static int
findntracks(Drive *drive, int *firstp, int *lastp)
{
int i, n, first, last;
uint8_t resp[1024];
if((n = mmcreadtoc(drive, Msfbit, 0, resp, sizeof(resp))) < 4) {
/*
* it could be a blank disc. in case it's a blank disc in a
* cd-rw drive, use readdiscinfo to try to find the track info.
*/
if(getdiscinfo(drive, resp, sizeof(resp)) < 7)
return -1;
assert((resp[2] & 0340) == 0); /* data type 0 */
if(resp[4] != 1)
print("multi-session disc %d\n", resp[4]);
drive->writeok = Yes;
/*
* some drives (e.g., LG's BDs) report only 1 track on an
* unfinalized disc, so probe every track. the nwa reported
* by such drives may be wrong (e.g., 0), so compute that too.
*/
first = resp[3];
last = resp[6];
if(vflag)
print("rdiscinfo tracks %d-%d (last==1 means TBD)\n",
first, last);
if(last == 1)
last = Maxresptracks; /* probe the tracks */
} else {
first = resp[2];
last = resp[3];
if(vflag)
print("toc tracks %d-%d (last==1 means TBD)\n",
first, last);
if(last == 1)
last = Maxresptracks; /* probe the tracks */
if(n >= 4+8*(last-first+2)) {
/* resp[4 + i*8 + 2] is track # */
/* <=: track[last-first+1] = end */
for(i=0; i<=last-first+1; i++)
drive->track[i].mbeg = rdmsf(resp+4+i*8+5);
for(i=0; i<last-first+1; i++)
drive->track[i].mend = drive->track[i+1].mbeg;
}
}
*firstp = first;
*lastp = last;
return 0;
}
/* this gets called a lot from main.c's 9P routines */
static int
mmcgettoc(Drive *drive)
{
int i, n, first, last;
uchar resp[1024];
Mmcaux *aux;
/*
* if someone has swapped the cd,
* mmcreadtoc will get ``medium changed'' and the
* scsi routines will set nchange and changetime in the
* scsi device.
*/
mmcreadtoc(drive, 0, 0, resp, sizeof(resp));
if(drive->Scsi.changetime == 0) { /* no media present */
drive->mmctype = Mmcnone;
drive->ntrack = 0;
return 0;
}
/*
* if the disc doesn't appear to be have been changed, and there
* is a disc in this drive, there's nothing to do (the common case).
*/
if(drive->nchange == drive->Scsi.nchange && drive->changetime != 0)
return 0;
/*
* the disc in the drive may have just been changed,
* so rescan it and relearn all about it.
*/
drive->ntrack = 0;
drive->nameok = 0;
drive->nchange = drive->Scsi.nchange;
drive->changetime = drive->Scsi.changetime;
drive->writeok = drive->erasable = drive->recordable = drive->blank = 0;
drive->erasableset = drive->recordableset = drive->blankset = 0;
aux = drive->aux;
aux->mmcnwa = 0;
aux->nropen = aux->nwopen = 0;
aux->ntotby = aux->ntotbk = 0;
for(i=0; i<nelem(drive->track); i++){
memset(&drive->track[i].mbeg, 0, sizeof(Msf));
memset(&drive->track[i].mend, 0, sizeof(Msf));
}
/*
* TODO: set read ahead, MMC-6 §6.37, seems to control caching.
*/
/*
* find number of tracks
*/
if((n = mmcreadtoc(drive, Msfbit, 0, resp, sizeof(resp))) < 4) {
/*
* on a blank disc in a cd-rw, use readdiscinfo
* to find the track info.
*/
if(getdiscinfo(drive, resp, sizeof(resp)) < 7)
return -1;
assert((resp[2] & 0340) == 0); /* data type 0 */
if(resp[4] != 1)
print("multi-session disc %d\n", resp[4]);
first = resp[3];
last = resp[6];
if(vflag)
print("blank disc %d %d\n", first, last);
/* the assumption of blankness may be unwarranted */
drive->writeok = drive->blank = drive->blankset = 1;
} else {
first = resp[2];
last = resp[3];
if(n >= 4+8*(last-first+2)) {
/* resp[4 + i*8 + 2] is track # */
/* <=: track[last-first+1] = end */
for(i=0; i<=last-first+1; i++)
drive->track[i].mbeg = rdmsf(resp+4+i*8+5);
for(i=0; i<last-first+1; i++)
drive->track[i].mend = drive->track[i+1].mbeg;
}
}
drive->mmctype = Mmcnone;
drive->dvdtype = nil;
getdvdstruct(drive);
getbdstruct(drive);
if (drive->mmctype == Mmcnone)
drive->mmctype = Mmccd; /* by default */
if (drive->recordable || drive->erasable)
drive->writeok = 1;
if (vflag) {
fprint(2, "writeok %d", drive->writeok);
/* drive->blank is never used and hard to figure out */
// if (drive->blankset)
// fprint(2, " blank %d", drive->blank);
if (drive->recordableset)
fprint(2, " recordable %d", drive->recordable);
if (drive->erasableset)
fprint(2, " erasable %d", drive->erasable);
fprint(2, "\n");
print("first %d last %d\n", first, last);
}
if(first == 0 && last == 0)
first = 1;
if(first <= 0 || first >= Maxtrack) {
werrstr("first table %d not in range", first);
return -1;
}
if(last <= 0 || last >= Maxtrack) {
werrstr("last table %d not in range", last);
return -1;
}
if(drive->cap & Cwrite) /* CDR drives are easy */
for(i = first; i <= last; i++)
mmctrackinfo(drive, i, i - first);
else
/*
* otherwise we need to infer endings from the
* beginnings of other tracks.
*/
mmcinfertracks(drive, first, last);
drive->firsttrack = first;
drive->ntrack = last+1-first;
return 0;
}
