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osu-lazer/osu.Game/Beatmaps/IO/OszArchiveReader.cs

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C#
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using System;
using System.IO;
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using System.Linq;
using Ionic.Zip;
using osu.Game.Beatmaps.Formats;
namespace osu.Game.Beatmaps.IO
{
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public sealed class OszArchiveReader : ArchiveReader
{
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public static void Register()
{
AddReader<OszArchiveReader>((storage, path) =>
{
using (var stream = storage.GetStream(path))
{
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if (!ZipFile.IsZipFile(stream, false))
return false;
using (ZipFile zip = ZipFile.Read(stream))
return zip.Entries.Any(e => e.FileName.EndsWith(".osu"));
}
});
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OsuLegacyDecoder.Register();
}
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private ZipFile archive { get; set; }
private string[] beatmaps { get; set; }
private Beatmap firstMap { get; set; }
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public OszArchiveReader(Stream archiveStream)
{
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archive = ZipFile.Read(archiveStream);
beatmaps = archive.Entries.Where(e => e.FileName.EndsWith(".osu"))
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.Select(e => e.FileName).ToArray();
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if (beatmaps.Length == 0)
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throw new FileNotFoundException("This directory contains no beatmaps");
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using (var stream = new StreamReader(ReadFile(beatmaps[0])))
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{
var decoder = BeatmapDecoder.GetDecoder(stream);
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firstMap = decoder.Decode(stream);
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}
}
public override string[] ReadBeatmaps()
{
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return beatmaps;
}
public override Stream ReadFile(string name)
{
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ZipEntry entry = archive.Entries.SingleOrDefault(e => e.FileName == name);
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if (entry == null)
throw new FileNotFoundException();
return entry.OpenReader();
}
public override BeatmapMetadata ReadMetadata()
{
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return firstMap.Metadata;
}
public override void Dispose()
{
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archive.Dispose();
}
}
}