public static HeaderBlock CreateHeaderBlock()
{
var hb = new HeaderBlock
{
name = new byte[100],
mode = new byte[8],
uid = new byte[8],
gid = new byte[8],
size = new byte[12],
modifiedTime = new byte[12],
checkSum = new byte[8],
linkName = new byte[100],
magic = new byte[6],
version = new byte[2],
userName = new byte[32],
groupName = new byte[32],
devMajor = new byte[8],
devMinor = new byte[8],
prefix = new byte[155],
pad = new byte[12],
};
Array.Copy(Encoding.ASCII.GetBytes("ustar "), 0, hb.magic, 0, 6);
hb.version[0] = hb.version[1] = (byte)TarEntryType.File;
return(hb);
}
/// <summary>Adds a file to the tar Archive</summary>
/// <param name="fullName">The file to add to the archive</param><param name="directory"></param>
public void AddFile(string fullName, string directory = null)
{
if (string.IsNullOrEmpty(directory))
{
directory = Path.GetDirectoryName(fullName);
}
// is it a symlink (ReparsePoint)?
FileAttributes a = File.GetAttributes(fullName);
if ((a & FileAttributes.ReparsePoint) != 0)
{
this.AddSymlink(fullName);
return;
}
if (this.TarOptions.StatusWriter != null)
{
this.TarOptions.StatusWriter.WriteLine("{0}", fullName);
}
HeaderBlock hb = HeaderBlock.CreateHeaderBlock();
string file = Path.Combine(directory, Path.GetFileName(fullName));
if (file == fullName)
{
file = Path.GetFileName(fullName);
}
hb.InsertName(file, fullName);
hb.TypeFlag = (byte)TarEntryType.File; // 0 + (byte)'0' ;
var fi = new FileInfo(fullName);
hb.SetSize((int)fi.Length);
hb.SetChksum();
byte[] block = this.Serializer.RawSerialize(hb);
this.outFS.Write(block, 0, block.Length);
using (FileStream fs = File.Open(fullName, FileMode.Open, FileAccess.Read))
{
Array.Clear(block, 0, block.Length);
while (fs.Read(block, 0, block.Length) > 0)
{
this.outFS.Write(block, 0, block.Length); // not n!!
Array.Clear(block, 0, block.Length);
}
}
}
/// <summary>Adds a symbolic link to a Tar archive</summary>
/// <param name="name">The filename of the symbolic link</param>
private void AddSymlink(string name)
{
if (this.TarOptions.StatusWriter != null)
{
this.TarOptions.StatusWriter.WriteLine("{0}", name);
}
// add the block for the symlink, right here.
HeaderBlock hb = HeaderBlock.CreateHeaderBlock();
hb.InsertName(name, null);
hb.InsertLinkName(name);
hb.TypeFlag = (byte)TarEntryType.SymbolicLink;
hb.SetSize(0);
hb.SetChksum();
byte[] block = this.Serializer.RawSerialize(hb);
this.outFS.Write(block, 0, block.Length);
}
/// <summary>Adds a directory to the tar archive</summary>
/// <param name="dirName">The path to the directory</param><param name="parent"></param>
public void AddDirectory(string dirName, string parent = null)
{
if (parent == null)
{
parent = dirName;
}
// insure trailing slash
if (!dirName.EndsWith(Path.DirectorySeparatorChar.ToString()))
{
dirName += Path.DirectorySeparatorChar;
}
if (this.TarOptions.StatusWriter != null)
{
this.TarOptions.StatusWriter.WriteLine("{0}", dirName);
}
string dir = dirName.Replace(parent, null).TrimSlash();
if (dir != string.Empty)
{
// add the block for the dir, right here.
