コード例 #1
0
ファイル: BeatmapManager.cs プロジェクト: felixchong98/osu
        protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));

            if (string.IsNullOrEmpty(mapName))
            {
                // Todo: This is temporary for debugging purposes
                var files = reader.Filenames.ToList();
                throw new InvalidOperationException($"No beatmap files found in this beatmap archive. Files ({files.Count}): {string.Join(", ", files)}");
            }

            Beatmap beatmap;

            using (var stream = new StreamReader(reader.GetStream(mapName)))
                beatmap = Decoder.GetDecoder <Beatmap>(stream).Decode(stream);

            return(new BeatmapSetInfo
            {
                OnlineBeatmapSetID = beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID,
                Beatmaps = new List <BeatmapInfo>(),
                Hash = computeBeatmapSetHash(reader),
                Metadata = beatmap.Metadata
            });
        }
コード例 #2
0
        protected override BeatmapSetInfo?CreateModel(ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string?mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu", StringComparison.OrdinalIgnoreCase));

            if (string.IsNullOrEmpty(mapName))
            {
                Logger.Log($"No beatmap files found in the beatmap archive ({reader.Name}).", LoggingTarget.Database);
                return(null);
            }

            Beatmap beatmap;

            using (var stream = new LineBufferedReader(reader.GetStream(mapName)))
            {
                if (stream.PeekLine() == null)
                {
                    Logger.Log($"No content found in first .osu file of beatmap archive ({reader.Name} / {mapName})", LoggingTarget.Database);
                    return(null);
                }

                beatmap = Decoder.GetDecoder <Beatmap>(stream).Decode(stream);
            }

            return(new BeatmapSetInfo
            {
                OnlineID = beatmap.BeatmapInfo.BeatmapSet?.OnlineID ?? -1,
                // Metadata = beatmap.Metadata,
                DateAdded = DateTimeOffset.UtcNow
            });
        }
コード例 #3
0
ファイル: BeatmapManager.cs プロジェクト: vuduclong0309/osu
        /// <summary>
        /// Create all required <see cref="BeatmapInfo"/>s for the provided archive.
        /// </summary>
        private List <BeatmapInfo> createBeatmapDifficulties(ArchiveReader reader)
        {
            var beatmapInfos = new List <BeatmapInfo>();

            foreach (var name in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (var raw = reader.GetStream(name))
                    using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                        using (var sr = new StreamReader(ms))
                        {
                            raw.CopyTo(ms);
                            ms.Position = 0;

                            var      decoder = Decoder.GetDecoder <Beatmap>(sr);
                            IBeatmap beatmap = decoder.Decode(sr);

                            beatmap.BeatmapInfo.Path    = name;
                            beatmap.BeatmapInfo.Hash    = ms.ComputeSHA2Hash();
                            beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();

                            var ruleset = rulesets.GetRuleset(beatmap.BeatmapInfo.RulesetID);
                            beatmap.BeatmapInfo.Ruleset = ruleset;
                            // TODO: this should be done in a better place once we actually need to dynamically update it.
                            beatmap.BeatmapInfo.StarDifficulty = ruleset?.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating ?? 0;

                            beatmapInfos.Add(beatmap.BeatmapInfo);
                        }
            }

            return(beatmapInfos);
        }
コード例 #4
0
        /// <summary>
        /// Create a SHA-2 hash from the provided archive based on file content of all files matching <see cref="HashableFileTypes"/>.
        /// </summary>
        private string computeHash(ArchiveReader reader)
        {
            // for now, concatenate all .osu files in the set to create a unique hash.
            MemoryStream hashable = new MemoryStream();

            foreach (string file in reader.Filenames.Where(f => HashableFileTypes.Any(f.EndsWith)))
            {
                using (Stream s = reader.GetStream(file))
                    s.CopyTo(hashable);
            }

            return(hashable.Length > 0 ? hashable.ComputeSHA2Hash() : null);
        }
コード例 #5
0
        /// <summary>
        /// Create a SHA-2 hash from the provided archive based on contained beatmap (.osu) file content.
        /// </summary>
        private string computeBeatmapSetHash(ArchiveReader reader)
        {
            // for now, concatenate all .osu files in the set to create a unique hash.
            MemoryStream hashable = new MemoryStream();

            foreach (string file in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (Stream s = reader.GetStream(file))
                    s.CopyTo(hashable);
            }

            return(hashable.ComputeSHA2Hash());
        }
コード例 #6
0
ファイル: BeatmapManager.cs プロジェクト: changeGithub/osu
        /// <summary>
        /// Create all required <see cref="BeatmapInfo"/>s for the provided archive.
        /// </summary>
        private List <BeatmapInfo> createBeatmapDifficulties(BeatmapSetInfo model, ArchiveReader reader)
        {
            var beatmapInfos = new List <BeatmapInfo>();

            foreach (var name in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (var raw = reader.GetStream(name))
                    using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                        using (var sr = new StreamReader(ms))
                        {
                            raw.CopyTo(ms);
                            ms.Position = 0;

