatus file_tell_callback (const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    *absolute_byte_offset = zfile_ftell (t->handle);
    return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
static FLAC__StreamDecoderLengthStatus file_len_callback (const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    *stream_length = zfile_size (t->handle);
    return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
static FLAC__bool file_eof_callback (const FLAC__StreamDecoder *decoder, void *client_data)
{
    struct cdtoc *t = (struct cdtoc*)client_data;
    return zfile_ftell (t->handle) >= zfile_size (t->handle);
}

static void flac_get_size (struct cdtoc *t)
{
    FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new ();
    if (decoder)
    {
        FLAC__stream_decoder_set_md5_checking (decoder, false);
        int init_status = FLAC__stream_decoder_init_stream (decoder,
                          &file_read_callback, &file_seek_callback, &file_tell_callback,
                          &file_len_callback, &file_eof_callback,
                          &flac_write_callback, &flac_metadata_callback, &flac_error_callback, t);
        FLAC__stream_decoder_process_until_end_of_metadata (decoder);
        FLAC__stream_decoder_delete (decoder);
    }
}
static uae_u8 *flac_get_data (struct cdtoc *t)
{
    write_log (_T("FLAC: unpacking '%s'..\n"), zfile_getname (t->handle));
    t->writeoffset = 0;
    FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new ();
    if (decoder)
    {
        FLAC__stream_decoder_set_md5_checking (decoder, false);
        int init_status = FLAC__stream_decoder_init_stream (decoder,
                          &file_read_callback, &file_seek_callback, &file_tell_callback,
                          &file_len_callback, &file_eof_callback,
                          &flac_write_callback, &flac_metadata_callback, &flac_error_callback, t);
        FLAC__stream_decoder_process_until_end_of_stream (decoder);
        FLAC__stream_decoder_delete (decoder);
        write_log (_T("FLAC: %s unpacked\n"), zfile_getname (t->handle));
    }
    return t->data;
}

static void sub_to_interleaved (const uae_u8 *s, uae_u8 *d)
{
    for (int i = 0; i < 8 * 12; i ++)
    {
        int dmask = 0x80;
        int smask = 1 << (7 - (i & 7));
        (*d) = 0;
        for (int j = 0; j < 8; j++)
        {
            (*d) |= (s[(i / 8) + j * 12] & smask) ? dmask : 0;
            dmask >>= 1;
        }
        d++;
    }
}
static void sub_to_deinterleaved (const uae_u8 *s, uae_u8 *d)
{
    for (int i = 0; i < 8 * 12; i ++)
    {
        int dmask = 0x80;
        int smask = 1 << (7 - (i / 12));
        (*d) = 0;
        for (int j = 0; j < 8; j++)
        {
            (*d) |= (s[(i % 12) * 8 + j] & smask) ? dmask : 0;
            dmask >>= 1;
        }
        d++;
    }
}

static int getsub_deinterleaved (uae_u8 *dst, struct cdunit *cdu, struct cdtoc *t, int sector)
{
    int ret = 0;
    uae_sem_wait (&cdu->sub_sem);
    if (t->subcode)
    {
        if (t->subhandle)
        {
            int offset = 0;
            int totalsize = SUB_CHANNEL_SIZE;
            if (t->skipsize)
            {
                totalsize += t->size;
                offset = t->size;
            }
            zfile_fseek (t->subhandle, (uae_u64)sector * totalsize + t->suboffset + offset, SEEK_SET);
            if (zfile_fread (dst, SUB_CHANNEL_SIZE, 1, t->subhandle) > 0)
                ret = t->subcode;
        }
        else
        {
            memcpy (dst, t->subdata + sector * SUB_CHANNEL_SIZE + t->suboffset, SUB_CHANNEL_SIZE);
            ret = t->subcode;
        }
    }
    if (!ret)
    {
        memset (dst, 0, SUB_CHANNEL_SIZE);
        // regenerate Q-subchannel
        uae_u8 *s = dst + 12;
        s[0] = (t->ctrl << 4) | (t->adr << 0);
        s[1] = tobcd (t - &cdu->toc[0] + 1);
        s[2] = tobcd (1);
        int msf = lsn2msf (sector);
        tolongbcd (s + 7, msf);
        msf = lsn2msf (sector - t->address - 150);
        tolongbcd (s + 3, msf);
        ret = 2;
    }
    if (ret == 1)
    {
        uae_u8 tmp[SUB_CHANNEL_SIZE];
        memcpy (tmp, dst, SUB_CHANNEL_SIZE);
        sub_to_deinterleaved (tmp, dst);
        ret = 2;
    }
    uae_sem_post (&cdu->sub_sem);
    return ret;
}

static void dosub (struct cdunit *cdu, uae_u8 *subbuf)
{
    uae_u8 subbuf2[SUB_CHANNEL_SIZE];

    if (!cdu->cdda_subfunc)
        return;

    if (!subbuf)
    {
        memset (subbuf2, 0, sizeof subbuf2);
        cdu->cdda_subfunc (subbuf2, 1);
        return;
    }
    sub_to_interleaved (subbuf, subbuf2);
    cdu->cdda_subfunc (subbuf2, 1);
}

static int setstate (struct cdunit *cdu, int state)
{
    cdu->cdda_play_state = state;
    if (cdu->cdda_statusfunc)
        return cdu->cdda_statusfunc (cdu->cdda_play_state);
    return 0;
}

static void *cdda_unpack_func (void *v)
{
    cdimage_unpack_thread = 1;
    mp3decoder *mp3dec = NULL;

    for (;;)
    {
        uae_u32 cduidx = read_comm_pipe_u32_blocking (&unpack_pipe);
        if (cdimage_unpack_thread == 0)
            break;
        uae_u32 tocidx = read_comm_pipe_u32_blocking (&unpack_pipe);
        struct cdunit *cdu = &cdunits[cduidx];
        struct cdtoc *t = &cdu->toc[tocidx];
        if (t->handle)
        {
            // force unpack if handle points to delayed zipped file
            uae_s64 pos = zfile_ftell (t->handle);
            zfile_fseek (t->handle, -1, SEEK_END);
            uae_u8 b;
            zfile_fread (&b, 1, 1, t->handle);
            zfile_fseek (t->handle, pos, SEEK_SET);
            if (!t->data && (t->enctype == AUDENC_MP3 || t->enctype == AUDENC_FLAC))
            {
                t->data = xcalloc (uae_u8, t->filesize + 2352);
                cdimage_unpack_active = 1;
                if (t->data)
                {
                    if (t->enctype == AUDENC_MP3)
                    {
                        if (!mp3dec)
                        {
                            try
                            {
                                mp3dec = new mp3decoder();
                            }
                            catch (exception) { };
                        }
                        if (mp3dec)
                            t->data = mp3dec->get (t->handle, t->data, t->filesize);
                    }
                    else if (t->enctype == AUDENC_FLAC)
                    {
                        flac_get_data (t);
                    }
                }
            }
        }
        cdimage_unpack_active = 2;
    }
    delete mp3dec;
    cdimage_unpack_thread = -1;
    return 0;
}

