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osu-lazer/osu.Game/IO/Archives/ZipArchiveReader.cs

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2018-04-13 17:19:50 +08:00
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System.Collections.Generic;
using System.IO;
using System.Linq;
using SharpCompress.Archives.Zip;
namespace osu.Game.IO.Archives
{
public sealed class ZipArchiveReader : ArchiveReader
{
private readonly Stream archiveStream;
private readonly ZipArchive archive;
public ZipArchiveReader(Stream archiveStream, string name = null)
: base(name)
{
this.archiveStream = archiveStream;
archive = ZipArchive.Open(archiveStream);
}
public override Stream GetStream(string name)
{
ZipArchiveEntry entry = archive.Entries.SingleOrDefault(e => e.Key == name);
if (entry == null)
throw new FileNotFoundException();
// allow seeking
MemoryStream copy = new MemoryStream();
using (Stream s = entry.OpenEntryStream())
s.CopyTo(copy);
copy.Position = 0;
return copy;
}
public override void Dispose()
{
archive.Dispose();
archiveStream.Dispose();
}
public override IEnumerable<string> Filenames => archive.Entries.Select(e => e.Key).ToArray();
public override Stream GetUnderlyingStream() => archiveStream;
}
}