                            var      decoder = Decoder.GetDecoder <Beatmap>(sr);
                            IBeatmap beatmap = decoder.Decode(sr);

                            beatmap.BeatmapInfo.Path    = name;
                            beatmap.BeatmapInfo.Hash    = ms.ComputeSHA2Hash();
                            beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();

                            // ensure we have the same online set ID as the set itself.
                            beatmap.BeatmapInfo.OnlineBeatmapSetID          = model.OnlineBeatmapSetID;
                            beatmap.BeatmapInfo.Metadata.OnlineBeatmapSetID = model.OnlineBeatmapSetID;

                            // check that no existing beatmap exists that is imported with the same online beatmap ID. if so, give it precedence.
                            if (beatmap.BeatmapInfo.OnlineBeatmapID.HasValue && QueryBeatmap(b => b.OnlineBeatmapID.Value == beatmap.BeatmapInfo.OnlineBeatmapID.Value) != null)
                            {
                                beatmap.BeatmapInfo.OnlineBeatmapID = null;
                            }

                            RulesetInfo ruleset = rulesets.GetRuleset(beatmap.BeatmapInfo.RulesetID);

                            beatmap.BeatmapInfo.Ruleset = ruleset;

                            if (ruleset != null)
                            {
                                // TODO: this should be done in a better place once we actually need to dynamically update it.
                                var converted = new DummyConversionBeatmap(beatmap).GetPlayableBeatmap(ruleset);
                                beatmap.BeatmapInfo.StarDifficulty = ruleset.CreateInstance().CreateDifficultyCalculator(converted).Calculate();
                            }
                            else
                            {
                                beatmap.BeatmapInfo.StarDifficulty = 0;
                            }

                            beatmapInfos.Add(beatmap.BeatmapInfo);
                        }
            }

            return(beatmapInfos);
        }
コード例 #7
0
ファイル: ScoreImporter.cs プロジェクト: Wieku/osu
 protected override ScoreInfo?CreateModel(ArchiveReader archive)
 {
     using (var stream = archive.GetStream(archive.Filenames.First(f => f.EndsWith(".osr", StringComparison.OrdinalIgnoreCase))))
     {
         try
         {
             return(new DatabasedLegacyScoreDecoder(rulesets, beatmaps()).Parse(stream).ScoreInfo);
         }
         catch (LegacyScoreDecoder.BeatmapNotFoundException e)
         {
             Logger.Log(e.Message, LoggingTarget.Information, LogLevel.Error);
             return(null);
         }
     }
 }
コード例 #8
0
        private List <RealmNamedFileUsage> createFileInfos(ArchiveReader reader, RealmFileStore files, Realm realm)
        {
            var fileInfos = new List <RealmNamedFileUsage>();

            // import files to manager
            foreach (var filenames in getShortenedFilenames(reader))
            {
                using (Stream s = reader.GetStream(filenames.original))
                {
                    var item = new RealmNamedFileUsage(files.Add(s, realm), filenames.shortened);
                    fileInfos.Add(item);
                }
            }

            return(fileInfos);
        }
コード例 #9
0
        private string computeHashFast(ArchiveReader reader)
        {
            MemoryStream hashable = new MemoryStream();

            foreach (string?file in reader.Filenames.Where(f => HashableFileTypes.Any(ext => f.EndsWith(ext, StringComparison.OrdinalIgnoreCase))).OrderBy(f => f))
            {
                using (Stream s = reader.GetStream(file))
                    s.CopyTo(hashable);
            }

            if (hashable.Length > 0)
            {
                return(hashable.ComputeSHA2Hash());
            }

            return(reader.Name.ComputeSHA2Hash());
        }
コード例 #10
0
        /// <summary>
        /// Create all required <see cref="FileInfo"/>s for the provided archive, adding them to the global file store.
        /// </summary>
        private List <BeatmapSetFileInfo> createFileInfos(ArchiveReader reader, FileStore files)
        {
            List <BeatmapSetFileInfo> fileInfos = new List <BeatmapSetFileInfo>();

