60 lines
2.9 KiB
C#
60 lines
2.9 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using SharpCompress.Common.Zip;
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using SharpCompress.Common.Zip.Headers;
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namespace SharpCompress.Writer.Zip
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{
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internal class ZipCentralDirectoryEntry
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{
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internal string FileName { get; set; }
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internal DateTime? ModificationTime { get; set; }
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internal string Comment { get; set; }
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internal uint Crc { get; set; }
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internal uint HeaderOffset { get; set; }
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internal uint Compressed { get; set; }
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internal uint Decompressed { get; set; }
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internal uint Write(Stream outputStream, ZipCompressionMethod compression)
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{
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byte[] encodedFilename = Encoding.UTF8.GetBytes(FileName);
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byte[] encodedComment = Encoding.UTF8.GetBytes(Comment);
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outputStream.Write(new byte[] {80, 75, 1, 2, 0x3F, 0, 0x0A, 0}, 0, 8);
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HeaderFlags flags = HeaderFlags.UTF8;
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if (!outputStream.CanSeek)
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{
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flags |= HeaderFlags.UsePostDataDescriptor;
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if (compression == ZipCompressionMethod.LZMA)
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{
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flags |= HeaderFlags.Bit1; // eos marker
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}
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}
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outputStream.Write(BitConverter.GetBytes((ushort) flags), 0, 2);
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outputStream.Write(BitConverter.GetBytes((ushort) compression), 0, 2); // zipping method
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outputStream.Write(BitConverter.GetBytes(ModificationTime.DateTimeToDosTime()), 0, 4);
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// zipping date and time
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outputStream.Write(BitConverter.GetBytes(Crc), 0, 4); // file CRC
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outputStream.Write(BitConverter.GetBytes(Compressed), 0, 4); // compressed file size
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outputStream.Write(BitConverter.GetBytes(Decompressed), 0, 4); // uncompressed file size
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outputStream.Write(BitConverter.GetBytes((ushort) encodedFilename.Length), 0, 2); // Filename in zip
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outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // extra length
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outputStream.Write(BitConverter.GetBytes((ushort) encodedComment.Length), 0, 2);
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outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // disk=0
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outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // file type: binary
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outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // Internal file attributes
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outputStream.Write(BitConverter.GetBytes((ushort) 0x8100), 0, 2);
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// External file attributes (normal/readable)
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outputStream.Write(BitConverter.GetBytes(HeaderOffset), 0, 4); // Offset of header
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outputStream.Write(encodedFilename, 0, encodedFilename.Length);
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outputStream.Write(encodedComment, 0, encodedComment.Length);
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return (uint) (8 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2
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+ 2 + 2 + 2 + 2 + 4 + encodedFilename.Length + encodedComment.Length);
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}
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}
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} |