libburn/libburn/mmc.c

/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */

/* ts A61009 */
/* #include <a ssert.h> */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include "error.h"
#include "sector.h"
#include "libburn.h"
#include "transport.h"
#include "mmc.h"
#include "spc.h"
#include "drive.h"
#include "debug.h"
#include "toc.h"
#include "structure.h"
#include "options.h"


/* ts A70223 : in init.c */
extern int burn_support_untested_profiles;


#ifdef Libburn_log_in_and_out_streaM
/* <<< ts A61031 */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif /* Libburn_log_in_and_out_streaM */


/* ts A61005 */
#include "libdax_msgs.h"
extern struct libdax_msgs *libdax_messenger;


/* ts A61219 : Based on knowlege from dvd+rw-tools-7.0 and mmc5r03c.pdf */
#define Libburn_support_dvd_plus_rW 1

/* ts A61229 */
#define Libburn_support_dvd_minusrw_overW 1

/* ts A70112 */
#define Libburn_support_dvd_raM 1

/* ts A70129 */
#define Libburn_support_dvd_r_seQ 1

/* ts A70306 */
#define Libburn_support_dvd_plus_R 1

/* DVD progress report:
   ts A61219 : It seems to work with a used (i.e. thoroughly formatted) DVD+RW.
               Error messages of class DEBUG appear because of inability to
               read TOC or track info. Nevertheless, the written images verify.
   ts A61220 : Burned to a virgin DVD+RW by help of new mmc_format_unit()
               (did not test wether it would work without). Burned to a
               not completely formatted DVD+RW. (Had worked before without
               mmc_format_unit() but i did not exceed the formatted range
               as reported by dvd+rw-mediainfo.) 
   ts A61221 : Speed setting now works for both of my drives. The according
               functions in dvd+rw-tools are a bit intimidating to the reader.
               I hope it is possible to leave much of this to the drive. 
               And if it fails ... well, it's only speed setting. :))
   ts A61229 : Burned to several DVD-RW formatted to mode Restricted Overwrite
               by dvd+rw-format. Needs Libburn_support_dvd_minusrw_overW.
   ts A61230 : Other than growisofs, libburn does not send a mode page 5 for
               such DVD-RW (which the MMC-5 standard does deprecate) and it
               really seems to work without such a page.
   ts A70101 : Formatted DVD-RW media. Success is varying with media, but
               dvd+rw-format does not do better with the same media.
   ts A70112 : Support for writing to DVD-RAM.
   ts A70130 : Burned a first non-multi sequential DVD-RW. Feature 0021h
               Incremental Recording vanishes after that and media thus gets
               not recognized as suitable any more.
               After a run with -multi another disc still offers 0021h .
               dvd+rw-mediainfo shows two tracks. The second, an afio archive
               is readable by afio. Third and forth veryfy too. Suddenly
               dvd+rw-mediainfo sees lba 0 with track 2. But #2 still verifies
               if one knows its address.
   ts A70203 : DVD-RW need to get blanked fully. Then feature 0021h persists.
               Meanwhile Incremental streaming is supported like CD TAO:
               with unpredicted size, multi-track, multi-session.
   ts A70205 : Beginning to implement DVD-R[W] DAO : single track and session,
               size prediction mandatory.
   ts A70208 : Finally made tests with DVD-R. Worked exactly as new DVD-RW.
   ts A70306 : Implemented DVD+R (always -multi for now)
   ts A70330 : Allowed finalizing of DVD+R.
*/

/* ts A70519 : With MMC commands of data direction FROM_DRIVE:
               Made struct command.dxfer_len equal to Allocation Length
               of MMC commands. Made sure that not more bytes are allowed
               for transfer than there are available. 
*/

static unsigned char MMC_GET_MSINFO[] =
	{ 0x43, 0, 1, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_TOC[] = { 0x43, 2, 2, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_ATIP[] = { 0x43, 2, 4, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_DISC_INFO[] =
	{ 0x51, 0, 0, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_READ_CD[] = { 0xBE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_BLANK[] = { 0xA1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_SEND_OPC[] = { 0x54, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_SET_SPEED[] =
	{ 0xBB, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_WRITE_12[] =
	{ 0xAA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_WRITE_10[] = { 0x2A, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

