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using System;
using System.IO;
using System.IO.Compression;
using SharpCompress.Common.Zip.Headers;
using SharpCompress.IO;
namespace SharpCompress.Common.Zip
{
internal class StreamingZipFilePart : ZipFilePart
{
private Stream decompressionStream;
internal StreamingZipFilePart(ZipFileEntry header, Stream stream)
: base(header, stream)
{
}
protected override Stream CreateBaseStream()
{
return Header.PackedStream;
}
internal override Stream GetCompressedStream()
{
if (!Header.HasData)
{
return Stream.Null;
}
decompressionStream = CreateDecompressionStream(GetCryptoStream(CreateBaseStream()));
if (LeaveStreamOpen)
{
return new NonDisposingStream(decompressionStream);
}
return decompressionStream;
}
internal BinaryReader FixStreamedFileLocation(ref RewindableStream rewindableStream)
{
if (Header.IsDirectory)
{
return new BinaryReader(rewindableStream);
}
if (Header.HasData)
{
if (decompressionStream == null)
{
decompressionStream = GetCompressedStream();
}
decompressionStream.SkipAll();
DeflateStream deflateStream = decompressionStream as DeflateStream;
if (deflateStream != null)
{
rewindableStream.Rewind(deflateStream.BaseStream as MemoryStream);
}
}
var reader = new BinaryReader(rewindableStream);
decompressionStream = null;
return reader;
}
}
}
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