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