/* ts A61201 : inserted 0, before 16, */
static unsigned char MMC_GET_CONFIGURATION[] =
	{ 0x46, 0, 0, 0, 0, 0, 0, 16, 0, 0 };

static unsigned char MMC_SYNC_CACHE[] = { 0x35, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_GET_EVENT[] = { 0x4A, 1, 0, 0, 16, 0, 0, 0, 8, 0 };
static unsigned char MMC_CLOSE[] = { 0x5B, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static unsigned char MMC_TRACK_INFO[] = { 0x52, 0, 0, 0, 0, 0, 0, 16, 0, 0 };

static unsigned char MMC_SEND_CUE_SHEET[] =
	{ 0x5D, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

/* ts A61023 : get size and free space of drive buffer */
static unsigned char MMC_READ_BUFFER_CAPACITY[] =
	{ 0x5C, 0, 0, 0, 0, 0, 0, 16, 0, 0 };

/* ts A61219 : format DVD+RW (and various others) */
static unsigned char MMC_FORMAT_UNIT[] = { 0x04, 0x11, 0, 0, 0, 0 };

/* ts A61221 :
   To set speed for DVD media (0xBB is for CD but works on my LG GSA drive) */
static unsigned char MMC_SET_STREAMING[] =
	{ 0xB6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

/* ts A61225 :
   To obtain write speed descriptors (command can do other things too) */
static unsigned char MMC_GET_PERFORMANCE[] =
	{ 0xAC, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

/* ts A70108 : To obtain info about drive and media formatting opportunities */
static unsigned char MMC_READ_FORMAT_CAPACITIES[] =
	{ 0x23, 0, 0, 0, 0, 0, 0, 0, 0, 0};

/* ts A70205 : To describe the layout of a DVD-R[W] DAO session */
static unsigned char MMC_RESERVE_TRACK[] =
	{ 0x53, 0, 0, 0, 0, 0, 0, 0, 0, 0};


static int mmc_function_spy_do_tell = 0;

int mmc_function_spy(char * text)
{

	if (mmc_function_spy_do_tell)
		fprintf(stderr,"libburn: experimental: mmc_function_spy: %s\n",
			text);
	return 1;
}

int mmc_function_spy_ctrl(int do_tell)
{
	mmc_function_spy_do_tell= !!do_tell;
	return 1;
}


/* ts A70201 */
int mmc_four_char_to_int(unsigned char *data)
{
	return (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
}


/* ts A70201 */
int mmc_int_to_four_char(unsigned char *data, int num)
{
	data[0] = (num >> 24) & 0xff;
	data[1] = (num >> 16) & 0xff;
	data[2] = (num >> 8) & 0xff;
	data[3] = num & 0xff;
	return 1;
}


void mmc_send_cue_sheet(struct burn_drive *d, struct cue_sheet *s)
{
	struct buffer buf;
	struct command c;


	mmc_function_spy("mmc_send_cue_sheet");

	scsi_init_command(&c, MMC_SEND_CUE_SHEET, sizeof(MMC_SEND_CUE_SHEET));
/*
	c.oplen = sizeof(MMC_SEND_CUE_SHEET);
	memcpy(c.opcode, MMC_SEND_CUE_SHEET, sizeof(MMC_SEND_CUE_SHEET));
*/
	c.retry = 1;
	c.page = &buf;
	c.page->bytes = s->count * 8;
	c.page->sectors = 0;
	c.opcode[6] = (c.page->bytes >> 16) & 0xFF;
	c.opcode[7] = (c.page->bytes >> 8) & 0xFF;
	c.opcode[8] = c.page->bytes & 0xFF;
	c.dir = TO_DRIVE;
	memcpy(c.page->data, s->data, c.page->bytes);
	d->issue_command(d, &c);
}