            // import files to manager
            foreach (string file in reader.Filenames)
            {
                using (Stream s = reader.GetStream(file))
                    fileInfos.Add(new BeatmapSetFileInfo
                    {
                        Filename = file,
                        FileInfo = files.Add(s)
                    });
            }

            return(fileInfos);
        }
コード例 #11
0
ファイル: ArchiveModelManager.cs プロジェクト: internoQQ/osu
        /// <summary>
        /// Create all required <see cref="FileInfo"/>s for the provided archive, adding them to the global file store.
        /// </summary>
        private List <TFileModel> createFileInfos(ArchiveReader reader, FileStore files)
        {
            var fileInfos = new List <TFileModel>();

            // import files to manager
            foreach (string file in reader.Filenames)
            {
                using (Stream s = reader.GetStream(file))
                    fileInfos.Add(new TFileModel
                    {
                        Filename = FileSafety.PathStandardise(file),
                        FileInfo = files.Add(s)
                    });
            }

            return(fileInfos);
        }
コード例 #12
0
ファイル: ScoreManager.cs プロジェクト: yazici/osu
        protected override ScoreInfo CreateModel(ArchiveReader archive)
        {
            if (archive == null)
            {
                return(null);
            }

            using (var stream = archive.GetStream(archive.Filenames.First(f => f.EndsWith(".osr"))))
            {
                try
                {
                    return(new DatabasedLegacyScoreParser(rulesets, beatmaps).Parse(stream).ScoreInfo);
                }
                catch (LegacyScoreParser.BeatmapNotFoundException e)
                {
                    Logger.Log(e.Message, LoggingTarget.Information, LogLevel.Error);
                    return(null);
                }
            }
        }
コード例 #13
0
ファイル: BeatmapManager.cs プロジェクト: changeGithub/osu
        protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));

            if (string.IsNullOrEmpty(mapName))
            {
                throw new InvalidOperationException("No beatmap files found in this beatmap archive.");
            }

            BeatmapMetadata metadata;

            using (var stream = new StreamReader(reader.GetStream(mapName)))
                metadata = Decoder.GetDecoder <Beatmap>(stream).Decode(stream).Metadata;

            return(new BeatmapSetInfo
            {
                OnlineBeatmapSetID = metadata.OnlineBeatmapSetID,
                Beatmaps = new List <BeatmapInfo>(),
                Hash = computeBeatmapSetHash(reader),
                Metadata = metadata
            });
        }
コード例 #14
0
ファイル: BeatmapManager.cs プロジェクト: vuduclong0309/osu
        protected override BeatmapSetInfo CreateModel(ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));

            if (string.IsNullOrEmpty(mapName))
            {
                Logger.Log($"No beatmap files found in the beatmap archive ({reader.Name}).", LoggingTarget.Database);
                return(null);
            }

            Beatmap beatmap;

            using (var stream = new StreamReader(reader.GetStream(mapName)))
                beatmap = Decoder.GetDecoder <Beatmap>(stream).Decode(stream);

            return(new BeatmapSetInfo
            {
                OnlineBeatmapSetID = beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID,
                Beatmaps = new List <BeatmapInfo>(),
                Metadata = beatmap.Metadata,
            });
        }
コード例 #15
0
ファイル: BeatmapDatabase.cs プロジェクト: YuuWaffl/osu
        private BeatmapSetInfo getBeatmapSet(ArchiveReader archiveReader)
        {
            BeatmapMetadata metadata;

            using (var stream = new StreamReader(archiveReader.GetStream(archiveReader.BeatmapFilenames[0])))
                metadata = BeatmapDecoder.GetDecoder(stream).Decode(stream).Metadata;

            string hash;
            string path;

            using (var input = archiveReader.GetUnderlyingStream())
            {
                hash = input.GetMd5Hash();
                input.Seek(0, SeekOrigin.Begin);
                path = Path.Combine(@"beatmaps", hash.Remove(1), hash.Remove(2), hash);
                if (!Storage.Exists(path))
                {
                    using (var output = Storage.GetStream(path, FileAccess.Write))
                        input.CopyTo(output);
                }
            }

