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using System;
using System.IO;
#if GZIP
using SharpCompress.Archive.GZip;
#endif
#if RAR
using SharpCompress.Archive.Rar;
#endif
#if TAR
using SharpCompress.Archive.Tar;
#endif
using SharpCompress.Archive.Zip;
using SharpCompress.Common;
using SharpCompress.Compressor;
#if BZIP2
using SharpCompress.Compressor.BZip2;
#endif
using SharpCompress.IO;
#if GZIP
using SharpCompress.Reader.GZip;
#endif
#if RAR
using SharpCompress.Reader.Rar;
#endif
#if TAR
using SharpCompress.Reader.Tar;
#endif
using SharpCompress.Reader.Zip;
#if DEFLATE
using GZipStream = SharpCompress.Compressor.Deflate.GZipStream;
#endif
namespace SharpCompress.Reader
{
internal static class ReaderFactory
{
/// <summary>
/// Opens a Reader for Non-seeking usage
/// </summary>
/// <param name="stream"></param>
/// <param name="options"></param>
/// <returns></returns>
public static IReader Open(Stream stream, Options options = Options.KeepStreamsOpen)
{
stream.CheckNotNull("stream");
RewindableStream rewindableStream = new RewindableStream(stream);
rewindableStream.StartRecording();
if (ZipArchive.IsZipFile(rewindableStream, null))
{
rewindableStream.Rewind(true);
return ZipReader.Open(rewindableStream, null, options);
}
#if GZIP
rewindableStream.Rewind(false);
if (GZipArchive.IsGZipFile(rewindableStream))
{
rewindableStream.Rewind(false);
GZipStream testStream = new GZipStream(rewindableStream, CompressionMode.Decompress);
if (TarArchive.IsTarFile(testStream))
{
rewindableStream.Rewind(true);
return new TarReader(rewindableStream, CompressionType.GZip, options);
}
rewindableStream.Rewind(true);
return GZipReader.Open(rewindableStream, options);
}
#endif
#if BZIP2
rewindableStream.Rewind(false);
if (BZip2Stream.IsBZip2(rewindableStream))
{
rewindableStream.Rewind(false);
BZip2Stream testStream = new BZip2Stream(rewindableStream, CompressionMode.Decompress, false);
#if TAR
if (TarArchive.IsTarFile(testStream))
{
rewindableStream.Rewind(true);
return new TarReader(rewindableStream, CompressionType.BZip2, options);
}
#endif
}
#endif
#if TAR
rewindableStream.Rewind(false);
if (TarArchive.IsTarFile(rewindableStream))
{
rewindableStream.Rewind(true);
return TarReader.Open(rewindableStream, options);
}
#endif
#if RAR
rewindableStream.Rewind(false);
if (RarArchive.IsRarFile(rewindableStream, options))
{
rewindableStream.Rewind(true);
return RarReader.Open(rewindableStream, options);
}
#endif
throw new InvalidOperationException("Cannot determine compressed stream type. Supported Reader Formats: Zip, GZip, BZip2, Tar, Rar");
}
}
}
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