/* ts A70205 : Announce size of a DVD-R[W] DAO session.
   @param size The size in bytes to be announced to the drive.
               It will get rounded up to align to 32 KiB.
*/
int mmc_reserve_track(struct burn_drive *d, off_t size)
{
	struct command c;
	int lba;
	char msg[80];

	mmc_function_spy("mmc_reserve_track");
	scsi_init_command(&c, MMC_RESERVE_TRACK, sizeof(MMC_RESERVE_TRACK));
/*
	c.oplen = sizeof(MMC_RESERVE_TRACK);
	memcpy(c.opcode, MMC_RESERVE_TRACK, sizeof(MMC_RESERVE_TRACK));
*/
	c.retry = 1;
	/* Round to 32 KiB and divide by 2048
	   (by nice binary rounding trick learned from dvd+rw-tools) */
	lba = ((size + (off_t) 0x7fff) >> 11) & ~0xf;
	mmc_int_to_four_char(c.opcode+5, lba);

	sprintf(msg, "reserving track of %d blocks", lba);
	libdax_msgs_submit(libdax_messenger, -1, 0x00000002,
			   LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_ZERO,
			   msg, 0, 0);

	c.page = NULL;
	c.dir = NO_TRANSFER;
	d->issue_command(d, &c);
	return !c.error;
}


/* ts A70201 :
   Common track info fetcher for mmc_get_nwa() and mmc_fake_toc()
*/
int mmc_read_track_info(struct burn_drive *d, int trackno, struct buffer *buf,
			int alloc_len)
{
	struct command c;

	mmc_function_spy("mmc_read_track_info");

	scsi_init_command(&c, MMC_TRACK_INFO, sizeof(MMC_TRACK_INFO));
/*
	c.oplen = sizeof(MMC_TRACK_INFO);
	memcpy(c.opcode, MMC_TRACK_INFO, sizeof(MMC_TRACK_INFO));
*/
	c.dxfer_len = alloc_len;
	c.opcode[7] = (c.dxfer_len >> 8) & 0xff;
	c.opcode[8] = c.dxfer_len & 0xff;
	c.retry = 1;
	c.opcode[1] = 1;
	if(trackno<=0) {
		if (d->current_profile == 0x1a || d->current_profile == 0x13 ||
		    d->current_profile == 0x12 )
			 /* DVD+RW , DVD-RW restricted overwrite , DVD-RAM */
			trackno = 1;
		else if (d->current_profile == 0x10 ||
			 d->current_profile == 0x11 ||
			 d->current_profile == 0x14 ||
			 d->current_profile == 0x15)
			/* DVD-ROM ,  DVD-R[W] Sequential */
			trackno = d->last_track_no;
		else /* mmc5r03c.pdf: valid only for CD, DVD+R, DVD+R DL */
			trackno = 0xFF;
	}
	mmc_int_to_four_char(c.opcode + 2, trackno);
	c.page = buf;
	memset(buf->data, 0, BUFFER_SIZE);
	c.dir = FROM_DRIVE;
	d->issue_command(d, &c);
	if (c.error)
		return 0;
	return 1;
}


/* ts A61110 : added parameters trackno, lba, nwa. Redefined return value. 
   @return 1=nwa is valid , 0=nwa is not valid , -1=error */
/* ts A70201 : outsourced 52h READ TRACK INFO command */
int mmc_get_nwa(struct burn_drive *d, int trackno, int *lba, int *nwa)
{
	struct buffer buf;
	int ret, num, alloc_len = 20;
	unsigned char *data;

	mmc_function_spy("mmc_get_nwa");

	ret = mmc_read_track_info(d, trackno, &buf, alloc_len);
	if (ret <= 0)
		return ret;
	data = buf.data;
	*lba = mmc_four_char_to_int(data + 8);
	*nwa = mmc_four_char_to_int(data + 12);
	num = mmc_four_char_to_int(data + 16);
	if (d->current_profile == 0x1a || d->current_profile == 0x13 ||
	    d->current_profile == 0x12) {
		 /* overwriteable */
		*lba = *nwa = num = 0;
	} else if (!(data[7]&1)) {
		/* ts A61106 :  MMC-1 Table 142 : NWA_V = NWA Valid Flag */
		libdax_msgs_submit(libdax_messenger, -1, 0x00000002,
			   LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_ZERO,
			   "mmc_get_nwa: Track Info Block: NWA_V == 0", 0, 0);
		return 0;
	}
	if (num > 0) {
		d->media_capacity_remaining = ((off_t) num) * ((off_t) 2048);
		d->media_lba_limit = *nwa + num;
	} else
		d->media_lba_limit = 0;