            var existing = Connection.Table <BeatmapSetInfo>().FirstOrDefault(b => b.Hash == hash);

            if (existing != null)
            {
                GetChildren(existing);

                if (existing.DeletePending)
                {
                    existing.DeletePending = false;
                    Update(existing, false);
                    BeatmapSetAdded?.Invoke(existing);
                }

                return(existing);
            }

            var beatmapSet = new BeatmapSetInfo
            {
                OnlineBeatmapSetID = metadata.OnlineBeatmapSetID,
                Beatmaps           = new List <BeatmapInfo>(),
                Path     = path,
                Hash     = hash,
                Metadata = metadata
            };

            using (var archive = ArchiveReader.GetReader(Storage, path))
            {
                string[] mapNames = archive.BeatmapFilenames;
                foreach (var name in mapNames)
                {
                    using (var raw = archive.GetStream(name))
                        using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                            using (var sr = new StreamReader(ms))
                            {
                                raw.CopyTo(ms);
                                ms.Position = 0;

                                var     decoder = BeatmapDecoder.GetDecoder(sr);
                                Beatmap beatmap = decoder.Decode(sr);

                                beatmap.BeatmapInfo.Path = name;
                                beatmap.BeatmapInfo.Hash = ms.GetMd5Hash();

                                // TODO: Diff beatmap metadata with set metadata and leave it here if necessary
                                beatmap.BeatmapInfo.Metadata = null;

                                // TODO: this should be done in a better place once we actually need to dynamically update it.
                                beatmap.BeatmapInfo.Ruleset        = rulesets.Query <RulesetInfo>().FirstOrDefault(r => r.ID == beatmap.BeatmapInfo.RulesetID);
                                beatmap.BeatmapInfo.StarDifficulty = rulesets.Query <RulesetInfo>().FirstOrDefault(r => r.ID == beatmap.BeatmapInfo.RulesetID)?.CreateInstance()?.CreateDifficultyCalculator(beatmap).Calculate() ?? 0;

                                beatmapSet.Beatmaps.Add(beatmap.BeatmapInfo);
                            }
                }
                beatmapSet.StoryboardFile = archive.StoryboardFilename;
            }

            return(beatmapSet);
        }
コード例 #16
0
        /// <summary>
        /// Create all required <see cref="BeatmapInfo"/>s for the provided archive.
        /// </summary>
        private List <BeatmapInfo> createBeatmapDifficulties(ArchiveReader reader)
        {
            var beatmapInfos = new List <BeatmapInfo>();

            bool invalidateOnlineIDs = false;

            foreach (var name in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (var raw = reader.GetStream(name))
                    using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                        using (var sr = new StreamReader(ms))
                        {
                            raw.CopyTo(ms);
                            ms.Position = 0;

                            var      decoder = Decoder.GetDecoder <Beatmap>(sr);
                            IBeatmap beatmap = decoder.Decode(sr);

                            beatmap.BeatmapInfo.Path    = name;
                            beatmap.BeatmapInfo.Hash    = ms.ComputeSHA2Hash();
                            beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();

                            if (beatmap.BeatmapInfo.OnlineBeatmapID.HasValue)
                            {
                                var ourId = beatmap.BeatmapInfo.OnlineBeatmapID;

                                // check that no existing beatmap in database exists that is imported with the same online beatmap ID. if so, give it precedence.
                                if (QueryBeatmap(b => b.OnlineBeatmapID.Value == ourId) != null)
                                {
                                    beatmap.BeatmapInfo.OnlineBeatmapID = null;
                                }

                                // check that no other beatmap in this imported set has a conflicting online beatmap ID. If so, presume *all* are incorrect.
                                if (beatmapInfos.Any(b => b.OnlineBeatmapID == ourId))
                                {
                                    invalidateOnlineIDs = true;
                                }
                            }

                            RulesetInfo ruleset = rulesets.GetRuleset(beatmap.BeatmapInfo.RulesetID);

                            beatmap.BeatmapInfo.Ruleset = ruleset;

                            if (ruleset != null)
                            {
                                // TODO: this should be done in a better place once we actually need to dynamically update it.
                                beatmap.BeatmapInfo.StarDifficulty = ruleset.CreateInstance().CreateDifficultyCalculator(new DummyConversionBeatmap(beatmap)).Calculate().StarRating;
                            }
                            else
                            {
                                beatmap.BeatmapInfo.StarDifficulty = 0;
                            }

