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using System.IO;
using SharpCompress.Common.Zip.Headers;
namespace SharpCompress.Common.Zip
{
internal class SeekableZipFilePart : ZipFilePart
{
private bool isLocalHeaderLoaded;
private readonly SeekableZipHeaderFactory headerFactory;
internal SeekableZipFilePart(SeekableZipHeaderFactory headerFactory, DirectoryEntryHeader header, Stream stream)
: base(header, stream)
{
this.headerFactory = headerFactory;
}
internal override Stream GetCompressedStream()
{
if (!isLocalHeaderLoaded)
{
LoadLocalHeader();
isLocalHeaderLoaded = true;
}
return base.GetCompressedStream();
}
internal string Comment
{
get { return (Header as DirectoryEntryHeader).Comment; }
}
private void LoadLocalHeader()
{
bool hasData = Header.HasData;
Header = headerFactory.GetLocalHeader(BaseStream, Header as DirectoryEntryHeader);
Header.HasData = hasData;
}
protected override Stream CreateBaseStream()
{
BaseStream.Position = Header.DataStartPosition.Value;
return BaseStream;
}
}
}
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