/*
	fprintf(stderr, "LIBBURN_DEBUG: media_lba_limit= %d\n",
		 d->media_lba_limit);
*/

	return 1;
}

/* ts A61009 : function is obviously unused. */
/* void mmc_close_disc(struct burn_drive *d, struct burn_write_opts *o) */
void mmc_close_disc(struct burn_write_opts *o)
{
	struct burn_drive *d;

	mmc_function_spy("mmc_close_disc");

	libdax_msgs_submit(libdax_messenger, -1, 0x00000002,
			   LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_ZERO,
			   "HOW THAT ? mmc_close_disc() was called", 0, 0);

	/* ts A61009 : made impossible by removing redundant parameter d */
	/* a ssert(o->drive == d); */
	d = o->drive;

	o->multi = 0;
	spc_select_write_params(d, o);
	mmc_close(d, 1, 0);
}

/* ts A61009 : function is obviously unused. */
/* void mmc_close_session(struct burn_drive *d, struct burn_write_opts *o) */
void mmc_close_session(struct burn_write_opts *o)
{
	struct burn_drive *d;

	mmc_function_spy("mmc_close_session");

	libdax_msgs_submit(libdax_messenger, -1, 0x00000002,
			   LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_ZERO,
			   "HOW THAT ? mmc_close_session() was called", 0, 0);

	/* ts A61009 : made impossible by removing redundant parameter d */
	/* a ssert(o->drive == d); */
	d = o->drive;

	o->multi = 3;
	spc_select_write_params(d, o);
	mmc_close(d, 1, 0);
}

/* ts A70227 : extended meaning of session to address all possible values
               of 5Bh CLOSE TRACK SESSION to address any Close Function.
               @param session contains the two high bits of Close Function
               @param track if not 0: sets the lowest bit of Close Function
*/
void mmc_close(struct burn_drive *d, int session, int track)
{
	struct command c;

	mmc_function_spy("mmc_close");

	scsi_init_command(&c, MMC_CLOSE, sizeof(MMC_CLOSE));
/*
	c.oplen = sizeof(MMC_CLOSE);
	memcpy(c.opcode, MMC_CLOSE, sizeof(MMC_CLOSE));
*/
	c.retry = 1;

	/* (ts A61030 : shifted !!session rather than or-ing plain session ) */
	c.opcode[2] = ((session & 3) << 1) | !!track;
	c.opcode[4] = track >> 8;
	c.opcode[5] = track & 0xFF;
	c.page = NULL;
	c.dir = NO_TRANSFER;
	d->issue_command(d, &c);
}

void mmc_get_event(struct burn_drive *d)
{
	struct buffer buf;
	struct command c;
	int alloc_len= 8;

	mmc_function_spy("mmc_get_event");

	scsi_init_command(&c, MMC_GET_EVENT, sizeof(MMC_GET_EVENT));
/*
	c.oplen = sizeof(MMC_GET_EVENT);
	memcpy(c.opcode, MMC_GET_EVENT, sizeof(MMC_GET_EVENT));
*/
	c.dxfer_len = alloc_len;
	c.opcode[7] = (c.dxfer_len >> 8) & 0xff;
	c.opcode[8] = c.dxfer_len & 0xff;
	c.retry = 1;
	c.page = &buf;
	c.page->bytes = 0;
	c.page->sectors = 0;
	c.dir = FROM_DRIVE;
	d->issue_command(d, &c);
	burn_print(12, "0x%x:0x%x:0x%x:0x%x\n",
		   c.page->data[0], c.page->data[1], c.page->data[2],
		   c.page->data[3]);
	burn_print(12, "event: %d:%d:%d:%d\n", c.page->data[4],
		   c.page->data[5], c.page->data[6], c.page->data[7]);
}


void mmc_write_12(struct burn_drive *d, int start, struct buffer *buf)
{
	struct command c;
	int len;

	mmc_function_spy("mmc_write_12");
	len = buf->sectors;