                            beatmapInfos.Add(beatmap.BeatmapInfo);
                        }
            }

            if (invalidateOnlineIDs)
            {
                beatmapInfos.ForEach(b => b.OnlineBeatmapID = null);
            }

            return(beatmapInfos);
        }
コード例 #17
0
        /// <summary>
        /// Import a beamap into our local <see cref="FileStore"/> storage.
        /// If the beatmap is already imported, the existing instance will be returned.
        /// </summary>
        /// <param name="files">The store to import beatmap files to.</param>
        /// <param name="beatmaps">The store to import beatmaps to.</param>
        /// <param name="reader">The beatmap archive to be read.</param>
        /// <returns>The imported beatmap, or an existing instance if it is already present.</returns>
        private BeatmapSetInfo importToStorage(FileStore files, BeatmapStore beatmaps, ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));

            if (string.IsNullOrEmpty(mapName))
            {
                throw new InvalidOperationException("No beatmap files found in the map folder.");
            }

            // for now, concatenate all .osu files in the set to create a unique hash.
            MemoryStream hashable = new MemoryStream();

            foreach (string file in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (Stream s = reader.GetStream(file))
                    s.CopyTo(hashable);
            }

            var hash = hashable.ComputeSHA2Hash();

            // check if this beatmap has already been imported and exit early if so.
            var beatmapSet = beatmaps.BeatmapSets.FirstOrDefault(b => b.Hash == hash);

            if (beatmapSet != null)
            {
                undelete(beatmaps, files, beatmapSet);

                // ensure all files are present and accessible
                foreach (var f in beatmapSet.Files)
                {
                    if (!storage.Exists(f.FileInfo.StoragePath))
                    {
                        using (Stream s = reader.GetStream(f.Filename))
                            files.Add(s, false);
                    }
                }

                // todo: delete any files which shouldn't exist any more.

                return(beatmapSet);
            }

            List <BeatmapSetFileInfo> fileInfos = new List <BeatmapSetFileInfo>();

            // import files to manager
            foreach (string file in reader.Filenames)
            {
                using (Stream s = reader.GetStream(file))
                    fileInfos.Add(new BeatmapSetFileInfo
                    {
                        Filename = file,
                        FileInfo = files.Add(s)
                    });
            }

            BeatmapMetadata metadata;

            using (var stream = new StreamReader(reader.GetStream(mapName)))
                metadata = Decoder.GetDecoder(stream).DecodeBeatmap(stream).Metadata;


            // check if a set already exists with the same online id.
            if (metadata.OnlineBeatmapSetID != null)
            {
                beatmapSet = beatmaps.BeatmapSets.FirstOrDefault(b => b.OnlineBeatmapSetID == metadata.OnlineBeatmapSetID);
            }

            if (beatmapSet == null)
            {
                beatmapSet = new BeatmapSetInfo
                {
                    OnlineBeatmapSetID = metadata.OnlineBeatmapSetID,
                    Beatmaps           = new List <BeatmapInfo>(),
                    Hash     = hash,
                    Files    = fileInfos,
                    Metadata = metadata
                }
            }
            ;


            var mapNames = reader.Filenames.Where(f => f.EndsWith(".osu"));

            foreach (var name in mapNames)
            {
                using (var raw = reader.GetStream(name))
                    using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                        using (var sr = new StreamReader(ms))
                        {
                            raw.CopyTo(ms);
                            ms.Position = 0;

                            var     decoder = Decoder.GetDecoder(sr);
                            Beatmap beatmap = decoder.DecodeBeatmap(sr);

                            beatmap.BeatmapInfo.Path    = name;
                            beatmap.BeatmapInfo.Hash    = ms.ComputeSHA2Hash();
                            beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();

                            var existing = beatmaps.Beatmaps.FirstOrDefault(b => b.Hash == beatmap.BeatmapInfo.Hash || beatmap.BeatmapInfo.OnlineBeatmapID != null && b.OnlineBeatmapID == beatmap.BeatmapInfo.OnlineBeatmapID);

                            if (existing == null)
                            {
                                // Exclude beatmap-metadata if it's equal to beatmapset-metadata
                                if (metadata.Equals(beatmap.Metadata))
                                {
                                    beatmap.BeatmapInfo.Metadata = null;
                                }

