/// <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 == null ) {
throw new ArgumentNullException("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(blockBuffer);
buffer.WriteBlock(blockBuffer); // Add special long filename header block
int nameCharIndex = 0;
while (nameCharIndex < entry.TarHeader.Name.Length) {
Array.Clear(blockBuffer, 0, blockBuffer.Length);
TarHeader.GetAsciiBytes(entry.TarHeader.Name, nameCharIndex, this.blockBuffer, 0, TarBuffer.BlockSize);
nameCharIndex += TarBuffer.BlockSize;
buffer.WriteBlock(blockBuffer);
}
}
entry.WriteEntryHeader(blockBuffer);
buffer.WriteBlock(blockBuffer);
currBytes = 0;
currSize = entry.IsDirectory ? 0 : entry.Size;
}
/// <summary>
/// Add the checksum integer to header buffer.
/// </summary>
/// <param name = "value"></param>
/// <param name = "buffer">The header buffer to set the checksum for</param>
/// <param name = "offset">The offset into the buffer for the checksum</param>
/// <param name = "length">The number of header bytes to update.
/// It's formatted differently from the other fields: it has 6 digits, a
/// null, then a space -- rather than digits, a space, then a null.
/// The final space is already there, from checksumming
/// </param>
/// <returns>The modified buffer offset</returns>
static int GetCheckSumOctalBytes(long value, byte[] buffer, int offset, int length)
{
TarHeader.GetOctalBytes(value, buffer, offset, length - 1);
return(offset + length);
}
/// <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;
}
if (hasHitEOF) {
currentEntry = 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.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_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>
/// Construct a TarEntry using the <paramref name="header">header</paramref> provided
/// </summary>
/// <param name="header">Header details for entry</param>
public TarEntry(TarHeader header)
{
if ( header == null )
{
throw new ArgumentNullException("header");
}
this.header = (TarHeader)header.Clone();
}
/// <summary>
/// Construct an entry from an archive's header bytes. File is set
/// to null.
/// </summary>
/// <param name = "headerBuffer">
/// The header bytes from a tar archive entry.
/// </param>
public TarEntry(byte[] headerBuffer)
{
header = new TarHeader();
header.ParseBuffer(headerBuffer);
}
/// <summary>
/// Initialise a default instance of <see cref="TarEntry"/>.
/// </summary>
private TarEntry()
{
header = new TarHeader();
}
/// <summary>
/// Fill in a TarHeader given only the entry's name.
/// </summary>
/// <param name="header">
/// The TarHeader to fill in.
/// </param>
/// <param name="name">
/// The tar entry name.
/// </param>
static public void NameTarHeader(TarHeader header, string name)
{
if ( header == null ) {
throw new ArgumentNullException("header");
}
if ( name == null ) {
throw new ArgumentNullException("name");
}
bool isDir = name.EndsWith("/");
header.Name = name;
header.Mode = isDir ? 1003 : 33216;
header.UserId = 0;
header.GroupId = 0;
header.Size = 0;
header.ModTime = DateTime.UtcNow;
header.TypeFlag = isDir ? TarHeader.LF_DIR : TarHeader.LF_NORMAL;
header.LinkName = String.Empty;
header.UserName = String.Empty;
header.GroupName = String.Empty;
header.DevMajor = 0;
header.DevMinor = 0;
}
/// <summary>
/// Fill in a TarHeader with information from a File.
/// </summary>
/// <param name="header">
/// The TarHeader to fill in.
/// </param>
/// <param name="file">
/// The file from which to get the header information.
/// </param>
public void GetFileTarHeader(TarHeader header, string file)
{
if ( header == null ) {
throw new ArgumentNullException("header");
}
if ( file == null ) {
throw new ArgumentNullException("file");
}
this.file = file;
// bugfix from torhovl from #D forum:
string name = file;
#if !NETCF_1_0 && !NETCF_2_0
// 23-Jan-2004 GnuTar allows device names in path where the name is not local to the current directory
if (name.IndexOf(Environment.CurrentDirectory) == 0) {
name = name.Substring(Environment.CurrentDirectory.Length);
}
#endif
/*
if (Path.DirectorySeparatorChar == '\\')
{
// check if the OS is Windows
// Strip off drive letters!
if (name.Length > 2)
{
char ch1 = name[0];
char ch2 = name[1];
if (ch2 == ':' && Char.IsLetter(ch1))
{
name = name.Substring(2);
}
}
}
*/
name = name.Replace(Path.DirectorySeparatorChar, '/');
// No absolute pathnames
// Windows (and Posix?) paths can start with UNC style "\\NetworkDrive\",
// so we loop on starting /'s.
while (name.StartsWith("/")) {
name = name.Substring(1);
}
header.LinkName = String.Empty;
header.Name = name;
if (Directory.Exists(file)) {
header.Mode = 1003; // Magic number for security access for a UNIX filesystem
header.TypeFlag = TarHeader.LF_DIR;
if ( (header.Name.Length == 0) || header.Name[header.Name.Length - 1] != '/') {
header.Name = header.Name + "/";
}
header.Size = 0;
} else {
header.Mode = 33216; // Magic number for security access for a UNIX filesystem
header.TypeFlag = TarHeader.LF_NORMAL;
header.Size = new FileInfo(file.Replace('/', Path.DirectorySeparatorChar)).Length;
}
header.ModTime = System.IO.File.GetLastWriteTime(file.Replace('/', Path.DirectorySeparatorChar)).ToUniversalTime();
header.DevMajor = 0;
header.DevMinor = 0;
}