	/* ts A61009 */
	/* a ssert(buf->bytes >= buf->sectors);*/	/* can be == at 0... */

	burn_print(100, "trying to write %d at %d\n", len, start);

	scsi_init_command(&c, MMC_WRITE_12, sizeof(MMC_WRITE_12));
/*
	memcpy(c.opcode, MMC_WRITE_12, sizeof(MMC_WRITE_12));
	c.oplen = sizeof(MMC_WRITE_12);
*/
	c.retry = 1;
	mmc_int_to_four_char(c.opcode + 2, start);
	mmc_int_to_four_char(c.opcode + 6, len);
	c.page = buf;
	c.dir = TO_DRIVE;

	d->issue_command(d, &c);
}

int mmc_write(struct burn_drive *d, int start, struct buffer *buf)
{
	int cancelled;
	struct command c;
	int len;

#ifdef Libburn_log_in_and_out_streaM
	/* <<< ts A61031 */
	static int tee_fd= -1;
	if(tee_fd==-1)
		tee_fd= open("/tmp/libburn_sg_written",
				O_WRONLY|O_CREAT|O_TRUNC,S_IRUSR|S_IWUSR);
#endif /* Libburn_log_in_and_out_streaM */

	mmc_function_spy("mmc_write");
	pthread_mutex_lock(&d->access_lock);
	cancelled = d->cancel;
	pthread_mutex_unlock(&d->access_lock);

	if (cancelled)
		return BE_CANCELLED;

	/* ts A70215 */
	if (d->media_lba_limit > 0 && start >= d->media_lba_limit) {
		char msg[160];

		sprintf(msg,
		"Exceeding range of permissible write addresses (%d >= %d)",
				start, d->media_lba_limit);
		libdax_msgs_submit(libdax_messenger, d->global_index,
				0x0002012d,
				LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
				msg, 0, 0);
		d->cancel = 1; /* No need for mutexing because atomic */
		return BE_CANCELLED;
	}

	len = buf->sectors;

	/* ts A61009 : buffer fill problems are to be handled by caller */
	/* a ssert(buf->bytes >= buf->sectors);*/	/* can be == at 0... */

	burn_print(100, "trying to write %d at %d\n", len, start);

	scsi_init_command(&c, MMC_WRITE_10, sizeof(MMC_WRITE_10));
/*
	memcpy(c.opcode, MMC_WRITE_10, sizeof(MMC_WRITE_10));
	c.oplen = sizeof(MMC_WRITE_10);
*/
	c.retry = 1;
	mmc_int_to_four_char(c.opcode + 2, start);
	c.opcode[6] = 0;
	c.opcode[7] = (len >> 8) & 0xFF;
	c.opcode[8] = len & 0xFF;
	c.page = buf;
	c.dir = TO_DRIVE;
/*
	burn_print(12, "%d, %d, %d, %d - ", c->opcode[2], c->opcode[3], c->opcode[4], c->opcode[5]);
	burn_print(12, "%d, %d, %d, %d\n", c->opcode[6], c->opcode[7], c->opcode[8], c->opcode[9]);
*/

#ifdef Libburn_log_in_and_out_streaM
	/* <<< ts A61031 */
	if(tee_fd!=-1) {
		write(tee_fd,c.page->data,len*2048);
	}
#endif /* Libburn_log_in_and_out_streaM */

	d->issue_command(d, &c);

	/* ts A61112 : react on eventual error condition */ 
	if (c.error && c.sense[2]!=0) {

		/* >>> make this scsi_notify_error() when liberated */
		if (c.sense[2]!=0) {
			char msg[160];
			sprintf(msg,
		"SCSI error on write(%d,%d): key=%X asc=%2.2Xh ascq=%2.2Xh",
				start, len,
				c.sense[2],c.sense[12],c.sense[13]);
			libdax_msgs_submit(libdax_messenger, d->global_index,
				0x0002011d,
				LIBDAX_MSGS_SEV_FATAL, LIBDAX_MSGS_PRIO_HIGH,
				msg, 0, 0);
		}
		pthread_mutex_lock(&d->access_lock);
		d->cancel = 1;
		pthread_mutex_unlock(&d->access_lock);
		return BE_CANCELLED;
	} 

	return 0;
}


/* ts A70201 : Set up an entry for mmc_fake_toc() */
int mmc_fake_toc_entry(struct burn_toc_entry *entry, int session_number,
			 int track_number,
			 unsigned char *size_data, unsigned char *start_data)
{
	int min, sec, frames, num;