static void *cdda_play_func (void *v)
{
    int cdda_pos;
    int num_sectors = CDDA_BUFFERS;
    int quit = 0;
    int bufnum;
    int bufon[2];
    int oldplay;
    int idleframes;
    bool foundsub;
    struct cdunit *cdu = (struct cdunit*)v;

    while (cdu->cdda_play == 0)
        Sleep (10);
    oldplay = -1;

    bufon[0] = bufon[1] = 0;
    bufnum = 0;

    cda_audio *cda = new cda_audio (num_sectors);

    while (cdu->cdda_play > 0)
    {

        if (oldplay != cdu->cdda_play)
        {
            struct cdtoc *t;
            int sector, diff;
            struct timeb tb1, tb2;

            idleframes = 0;
            foundsub = false;
            _ftime (&tb1);
            cdda_pos = cdu->cdda_start;
            oldplay = cdu->cdda_play;
            sector = cdu->cd_last_pos = cdda_pos;
            t = findtoc (cdu, &sector);
            if (!t)
            {
                write_log (_T("IMAGE CDDA: illegal sector number %d\n"), cdu->cdda_start);
                setstate (cdu, AUDIO_STATUS_PLAY_ERROR);
            }
            else
            {
                write_log (_T("IMAGE CDDA: playing from %d to %d, track %d ('%s', offset %lld, secoffset %d)\n"),
                           cdu->cdda_start, cdu->cdda_end, t->track, t->fname, t->offset, sector);
                // do this even if audio is not compressed, t->handle also could be
                // compressed and we want to unpack it in background too
                while (cdimage_unpack_active == 1)
                    Sleep (10);
                cdimage_unpack_active = 0;
                write_comm_pipe_u32 (&unpack_pipe, cdu - &cdunits[0], 0);
                write_comm_pipe_u32 (&unpack_pipe, t - &cdu->toc[0], 1);
                while (cdimage_unpack_active == 0)
                    Sleep (10);
            }
            idleframes = cdu->cdda_delay_frames;
            while (cdu->cdda_paused && cdu->cdda_play > 0)
            {
                Sleep (10);
                idleframes = -1;
            }

            if (cdu->cdda_scan == 0)
            {
                // find possible P-subchannel=1 and fudge starting point so that
                // buggy CD32/CDTV software CD+G handling does not miss any frames
                bool seenindex = false;
                for (sector = cdda_pos - 200; sector < cdda_pos; sector++)
                {
                    int sec = sector;
                    t = findtoc (cdu, &sec);
                    if (t)
                    {
                        uae_u8 subbuf[SUB_CHANNEL_SIZE];
                        getsub_deinterleaved (subbuf, cdu, t, sector);
                        if (seenindex)
                        {
                            for (int i = 2 * SUB_ENTRY_SIZE; i < SUB_CHANNEL_SIZE; i++)
                            {
                                if (subbuf[i])   // non-zero R-W subchannels
                                {
                                    int diff = cdda_pos - sector + 2;
                                    write_log (_T("-> CD+G start pos fudge -> %d (%d)\n"), sector, -diff);
                                    idleframes -= diff;
                                    cdda_pos = sector;
                                    break;
                                }
                            }
                        }
                        else if (subbuf[0] == 0xff)     // P == 1?
                        {
                            seenindex = true;
                        }
                    }
                }
            }
            cdda_pos -= idleframes;

            _ftime (&tb2);
            diff = (tb2.time * (uae_s64)1000 + tb2.millitm) - (tb1.time * (uae_s64)1000 + tb1.millitm);
            diff -= cdu->cdda_delay;
            if (idleframes >= 0 && diff < 0 && cdu->cdda_play > 0)
                Sleep (-diff);
            setstate (cdu, AUDIO_STATUS_IN_PROGRESS);
        }

        cda->wait(bufnum);
        bufon[bufnum] = 0;
        if (!cdu->cdda_play)
            goto end;

        if (idleframes <= 0 && cdda_pos >= cdu->cdda_start && !isaudiotrack (&cdu->di.toc, cdda_pos))
        {
            setstate (cdu, AUDIO_STATUS_PLAY_ERROR);
            write_log (_T("IMAGE CDDA: attempted to play data track %d\n"), cdda_pos);
            goto end; // data track?
        }

        if ((cdda_pos < cdu->cdda_end || cdu->cdda_end == 0xffffffff) && !cdu->cdda_paused && cdu->cdda_play > 0)
        {
            struct cdtoc *t;
            int sector, cnt;
            int dofinish = 0;

//			gui_flicker_led (LED_CD, cdu->di.unitnum - 1, LED_CD_AUDIO);

            memset (cda->buffers[bufnum], 0, num_sectors * 2352);

            for (cnt = 0; cnt < num_sectors; cnt++)
            {
                uae_u8 *dst = cda->buffers[bufnum] + cnt * 2352;
                uae_u8 subbuf[SUB_CHANNEL_SIZE];
                sector = cdda_pos;

                memset (subbuf, 0, SUB_CHANNEL_SIZE);

                t = findtoc (cdu, &sector);
                if (t)
                {
                    if (t->handle && !(t->ctrl & 4))
                    {
                        int totalsize = t->size + t->skipsize;
                        if ((t->enctype == AUDENC_MP3 || t->enctype == AUDENC_FLAC) && t->data)
                        {
                            if (t->filesize >= sector * totalsize + t->offset + t->size)
                                memcpy (dst, t->data + sector * totalsize + t->offset, t->size);
                        }
                        else if (t->enctype == AUDENC_PCM)
                        {
                            if (sector * totalsize + t->offset + totalsize < t->filesize)
                            {
                                zfile_fseek (t->handle, (uae_u64)sector * totalsize + t->offset, SEEK_SET);
                                zfile_fread (dst, t->size, 1, t->handle);
                            }
                        }
                    }
                    getsub_deinterleaved (subbuf, cdu, t, cdda_pos);
                }

                if (idleframes > 0)
                {
                    idleframes--;
                    memset (dst, 0, 2352);
                    memset (subbuf, 0, SUB_CHANNEL_SIZE);
                }

                if (cdda_pos < cdu->cdda_start && cdu->cdda_scan == 0)
                    memset (dst, 0, 2352);

                dosub (cdu, subbuf);

                if (cdu->cdda_scan)
                {
                    cdda_pos += cdu->cdda_scan;
                    if (cdda_pos < 0)
                        cdda_pos = 0;
                }
                else
                {
                    cdda_pos++;
                }

                if (cdda_pos - num_sectors < cdu->cdda_end && cdda_pos >= cdu->cdda_end)
                    dofinish = 1;

