mpd/src/PlaylistSong.cxx
Max Kellermann 322b061632 DetachedSong: fork of struct Song
From now on, struct Song will be used by the database only, and
DetachedSong will be used by everybody else.  DetachedSong is easier
to use, but Song has lower overhead.
2014-01-09 09:05:58 +01:00

182 lines
4.5 KiB
C++

/*
* Copyright (C) 2003-2013 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 "PlaylistSong.hxx"
#include "Mapper.hxx"
#include "DatabasePlugin.hxx"
#include "DatabaseGlue.hxx"
#include "ls.hxx"
#include "tag/Tag.hxx"
#include "tag/TagBuilder.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/Traits.hxx"
#include "util/UriUtil.hxx"
#include "util/Error.hxx"
#include "DetachedSong.hxx"
#include "Song.hxx"
#include <assert.h>
#include <string.h>
static void
merge_song_metadata(DetachedSong *dest, const DetachedSong *base,
const DetachedSong *add)
{
{
TagBuilder builder(add->GetTag());
builder.Complement(base->GetTag());
dest->SetTag(builder.Commit());
}
dest->SetLastModified(base->GetLastModified());
dest->SetStartMS(add->GetStartMS());
dest->SetEndMS(add->GetEndMS());
}
static DetachedSong *
apply_song_metadata(DetachedSong *dest, const DetachedSong *src)
{
DetachedSong *tmp;
assert(dest != nullptr);
assert(src != nullptr);
if (!src->GetTag().IsDefined() &&
src->GetStartMS() == 0 && src->GetEndMS() == 0)
return dest;
if (dest->IsInDatabase()) {
const auto path_fs = map_song_fs(*dest);
if (path_fs.IsNull())
return dest;
std::string path_utf8 = path_fs.ToUTF8();
if (path_utf8.empty())
path_utf8 = path_fs.c_str();
tmp = new DetachedSong(std::move(path_utf8));
merge_song_metadata(tmp, dest, src);
} else {
tmp = new DetachedSong(dest->GetURI());
merge_song_metadata(tmp, dest, src);
}
if (dest->GetTag().IsDefined() && dest->GetTag().time > 0 &&
src->GetStartMS() > 0 && src->GetEndMS() == 0 &&
src->GetStartMS() / 1000 < (unsigned)dest->GetTag().time)
/* the range is open-ended, and the playlist plugin
did not know the total length of the song file
(e.g. last track on a CUE file); fix it up here */
tmp->WritableTag().time =
dest->GetTag().time - src->GetStartMS() / 1000;
delete dest;
return tmp;
}
static DetachedSong *
playlist_check_load_song(const DetachedSong *song, const char *uri, bool secure)
{
DetachedSong *dest;
if (uri_has_scheme(uri)) {
dest = new DetachedSong(uri);
} else if (PathTraitsUTF8::IsAbsolute(uri) && secure) {
Song *tmp = Song::LoadFile(uri, nullptr);
if (tmp == nullptr)
return nullptr;
dest = new DetachedSong(*tmp);
delete tmp;
} else {
const Database *db = GetDatabase();
if (db == nullptr)
return nullptr;
Song *tmp = db->GetSong(uri, IgnoreError());
if (tmp == nullptr)
/* not found in database */
return nullptr;
dest = new DetachedSong(*tmp);
db->ReturnSong(tmp);
}
return apply_song_metadata(dest, song);
}
DetachedSong *
playlist_check_translate_song(DetachedSong *song, const char *base_uri,
bool secure)
{
if (song->IsInDatabase())
/* already ok */
return song;
const char *uri = song->GetURI();
if (uri_has_scheme(uri)) {
if (uri_supported_scheme(uri))
/* valid remote song */
return song;
else {
/* unsupported remote song */
delete song;
return nullptr;
}
}
if (base_uri != nullptr && strcmp(base_uri, ".") == 0)
/* PathTraitsUTF8::GetParent() returns "." when there
is no directory name in the given path; clear that
now, because it would break the database lookup
functions */
base_uri = nullptr;
if (PathTraitsUTF8::IsAbsolute(uri)) {
/* XXX fs_charset vs utf8? */
const char *suffix = map_to_relative_path(uri);
assert(suffix != nullptr);
if (suffix != uri)
uri = suffix;
else if (!secure) {
/* local files must be relative to the music
directory when "secure" is enabled */
delete song;
return nullptr;
}
base_uri = nullptr;
}
std::string full_uri;
if (base_uri != nullptr) {
full_uri = PathTraitsUTF8::Build(base_uri, uri);
uri = full_uri.c_str();
}
DetachedSong *dest = playlist_check_load_song(song, uri, secure);
delete song;
return dest;
}