Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Use pure C# to extract .tar and .tar.gz files
using System;
using System.IO;
using System.IO.Compression;
using System.Text;
namespace TarExample
{
public class Tar
{
/// <summary>
/// Extracts a <i>.tar.gz</i> archive to the specified directory.
/// </summary>
/// <param name="filename">The <i>.tar.gz</i> to decompress and extract.</param>
/// <param name="outputDir">Output directory to write the files.</param>
public static void ExtractTarGz(string filename, string outputDir)
{
using (var stream = File.OpenRead(filename))
ExtractTarGz(stream, outputDir);
}
/// <summary>
/// Extracts a <i>.tar.gz</i> archive stream to the specified directory.
/// </summary>
/// <param name="stream">The <i>.tar.gz</i> to decompress and extract.</param>
/// <param name="outputDir">Output directory to write the files.</param>
public static void ExtractTarGz(Stream stream, string outputDir)
{
using (var gzip = new GZipStream(stream, CompressionMode.Decompress))
{
// removed convertation to MemoryStream
ExtractTar(gzip, outputDir);
}
}
/// <summary>
/// Extractes a <c>tar</c> archive to the specified directory.
/// </summary>
/// <param name="filename">The <i>.tar</i> to extract.</param>
/// <param name="outputDir">Output directory to write the files.</param>
public static void ExtractTar(string filename, string outputDir)
{
using (var stream = File.OpenRead(filename))
ExtractTar(stream, outputDir);
}
/// <summary>
/// Extractes a <c>tar</c> archive to the specified directory.
/// </summary>
/// <param name="stream">The <i>.tar</i> to extract.</param>
/// <param name="outputDir">Output directory to write the files.</param>
public static void ExtractTar(Stream stream, string outputDir)
{
var buffer = new byte[100];
// store current position here
long pos = 0;
while (true)
{
pos += stream.Read(buffer, 0, 100);
var name = Encoding.ASCII.GetString(buffer).Trim('\0');
if (String.IsNullOrWhiteSpace(name))
break;
FakeSeekForward(stream, 24);
pos += 24;
pos += stream.Read(buffer, 0, 12);
var size = Convert.ToInt64(Encoding.UTF8.GetString(buffer, 0, 12).Trim('\0').Trim(), 8);
FakeSeekForward(stream, 376);
pos += 376;
var output = Path.Combine(outputDir, name);
if (!Directory.Exists(Path.GetDirectoryName(output)))
Directory.CreateDirectory(Path.GetDirectoryName(output));
if (!name.Equals("./", StringComparison.InvariantCulture))
{
using (var str = File.Open(output, FileMode.OpenOrCreate, FileAccess.Write))
{
var buf = new byte[size];
pos += stream.Read(buf, 0, buf.Length);
str.Write(buf, 0, buf.Length);
}
}
var offset = (int)(512 - (pos % 512));
if (offset == 512)
offset = 0;
FakeSeekForward(stream, offset);
pos += offset;
}
}
private static void FakeSeekForward(Stream stream, int offset)
{
if (stream.CanSeek)
stream.Seek(offset, SeekOrigin.Current);
else
{
int bytesRead = 0;
var buffer = new byte[offset];
while (bytesRead < offset)
{
int read = stream.Read(buffer, bytesRead, offset - bytesRead);
if (read == 0)
throw new EndOfStreamException();
bytesRead += read;
}
}
}
}
}
@Su-s

This comment has been minimized.

Copy link
Owner Author

@Su-s Su-s commented Nov 3, 2020

Modified the tgz decompression to support the tgz files of actual size more than 2GB

@dBug404

This comment has been minimized.

Copy link

@dBug404 dBug404 commented May 4, 2021

Thx for the update.
But it still did not help me, because it doesnt support single files bigger than 2GB.
the line
var buf = new byte[size];
throws an OverflowException when called with bigger values.

@unitycoder

This comment has been minimized.

Copy link

@unitycoder unitycoder commented Jun 4, 2021

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment