/// <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>
/// 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>
/// Write an entry to the archive. This method will call the putNextEntry
/// and then write the contents of the entry, and finally call closeEntry()
/// for entries that are files. For directories, it will call putNextEntry(),
/// and then, if the recurse flag is true, process each entry that is a
/// child of the directory.
/// </summary>
/// <param name="sourceEntry">
/// The TarEntry representing the entry to write to the archive.
/// </param>
/// <param name="recurse">
/// If true, process the children of directory entries.
/// </param>
void WriteEntryCore(TarEntry sourceEntry, bool recurse)
{
string tempFileName = null;
string entryFilename = sourceEntry.File;
var entry = (TarEntry)sourceEntry.Clone();
if (applyUserInfoOverrides)
{
entry.GroupId = groupId;
entry.GroupName = groupName;
entry.UserId = userId;
entry.UserName = userName;
}
OnProgressMessageEvent(entry, null);
if (asciiTranslate && !entry.IsDirectory)
{
if (!IsBinary(entryFilename))
{
tempFileName = Path.GetTempFileName();
using (StreamReader inStream = File.OpenText(entryFilename)) {
using (Stream outStream = File.Create(tempFileName)) {
while (true)
{
string line = inStream.ReadLine();
if (line == null)
{
break;
}
byte[] data = Encoding.ASCII.GetBytes(line);
outStream.Write(data, 0, data.Length);
outStream.WriteByte((byte)'\n');
}
outStream.Flush();
}
}
entry.Size = new FileInfo(tempFileName).Length;
entryFilename = tempFileName;
}
}
string newName = null;
if (rootPath != null)
{
if (entry.Name.StartsWith(rootPath, StringComparison.OrdinalIgnoreCase))
{
newName = entry.Name.Substring(rootPath.Length + 1);
}
}
if (pathPrefix != null)
{
newName = (newName == null) ? pathPrefix + "/" + entry.Name : pathPrefix + "/" + newName;
}
if (newName != null)
{
entry.Name = newName;
}
tarOut.PutNextEntry(entry);
if (entry.IsDirectory)
{
if (recurse)
{
TarEntry[] list = entry.GetDirectoryEntries();
for (int i = 0; i < list.Length; ++i)
{
WriteEntryCore(list[i], recurse);
}
}
}
else
{
using (Stream inputStream = File.OpenRead(entryFilename)) {
byte[] localBuffer = new byte[32 * 1024];
while (true)
{
int numRead = inputStream.Read(localBuffer, 0, localBuffer.Length);
if (numRead <= 0)
{
break;
}
tarOut.Write(localBuffer, 0, numRead);
}
}
if (!string.IsNullOrEmpty(tempFileName))
{
File.Delete(tempFileName);
}
tarOut.CloseEntry();
}
}
/// <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 if (TarBuffer.IsEndOfArchiveBlock(headerBuf))
{
hasHitEOF = true;
// Read the second zero-filled block
tarBuffer.ReadBlock();
}
else
{
hasHitEOF = false;
}
if (hasHitEOF)
{
currentEntry = null;
}
else
{
try {
var header = new TarHeader();
header.ParseBuffer(headerBuf);
if (!header.IsChecksumValid)
{
throw new TarException("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 new InvalidHeaderException("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
{
byte[] nameBuffer = new byte[TarBuffer.BlockSize];
long numToRead = this.entrySize;
var xhr = new TarExtendedHeaderReader();
while (numToRead > 0)
{
int numRead = this.Read(nameBuffer, 0, (numToRead > nameBuffer.Length ? nameBuffer.Length : (int)numToRead));
if (numRead == -1)
{
throw new InvalidHeaderException("Failed to read long name entry");
}
xhr.Read(nameBuffer, numRead);
numToRead -= numRead;
}
if (xhr.Headers.TryGetValue("path", out string name))
{
longName = new StringBuilder(name);
}
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 (InvalidHeaderException 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 new InvalidHeaderException(errorText);
}
}
return(currentEntry);
}
/// <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);
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)
{
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();
}
}
}
}
