Add a new command, 'cdid', to calculate and display a serial number
for a cd, using the algorithm that the cddb database uses. Submitted by: Sergey Shkonda <serg@bcs.zp.ua>
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parent
21b8ebd926
commit
241f197320
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=63091
@ -148,6 +148,10 @@ the current media catalog status,
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.Nm volume
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the current values of the volume for left and right channels.
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.It Cm cdid
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Display the serial number of the cd using the method used by the
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cddb (http://www.cddb.org/) project.
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.It Cm help
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Print the list of available commands.
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@ -67,6 +67,7 @@ static const char rcsid[] =
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#define CMD_RESET 12
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#define CMD_SET 13
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#define CMD_STATUS 14
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#define CMD_CDID 15
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#define STATUS_AUDIO 0x1
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#define STATUS_MEDIA 0x2
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#define STATUS_VOLUME 0x4
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@ -95,6 +96,7 @@ struct cmdtab {
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{ CMD_STATUS, "status", 1, "[audio | media | volume]" },
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{ CMD_STOP, "stop", 3, "" },
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{ CMD_VOLUME, "volume", 1, "<l> <r> | left | right | mute | mono | stereo" },
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{ CMD_CDID, "cdid", 2, "" },
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{ 0, }
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};
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@ -114,6 +116,7 @@ int status __P((int *, int *, int *, int *));
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int open_cd __P((void));
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int play __P((char *arg));
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int info __P((char *arg));
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int cdid __P((void));
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int pstatus __P((char *arg));
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char *input __P((int *));
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void prtrack __P((struct cd_toc_entry *e, int lastflag));
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@ -254,6 +257,12 @@ int run (int cmd, char *arg)
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return info (arg);
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case CMD_CDID:
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if (fd < 0 && ! open_cd ())
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return (0);
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return cdid ();
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case CMD_STATUS:
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if (fd < 0 && ! open_cd ())
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return (0);
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@ -743,6 +752,92 @@ int pstatus (char *arg)
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return(0);
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}
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/*
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* dbprog_sum
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* Convert an integer to its text string representation, and
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* compute its checksum. Used by dbprog_discid to derive the
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* disc ID.
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*
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* Args:
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* n - The integer value.
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*
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* Return:
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* The integer checksum.
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*/
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static int
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dbprog_sum(int n)
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{
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char buf[12],
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*p;
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int ret = 0;
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/* For backward compatibility this algorithm must not change */
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sprintf(buf, "%u", n);
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for (p = buf; *p != '\0'; p++)
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ret += (*p - '0');
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return(ret);
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}
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/*
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* dbprog_discid
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* Compute a magic disc ID based on the number of tracks,
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* the length of each track, and a checksum of the string
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* that represents the offset of each track.
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*
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* Args:
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* s - Pointer to the curstat_t structure.
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*
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* Return:
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* The integer disc ID.
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*/
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static u_int
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dbprog_discid()
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{
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struct ioc_toc_header h;
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int rc;
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int i, ntr,
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t = 0,
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n = 0;
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rc = ioctl (fd, CDIOREADTOCHEADER, &h);
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if (rc < 0)
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return 0;
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ntr = h.ending_track - h.starting_track + 1;
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i = msf;
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msf = 1;
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rc = read_toc_entrys ((ntr + 1) * sizeof (struct cd_toc_entry));
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msf = i;
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if (rc < 0)
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return 0;
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/* For backward compatibility this algorithm must not change */
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for (i = 0; i < ntr; i++) {
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#define TC_MM(a) toc_buffer[a].addr.msf.minute
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#define TC_SS(a) toc_buffer[a].addr.msf.second
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n += dbprog_sum((TC_MM(i) * 60) + TC_SS(i));
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t += ((TC_MM(i+1) * 60) + TC_SS(i+1)) -
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((TC_MM(i) * 60) + TC_SS(i));
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}
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return((n % 0xff) << 24 | t << 8 | ntr);
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}
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int cdid ()
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{
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u_int id;
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id = dbprog_discid();
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if (id)
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{
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if (verbose)
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printf ("CDID=");
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printf ("%08x\n",id);
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}
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return id ? 0 : 1;
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}
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int info (char *arg)
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{
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struct ioc_toc_header h;
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