            }

            if (idleframes <= 0)
                cdu->cd_last_pos = cdda_pos;

            bufon[bufnum] = 1;
            cda->setvolume (currprefs.sound_volume_cd, cdu->cdda_volume[0], cdu->cdda_volume[1]);
            if (!cda->play (bufnum))
            {
                setstate (cdu, AUDIO_STATUS_PLAY_ERROR);
                goto end;
            }

            if (dofinish)
            {
                setstate (cdu, AUDIO_STATUS_PLAY_COMPLETE);
                cdu->cdda_play = -1;
                cdda_pos = cdu->cdda_end + 1;
            }

        }

        if (bufon[0] == 0 && bufon[1] == 0)
        {
            while (cdu->cdda_paused && cdu->cdda_play == oldplay)
                Sleep (10);
        }

        bufnum = 1 - bufnum;
    }

end:
    cda->wait (0);
    cda->wait (1);

    while (cdimage_unpack_active == 1)
        Sleep (10);

    delete cda;

    cdu->cdda_play = 0;
    write_log (_T("IMAGE CDDA: thread killed\n"));
    return NULL;
}


static void cdda_stop (struct cdunit *cdu)
{
    if (cdu->cdda_play != 0)
    {
        cdu->cdda_play = -1;
        while (cdu->cdda_play)
        {
            Sleep (10);
        }
    }
    cdu->cdda_paused = 0;
    cdu->cdda_play_state = 0;
}


static int command_pause (int unitnum, int paused)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return -1;
    int old = cdu->cdda_paused;
    cdu->cdda_paused = paused;
    return old;
}

static int command_stop (int unitnum)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;
    cdda_stop (cdu);
    return 1;
}

static int command_play (int unitnum, int startlsn, int endlsn, int scan, play_status_callback statusfunc, play_subchannel_callback subfunc)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;
    cdu->cd_last_pos = startlsn;
    cdu->cdda_start = startlsn;
    cdu->cdda_end = endlsn;
    cdu->cdda_subfunc = subfunc;
    cdu->cdda_statusfunc = statusfunc;
    cdu->cdda_scan = scan > 0 ? 10 : (scan < 0 ? 10 : 0);
    cdu->cdda_delay = setstate (cdu, -1);
    cdu->cdda_delay_frames = setstate (cdu, -2);
    setstate (cdu, AUDIO_STATUS_NOT_SUPPORTED);
    if (!isaudiotrack (&cdu->di.toc, startlsn))
    {
        setstate (cdu, AUDIO_STATUS_PLAY_ERROR);
        return 0;
    }
    if (!cdu->cdda_play)
        uae_start_thread (_T("cdimage_cdda_play"), cdda_play_func, cdu, NULL);
    cdu->cdda_play++;
    return 1;
}

static int command_qcode (int unitnum, uae_u8 *buf, int sector)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;

    uae_u8 subbuf[SUB_CHANNEL_SIZE];
    uae_u8 *p;
    int trk;
    int pos;
    int status;

    memset (buf, 0, SUBQ_SIZE);
    p = buf;

    status = cdu->cdda_play_state;
    if (cdu->cdda_play > 0 && cdu->cdda_paused)
        status = AUDIO_STATUS_PAUSED;

    if (sector < 0)
        pos = cdu->cd_last_pos;
    else
        pos = sector;

    p[1] = status;
    p[3] = 12;

    p = buf + 4;

    struct cdtoc *td = NULL;
    for (trk = 0; trk <= cdu->tracks; trk++)
    {
        td = &cdu->toc[trk];
        if (pos < td->address)
        {
            if (trk > 0)
                td--;
            break;
        }
        if (pos >= td->address && pos < td[1].address)
            break;
    }
    if (!td)
        return 0;
    getsub_deinterleaved (subbuf, cdu, td, pos);
    memcpy (p, subbuf + 12, 12);
//	write_log (_T("%6d %02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x.%02x\n"),
//		pos, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9], p[10], p[11]);
    return 1;
}

static uae_u32 command_volume (int unitnum, uae_u16 volume_left, uae_u16 volume_right)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return -1;
    uae_u32 old = (cdu->cdda_volume[1] << 16) | (cdu->cdda_volume[0] << 0);
    cdu->cdda_volume[0] = volume_left;
    cdu->cdda_volume[1] = volume_right;
    return old;
}

extern void encode_l2 (uae_u8 *p, int address);

static int command_rawread (int unitnum, uae_u8 *data, int sector, int size, int sectorsize, uae_u32 extra)
{
    int ret = 0;
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;
    int asector = sector;
    struct cdtoc *t = findtoc (cdu, &sector);
    int ssize = t->size + t->skipsize;

    if (!t || t->handle == NULL)
        goto end;

    cdda_stop (cdu);
    if (sectorsize > 0)
    {
        if (sectorsize == 2352 && t->size == 2048)
        {
            // 2048 -> 2352
            while (size-- > 0)
            {
                memset (data, 0, 16);
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize, SEEK_SET);
                zfile_fread (data + 16, t->size, 1, t->handle);
                encode_l2 (data, sector + 150);
                sector++;
                asector++;
                data += sectorsize;
                ret += sectorsize;
            }
        }
        else if (sectorsize == 2048 && t->size == 2352)
        {
            // 2352 -> 2048
            while (size-- > 0)
            {
                uae_u8 b = 0;
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 15, SEEK_SET);
                zfile_fread (&b, 1, 1, t->handle);
                if (b == 2) // MODE2?
                    zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 24, SEEK_SET);
                zfile_fread (data, sectorsize, 1, t->handle);
                sector++;
                asector++;
                data += sectorsize;
                ret += sectorsize;
            }
        }
        else if (sectorsize == 2336 && t->size == 2352)
        {
            // 2352 -> 2336
            while (size-- > 0)
            {
                uae_u8 b = 0;
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 15, SEEK_SET);
                zfile_fread (&b, 1, 1, t->handle);
                if (b != 2 && b != 0) // MODE0 or MODE2 only allowed
                    return 0;
                zfile_fread (data, sectorsize, 1, t->handle);
                sector++;
                asector++;
                data += sectorsize;
                ret += sectorsize;
            }
        }
        else if (sectorsize == t->size)
        {
            // no change
            zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize, SEEK_SET);
            zfile_fread (data, sectorsize, size, t->handle);
            sector += size;
            asector += size;
            ret = size;
        }
        cdu->cd_last_pos = asector;

