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