Date: Wed, 6 Oct 1999 13:02:14 +0300 (EEST) From: Sergey Shkonda <serg@bcs.zp.ua> To: hackers@freebsd.org Subject: New command for cdcontrol(1) Message-ID: <199910061002.NAA28930@bcs3.bcs.zp.ua>
next in thread | raw e-mail | index | archive | help
I'm using this patch for cdcontrol(1):
cdid Print the xmcd's CD id.
--- cdcontrol.c.orig Sun Aug 29 18:40:16 1999
+++ cdcontrol.c Wed Oct 6 12:01:35 1999
@@ -33,6 +33,7 @@
#include <sys/file.h>
#include <sys/cdio.h>
#include <sys/ioctl.h>
+#include <sys/types.h>
#define VERSION "2.0"
@@ -65,6 +66,7 @@
#define CMD_RESET 12
#define CMD_SET 13
#define CMD_STATUS 14
+#define CMD_CDID 15
#define STATUS_AUDIO 0x1
#define STATUS_MEDIA 0x2
#define STATUS_VOLUME 0x4
@@ -93,6 +95,7 @@
{ CMD_STATUS, "status", 1, "[audio | media | volume]" },
{ CMD_STOP, "stop", 3, "" },
{ CMD_VOLUME, "volume", 1, "<l> <r> | left | right | mute | mono | stereo" },
+{ CMD_CDID, "cdid", 2, "" },
{ 0, }
};
@@ -112,6 +115,7 @@
int open_cd __P((void));
int play __P((char *arg));
int info __P((char *arg));
+int cdid __P((void));
int pstatus __P((char *arg));
char *input __P((int *));
void prtrack __P((struct cd_toc_entry *e, int lastflag));
@@ -252,6 +256,12 @@
return info (arg);
+ case CMD_CDID:
+ if (fd < 0 && ! open_cd ())
+ return (0);
+
+ return cdid ();
+
case CMD_STATUS:
if (fd < 0 && ! open_cd ())
return (0);
@@ -739,6 +749,92 @@
printf ("No volume level info available\n");
}
return(0);
+}
+
+/*
+ * dbprog_sum
+ * Convert an integer to its text string representation, and
+ * compute its checksum. Used by dbprog_discid to derive the
+ * disc ID.
+ *
+ * Args:
+ * n - The integer value.
+ *
+ * Return:
+ * The integer checksum.
+ */
+static int
+dbprog_sum(int n)
+{
+ char buf[12],
+ *p;
+ int ret = 0;
+
+ /* For backward compatibility this algorithm must not change */
+ sprintf(buf, "%u", n);
+ for (p = buf; *p != '\0'; p++)
+ ret += (*p - '0');
+
+ return(ret);
+}
+
+
+/*
+ * dbprog_discid
+ * Compute a magic disc ID based on the number of tracks,
+ * the length of each track, and a checksum of the string
+ * that represents the offset of each track.
+ *
+ * Args:
+ * s - Pointer to the curstat_t structure.
+ *
+ * Return:
+ * The integer disc ID.
+ */
+static u_int
+dbprog_discid()
+{
+ struct ioc_toc_header h;
+ int rc;
+ int i, ntr,
+ t = 0,
+ n = 0;
+
+ rc = ioctl (fd, CDIOREADTOCHEADER, &h);
+ if (rc < 0)
+ return 0;
+ ntr = h.ending_track - h.starting_track + 1;
+ i = msf;
+ msf = 1;
+ rc = read_toc_entrys ((ntr + 1) * sizeof (struct cd_toc_entry));
+ msf = i;
+ if (rc < 0)
+ return 0;
+ /* For backward compatibility this algorithm must not change */
+ for (i = 0; i < ntr; i++) {
+#define TC_MM(a) toc_buffer[a].addr.msf.minute
+#define TC_SS(a) toc_buffer[a].addr.msf.second
+ n += dbprog_sum((TC_MM(i) * 60) + TC_SS(i));
+
+ t += ((TC_MM(i+1) * 60) + TC_SS(i+1)) -
+ ((TC_MM(i) * 60) + TC_SS(i));
+ }
+
+ return((n % 0xff) << 24 | t << 8 | ntr);
+}
+
+int cdid ()
+{
+ u_int id;
+
+ id = dbprog_discid();
+ if (id)
+ {
+ if (verbose)
+ printf ("CDID=");
+ printf ("%08x\n",id);
+ }
+ return id ? 0 : 1;
}
int info (char *arg)
--- cdcontrol.1.orig Sun Aug 29 18:40:15 1999
+++ cdcontrol.1 Wed Oct 6 12:04:42 1999
@@ -129,6 +129,9 @@
.It Cm info
Print the table of contents.
+.It Cm cdid
+Print the xmcd's CD id.
+
.It Cm status
.Op Ar audio | media | volume
--
Sergey Shkonda <serg@bcs.zp.ua>
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199910061002.NAA28930>