    }
    else
    {

        uae_u8 sectortype = extra >> 16;
        uae_u8 cmd9 = extra >> 8;
        int sync = (cmd9 >> 7) & 1;
        int headercodes = (cmd9 >> 5) & 3;
        int userdata = (cmd9 >> 4) & 1;
        int edcecc = (cmd9 >> 3) & 1;
        int errorfield = (cmd9 >> 1) & 3;
        uae_u8 subs = extra & 7;
        if (subs != 0 && subs != 1 && subs != 2 && subs != 4)
        {
            ret = -1;
            goto end;
        }

        if (isaudiotrack (&cdu->di.toc, sector))
        {
            if (sectortype != 0 && sectortype != 1)
            {
                ret = -2;
                goto end;
            }
            if (t->size != 2352)
            {
                ret = -1;
                goto end;
            }
            for (int i = 0; i < size; i++)
            {
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize, SEEK_SET);
                zfile_fread (data, t->size, 1, t->handle);
                uae_u8 *p = data + t->size;
                if (subs)
                {
                    uae_u8 subdata[SUB_CHANNEL_SIZE];
                    getsub_deinterleaved (subdata, cdu, t, sector);
                    if (subs == 4)   // all, de-interleaved
                    {
                        memcpy (p, subdata, SUB_CHANNEL_SIZE);
                        p += SUB_CHANNEL_SIZE;
                    }
                    else if (subs == 2)     // q-only
                    {
                        memcpy (p, subdata + SUB_ENTRY_SIZE, SUB_ENTRY_SIZE);
                        p += SUB_ENTRY_SIZE;
                    }
                    else if (subs == 1)     // all, interleaved
                    {
                        sub_to_interleaved (subdata, p);
                        p += SUB_CHANNEL_SIZE;
                    }
                }
                ret += p - data;
                data = p;
                sector++;
            }
        }
    }
end:
    return ret;
}

// this only supports 2048 byte sectors
static int command_read (int unitnum, uae_u8 *data, int sector, int size)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;

    struct cdtoc *t = findtoc (cdu, &sector);
    int ssize = t->size + t->skipsize;

    if (!t || t->handle == NULL)
        return 0;
    cdda_stop (cdu);
    if (t->size == 2048)
    {
        zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize, SEEK_SET);
        zfile_fread (data, size, 2048, t->handle);
        sector += size;
    }
    else
    {
        while (size-- > 0)
        {
            if (t->size == 2352)
            {
                uae_u8 b = 0;
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 15, SEEK_SET);
                zfile_fread (&b, 1, 1, t->handle);
                if (b == 2) // MODE2?
                    zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 24, SEEK_SET);
            }
            else
            {
                zfile_fseek (t->handle, t->offset + (uae_u64)sector * ssize + 16, SEEK_SET);
            }
            zfile_fread (data, 1, 2048, t->handle);
            data += 2048;
            sector++;
        }
    }
    cdu->cd_last_pos = sector;
    return 1;
}

static int command_toc (int unitnum, struct cd_toc_head *th)
{
    struct cdunit *cdu = unitisopen (unitnum);
    if (!cdu)
        return 0;

    int i;

    memset (&cdu->di.toc, 0, sizeof (struct cd_toc_head));
    if (!cdu->tracks)
        return 0;

    memset (th, 0, sizeof (struct cd_toc_head));
    struct cd_toc *toc = &th->toc[0];
    th->first_track = 1;
    th->last_track = cdu->tracks;
    th->points = cdu->tracks + 3;
    th->tracks = cdu->tracks;
    th->firstaddress = 0;
    th->lastaddress = cdu->toc[cdu->tracks].address;

    toc->adr = 1;
    toc->point = 0xa0;
    toc->track = th->first_track;
    toc++;

    th->first_track_offset = 1;
    for (i = 0; i < cdu->tracks; i++)
    {
        toc->adr = cdu->toc[i].adr;
        toc->control = cdu->toc[i].ctrl;
        toc->track = i + 1;
        toc->point = i + 1;
        toc->paddress = cdu->toc[i].address;
        toc++;
    }

    th->last_track_offset = cdu->tracks;
    toc->adr = 1;
    toc->point = 0xa1;
    toc->track = th->last_track;
    toc++;

    toc->adr = 1;
    toc->point = 0xa2;
    toc->paddress = th->lastaddress;
    toc++;

    memcpy (&cdu->di.toc, th, sizeof (struct cd_toc_head));
    return 1;
}

static void skipspace (TCHAR **s)
{
    while (_istspace (**s))
        (*s)++;
}
static void skipnspace (TCHAR **s)
{
    while (!_istspace (**s))
        (*s)++;
}

static TCHAR *nextstring (TCHAR **sp)
{
    TCHAR *s;
    TCHAR *out = NULL;

    skipspace (sp);
    s = *sp;
    if (*s == '\"')
    {
        s++;
        out = s;
        while (*s && *s != '\"')
            s++;
        *s++ = 0;
    }
    else if (*s)
    {
        out = s;
        skipnspace (&s);
        *s++ = 0;
    }
    *sp = s;
    return out;
}

static int readval (const TCHAR *s)
{
    int base = 10;
    TCHAR *endptr;
    if (s[0] == '0' && _totupper (s[1]) == 'X')
        s += 2, base = 16;
    return _tcstol (s, &endptr, base);
}

#define MEDIA_DESCRIPTOR "MEDIA DESCRIPTOR"

/* MDS spec structures from cdemu */

#define MDS_MEDIUM_CD           0x00 /* CD-ROM */
#define MDS_MEDIUM_CD_R         0x01 /* CD-R */
#define MDS_MEDIUM_CD_RW        0x02 /* CD-RW */
#define MDS_MEDIUM_DVD          0x10 /* DVD-ROM */
#define MDS_MEDIUM_DVD_MINUS_R  0x12 /* DVD-R */

#define MDS_TRACKMODE_UNKNOWN       0x00
#define MDS_TRACKMODE_AUDIO         0xA9 /* sector size = 2352 */
#define MDS_TRACKMODE_MODE1         0xAA /* sector size = 2048 */
#define MDS_TRACKMODE_MODE2         0xAB /* sector size = 2336 */
#define MDS_TRACKMODE_MODE2_FORM1   0xAC /* sector size = 2048 */
#define MDS_TRACKMODE_MODE2_FORM2   0xAD /* sector size = 2324 (+4) */

#define MDS_SUBCHAN_NONE            0x00 /* no subchannel */
#define MDS_SUBCHAN_PW_INTERLEAVED  0x08 /* 96-byte PW subchannel, interleaved */

#define MDS_POINT_TRACK_FIRST   0xA0 /* info about first track */
#define MDS_POINT_TRACK_LAST    0xA1 /* info about last track  */
#define MDS_POINT_TRACK_LEADOUT 0xA2 /* info about lead-out    */

