mirror of
https://github.com/ppy/osu.git
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160 lines
6.4 KiB
C#
160 lines
6.4 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.IO;
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using System.Linq;
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using System.Text;
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using osu.Framework.Extensions;
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using osu.Game.Beatmaps;
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using osu.Game.Beatmaps.Formats;
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using osu.Game.Extensions;
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using osu.Game.IO.Legacy;
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using osu.Game.Replays.Legacy;
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using osu.Game.Rulesets.Replays;
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using osu.Game.Rulesets.Replays.Types;
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using SharpCompress.Compressors.LZMA;
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namespace osu.Game.Scoring.Legacy
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{
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public class LegacyScoreEncoder
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{
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/// <summary>
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/// Database version in stable-compatible YYYYMMDD format.
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/// Should be incremented if any changes are made to the format/usage.
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/// </summary>
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public const int LATEST_VERSION = FIRST_LAZER_VERSION;
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/// <summary>
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/// The first stable-compatible YYYYMMDD format version given to lazer usage of replays.
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/// </summary>
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public const int FIRST_LAZER_VERSION = 30000000;
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private readonly Score score;
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private readonly IBeatmap? beatmap;
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/// <summary>
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/// Create a new score encoder for a specific score.
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/// </summary>
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/// <param name="score">The score to be encoded.</param>
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/// <param name="beatmap">The beatmap used to convert frames for the score. May be null if the frames are already <see cref="LegacyReplayFrame"/>s.</param>
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/// <exception cref="ArgumentException"></exception>
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public LegacyScoreEncoder(Score score, IBeatmap? beatmap)
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{
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this.score = score;
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this.beatmap = beatmap;
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if (beatmap == null && !score.Replay.Frames.All(f => f is LegacyReplayFrame))
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throw new ArgumentException(@"Beatmap must be provided if frames are not already legacy frames.", nameof(beatmap));
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if (!score.ScoreInfo.Ruleset.IsLegacyRuleset())
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throw new ArgumentException(@"Only scores in the osu, taiko, catch, or mania rulesets can be encoded to the legacy score format.", nameof(score));
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}
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public void Encode(Stream stream)
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{
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using (SerializationWriter sw = new SerializationWriter(stream))
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{
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sw.Write((byte)(score.ScoreInfo.Ruleset.OnlineID));
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sw.Write(LATEST_VERSION);
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sw.Write(score.ScoreInfo.BeatmapInfo.MD5Hash);
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sw.Write(score.ScoreInfo.User.Username);
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sw.Write(FormattableString.Invariant($"lazer-{score.ScoreInfo.User.Username}-{score.ScoreInfo.Date}").ComputeMD5Hash());
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sw.Write((ushort)(score.ScoreInfo.GetCount300() ?? 0));
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sw.Write((ushort)(score.ScoreInfo.GetCount100() ?? 0));
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sw.Write((ushort)(score.ScoreInfo.GetCount50() ?? 0));
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sw.Write((ushort)(score.ScoreInfo.GetCountGeki() ?? 0));
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sw.Write((ushort)(score.ScoreInfo.GetCountKatu() ?? 0));
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sw.Write((ushort)(score.ScoreInfo.GetCountMiss() ?? 0));
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sw.Write((int)(score.ScoreInfo.TotalScore));
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sw.Write((ushort)score.ScoreInfo.MaxCombo);
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sw.Write(score.ScoreInfo.Combo == score.ScoreInfo.MaxCombo);
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sw.Write((int)score.ScoreInfo.Ruleset.CreateInstance().ConvertToLegacyMods(score.ScoreInfo.Mods));
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sw.Write(getHpGraphFormatted());
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sw.Write(score.ScoreInfo.Date.DateTime);
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sw.WriteByteArray(createReplayData());
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sw.Write((long)0);
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writeModSpecificData(score.ScoreInfo, sw);
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}
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}
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private void writeModSpecificData(ScoreInfo score, SerializationWriter sw)
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{
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}
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private byte[] createReplayData()
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{
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byte[] content = new ASCIIEncoding().GetBytes(replayStringContent);
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using (var outStream = new MemoryStream())
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{
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using (var lzma = new LzmaStream(new LzmaEncoderProperties(false, 1 << 21, 255), false, outStream))
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{
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outStream.Write(lzma.Properties);
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long fileSize = content.Length;
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for (int i = 0; i < 8; i++)
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outStream.WriteByte((byte)(fileSize >> (8 * i)));
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lzma.Write(content);
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}
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return outStream.ToArray();
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}
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}
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private string replayStringContent
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{
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get
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{
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StringBuilder replayData = new StringBuilder();
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// As this is baked into hitobject timing (see `LegacyBeatmapDecoder`) we also need to apply this to replay frame timing.
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double offset = beatmap?.BeatmapInfo.BeatmapVersion < 5 ? -LegacyBeatmapDecoder.EARLY_VERSION_TIMING_OFFSET : 0;
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if (score.Replay != null)
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{
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int lastTime = 0;
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foreach (var f in score.Replay.Frames)
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{
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var legacyFrame = getLegacyFrame(f);
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// Rounding because stable could only parse integral values
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int time = (int)Math.Round(legacyFrame.Time + offset);
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replayData.Append(FormattableString.Invariant($"{time - lastTime}|{legacyFrame.MouseX ?? 0}|{legacyFrame.MouseY ?? 0}|{(int)legacyFrame.ButtonState},"));
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lastTime = time;
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}
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}
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// Warning: this is purposefully hardcoded as a string rather than interpolating, as in some cultures the minus sign is not encoded as the standard ASCII U+00C2 codepoint,
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// which then would break decoding.
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replayData.Append(@"-12345|0|0|0");
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return replayData.ToString();
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}
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}
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private LegacyReplayFrame getLegacyFrame(ReplayFrame replayFrame)
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{
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switch (replayFrame)
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{
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case LegacyReplayFrame legacyFrame:
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return legacyFrame;
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case IConvertibleReplayFrame convertibleFrame:
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return convertibleFrame.ToLegacy(beatmap);
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default:
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throw new ArgumentException(@"Frame could not be converted to legacy frames", nameof(replayFrame));
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}
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}
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private string getHpGraphFormatted()
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{
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// todo: implement, maybe?
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return string.Empty;
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}
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}
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}
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