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/*
* QEMU ATAPI CD-ROM Emulator
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

/* ??? Most of the ATAPI emulation is still in ide.c. It should be moved
here. */

#include "qemu-common.h"
#include "scsi.h"

static void lba_to_msf(uint8_t *buf, int lba)
{
    lba += 150;
    buf[0] = (lba / 75) / 60;
    buf[1] = (lba / 75) % 60;
    buf[2] = lba % 75;
}

/* same toc as bochs. Return -1 if error or the toc length */
/* XXX: check this */
int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track)
{
    uint8_t *q;
    int len;

    if (start_track > 1 && start_track != 0xaa)
        return -1;
    q = buf + 2;
    *q++ = 1; /* first session */
    *q++ = 1; /* last session */
    if (start_track <= 1) {
        *q++ = 0; /* reserved */
        *q++ = 0x14; /* ADR, control */
        *q++ = 1; /* track number */
        *q++ = 0; /* reserved */
        if (msf) {
            *q++ = 0; /* reserved */
            lba_to_msf(q, 0);
            q += 3;
        } else {
            /* sector 0 */
            cpu_to_be32wu((uint32_t *)q, 0);
            q += 4;
        }
    }
    /* lead out track */
    *q++ = 0; /* reserved */
    *q++ = 0x16; /* ADR, control */
    *q++ = 0xaa; /* track number */
    *q++ = 0; /* reserved */
    if (msf) {
        *q++ = 0; /* reserved */
        lba_to_msf(q, nb_sectors);
        q += 3;
    } else {
        cpu_to_be32wu((uint32_t *)q, nb_sectors);
        q += 4;
    }
    len = q - buf;
    cpu_to_be16wu((uint16_t *)buf, len - 2);
    return len;
}

/* mostly same info as PearPc */
int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, int msf, int session_num)
{
    uint8_t *q;
    int len;

    q = buf + 2;
    *q++ = 1; /* first session */
    *q++ = 1; /* last session */

    *q++ = 1; /* session number */
    *q++ = 0x14; /* data track */
    *q++ = 0; /* track number */
    *q++ = 0xa0; /* lead-in */
    *q++ = 0; /* min */
    *q++ = 0; /* sec */
    *q++ = 0; /* frame */
    *q++ = 0;
    *q++ = 1; /* first track */
    *q++ = 0x00; /* disk type */
    *q++ = 0x00;

    *q++ = 1; /* session number */
    *q++ = 0x14; /* data track */
    *q++ = 0; /* track number */
    *q++ = 0xa1;
    *q++ = 0; /* min */
    *q++ = 0; /* sec */
    *q++ = 0; /* frame */
    *q++ = 0;
    *q++ = 1; /* last track */
    *q++ = 0x00;
    *q++ = 0x00;

    *q++ = 1; /* session number */
    *q++ = 0x14; /* data track */
    *q++ = 0; /* track number */
    *q++ = 0xa2; /* lead-out */
    *q++ = 0; /* min */
    *q++ = 0; /* sec */
    *q++ = 0; /* frame */
    if (msf) {
        *q++ = 0; /* reserved */
        lba_to_msf(q, nb_sectors);
        q += 3;
    } else {
        cpu_to_be32wu((uint32_t *)q, nb_sectors);
        q += 4;
    }

    *q++ = 1; /* session number */
    *q++ = 0x14; /* ADR, control */
    *q++ = 0; /* track number */
    *q++ = 1; /* point */
    *q++ = 0; /* min */
    *q++ = 0; /* sec */
    *q++ = 0; /* frame */
    if (msf) {
        *q++ = 0;
        lba_to_msf(q, 0);
        q += 3;
    } else {
        *q++ = 0;
        *q++ = 0;
        *q++ = 0;
        *q++ = 0;
    }

    len = q - buf;
    cpu_to_be16wu((uint16_t *)buf, len - 2);
    return len;
}
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