#pragma pack(1)

typedef struct
{
    uae_u8 signature[16]; /* "MEDIA DESCRIPTOR" */
    uae_u8 version[2]; /* Version ? */
    uae_u16 medium_type; /* Medium type */
    uae_u16 num_sessions; /* Number of sessions */
    uae_u16 __dummy1__[2]; /* Wish I knew... */
    uae_u16 bca_len; /* Length of BCA data (DVD-ROM) */
    uae_u32 __dummy2__[2];
    uae_u32 bca_data_offset; /* Offset to BCA data (DVD-ROM) */
    uae_u32 __dummy3__[6]; /* Probably more offsets */
    uae_u32 disc_structures_offset; /* Offset to disc structures */
    uae_u32 __dummy4__[3]; /* Probably more offsets */
    uae_u32 sessions_blocks_offset; /* Offset to session blocks */
    uae_u32 dpm_blocks_offset; /* offset to DPM data blocks */
} MDS_Header; /* length: 88 bytes */

typedef struct
{
    uae_s32 session_start; /* Session's start address */
    uae_s32 session_end; /* Session's end address */
    uae_u16 session_number; /* (Unknown) */
    uae_u8 num_all_blocks; /* Number of all data blocks. */
    uae_u8 num_nontrack_blocks; /* Number of lead-in data blocks */
    uae_u16 first_track; /* Total number of sessions in image? */
    uae_u16 last_track; /* Number of regular track data blocks. */
    uae_u32 __dummy2__; /* (unknown) */
    uae_u32 tracks_blocks_offset; /* Offset of lead-in+regular track data blocks. */
} MDS_SessionBlock; /* length: 24 bytes */

typedef struct
{
    uae_u8 mode; /* Track mode */
    uae_u8 subchannel; /* Subchannel mode */
    uae_u8 adr_ctl; /* Adr/Ctl */
    uae_u8 __dummy2__; /* Track flags? */
    uae_u8 point; /* Track number. (>0x99 is lead-in track) */

    uae_u32 __dummy3__;
    uae_u8 min; /* Min */
    uae_u8 sec; /* Sec */
    uae_u8 frame; /* Frame */
    uae_u32 extra_offset; /* Start offset of this track's extra block. */
    uae_u16 sector_size; /* Sector size. */

    uae_u8 __dummy4__[18];
    uae_u32 start_sector; /* Track start sector (PLBA). */
    uae_u64 start_offset; /* Track start offset. */
    uae_u8 session; /* Session or index? */
    uae_u8 __dummy5__[3];
    uae_u32 footer_offset; /* Start offset of footer. */
    uae_u8 __dummy6__[24];
} MDS_TrackBlock; /* length: 80 bytes */

typedef struct
{
    uae_u32 pregap; /* Number of sectors in pregap. */
    uae_u32 length; /* Number of sectors in track. */
} MDS_TrackExtraBlock; /* length: 8 bytes */

typedef struct
{
    uae_u32 filename_offset; /* Start offset of image filename. */
    uae_u32 widechar_filename; /* Seems to be set to 1 if widechar filename is used */
    uae_u32 __dummy1__;
    uae_u32 __dummy2__;
} MDS_Footer; /* length: 16 bytes */

#pragma pack()

static int parsemds (struct cdunit *cdu, struct zfile *zmds, const TCHAR *img)
{
    MDS_Header *head;
    struct cdtoc *t;
    uae_u8 *mds = NULL;
    uae_u64 size;
    MDS_SessionBlock *sb;

    write_log (_T("MDS TOC: '%s'\n"), img);
    size = zfile_size (zmds);
    mds = xmalloc (uae_u8, size);
    if (!mds)
        goto end;
    if (zfile_fread (mds, size, 1, zmds) != 1)
        goto end;

    head = (MDS_Header*)mds;
    if (!memcmp (&head, MEDIA_DESCRIPTOR, strlen (MEDIA_DESCRIPTOR)))
        goto end;
    if (head->version[0] != 1)
    {
        write_log (_T("unsupported MDS version %d, only v.1 supported\n"), head->version[0]);
        goto end;
    }

    sb = (MDS_SessionBlock*)(mds + head->sessions_blocks_offset);
    cdu->tracks = sb->last_track - sb->first_track + 1;
    for (int i = 0; i < sb->num_all_blocks; i++)
    {
        MDS_TrackBlock *tb = (MDS_TrackBlock*)(mds + sb->tracks_blocks_offset + i * sizeof (MDS_TrackBlock));
        int point = tb->point;
        int tracknum = -1;
        if (point == 0xa2)
            tracknum = cdu->tracks;
        else if (point >= 1 && point <= 99)
            tracknum = point - 1;
        if (tracknum >= 0)
        {
            MDS_Footer *footer = tb->footer_offset == 0 ? NULL : (MDS_Footer*)(mds + tb->footer_offset);
            MDS_TrackExtraBlock *teb = tb->extra_offset == 0 ? NULL : (MDS_TrackExtraBlock*)(mds + tb->extra_offset);
            t = &cdu->toc[tracknum];
            t->adr = tb->adr_ctl >> 4;
            t->ctrl = tb->adr_ctl & 15;
            if (point == 0xa2)
                t->address = sb->session_end;
            else
                t->address = tb->start_sector;
            t->track = point;
            t->offset = tb->start_offset;
            t->size = tb->sector_size;

            if (point >= 100)
                continue;

            if (footer)
            {
                TCHAR *fname = NULL;
                if (footer->widechar_filename == 0)
                    fname = au ((char*)(mds + footer->filename_offset));
                else
                    fname = my_strdup ((TCHAR*)(mds + footer->filename_offset));
                if (fname[0] == '*' && fname[1] == '.')
                {
                    TCHAR newname[MAX_DPATH];
                    _tcscpy (newname, img);
                    TCHAR *ext = _tcsrchr (newname, '.');
                    if (ext)
                        _tcscpy (ext, fname + 1);
                    xfree (fname);
                    fname = my_strdup (newname);
                }

                t->handle = zfile_fopen (fname, _T("rb"), ZFD_NORMAL);
                t->fname = my_strdup (fname);
                if (t->handle)
                    t->filesize = zfile_size (t->handle);
            }

            if (tb->subchannel && t->handle)
            {
                t->suboffset = t->size;
                t->subcode = 1; // interleaved
                t->subhandle = zfile_dup (t->handle);
                t->skipsize = SUB_CHANNEL_SIZE;
                t->size -= SUB_CHANNEL_SIZE;
            }
            if ((t->ctrl & 0x0c) != 4)
                t->enctype = AUDENC_PCM;
        }
    }

end:
    xfree (mds);

    return cdu->tracks;
}

static int parseccd (struct cdunit *cdu, struct zfile *zcue, const TCHAR *img)
{
    int mode;
    int num, tracknum, trackmode;
    int adr, control, lba;
    bool gotlba;
    struct cdtoc *t;
    struct zfile *zimg, *zsub;
    TCHAR fname[MAX_DPATH];

    write_log (_T("CCD TOC: '%s'\n"), img);
    _tcscpy (fname, img);
    TCHAR *ext = _tcsrchr (fname, '.');
    if (ext)
        *ext = 0;
    _tcscat (fname, _T(".img"));
    zimg = zfile_fopen (fname, _T("rb"), ZFD_NORMAL);
    if (!zimg)
    {
        write_log (_T("CCD: can't open '%s'\n"), fname);
        return 0;
    }
    ext = _tcsrchr (fname, '.');
    if (ext)
        *ext = 0;
    _tcscat (fname, _T(".sub"));
    zsub = zfile_fopen (fname, _T("rb"), ZFD_NORMAL);
    if (zsub)
        write_log (_T("CCD: '%s' detected\n"), fname);

