mcs/class/System.IO.Compression/SharpCompress/Writer/Zip/ZipCentralDirectoryEntry.cs

   1 using System;
   2 using System.IO;
   3 using System.Text;
   4 using SharpCompress.Common.Zip;
   5 using SharpCompress.Common.Zip.Headers;
   6
   7 namespace SharpCompress.Writer.Zip
   8 {
   9     internal class ZipCentralDirectoryEntry
  10     {
  11         internal string FileName { get; set; }
  12         internal DateTime? ModificationTime { get; set; }
  13         internal string Comment { get; set; }
  14         internal uint Crc { get; set; }
  15         internal uint HeaderOffset { get; set; }
  16         internal uint Compressed { get; set; }
  17         internal uint Decompressed { get; set; }
  18
  19
  20         internal uint Write(Stream outputStream, ZipCompressionMethod compression)
  21         {
  22             byte[] encodedFilename = Encoding.UTF8.GetBytes(FileName);
  23             byte[] encodedComment = Encoding.UTF8.GetBytes(Comment);
  24
  25             outputStream.Write(new byte[] {80, 75, 1, 2, 0x3F, 0, 0x0A, 0}, 0, 8);
  26             HeaderFlags flags = HeaderFlags.UTF8;
  27             if (!outputStream.CanSeek)
  28             {
  29                 flags |= HeaderFlags.UsePostDataDescriptor;
  30                 if (compression == ZipCompressionMethod.LZMA)
  31                 {
  32                     flags |= HeaderFlags.Bit1; // eos marker
  33                 }
  34             }
  35             outputStream.Write(BitConverter.GetBytes((ushort) flags), 0, 2);
  36             outputStream.Write(BitConverter.GetBytes((ushort) compression), 0, 2); // zipping method
  37             outputStream.Write(BitConverter.GetBytes(ModificationTime.DateTimeToDosTime()), 0, 4);
  38                 // zipping date and time
  39             outputStream.Write(BitConverter.GetBytes(Crc), 0, 4); // file CRC
  40             outputStream.Write(BitConverter.GetBytes(Compressed), 0, 4); // compressed file size
  41             outputStream.Write(BitConverter.GetBytes(Decompressed), 0, 4); // uncompressed file size
  42             outputStream.Write(BitConverter.GetBytes((ushort) encodedFilename.Length), 0, 2); // Filename in zip
  43             outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // extra length
  44             outputStream.Write(BitConverter.GetBytes((ushort) encodedComment.Length), 0, 2);
  45
  46             outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // disk=0
  47             outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // file type: binary
  48             outputStream.Write(BitConverter.GetBytes((ushort) 0), 0, 2); // Internal file attributes
  49             outputStream.Write(BitConverter.GetBytes((ushort) 0x8100), 0, 2);
  50                 // External file attributes (normal/readable)
  51             outputStream.Write(BitConverter.GetBytes(HeaderOffset), 0, 4); // Offset of header
  52
  53             outputStream.Write(encodedFilename, 0, encodedFilename.Length);
  54             outputStream.Write(encodedComment, 0, encodedComment.Length);
  55
  56             return (uint) (8 + 2 + 2 + 4 + 4 + 4 + 4 + 2 + 2 + 2
  57                            + 2 + 2 + 2 + 2 + 4 + encodedFilename.Length + encodedComment.Length);
  58         }
  59     }
  60 }