                                RulesetInfo ruleset = rulesets.GetRuleset(beatmap.BeatmapInfo.RulesetID);

                                // TODO: this should be done in a better place once we actually need to dynamically update it.
                                beatmap.BeatmapInfo.Ruleset        = ruleset;
                                beatmap.BeatmapInfo.StarDifficulty = ruleset?.CreateInstance()?.CreateDifficultyCalculator(beatmap).Calculate() ?? 0;

                                beatmapSet.Beatmaps.Add(beatmap.BeatmapInfo);
                            }
                        }
            }

            return(beatmapSet);
        }
コード例 #18
0
        /// <summary>
        /// Import a beamap into our local <see cref="FileStore"/> storage.
        /// If the beatmap is already imported, the existing instance will be returned.
        /// </summary>
        /// <param name="reader">The beatmap archive to be read.</param>
        /// <returns>The imported beatmap, or an existing instance if it is already present.</returns>
        private BeatmapSetInfo importToStorage(ArchiveReader reader)
        {
            // let's make sure there are actually .osu files to import.
            string mapName = reader.Filenames.FirstOrDefault(f => f.EndsWith(".osu"));

            if (string.IsNullOrEmpty(mapName))
            {
                throw new InvalidOperationException("No beatmap files found in the map folder.");
            }

            // for now, concatenate all .osu files in the set to create a unique hash.
            MemoryStream hashable = new MemoryStream();

            foreach (string file in reader.Filenames.Where(f => f.EndsWith(".osu")))
            {
                using (Stream s = reader.GetStream(file))
                    s.CopyTo(hashable);
            }

            var hash = hashable.ComputeSHA2Hash();

            // check if this beatmap has already been imported and exit early if so.
            BeatmapSetInfo beatmapSet;

            lock (beatmaps)
                beatmapSet = beatmaps.QueryAndPopulate <BeatmapSetInfo>(b => b.Hash == hash).FirstOrDefault();

            if (beatmapSet != null)
            {
                Undelete(beatmapSet);
                return(beatmapSet);
            }

            List <BeatmapSetFileInfo> fileInfos = new List <BeatmapSetFileInfo>();

            // import files to manager
            foreach (string file in reader.Filenames)
            {
                using (Stream s = reader.GetStream(file))
                    fileInfos.Add(new BeatmapSetFileInfo
                    {
                        Filename = file,
                        FileInfo = files.Add(s)
                    });
            }

            BeatmapMetadata metadata;

            using (var stream = new StreamReader(reader.GetStream(mapName)))
                metadata = BeatmapDecoder.GetDecoder(stream).Decode(stream).Metadata;

            beatmapSet = new BeatmapSetInfo
            {
                OnlineBeatmapSetID = metadata.OnlineBeatmapSetID,
                Beatmaps           = new List <BeatmapInfo>(),
                Hash     = hash,
                Files    = fileInfos,
                Metadata = metadata
            };

            var mapNames = reader.Filenames.Where(f => f.EndsWith(".osu"));

            foreach (var name in mapNames)
            {
                using (var raw = reader.GetStream(name))
                    using (var ms = new MemoryStream()) //we need a memory stream so we can seek and shit
                        using (var sr = new StreamReader(ms))
                        {
                            raw.CopyTo(ms);
                            ms.Position = 0;

                            var     decoder = BeatmapDecoder.GetDecoder(sr);
                            Beatmap beatmap = decoder.Decode(sr);

                            beatmap.BeatmapInfo.Path    = name;
                            beatmap.BeatmapInfo.Hash    = ms.ComputeSHA2Hash();
                            beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();

                            // TODO: Diff beatmap metadata with set metadata and leave it here if necessary
                            beatmap.BeatmapInfo.Metadata = null;

                            // TODO: this should be done in a better place once we actually need to dynamically update it.
                            beatmap.BeatmapInfo.Ruleset        = rulesets.Query <RulesetInfo>().FirstOrDefault(r => r.ID == beatmap.BeatmapInfo.RulesetID);
                            beatmap.BeatmapInfo.StarDifficulty = rulesets.Query <RulesetInfo>().FirstOrDefault(r => r.ID == beatmap.BeatmapInfo.RulesetID)?.CreateInstance()?.CreateDifficultyCalculator(beatmap)
                                                                 .Calculate() ?? 0;

                            beatmapSet.Beatmaps.Add(beatmap.BeatmapInfo);
                        }
            }

            return(beatmapSet);
        }