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/*
* Copyright 2003-2019 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 "DatabaseSave.hxx"
#include "db/DatabaseLock.hxx"
#include "Directory.hxx"
#include "DirectorySave.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "fs/io/TextFile.hxx"
#include "tag/ParseName.hxx"
#include "tag/Settings.hxx"
#include "fs/Charset.hxx"
#include "util/StringCompare.hxx"
#include "util/RuntimeError.hxx"
#include <string.h>
#include <stdlib.h>
#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: "
static constexpr unsigned DB_FORMAT = 2;
/**
* The oldest database format understood by this MPD version.
*/
static constexpr unsigned OLDEST_DB_FORMAT = 1;
void
db_save_internal(BufferedOutputStream &os, const Directory &music_root)
{
os.Format("%s\n", DIRECTORY_INFO_BEGIN);
os.Format(DB_FORMAT_PREFIX "%u\n", DB_FORMAT);
os.Format("%s%s\n", DIRECTORY_MPD_VERSION, VERSION);
os.Format("%s%s\n", DIRECTORY_FS_CHARSET, GetFSCharset());
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (IsTagEnabled(i))
os.Format(DB_TAG_PREFIX "%s\n", tag_item_names[i]);
os.Format("%s\n", DIRECTORY_INFO_END);
directory_save(os, music_root);
}
void
db_load_internal(TextFile &file, Directory &music_root)
{
char *line;
unsigned format = 0;
bool found_charset = false, found_version = false;
bool tags[TAG_NUM_OF_ITEM_TYPES];
/* get initial info */
line = file.ReadLine();
if (line == nullptr || strcmp(DIRECTORY_INFO_BEGIN, line) != 0)
throw std::runtime_error("Database corrupted");
memset(tags, false, sizeof(tags));
while ((line = file.ReadLine()) != nullptr &&
strcmp(line, DIRECTORY_INFO_END) != 0) {
const char *p;
if ((p = StringAfterPrefix(line, DB_FORMAT_PREFIX))) {
format = atoi(p);
} else if (StringStartsWith(line, DIRECTORY_MPD_VERSION)) {
if (found_version)
throw std::runtime_error("Duplicate version line");
found_version = true;
} else if ((p = StringAfterPrefix(line, DIRECTORY_FS_CHARSET))) {
if (found_charset)
throw std::runtime_error("Duplicate charset line");
found_charset = true;
const char *new_charset = p;
const char *const old_charset = GetFSCharset();
if (*old_charset != 0
&& strcmp(new_charset, old_charset) != 0)
throw FormatRuntimeError("Existing database has charset "
"\"%s\" instead of \"%s\"; "
"discarding database file",
new_charset, old_charset);
} else if ((p = StringAfterPrefix(line, DB_TAG_PREFIX))) {
const char *name = p;
TagType tag = tag_name_parse(name);
if (tag == TAG_NUM_OF_ITEM_TYPES)
throw FormatRuntimeError("Unrecognized tag '%s', "
"discarding database file",
name);
tags[tag] = true;
} else {
throw FormatRuntimeError("Malformed line: %s", line);
}
}
if (format < OLDEST_DB_FORMAT || format > DB_FORMAT)
throw std::runtime_error("Database format mismatch, "
"discarding database file");
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if (IsTagEnabled(i) && !tags[i])
throw std::runtime_error("Tag list mismatch, "
"discarding database file");
const ScopeDatabaseLock protect;
directory_load(file, music_root);
}
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