	/* mark DVD extensions as valid */
	entry->extensions_valid |= 1; 

	/* defaults are as of mmc5r03.pdf 6.26.3.2.4 Fabricated TOC */
	entry->session = session_number & 0xff;
	entry->session_msb = (session_number >> 8) & 0xff;
	entry->adr = 1;
	entry->control = 4;
	entry->tno = 0;
	entry->point = track_number & 0xff;
	entry->point_msb = (track_number >> 8) & 0xff;
	num = mmc_four_char_to_int(size_data);
	entry->track_blocks = num;
	burn_lba_to_msf(num, &min, &sec, &frames);
	if (min > 255) {
		min = 255;
		sec = 255;
		frames = 255;
	}
	entry->min = min;
	entry->sec = sec;
	entry->frame = frames;
	entry->zero = 0;
	num = mmc_four_char_to_int(start_data);
	entry->start_lba = num;
	burn_lba_to_msf(num, &min, &sec, &frames);
	if (min > 255) {
		min = 255;
		sec = 255;
		frames = 255;
	}
	entry->pmin = min;
	entry->psec = sec;
	entry->pframe = frames;
	return 1;
}


/* ts A70131 : compose a disc TOC structure from d->complete_sessions
               and 52h READ TRACK INFORMATION */
int mmc_fake_toc(struct burn_drive *d)
{
	struct burn_track *track;
	struct burn_session *session;
	struct burn_toc_entry *entry;
	struct buffer buf;
	int i, session_number, prev_session = -1, ret, lba, alloc_len = 34;
	unsigned char *tdata, size_data[4], start_data[4];
	char msg[160];

	if (d->last_track_no <= 0 || d->complete_sessions <= 0 ||
	    d->status == BURN_DISC_BLANK)
		return 2;
	if (d->last_track_no > BURN_MMC_FAKE_TOC_MAX_SIZE) {
		sprintf(msg,
			"Too many logical tracks recorded (%d , max. %d)\n",
			d->last_track_no, BURN_MMC_FAKE_TOC_MAX_SIZE);
		libdax_msgs_submit(libdax_messenger, d->global_index,
				 0x0002012c,
				 LIBDAX_MSGS_SEV_SORRY, LIBDAX_MSGS_PRIO_HIGH,
				 msg, 0,0);
		return 0;
	}
	d->disc = burn_disc_create();
	if (d->disc == NULL)
		return -1;
	d->toc_entries = d->last_track_no + d->complete_sessions;
	d->toc_entry = malloc(d->toc_entries * sizeof(struct burn_toc_entry));
	if (d->toc_entry == NULL)
		return -1;
	memset(d->toc_entry, 0,d->toc_entries * sizeof(struct burn_toc_entry));
	for (i = 0; i < d->complete_sessions; i++) {
		session = burn_session_create();
		burn_disc_add_session(d->disc, session, BURN_POS_END);
		burn_session_free(session);
	}
	memset(size_data, 0, 4);
	memset(start_data, 0, 4);

	/* Entry Layout :
		session 1   track 1     entry 0
		...
		session 1   track N     entry N-1
		leadout 1               entry N
		session 2   track N+1   entry N+1
		...
		session 2   track M+1   entry M+1
		leadout 2               entry M+2
		session X   track K     entry (K-1)+(X-1)
		...
		session X   track i+1   entry i+(X-1)
		leadout X               entry i+X
	*/
	for (i = 0; i < d->last_track_no; i++) {
		ret = mmc_read_track_info(d, i+1, &buf, alloc_len);
		if (ret <= 0)
			return ret;
		tdata = buf.data;
		session_number = (tdata[33] << 8) | tdata[3];
		if (session_number <= 0)
	continue;

		if (session_number != prev_session && prev_session > 0) {
			/* leadout entry previous session */
			entry = &(d->toc_entry[(i - 1) + prev_session]);
			lba = mmc_four_char_to_int(start_data) +
			      mmc_four_char_to_int(size_data);
			mmc_int_to_four_char(start_data, lba);
			mmc_int_to_four_char(size_data, 0);
			mmc_fake_toc_entry(entry, prev_session, 0xA2,
					 size_data, start_data);
			entry->min= entry->sec= entry->frame= 0;
			d->disc->session[prev_session - 1]->leadout_entry =
									entry;
		}

