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Diffstat (limited to '')
| -rw-r--r-- | src/db/plugins/simple/DatabaseSave.cxx | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/src/db/plugins/simple/DatabaseSave.cxx b/src/db/plugins/simple/DatabaseSave.cxx new file mode 100644 index 000000000..c766843b6 --- /dev/null +++ b/src/db/plugins/simple/DatabaseSave.cxx @@ -0,0 +1,160 @@ +/* + * Copyright (C) 2003-2014 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 "DatabaseSave.hxx" +#include "db/DatabaseLock.hxx" +#include "db/DatabaseError.hxx" +#include "Directory.hxx" +#include "DirectorySave.hxx" +#include "fs/io/BufferedOutputStream.hxx" +#include "fs/io/TextFile.hxx" +#include "tag/Tag.hxx" +#include "tag/TagSettings.h" +#include "fs/Charset.hxx" +#include "util/StringUtil.hxx" +#include "util/Error.hxx" +#include "Log.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 (!ignore_tag_items[i]) + os.Format(DB_TAG_PREFIX "%s\n", tag_item_names[i]); + + os.Format("%s\n", DIRECTORY_INFO_END); + + directory_save(os, music_root); +} + +bool +db_load_internal(TextFile &file, Directory &music_root, Error &error) +{ + char *line; + unsigned format = 0; + bool found_charset = false, found_version = false; + bool success; + bool tags[TAG_NUM_OF_ITEM_TYPES]; + + /* get initial info */ + line = file.ReadLine(); + if (line == nullptr || strcmp(DIRECTORY_INFO_BEGIN, line) != 0) { + error.Set(db_domain, "Database corrupted"); + return false; + } + + memset(tags, false, sizeof(tags)); + + while ((line = file.ReadLine()) != nullptr && + strcmp(line, DIRECTORY_INFO_END) != 0) { + if (StringStartsWith(line, DB_FORMAT_PREFIX)) { + format = atoi(line + sizeof(DB_FORMAT_PREFIX) - 1); + } else if (StringStartsWith(line, DIRECTORY_MPD_VERSION)) { + if (found_version) { + error.Set(db_domain, "Duplicate version line"); + return false; + } + + found_version = true; + } else if (StringStartsWith(line, DIRECTORY_FS_CHARSET)) { + const char *new_charset; + + if (found_charset) { + error.Set(db_domain, "Duplicate charset line"); + return false; + } + + found_charset = true; + + new_charset = line + sizeof(DIRECTORY_FS_CHARSET) - 1; + const char *const old_charset = GetFSCharset(); + if (*old_charset != 0 + && strcmp(new_charset, old_charset) != 0) { + error.Format(db_domain, + "Existing database has charset " + "\"%s\" instead of \"%s\"; " + "discarding database file", + new_charset, old_charset); + return false; + } + } else if (StringStartsWith(line, DB_TAG_PREFIX)) { + const char *name = line + sizeof(DB_TAG_PREFIX) - 1; + TagType tag = tag_name_parse(name); + if (tag == TAG_NUM_OF_ITEM_TYPES) { + error.Format(db_domain, + "Unrecognized tag '%s', " + "discarding database file", + name); + return false; + } + + tags[tag] = true; + } else { + error.Format(db_domain, "Malformed line: %s", line); + return false; + } + } + + if (format < OLDEST_DB_FORMAT || format > DB_FORMAT) { + error.Set(db_domain, + "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]) { + error.Set(db_domain, + "Tag list mismatch, " + "discarding database file"); + return false; + } + } + + LogDebug(db_domain, "reading DB"); + + db_lock(); + success = directory_load(file, music_root, error); + db_unlock(); + + return success; +} |