/// <summary>
/// Get entries for all files present in this entries directory.
/// If this entry doesnt represent a directory zero entries are returned.
/// </summary>
/// <returns>
/// An array of TarEntry's for this entry's children.
/// </returns>
public TarEntry[] GetDirectoryEntries()
{
if (this.file == null || !Directory.Exists(this.file)) {
return new TarEntry[0];
}
string[] list = Directory.GetFileSystemEntries(this.file);
TarEntry[] result = new TarEntry[list.Length];
for (int i = 0; i < list.Length; ++i) {
result[i] = TarEntry.CreateEntryFromFile(list[i]);
}
return result;
}
/// <summary>
/// Construct an entry for a file. File is set to file, and the
/// header is constructed from information from the file.
/// </summary>
/// <param name = "fileName">
/// The file that the entry represents.
/// </param>
public static TarEntry CreateEntryFromFile(string fileName)
{
TarEntry entry = new TarEntry();
entry.Initialize();
entry.GetFileTarHeader(entry.header, fileName);
return entry;
}
/// <summary>
/// Determine if the given entry is a descendant of this entry.
/// Descendancy is determined by the name of the descendant
/// starting with this entry's name.
/// </summary>
/// <param name = "desc">
/// Entry to be checked as a descendent of this.
/// </param>
/// <returns>
/// True if entry is a descendant of this.
/// </returns>
public bool IsDescendent(TarEntry desc)
{
return desc.Name.StartsWith(Name);
}
/// <summary>
/// Clone this tar entry.
/// </summary>
/// <returns>Returns a clone of this entry.</returns>
public object Clone()
{
TarEntry entry = new TarEntry();
entry.file = this.file;
entry.header = (TarHeader)this.header.Clone();
entry.Name = this.Name;
return entry;
}
/// <summary>
/// Construct an entry with only a <paramref name="name"></paramref>.
/// This allows the programmer to construct the entry's header "by hand".
/// </summary>
public static TarEntry CreateTarEntry(string name)
{
TarEntry entry = new TarEntry();
entry.Initialize();
entry.NameTarHeader(entry.header, name);
return entry;
}
/// <summary>
/// Put an entry on the output stream. This writes the entry's
/// header and positions the output stream for writing
/// the contents of the entry. Once this method is called, the
/// stream is ready for calls to write() to write the entry's
/// contents. Once the contents are written, closeEntry()
/// <B>MUST</B> be called to ensure that all buffered data
/// is completely written to the output stream.
/// </summary>
/// <param name="entry">
/// The TarEntry to be written to the archive.
/// </param>
public void PutNextEntry(TarEntry entry)
{
if (entry.TarHeader.Name.Length >= TarHeader.NAMELEN) {
TarHeader longHeader = new TarHeader();
longHeader.TypeFlag = TarHeader.LF_GNU_LONGNAME;
longHeader.Name = longHeader.Name + "././@LongLink";
longHeader.UserId = 0;
longHeader.GroupId = 0;
longHeader.GroupName = "";
longHeader.UserName = "";
longHeader.LinkName = "";
longHeader.Size = entry.TarHeader.Name.Length;
longHeader.WriteHeader(this.blockBuf);
this.buffer.WriteBlock(this.blockBuf); // Add special long filename header block
int nameCharIndex = 0;
while (nameCharIndex < entry.TarHeader.Name.Length) {
Array.Clear(blockBuf, 0, blockBuf.Length);
TarHeader.GetAsciiBytes(entry.TarHeader.Name, nameCharIndex, this.blockBuf, 0, TarBuffer.BlockSize);
nameCharIndex += TarBuffer.BlockSize;
this.buffer.WriteBlock(this.blockBuf);
}
}
entry.WriteEntryHeader(this.blockBuf);
this.buffer.WriteBlock(this.blockBuf);
this.currBytes = 0;
this.currSize = entry.IsDirectory ? 0 : entry.Size;
}
/// <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 (this.hasHitEOF) {
return null;
}
if (this.currEntry != null) {
SkipToNextEntry();
}
byte[] headerBuf = this.buffer.ReadBlock();
if (headerBuf == null) {
this.hasHitEOF = true;
} else if (this.buffer.IsEOFBlock(headerBuf)) {
this.hasHitEOF = true;
}
if (this.hasHitEOF) {
this.currEntry = null;
} else {
try {
TarHeader 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.buffer.ReadBlock();
} else if (header.TypeFlag == TarHeader.LF_GHDR) { // POSIX global extended header
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = this.buffer.ReadBlock();
} else if (header.TypeFlag == TarHeader.LF_XHDR) { // POSIX extended header
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = this.buffer.ReadBlock();
} else if (header.TypeFlag == TarHeader.LF_GNU_VOLHDR) {
// TODO: could show volume name when verbose
SkipToNextEntry();
headerBuf = this.buffer.ReadBlock();
} else if (header.TypeFlag != TarHeader.LF_NORMAL &&
header.TypeFlag != TarHeader.LF_OLDNORM &&
header.TypeFlag != TarHeader.LF_DIR) {
// Ignore things we dont understand completely for now
SkipToNextEntry();
headerBuf = this.buffer.ReadBlock();
}
if (this.eFactory == null) {
this.currEntry = new TarEntry(headerBuf);
if (longName != null) {
currEntry.Name = longName.ToString();
}
} else {
this.currEntry = this.eFactory.CreateEntry(headerBuf);
}
// Magic was checked here for 'ustar' but there are multiple valid possibilities
// so this is not done anymore.
