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Use ntohs/ntohl when reading TOC instead of hardcoded byte swapping.

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Put fake entry len for MSF format too.
This commit is contained in:
Andrey A. Chernov 1996-01-30 16:12:18 +00:00
parent 48ce3c2cee
commit 62bdf2b7c6
1 changed files with 37 additions and 9 deletions
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46
sys/scsi/cd.c
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@ -14,7 +14,7 @@
*
* Ported to run under 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
*
* $Id: cd.c,v 1.57 1996/01/30 12:59:00 ache Exp $
* $Id: cd.c,v 1.58 1996/01/30 14:30:43 ache Exp $
*/
#include "opt_bounce.h"
@ -195,6 +195,15 @@ cd_registerdev(int unit)
}
}
static inline void lba2msf (int lba, u_char *m, u_char *s, u_char *f)
{
lba += 150; /* offset of first logical frame */
lba &= 0xffffff; /* negative lbas use only 24 bits */
*m = lba / (60 * 75);
lba %= (60 * 75);
*s = lba / 75;
*f = lba % 75;
}
/*
* The routine called by the low level scsi routine when it discovers
@ -747,7 +756,7 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
(struct cd_toc_entry *)&th, sizeof th);
if (error)
break;
th.len = ((th.len & 0xff) << 8) + ((th.len >> 8) & 0xff);
NTOHS(th.len);
bcopy(&th, addr, sizeof th);
}
break;
@ -760,7 +769,7 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
struct ioc_read_toc_entry *te =
(struct ioc_read_toc_entry *) addr;
struct ioc_toc_header *th;
u_int32 len, readlen, idx;
u_int32 len, readlen, idx, num;
u_int32 starting_track = te->starting_track;
if ( te->data_len < sizeof(struct cd_toc_entry)
@ -771,11 +780,14 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
error = EINVAL;
break;
}
th = &data.header;
error = cd_read_toc(unit, 0, 0,
(struct cd_toc_entry *)th, sizeof *th);
(struct cd_toc_entry *)th, sizeof (*th));
if (error)
break;
NTOHS(th->len);
if (starting_track == 0)
starting_track = th->starting_track;
else if (starting_track == 170)
@ -785,6 +797,7 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
error = EINVAL;
break;
}
len = ((th->ending_track + 1 - starting_track) + 1) *
sizeof(struct cd_toc_entry);
if (te->data_len < len)
@ -793,6 +806,7 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
error = EINVAL;
break;
}
num = len / sizeof(struct cd_toc_entry);
/* calculate reading length without leadout entry */
readlen = ((int)th->ending_track - starting_track) + 1;
@ -804,14 +818,13 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
error = cd_read_toc(unit, te->address_format,
starting_track,
(struct cd_toc_entry *)&data,
readlen + sizeof(struct ioc_toc_header));
data.entries,
readlen);
if (error)
break;
th->len = ((th->len & 0xff) << 8) + ((th->len >> 8) & 0xff);
/* make fake leadout entry if needed */
idx = starting_track + len / sizeof(struct cd_toc_entry) - 1;
idx = starting_track + num - 1;
if (idx == th->ending_track + 1) {
idx -= starting_track; /* now offset in the entries */
if (idx > 0) {
@ -819,7 +832,22 @@ cd_ioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p,
data.entries[idx].addr_type = data.entries[idx-1].addr_type;
}
data.entries[idx].track = 170; /* magic */
data.entries[idx].addr.lba = th->len;
switch (te->address_format) {
case CD_MSF_FORMAT:
lba2msf (th->len,
&data.entries[idx].addr.msf.minute,
&data.entries[idx].addr.msf.second,
&data.entries[idx].addr.msf.frame);
break;
case CD_LBA_FORMAT:
data.entries[idx].addr.lba = htonl(th->len);
break;
}
}
if (te->address_format == CD_LBA_FORMAT) {
for (idx = 0; idx < num; idx++)
NTOHL(data.entries[idx].addr.lba);
}
error = copyout(data.entries, te->data, len);