    num = -1;
    mode = -1;
    for (;;)
    {
        TCHAR buf[MAX_DPATH], *p;
        if (!zfile_fgets (buf, sizeof buf / sizeof (TCHAR), zcue))
            break;
        p = buf;
        skipspace (&p);
        if (!_tcsnicmp (p, _T("[DISC]"), 6))
        {
            mode = 1;
        }
        else if (!_tcsnicmp (p, _T("[ENTRY "), 7))
        {
            t = NULL;
            mode = 2;
            num = readval (p + 7);
            if (num < 0)
                break;
            adr = control = -1;
            gotlba = false;
        }
        else if (!_tcsnicmp (p, _T("[TRACK "), 7))
        {
            mode = 3;
            tracknum = readval (p + 7);
            trackmode = -1;
            if (tracknum <= 0 || tracknum > 99)
                break;
            t = &cdu->toc[tracknum - 1];
        }
        if (mode < 0)
            continue;
        if (mode == 1)
        {
            if (!_tcsnicmp (p, _T("TocEntries="), 11))
            {
                cdu->tracks = readval (p + 11) - 3;
                if (cdu->tracks <= 0 || cdu->tracks > 99)
                    break;
            }
            continue;
        }
        if (cdu->tracks <= 0)
            break;

        if (mode == 2)
        {

            if (!_tcsnicmp (p, _T("SESSION="), 8))
            {
                if (readval (p + 8) != 1)
                    mode = -1;
                continue;
            }
            else if (!_tcsnicmp (p, _T("POINT="), 6))
            {
                tracknum = readval (p + 6);
                if (tracknum <= 0)
                    break;
                if (tracknum >= 0xa0 && tracknum != 0xa2)
                {
                    mode = -1;
                    continue;
                }
                if (tracknum == 0xa2)
                    tracknum = cdu->tracks + 1;
                t = &cdu->toc[tracknum - 1];
                continue;
            }
            if (!_tcsnicmp (p, _T("ADR="), 4))
                adr = readval (p + 4);
            if (!_tcsnicmp (p, _T("CONTROL="), 8))
                control = readval (p + 8);
            if (!_tcsnicmp (p, _T("PLBA="), 5))
            {
                lba = readval (p + 5);
                gotlba = true;
            }
            if (gotlba && adr >= 0 && control >= 0)
            {
                t->adr = adr;
                t->ctrl = control;
                t->address = lba;
                t->offset = 0;
                t->size = 2352;
                t->offset = lba * t->size;
                t->track = tracknum;
                if ((control & 0x0c) != 4)
                    t->enctype = AUDENC_PCM;
                if (zsub)
                {
                    t->subcode = 2;
                    t->subhandle = zfile_dup (zsub);
                    t->suboffset = 0;
                }
                if (zimg)
                {
                    t->handle = zfile_dup (zimg);
                    t->fname = my_strdup (zfile_getname (zimg));
                }
                mode = -1;
            }

        }
        else if (mode == 3)
        {

            if (!_tcsnicmp (p, _T("MODE="), 5))
                trackmode = _tstol (p + 5);
            if (trackmode < 0 || trackmode > 2)
                continue;

        }

    }
    zfile_fclose (zimg);
    zfile_fclose (zsub);
    return cdu->tracks;
}

static int parsecue (struct cdunit *cdu, struct zfile *zcue, const TCHAR *img)
{
    int tracknum, pregap;
    int newfile, secoffset;
    uae_s64 offset, index0;
    TCHAR *fname, *fnametype;
    audenc fnametypeid;
    int ctrl;
    mp3decoder *mp3dec = NULL;

    fname = NULL;
    fnametype = NULL;
    tracknum = 0;
    offset = 0;
    secoffset = 0;
    newfile = 0;
    ctrl = 0;
    index0 = -1;
    pregap = 0;
    fnametypeid = AUDENC_NONE;

    write_log (_T("CUE TOC: '%s'\n"), img);
    for (;;)
    {
        TCHAR buf[MAX_DPATH], *p;
        if (!zfile_fgets (buf, sizeof buf / sizeof (TCHAR), zcue))
            break;

        p = buf;
        skipspace (&p);

        if (!_tcsnicmp (p, _T("FILE"), 4))
        {
            p += 4;
            xfree (fname);
            fname = my_strdup (nextstring (&p));
            fnametype = nextstring (&p);
            fnametypeid = AUDENC_NONE;
            if (!fnametype)
                break;
            if (_tcsicmp (fnametype, _T("BINARY")) && _tcsicmp (fnametype, _T("WAVE")) && _tcsicmp (fnametype, _T("MP3")) && _tcsicmp (fnametype, _T("FLAC")))
            {
                write_log (_T("CUE: unknown file type '%s' ('%s')\n"), fnametype, fname);
            }
            fnametypeid = AUDENC_PCM;
            if (!_tcsicmp (fnametype, _T("MP3")))
                fnametypeid = AUDENC_MP3;
            else if (!_tcsicmp (fnametype, _T("FLAC")))
                fnametypeid = AUDENC_FLAC;
            offset = 0;
            newfile = 1;
            ctrl = 0;
        }
        else if (!_tcsnicmp (p, _T("FLAGS"), 5))
        {
            ctrl &= ~(1 | 2 | 8);
            for (;;)
            {
                TCHAR *f = nextstring (&p);
                if (!f)
                    break;
                if (!_tcsicmp (f, _T("PRE")))
                    ctrl |= 1;
                if (!_tcsicmp (f, _T("DCP")))
                    ctrl |= 2;
                if (!_tcsicmp (f, _T("4CH")))
                    ctrl |= 8;
            }
        }
        else if (!_tcsnicmp (p, _T("TRACK"), 5))
        {
            int size;
            TCHAR *tracktype;

            p += 5;
            //pregap = 0;
            index0 = -1;
            tracknum = _tstoi (nextstring (&p));
            tracktype = nextstring (&p);
            if (!tracktype)
                break;
            size = 2352;
            if (!_tcsicmp (tracktype, _T("AUDIO")))
            {
                ctrl &= ~4;
            }
            else
            {
                ctrl |= 4;
                if (!_tcsicmp (tracktype, _T("MODE1/2048")))
                    size = 2048;
                else if (!_tcsicmp (tracktype, _T("MODE1/2352")))
                    size = 2352;
                else if (!_tcsicmp (tracktype, _T("MODE2/2336")) || !_tcsicmp (tracktype, _T("CDI/2336")))
                    size = 2336;
                else if (!_tcsicmp (tracktype, _T("MODE2/2352")) || !_tcsicmp (tracktype, _T("CDI/2352")))
                    size = 2352;
                else
                {
                    write_log (_T("CUE: unknown tracktype '%s' ('%s')\n"), tracktype, fname);
                }
            }
            if (tracknum >= 1 && tracknum <= 99)
            {
                struct cdtoc *t = &cdu->toc[tracknum - 1];
                struct zfile *ztrack;

