/// <summary>
/// Extract an entry from the archive. This method assumes that the
/// tarIn stream has been properly set with a call to GetNextEntry().
/// </summary>
/// <param name="destDir">
/// The destination directory into which to extract.
/// </param>
/// <param name="entry">
/// The TarEntry returned by tarIn.GetNextEntry().
/// </param>
void ExtractEntry(string destDir, TarEntry entry)
{
OnProgressMessageEvent(entry, null);
string name = entry.Name;
if (Path.IsPathRooted(name))
{
// NOTE:
// for UNC names... \\machine\share\zoom\beet.txt gives \zoom\beet.txt
name = name.Substring(Path.GetPathRoot(name).Length);
}
name = name.Replace('/', Path.DirectorySeparatorChar);
var regx = new Regex(@"[*|:<>?""]");
//var matchs = regx.Matches(name);
//foreach (Match match in matchs)
//{
// var cha = match.Value.ToCharArray()[0];
// name = name.Replace(match.Value, $"[{(int)cha:X4}]");
//}
name = regx.Replace(name, "_");
string destFile = Path.Combine(destDir, name);
if (entry.IsDirectory)
{
EnsureDirectoryExists(destFile);
}
else
{
string parentDirectory = Path.GetDirectoryName(destFile);
EnsureDirectoryExists(parentDirectory);
bool process = true;
var fileInfo = new FileInfo(destFile);
if (fileInfo.Exists)
{
if (keepOldFiles)
{
OnProgressMessageEvent(entry, "Destination file already exists");
process = false;
}
else if ((fileInfo.Attributes & FileAttributes.ReadOnly) != 0)
{
OnProgressMessageEvent(entry, "Destination file already exists, and is read-only");
process = false;
}
}
if (process)
{
try
{
bool asciiTrans = false;
Stream outputStream = File.Create(destFile);
if (this.asciiTranslate)
{
asciiTrans = !IsBinary(destFile);
}
StreamWriter outw = null;
if (asciiTrans)
{
outw = new StreamWriter(outputStream);
}
byte[] rdbuf = new byte[32 * 1024];
while (true)
{
int numRead = tarIn.Read(rdbuf, 0, rdbuf.Length);
if (numRead <= 0)
{
break;
}
if (asciiTrans)
{
for (int off = 0, b = 0; b < numRead; ++b)
{
if (rdbuf[b] == 10)
{
string s = Encoding.ASCII.GetString(rdbuf, off, (b - off));
outw.WriteLine(s);
off = b + 1;
}
}
}
else
{
outputStream.Write(rdbuf, 0, numRead);
}
}
if (asciiTrans)
{
outw.Dispose();
}
else
{
outputStream.Dispose();
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}
}
/// <summary>
/// Create a <see cref="TarEntry"/> based on named
/// </summary>
/// <param name="name">The name to use for the entry</param>
/// <returns>A new <see cref="TarEntry"/></returns>
public TarEntry CreateEntry(string name)
{
return(TarEntry.CreateTarEntry(name));
}
/// <summary>
/// Create a tar entry with details obtained from <paramref name="fileName">file</paramref>
/// </summary>
/// <param name="fileName">The name of the file to retrieve details from.</param>
/// <returns>A new <see cref="TarEntry"/></returns>
public TarEntry CreateEntryFromFile(string fileName)
{
return(TarEntry.CreateEntryFromFile(fileName));
}
/// <summary>
/// Get the next entry in this tar archive. This will skip
/// over any remaining data in the current entry, if there
/// is one, and place the input stream at the header of the
/// next entry, and read the header and instantiate a new
/// TarEntry from the header bytes and return that entry.
/// If there are no more entries in the archive, null will
/// be returned to indicate that the end of the archive has
/// been reached.
/// </summary>
/// <returns>
/// The next TarEntry in the archive, or null.
/// </returns>
public TarEntry GetNextEntry()
{
if (hasHitEOF)
{
return(null);
}
if (currentEntry != null)
{
SkipToNextEntry();
}
byte[] headerBuf = tarBuffer.ReadBlock();
if (headerBuf == null)
{
hasHitEOF = true;
}
else
{
hasHitEOF |= TarBuffer.IsEndOfArchiveBlock(headerBuf);
}
if (hasHitEOF)
{
currentEntry = null;
}
else
{
try
{
var header = new TarHeader();
header.ParseBuffer(headerBuf);
if (!header.IsChecksumValid)
{
throw TarException.InvalidHeader("Header checksum is invalid");
}
this.entryOffset = 0;
this.entrySize = header.Size;
StringBuilder longName = null;
if (header.TypeFlag == TarHeader.LF_GNU_LONGNAME)
{
byte[] nameBuffer = new byte[TarBuffer.BlockSize];
long numToRead = this.entrySize;
longName = new StringBuilder();
while (numToRead > 0)
{
int numRead = this.Read(nameBuffer, 0, (numToRead > nameBuffer.Length ? nameBuffer.Length : (int)numToRead));
if (numRead == -1)
{
throw TarException.UnKnown("Failed to read long name entry");
}
longName.Append(TarHeader.ParseName(nameBuffer, 0, numRead).ToString());
numToRead -= numRead;
}
SkipToNextEntry();
headerBuf = this.tarBuffer.ReadBlock();
}
else if (header.TypeFlag == TarHeader.LF_GHDR)
{ // POSIX global extended header
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = this.tarBuffer.ReadBlock();
}
else if (header.TypeFlag == TarHeader.LF_XHDR)
{ // POSIX extended header
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = this.tarBuffer.ReadBlock();
}
else if (header.TypeFlag == TarHeader.LF_GNU_VOLHDR)
{
// TODO: could show volume name when verbose
SkipToNextEntry();
headerBuf = this.tarBuffer.ReadBlock();
}
else if (header.TypeFlag != TarHeader.LF_NORMAL &&
header.TypeFlag != TarHeader.LF_OLDNORM &&
header.TypeFlag != TarHeader.LF_LINK &&
header.TypeFlag != TarHeader.LF_SYMLINK &&
header.TypeFlag != TarHeader.LF_DIR)
{
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = tarBuffer.ReadBlock();
}
if (entryFactory == null)
{
currentEntry = new TarEntry(headerBuf);
if (longName != null)
{
currentEntry.Name = longName.ToString();
}
}
else
{
currentEntry = entryFactory.CreateEntry(headerBuf);
}
// Magic was checked here for 'ustar' but there are multiple valid possibilities
// so this is not done anymore.
entryOffset = 0;
// TODO: Review How do we resolve this discrepancy?!
entrySize = this.currentEntry.Size;
}
catch (TarException ex)
{
entrySize = 0;
entryOffset = 0;
currentEntry = null;
string errorText = string.Format("Bad header in record {0} block {1} {2}",
tarBuffer.CurrentRecord, tarBuffer.CurrentBlock, ex.Message);
throw TarException.UnKnown(errorText);
}
}
return(currentEntry);
}