HeaderBlock hb = HeaderBlock.CreateHeaderBlock();
hb.InsertName(dir, dirName);
hb.TypeFlag = 5 + (byte)'0';
hb.SetSize(0); // some impls use agg size of all files contained
hb.SetChksum();
byte[] block = this.Serializer.RawSerialize(hb);
this.outFS.Write(block, 0, block.Length);
}
// add the files:
string[] filenames = Directory.GetFiles(dirName);
foreach (string filename in filenames)
{
this.AddFile(filename, dir);
}
// add the subdirectories:
string[] dirnames = Directory.GetDirectories(dirName);
foreach (string d in dirnames)
{
// handle reparse points
FileAttributes a = File.GetAttributes(d);
if ((a & FileAttributes.ReparsePoint) == 0)
{
// not a symlink
this.AddDirectory(d, Path.GetDirectoryName(dirName));
}
else if (this.TarOptions.FollowSymLinks)
{
// isa symlink, and we want to follow it
this.AddDirectory(d, Path.GetDirectoryName(dirName));
}
else
{
// not following symlinks; add it
this.AddSymlink(d);
}
}
}
/// <param name="archive"></param><param name="extractDirectory"></param> <param name="wantExtract"></param>
/// <returns></returns>
private List <TarEntry> InternalListOrExtract(string archive, string extractDirectory, bool wantExtract)
{
var entryList = new List <TarEntry>();
var block = new byte[512];
int blocksToMunch = 0;
int remainingBytes = 0;
Stream output = null;
DateTime mtime = DateTime.Now;
string name = null;
TarEntry entry = null;
var deferredDirTimestamp = new Dictionary <string, DateTime>();
if (!File.Exists(archive))
{
throw new FileNotFoundException("The archive does not exist", archive);
}
using (Stream fs = this.InternalGetInputStream(archive))
{
while (fs.Read(block, 0, block.Length) > 0)
{
if (blocksToMunch > 0)
{
if (output != null)
{
int bytesToWrite = (block.Length < remainingBytes) ? block.Length : remainingBytes;
output.Write(block, 0, bytesToWrite);
remainingBytes -= bytesToWrite;
}
blocksToMunch--;
if (blocksToMunch == 0)
{
if (output != null)
{
if (output is MemoryStream)
{
entry.Name =
name = Encoding.ASCII.GetString((output as MemoryStream).ToArray()).TrimNull();
}
output.Close();
output.Dispose();
if (output is FileStream && !this.TarOptions.DoNotSetTime)
{
File.SetLastWriteTimeUtc(Path.Combine(extractDirectory, name), mtime);
}
output = null;
}
}
continue;
}
HeaderBlock hb = this.Serializer.RawDeserialize(block);
if (!hb.VerifyChksum())
{
throw new Exception("header checksum is invalid.");
}
// if this is the first entry, or if the prior entry is not a GnuLongName
if (entry == null || entry.Type != TarEntryType.GnuLongName)
{
name = hb.GetName();
}
if (string.IsNullOrEmpty(name))
{
break; // EOF
}
mtime = hb.GetMtime();
remainingBytes = hb.GetSize();
if (hb.TypeFlag == 0)
{
hb.TypeFlag = (byte)'0'; // coerce old-style GNU type to posix tar type
}
entry = new TarEntry
{
Name = name, Mtime = mtime, Size = remainingBytes, @Type = (TarEntryType)hb.TypeFlag
};
if (entry.Type != TarEntryType.GnuLongName)
{
entryList.Add(entry);
}
blocksToMunch = (remainingBytes > 0) ? ((remainingBytes - 1) / 512) + 1 : 0;
if (entry.Type == TarEntryType.GnuLongName)
{
if (name != "././@LongLink")
{
if (wantExtract)
{
throw new Exception(
string.Format(
"unexpected name for type 'L' (expected '././@LongLink', got '{0}')", name));
}
}
// for GNU long names, we extract the long name info into a memory stream
output = new MemoryStream();
continue;
}
if (!wantExtract)
{
}
else
{
switch (entry.Type)
{
case TarEntryType.Directory:
if (!Directory.Exists(Path.Combine(extractDirectory, name)))
{
Directory.CreateDirectory(Path.Combine(extractDirectory, name));
// cannot set the time on the directory now, or it will be updated
// by future file writes. Defer until after all file writes are done.
if (!this.TarOptions.DoNotSetTime)
{
deferredDirTimestamp.Add(
Path.Combine(extractDirectory, name).TrimSlash(), mtime);
}
}
else if (this.TarOptions.Overwrite)
{
if (!this.TarOptions.DoNotSetTime)
{
deferredDirTimestamp.Add(
Path.Combine(extractDirectory, name).TrimSlash(), mtime);
}
}
break;
case TarEntryType.FileOld:
case TarEntryType.File:
case TarEntryType.FileContiguous:
string p = Path.GetDirectoryName(Path.Combine(extractDirectory, name));
if (!string.IsNullOrEmpty(p))
{
if (!Directory.Exists(p))
{
Directory.CreateDirectory(p);
}
}
output = this.InternalGetExtractOutputStream(name, extractDirectory);
break;
case TarEntryType.GnuVolumeHeader:
case TarEntryType.CharSpecial:
case TarEntryType.BlockSpecial:
// do nothing on extract
break;
case TarEntryType.SymbolicLink:
break;
default:
throw new Exception(string.Format("unsupported entry type ({0})", hb.TypeFlag));
}
}
}
}
// apply the deferred timestamps on the directories
if (deferredDirTimestamp.Count > 0)
{
foreach (string key in deferredDirTimestamp.Keys)
{
Directory.SetLastWriteTimeUtc(key, deferredDirTimestamp[key]);
}
}
return(entryList);
}