                if (tracknum > 1 && newfile)
                {
                    t--;
                    secoffset += (int)(t->filesize / t->size);
                    t++;
                }

                newfile = 0;
                ztrack = zfile_fopen (fname, _T("rb"), ZFD_ARCHIVE | ZFD_DELAYEDOPEN);
                if (!ztrack)
                {
                    TCHAR tmp[MAX_DPATH];
                    _tcscpy (tmp, fname);
                    p = tmp + _tcslen (tmp);
                    while (p > tmp)
                    {
                        if (*p == '/' || *p == '\\')
                        {
                            ztrack = zfile_fopen (p + 1, _T("rb"), ZFD_ARCHIVE | ZFD_DELAYEDOPEN);
                            if (ztrack)
                            {
                                xfree (fname);
                                fname = my_strdup (p + 1);
                            }
                            break;
                        }
                        p--;
                    }
                }
                if (!ztrack)
                {
                    TCHAR tmp[MAX_DPATH];
                    TCHAR *s2;
                    _tcscpy (tmp, zfile_getname (zcue));
                    s2 = _tcsrchr (tmp, '\\');
                    if (!s2)
                        s2 = _tcsrchr (tmp, '/');
                    if (s2)
                    {
                        s2[0] = 0;
                        _tcscat (tmp, FSDB_DIR_SEPARATOR_S);
                        _tcscat (tmp, fname);
                        ztrack = zfile_fopen (tmp, _T("rb"), ZFD_ARCHIVE | ZFD_DELAYEDOPEN);
                    }
                }
                t->track = tracknum;
                t->ctrl = ctrl;
                t->adr = 1;
                t->handle = ztrack;
                t->size = size;
                t->fname = my_strdup (fname);
                if (tracknum > cdu->tracks)
                    cdu->tracks = tracknum;
                if (t->handle)
                    t->filesize = zfile_size (t->handle);
            }
        }
        else if (!_tcsnicmp (p, _T("PREGAP"), 6))
        {
            TCHAR *tt;
            int tn;
            p += 6;
            tt = nextstring (&p);
            tn = _tstoi (tt) * 60 * 75;
            tn += _tstoi (tt + 3) * 75;
            tn += _tstoi (tt + 6);
            pregap += tn;
        }
        else if (!_tcsnicmp (p, _T("INDEX"), 5))
        {
            int idxnum;
            int tn = 0;
            TCHAR *tt;
            p += 5;
            idxnum = _tstoi (nextstring (&p));
            tt = nextstring (&p);
            tn = _tstoi (tt) * 60 * 75;
            tn += _tstoi (tt + 3) * 75;
            tn += _tstoi (tt + 6);
            if (idxnum == 0)
            {
                index0 = tn;
            }
            else if (idxnum == 1 && tracknum >= 1 && tracknum <= 99)
            {
                struct cdtoc *t = &cdu->toc[tracknum - 1];
                if (!t->address)
                {
                    t->address = tn + secoffset;
                    t->address += pregap;
                    if (tracknum > 1)
                    {
                        offset += t->address - t[-1].address;
                    }
                    else
                    {
                        offset += t->address;
                    }
                    if (!secoffset)
                        t->offset = offset * t->size;
                    if (fnametypeid == AUDENC_PCM && t->handle)
                    {
                        struct zfile *zf = t->handle;
                        uae_u8 buf[16] = { 0 };
                        zfile_fread (buf, 12, 1, zf);
                        if (!memcmp (buf, "RIFF", 4) && !memcmp (buf + 8, "WAVE", 4))
                        {
                            int size;
                            for (;;)
                            {
                                memset (buf, 0, sizeof buf);
                                if (zfile_fread (buf, 8, 1, zf) != 1)
                                    break;
                                size = (buf[4] << 0) | (buf[5] << 8) | (buf[6] << 16) | (buf[7] << 24);
                                if (!memcmp (buf, "data", 4))
                                    break;
                                if (size <= 0)
                                    break;
                                zfile_fseek (zf, size, SEEK_CUR);
                            }
                            t->offset += zfile_ftell (zf);
                            t->filesize = size;
                        }
                        t->enctype = fnametypeid;
                    }
                    else if (fnametypeid == AUDENC_MP3 && t->handle)
                    {
                        if (!mp3dec)
                        {
                            try
                            {
                                mp3dec = new mp3decoder();
                            }
                            catch (exception) { }
                        }
                        if (mp3dec)
                        {
                            t->offset = 0;
                            t->filesize = mp3dec->getsize (t->handle);
                            if (t->filesize)
                                t->enctype = fnametypeid;
                        }
                    }
                    else if (fnametypeid == AUDENC_FLAC && t->handle)
                    {
                        flac_get_size (t);
                        if (t->filesize)
                            t->enctype = fnametypeid;
                    }
                }
            }
        }
    }

    struct cdtoc *t = &cdu->toc[cdu->tracks - 1];
    uae_s64 size = t->filesize;
    if (!secoffset)
        size -= offset * t->size;
    if (size < 0)
        size = 0;
    cdu->toc[cdu->tracks].address = t->address + (int)(size / t->size);

    xfree (fname);

    delete mp3dec;

    return cdu->tracks;
}

static int parse_image (struct cdunit *cdu, const TCHAR *img)
{
    struct zfile *zcue;
    int i;
    const TCHAR *ext;
    int secoffset;

    secoffset = 0;
    cdu->tracks = 0;
    if (!img)
        return 0;
    zcue = zfile_fopen (img, _T("rb"), ZFD_ARCHIVE | ZFD_CD | ZFD_DELAYEDOPEN);
    if (!zcue)
        return 0;

    ext = _tcsrchr (zfile_getname (zcue), '.');
    if (ext)
    {
        TCHAR curdir[MAX_DPATH];
        TCHAR oldcurdir[MAX_DPATH], *p;

        ext++;
        oldcurdir[0] = 0;
        _tcscpy (curdir, img);
        p = curdir + _tcslen (curdir);
        while (p > curdir)
        {
            if (*p == '/' || *p == '\\')
                break;
            p--;
        }
        *p = 0;
        if (p > curdir)
            my_setcurrentdir (curdir, oldcurdir);

        if (!_tcsicmp (ext, _T("cue")))
            parsecue (cdu, zcue, img);
        else if (!_tcsicmp (ext, _T("ccd")))
            parseccd (cdu, zcue, img);
        else if (!_tcsicmp (ext, _T("mds")))
            parsemds (cdu, zcue, img);

