65 lines
2.5 KiB
C#
65 lines
2.5 KiB
C#
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using System.Collections.Generic;
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using System.IO;
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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 StreamingZipHeaderFactory : ZipHeaderFactory
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{
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internal StreamingZipHeaderFactory(string password)
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: base(StreamingMode.Streaming, password)
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{
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}
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internal IEnumerable<ZipHeader> ReadStreamHeader(Stream stream)
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{
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RewindableStream rewindableStream;
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if (stream is RewindableStream)
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{
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rewindableStream = stream as RewindableStream;
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}
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else
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{
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rewindableStream = new RewindableStream(stream);
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}
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while (true)
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{
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ZipHeader header = null;
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BinaryReader reader = new BinaryReader(rewindableStream);
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if (lastEntryHeader != null &&
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FlagUtility.HasFlag(lastEntryHeader.Flags, HeaderFlags.UsePostDataDescriptor))
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{
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reader = (lastEntryHeader.Part as StreamingZipFilePart).FixStreamedFileLocation(ref rewindableStream);
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long pos = rewindableStream.Position;
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uint crc = reader.ReadUInt32();
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if (crc == POST_DATA_DESCRIPTOR)
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{
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crc = reader.ReadUInt32();
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}
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lastEntryHeader.Crc = crc;
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lastEntryHeader.CompressedSize = reader.ReadUInt32();
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lastEntryHeader.UncompressedSize = reader.ReadUInt32();
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lastEntryHeader.DataStartPosition = pos - lastEntryHeader.CompressedSize;
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}
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lastEntryHeader = null;
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uint headerBytes = reader.ReadUInt32();
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header = ReadHeader(headerBytes, reader);
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//entry could be zero bytes so we need to know that.
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if (header.ZipHeaderType == ZipHeaderType.LocalEntry)
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{
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bool isRecording = rewindableStream.IsRecording;
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if (!isRecording)
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{
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rewindableStream.StartRecording();
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}
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uint nextHeaderBytes = reader.ReadUInt32();
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header.HasData = !IsHeader(nextHeaderBytes);
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rewindableStream.Rewind(!isRecording);
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}
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yield return header;
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}
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}
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}
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}
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