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/* --------------------------------------------------------------------------
MusicBrainz -- The Internet music metadatabase
Copyright (C) 2006 Matthias Friedrich
Copyright (C) 2000 Robert Kaye
Copyright (C) 1999 Marc E E van Woerkom
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
--------------------------------------------------------------------------- */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include "discid/discid_private.h"
#include "unix.h"
int mb_disc_unix_exists(const char *device) {
int fd;
fd = open(device, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
/* we only check for existance, access should fail later on */
if (errno == ENOENT) {
return 0;
} else {
return 1;
}
} else {
close(fd);
return 1;
}
}
char *mb_disc_unix_find_device(char *candidates[], int num_candidates) {
int i;
for (i = 0; i < num_candidates; i++) {
if (mb_disc_unix_exists(candidates[i])) {
return candidates[i];
}
}
/* use the first name for the error message later on */
return candidates[0];
}
int mb_disc_unix_open(mb_disc_private *disc, const char *device) {
int fd;
fd = open(device, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
"cannot open device `%s'", device);
}
/* fd < 0 check needs to be made by caller */
return fd;
}
int mb_disc_unix_read_toc(int fd, mb_disc_private *disc, mb_disc_toc *toc) {
int i;
/* Find the numbers of the first track (usually 1) and the last track. */
if ( !mb_disc_unix_read_toc_header(fd, toc) ) {
snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
"cannot read table of contents");
return 0;
}
/* basic error checking */
if ( toc->last_track_num == 0 ) {
snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
"this disc has no tracks");
return 0;
}
/*
* Read the TOC entry for every track.
*/
for (i = toc->first_track_num; i <= toc->last_track_num; i++) {
if ( !mb_disc_unix_read_toc_entry(fd, i, &toc->tracks[i]) ) {
snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
"cannot read TOC entry for track %d", i);
return 0;
}
}
if ( !mb_disc_unix_read_toc_entry(fd, 0xAA, &toc->tracks[0]) ) {
snprintf(disc->error_msg, MB_ERROR_MSG_LENGTH,
"cannot read TOC entry for lead-out");
return 0;
}
return 1;
}
int mb_disc_unix_read(mb_disc_private *disc, const char *device,
unsigned int features) {
mb_disc_toc toc;
int fd;
int i;
fd = mb_disc_unix_open(disc, device);
if (fd < 0)
return 0;
if ( !mb_disc_unix_read_toc(fd, disc, &toc) ) {
close(fd);
return 0;
}
if ( !mb_disc_load_toc(disc, &toc) ) {
close(fd);
return 0;
}
/* Read in the media catalog number */
if (features & DISCID_FEATURE_MCN
&& mb_disc_has_feature_unportable(DISCID_FEATURE_MCN)) {
mb_disc_unix_read_mcn(fd, disc);
}
/* Read the ISRC for the track */
if (features & DISCID_FEATURE_ISRC
&& mb_disc_has_feature_unportable(DISCID_FEATURE_ISRC)) {
for (i = disc->first_track_num; i <= disc->last_track_num; i++) {
mb_disc_unix_read_isrc(fd, disc, i);
}
}
close(fd);
return 1;
}
/* EOF */
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