this.entryOffset = 0;
// TODO: Review How do we resolve this discrepancy?!
this.entrySize = this.currEntry.Size;
} catch (InvalidHeaderException ex) {
this.entrySize = 0;
this.entryOffset = 0;
this.currEntry = null;
throw new InvalidHeaderException("bad header in record " + this.buffer.GetCurrentBlockNum() + " block " + this.buffer.GetCurrentBlockNum() + ", " + ex.Message);
}
}
return this.currEntry;
}
/// <summary>
/// Raises the ProgressMessage event
/// </summary>
/// <param name="entry">TarEntry for this event</param>
/// <param name="message">message for this event. Null is no message</param>
protected virtual void OnProgressMessageEvent(TarEntry entry, string message)
{
if (ProgressMessageEvent != null) {
ProgressMessageEvent(this, entry, message);
}
}
/// <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 InternalWriteEntry(TarEntry sourceEntry, bool recurse)
{
bool asciiTrans = false;
string tempFileName = null;
string entryFilename = sourceEntry.File;
TarEntry entry = (TarEntry)sourceEntry.Clone();
if ( applyUserInfoOverrides ) {
entry.GroupId = groupId;
entry.GroupName = groupName;
entry.UserId = userId;
entry.UserName = userName;
}
OnProgressMessageEvent(entry, null);
if (this.asciiTranslate && !entry.IsDirectory) {
asciiTrans = !IsBinary(entryFilename);
if (asciiTrans) {
tempFileName = Path.GetTempFileName();
StreamReader inStream = File.OpenText(entryFilename);
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');
}
inStream.Close();
outStream.Flush();
outStream.Close();
entry.Size = new FileInfo(tempFileName).Length;
entryFilename = tempFileName;
}
}
string newName = null;
if (this.rootPath != null) {
if (entry.Name.StartsWith(this.rootPath)) {
newName = entry.Name.Substring(this.rootPath.Length + 1 );
}
}
if (this.pathPrefix != null) {
newName = (newName == null) ? this.pathPrefix + "/" + entry.Name : this.pathPrefix + "/" + newName;
}
if (newName != null) {
entry.Name = newName;
}
this.tarOut.PutNextEntry(entry);
if (entry.IsDirectory) {
if (recurse) {
TarEntry[] list = entry.GetDirectoryEntries();
for (int i = 0; i < list.Length; ++i) {
InternalWriteEntry(list[i], recurse);
}
}
} else {
Stream inputStream = File.OpenRead(entryFilename);
int numWritten = 0;
byte[] eBuf = new byte[32 * 1024];
while (true) {
int numRead = inputStream.Read(eBuf, 0, eBuf.Length);
if (numRead <=0) {
break;
}
this.tarOut.Write(eBuf, 0, numRead);
numWritten += numRead;
}
inputStream.Close();
if (tempFileName != null && tempFileName.Length > 0) {
File.Delete(tempFileName);
}
this.tarOut.CloseEntry();
}
}
/// <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>
public void WriteEntry(TarEntry sourceEntry, bool recurse)
{
try
{
if ( recurse ) {
TarHeader.SetValueDefaults(sourceEntry.UserId, sourceEntry.UserName,
sourceEntry.GroupId, sourceEntry.GroupName);
}
InternalWriteEntry(sourceEntry, recurse);
}
finally
{
if ( recurse ) {
TarHeader.RestoreSetValues();
}
}
}
/// <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) == true) {
// 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;
FileInfo fileInfo = new FileInfo(destFile);
if (fileInfo.Exists) {
if (this.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 = this.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.Close();
} else {
outputStream.Close();
}
}
}
}
/// <summary>
/// Determine if the given entry is a descendant of this entry.
/// Descendancy is determined by the name of the descendant
/// starting with this entry's name.
/// </summary>
/// <param name = "desc">
/// Entry to be checked as a descendent of this.
/// </param>
/// <returns>
/// True if entry is a descendant of this.
/// </returns>
public bool IsDescendent(TarEntry desc)
{
return(desc.Name.StartsWith(Name));
}
