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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "db_save.h"
#include "db_lock.h"
#include "directory.h"
#include "directory_save.h"
#include "song.h"
#include "path.h"
#include "text_file.h"
#include "tag.h"
#include "tag_internal.h"
#include <glib.h>
#include <assert.h>
#include <stdlib.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "database"
#define DIRECTORY_INFO_BEGIN "info_begin"
#define DIRECTORY_INFO_END "info_end"
#define DB_FORMAT_PREFIX "format: "
#define DIRECTORY_MPD_VERSION "mpd_version: "
#define DIRECTORY_FS_CHARSET "fs_charset: "
#define DB_TAG_PREFIX "tag: "
enum {
DB_FORMAT = 1,
};
G_GNUC_CONST
static GQuark
db_quark(void)
{
return g_quark_from_static_string("database");
}
void
db_save_internal(FILE *fp, const struct directory *music_root)
{
assert(music_root != NULL);
fprintf(fp, "%s\n", DIRECTORY_INFO_BEGIN);
fprintf(fp, DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
fprintf(fp, "%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
fprintf(fp, "%s%s\n", DIRECTORY_FS_CHARSET, path_get_fs_charset());
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (!ignore_tag_items[i])
fprintf(fp, DB_TAG_PREFIX "%s\n", tag_item_names[i]);
fprintf(fp, "%s\n", DIRECTORY_INFO_END);
directory_save(fp, music_root);
}
bool
db_load_internal(FILE *fp, struct directory *music_root, GError **error)
{
GString *buffer = g_string_sized_new(1024);
char *line;
int format = 0;
bool found_charset = false, found_version = false;
bool success;
bool tags[TAG_NUM_OF_ITEM_TYPES];
assert(music_root != NULL);
/* get initial info */
line = read_text_line(fp, buffer);
if (line == NULL || strcmp(DIRECTORY_INFO_BEGIN, line) != 0) {
g_set_error(error, db_quark(), 0, "Database corrupted");
g_string_free(buffer, true);
return false;
}
memset(tags, false, sizeof(tags));
while ((line = read_text_line(fp, buffer)) != NULL &&
strcmp(line, DIRECTORY_INFO_END) != 0) {
if (g_str_has_prefix(line, DB_FORMAT_PREFIX)) {
format = atoi(line + sizeof(DB_FORMAT_PREFIX) - 1);
} else if (g_str_has_prefix(line, DIRECTORY_MPD_VERSION)) {
if (found_version) {
g_set_error(error, db_quark(), 0,
"Duplicate version line");
g_string_free(buffer, true);
return false;
}
found_version = true;
} else if (g_str_has_prefix(line, DIRECTORY_FS_CHARSET)) {
const char *new_charset, *old_charset;
if (found_charset) {
g_set_error(error, db_quark(), 0,
"Duplicate charset line");
g_string_free(buffer, true);
return false;
}
found_charset = true;
new_charset = line + sizeof(DIRECTORY_FS_CHARSET) - 1;
old_charset = path_get_fs_charset();
if (old_charset != NULL
&& strcmp(new_charset, old_charset)) {
g_set_error(error, db_quark(), 0,
"Existing database has charset "
"\"%s\" instead of \"%s\"; "
"discarding database file",
new_charset, old_charset);
g_string_free(buffer, true);
return false;
}
} else if (g_str_has_prefix(line, DB_TAG_PREFIX)) {
const char *name = line + sizeof(DB_TAG_PREFIX) - 1;
enum tag_type tag = tag_name_parse(name);
if (tag == TAG_NUM_OF_ITEM_TYPES) {
g_set_error(error, db_quark(), 0,
"Unrecognized tag '%s', "
"discarding database file",
name);
return false;
}
tags[tag] = true;
} else {
g_set_error(error, db_quark(), 0,
"Malformed line: %s", line);
g_string_free(buffer, true);
return false;
}
}
if (format != DB_FORMAT) {
g_set_error(error, db_quark(), 0,
"Database format mismatch, "
"discarding database file");
return false;
}
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
if (!ignore_tag_items[i] && !tags[i]) {
g_set_error(error, db_quark(), 0,
"Tag list mismatch, "
"discarding database file");
return false;
}
}
g_debug("reading DB");
db_lock();
success = directory_load(fp, music_root, buffer, error);
db_unlock();
g_string_free(buffer, true);
return success;
}
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