		if (session_number > d->disc->sessions) {
			if (i == d->last_track_no - 1) {
				/* ts A70212 : Last track field Free Blocks */
				d->media_capacity_remaining =
				  ((off_t) mmc_four_char_to_int(tdata + 16)) *
				  ((off_t) 2048);
				d->media_lba_limit = 0;
			}	
	continue;
		}

		entry = &(d->toc_entry[i + session_number - 1]);
 		track = burn_track_create();
		if (track == NULL)
			return -1;
		burn_session_add_track(
			d->disc->session[session_number - 1],
			track, BURN_POS_END);
		track->entry = entry;
		burn_track_free(track);

		memcpy(size_data, tdata + 24, 4);
		memcpy(start_data, tdata + 8, 4);
		mmc_fake_toc_entry(entry, session_number, i + 1,
					 size_data, start_data);

		if (prev_session != session_number)
			d->disc->session[session_number - 1]->firsttrack = i+1;
		d->disc->session[session_number - 1]->lasttrack = i+1;
		prev_session = session_number;
	}
	if (prev_session > 0 && prev_session <= d->disc->sessions) {
		/* leadout entry of last session of closed disc */
		entry = &(d->toc_entry[(d->last_track_no - 1) + prev_session]);
		lba = mmc_four_char_to_int(start_data) +
		      mmc_four_char_to_int(size_data);
		mmc_int_to_four_char(start_data, lba);
		mmc_int_to_four_char(size_data, 0);
		mmc_fake_toc_entry(entry, prev_session, 0xA2,
				 size_data, start_data);
		entry->min= entry->sec= entry->frame= 0;
		d->disc->session[prev_session - 1]->leadout_entry = entry;
	}
	return 1;
}


static int mmc_read_toc_al(struct burn_drive *d, int *alloc_len)
{
/* read full toc, all sessions, in m/s/f form, 4k buffer */
/* ts A70201 : or fake a toc from track information */
	struct burn_track *track;
	struct burn_session *session;
	struct buffer buf;
	struct command c;
	int dlen;
	int i, bpl= 12, old_alloc_len;
	unsigned char *tdata;

	mmc_function_spy("mmc_read_toc");

	if (*alloc_len < 4)
		return 0;

	if (!(d->current_profile == -1 || d->current_is_cd_profile)) {
		/* ts A70131 : MMC_GET_TOC uses Response Format 2 
		   For DVD this fails with 5,24,00 */
		/* One could try Response Format 0: mmc5r03.pdf 6.26.3.2
		   which does not yield the same result wit the same disc
		   on different drives.
		*/
		/* ts A70201 :
		   This uses the session count from 51h READ DISC INFORMATION
		   and the track records from 52h READ TRACK INFORMATION
		*/
		mmc_fake_toc(d);

		if (d->status == BURN_DISC_UNREADY)
			d->status = BURN_DISC_FULL;
		return 1;
	}
	scsi_init_command(&c, MMC_GET_TOC, sizeof(MMC_GET_TOC));
/*
	memcpy(c.opcode, MMC_GET_TOC, sizeof(MMC_GET_TOC));
	c.oplen = sizeof(MMC_GET_TOC);
*/
	c.dxfer_len = *alloc_len;
	c.opcode[7] = (c.dxfer_len >> 8) & 0xff;
	c.opcode[8] = c.dxfer_len & 0xff;
	c.retry = 1;
	c.page = &buf;
	c.page->bytes = 0;
	c.page->sectors = 0;
	c.dir = FROM_DRIVE;
	d->issue_command(d, &c);

	if (c.error) {

		/* ts A61020 : this snaps on non-blank DVD media */
		/* ts A61106 : also snaps on CD with unclosed track/session */
		/* Very unsure wether this old measure is ok.
		   Obviously higher levels do not care about this.
		   outdated info: DVD+RW burns go on after passing through here.

		d->busy = BURN_DRIVE_IDLE;
		*/
		libdax_msgs_submit(libdax_messenger, d->global_index,
			 0x0002010d,
			 LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_HIGH,
			 "Could not inquire TOC", 0,0);
		d->status = BURN_DISC_UNSUITABLE;