        if (oldcurdir[0])
            my_setcurrentdir (oldcurdir, NULL);
    }
    if (!cdu->tracks)
    {
        uae_u64 siz = zfile_size (zcue);
        if (siz >= 16384 && ((siz % 2048) == 0 || (siz % 2352) == 0))
        {
            struct cdtoc *t = &cdu->toc[0];
            cdu->tracks = 1;
            t->ctrl = 4;
            t->adr = 1;
            t->fname = my_strdup (img);
            t->handle = zcue;
            t->size = (siz % 2048) == 0 ? 2048 : 2352;
            t->filesize = siz;
            write_log (_T("CD: plain CD image mounted!\n"));
            cdu->toc[1].address = t->address + (int)(t->filesize / t->size);
            zcue = NULL;
        }
    }

    if (!cdu->tracks)
        write_log (_T("CD: couldn't mount '%s'!\n"), img);

    for (i = 0; i <= cdu->tracks; i++)
    {
        struct cdtoc *t = &cdu->toc[i];
        uae_u32 msf = lsn2msf (t->address);
        if (i < cdu->tracks)
            write_log (_T("%2d: "), i + 1);
        else
            write_log (_T("    "));
        write_log (_T("%7d %02d:%02d:%02d"),
                   t->address, (msf >> 16) & 0xff, (msf >> 8) & 0xff, (msf >> 0) & 0xff);
        if (i < cdu->tracks)
            write_log (_T(" %s %x %10lld %10lld %s"), (t->ctrl & 4) ? _T("DATA    ") : (t->subcode ? _T("CDA+SUB") : _T("CDA     ")),
                       t->ctrl, t->offset, t->filesize, t->handle == NULL ? _T("[FILE ERROR]") : _T(""));
        write_log (_T("\n"));
        if (i < cdu->tracks)
            write_log (_T(" - %s\n"), t->fname);
        if (t->handle && !t->filesize)
            t->filesize = zfile_size (t->handle);
    }

    cdu->blocksize = 2048;
    cdu->cdsize = cdu->toc[cdu->tracks].address * cdu->blocksize;


    zfile_fclose (zcue);
    return 1;
}

static int ismedia (int unitnum, int quick)
{
    struct cdunit *cdu = &cdunits[unitnum];
    if (!cdu->enabled)
        return -1;
    return cdu->tracks > 0 ? 1 : 0;
}

static struct device_info *info_device (int unitnum, struct device_info *di, int quick, int session)
{
    struct cdunit *cdu = &cdunits[unitnum];
    memset (di, 0, sizeof (struct device_info));
    if (!cdu->enabled)
        return NULL;
    di->open = cdu->open;
    di->removable = 1;
    di->bus = unitnum;
    di->target = 0;
    di->lun = 0;
    di->media_inserted = 0;
    di->bytespersector = 2048;
    di->mediapath[0] = 0;
    di->cylinders = 1;
    di->trackspercylinder = 1;
    di->sectorspertrack = (int)(cdu->cdsize / di->bytespersector);
    if (ismedia (unitnum, 1))
    {
        di->media_inserted = 1;
        _tcscpy (di->mediapath, currprefs.cdslots[unitnum].name);
    }
    memset (&di->toc, 0, sizeof (struct cd_toc_head));
    command_toc (unitnum, &di->toc);
    di->write_protected = 1;
    di->type = INQ_ROMD;
    di->unitnum = unitnum + 1;
    if (di->mediapath[0])
    {
        _tcscpy (di->label, _T("IMG:"));
        _tcscat (di->label, di->mediapath);
    }
    else
    {
        _tcscpy (di->label, _T("IMG:<EMPTY>"));
    }
    di->backend = _T("IMAGE");
    return di;
}

static void unload_image (struct cdunit *cdu)
{
    int i;

    for (i = 0; i < sizeof cdu->toc / sizeof (struct cdtoc); i++)
    {
        struct cdtoc *t = &cdu->toc[i];
        zfile_fclose (t->handle);
        if (t->handle != t->subhandle)
            zfile_fclose (t->subhandle);
        xfree (t->fname);
        xfree (t->data);
        xfree (t->subdata);
    }
    memset (cdu->toc, 0, sizeof cdu->toc);
    cdu->tracks = 0;
    cdu->cdsize = 0;
}


static int open_device (int unitnum, const TCHAR *ident, int flags)
{
    struct cdunit *cdu = &cdunits[unitnum];
    int ret = 0;

    if (!cdu->open)
    {
        uae_sem_init (&cdu->sub_sem, 0, 1);
        parse_image (cdu, ident);
        cdu->open = true;
        cdu->enabled = true;
        cdu->cdda_volume[0] = 0x7fff;
        cdu->cdda_volume[1] = 0x7fff;
        if (cdimage_unpack_thread == 0)
        {
            init_comm_pipe (&unpack_pipe, 10, 1);
            uae_start_thread (_T("cdimage_unpack"), cdda_unpack_func, NULL, NULL);
            while (cdimage_unpack_thread == 0)
                Sleep (10);
        }
        ret = 1;
    }
    blkdev_cd_change (unitnum, currprefs.cdslots[unitnum].name);
    return ret;
}

static void close_device (int unitnum)
{
    struct cdunit *cdu = &cdunits[unitnum];
    if (cdu->open)
    {
        cdda_stop (cdu);
        cdu->open = false;
        if (cdimage_unpack_thread)
        {
            cdimage_unpack_thread = 0;
            write_comm_pipe_u32 (&unpack_pipe, -1, 0);
            write_comm_pipe_u32 (&unpack_pipe, -1, 1);
            while (cdimage_unpack_thread == 0)
                Sleep (10);
            cdimage_unpack_thread = 0;
            destroy_comm_pipe (&unpack_pipe);
        }
        unload_image (cdu);
        uae_sem_destroy (&cdu->sub_sem);
    }
    blkdev_cd_change (unitnum, currprefs.cdslots[unitnum].name);
}

static void close_bus (void)
{
    if (!bus_open)
    {
        write_log (_T("IMAGE close_bus() when already closed!\n"));
        return;
    }
    for (int i = 0; i < MAX_TOTAL_SCSI_DEVICES; i++)
    {
        struct cdunit *cdu = &cdunits[i];
        if (cdu->open)
            close_device (i);
        cdu->enabled = false;
    }
    bus_open = 0;
    write_log (_T("IMAGE driver closed.\n"));
}

static int open_bus (int flags)
{
    if (bus_open)
    {
        write_log (_T("IOCTL open_bus() more than once!\n"));
        return 1;
    }
    bus_open = 1;
    write_log (_T("Image driver open.\n"));
    return 1;
}

struct device_functions devicefunc_cdimage =
{
    _T("IMAGE"),
    open_bus, close_bus, open_device, close_device, info_device,
    0, 0, 0,
    command_pause, command_stop, command_play, command_volume, command_qcode,
    command_toc, command_read, command_rawread, 0,
    0, ismedia, 0
};