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/*
* Copyright 2003-2020 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 "DirectorySave.hxx"
#include "Directory.hxx"
#include "Song.hxx"
#include "SongSave.hxx"
#include "song/DetachedSong.hxx"
#include "PlaylistDatabase.hxx"
#include "fs/io/TextFile.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "time/ChronoUtil.hxx"
#include "util/StringAPI.hxx"
#include "util/StringCompare.hxx"
#include "util/NumberParser.hxx"
#include "util/RuntimeError.hxx"
#include <string.h>
#define DIRECTORY_DIR "directory: "
#define DIRECTORY_TYPE "type: "
#define DIRECTORY_MTIME "mtime: "
#define DIRECTORY_BEGIN "begin: "
#define DIRECTORY_END "end: "
gcc_const
static const char *
DeviceToTypeString(unsigned device) noexcept
{
switch (device) {
case DEVICE_INARCHIVE:
return "archive";
case DEVICE_CONTAINER:
return "container";
case DEVICE_PLAYLIST:
return "playlist";
default:
return nullptr;
}
}
gcc_pure
static unsigned
ParseTypeString(const char *type) noexcept
{
if (StringIsEqual(type, "archive"))
return DEVICE_INARCHIVE;
else if (StringIsEqual(type, "container"))
return DEVICE_CONTAINER;
else if (StringIsEqual(type, "playlist"))
return DEVICE_PLAYLIST;
else
return 0;
}
void
directory_save(BufferedOutputStream &os, const Directory &directory)
{
if (!directory.IsRoot()) {
const char *type = DeviceToTypeString(directory.device);
if (type != nullptr)
os.Format(DIRECTORY_TYPE "%s\n", type);
if (!IsNegative(directory.mtime))
os.Format(DIRECTORY_MTIME "%lu\n",
(unsigned long)std::chrono::system_clock::to_time_t(directory.mtime));
os.Format("%s%s\n", DIRECTORY_BEGIN, directory.GetPath());
}
for (const auto &child : directory.children) {
if (child.IsMount())
continue;
os.Format(DIRECTORY_DIR "%s\n", child.GetName());
directory_save(os, child);
}
for (const auto &song : directory.songs)
song_save(os, song);
playlist_vector_save(os, directory.playlists);
if (!directory.IsRoot())
os.Format(DIRECTORY_END "%s\n", directory.GetPath());
}
static bool
ParseLine(Directory &directory, const char *line)
{
const char *p;
if ((p = StringAfterPrefix(line, DIRECTORY_MTIME))) {
const auto mtime = ParseUint64(p);
if (mtime > 0)
directory.mtime = std::chrono::system_clock::from_time_t(mtime);
} else if ((p = StringAfterPrefix(line, DIRECTORY_TYPE))) {
directory.device = ParseTypeString(p);
} else
return false;
return true;
}
static Directory *
directory_load_subdir(TextFile &file, Directory &parent, std::string_view name)
{
if (parent.FindChild(name) != nullptr)
throw FormatRuntimeError("Duplicate subdirectory '%.*s'",
int(name.size()), name.data());
Directory *directory = parent.CreateChild(name);
try {
while (true) {
const char *line = file.ReadLine();
if (line == nullptr)
throw std::runtime_error("Unexpected end of file");
if (StringStartsWith(line, DIRECTORY_BEGIN))
break;
if (!ParseLine(*directory, line))
throw FormatRuntimeError("Malformed line: %s", line);
}
directory_load(file, *directory);
} catch (...) {
directory->Delete();
throw;
}
return directory;
}
void
directory_load(TextFile &file, Directory &directory)
{
const char *line;
while ((line = file.ReadLine()) != nullptr &&
!StringStartsWith(line, DIRECTORY_END)) {
const char *p;
if ((p = StringAfterPrefix(line, DIRECTORY_DIR))) {
directory_load_subdir(file, directory, p);
} else if ((p = StringAfterPrefix(line, SONG_BEGIN))) {
const char *name = p;
if (directory.FindSong(name) != nullptr)
throw FormatRuntimeError("Duplicate song '%s'", name);
std::string target;
auto audio_format = AudioFormat::Undefined();
auto detached_song = song_load(file, name,
&target,
&audio_format);
auto song = std::make_unique<Song>(std::move(detached_song),
directory);
song->target = std::move(target);
song->audio_format = audio_format;
directory.AddSong(std::move(song));
} else if ((p = StringAfterPrefix(line, PLAYLIST_META_BEGIN))) {
const char *name = p;
playlist_metadata_load(file, directory.playlists, name);
} else {
throw FormatRuntimeError("Malformed line: %s", line);
}
}
}