/// <summary>
/// Fill in a TarHeader with information from a File.
/// </summary>
/// <param name="hdr">
/// The TarHeader to fill in.
/// </param>
/// <param name="file">
/// The file from which to get the header information.
/// </param>
public void GetFileTarHeader(TarHeader hdr, string file)
{
this.file = file;
// bugfix from torhovl from #D forum:
string name = file;
#if !COMPACT_FRAMEWORK
// 23-Jan-2004 GnuTar allows device names in path where the name is not local to the current directory
if (Environment.CurrentDirectory == Path.GetDirectoryName(name))
{
name = Path.GetFileName(name);
}
#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);
}
hdr.LinkName = String.Empty;
hdr.Name = name;
if (Directory.Exists(file))
{
hdr.Mode = 1003; // Magic number for security access for a UNIX filesystem
hdr.TypeFlag = TarHeader.LF_DIR;
if (hdr.Name.Length == 0 || hdr.Name[hdr.Name.Length - 1] != '/')
{
hdr.Name = hdr.Name + "/";
}
hdr.Size = 0;
}
else
{
hdr.Mode = 33216; // Magic number for security access for a UNIX filesystem
hdr.TypeFlag = TarHeader.LF_NORMAL;
hdr.Size = new FileInfo(file.Replace('/', Path.DirectorySeparatorChar)).Length;
}
hdr.ModTime = System.IO.File.GetLastWriteTime(file.Replace('/', Path.DirectorySeparatorChar)).ToUniversalTime();
hdr.DevMajor = 0;
hdr.DevMinor = 0;
}
/// <summary>
/// Convenience method that will modify an entry's name directly
/// in place in an entry header buffer byte array.
/// </summary>
/// <param name="outbuf">
/// The buffer containing the entry header to modify.
/// </param>
/// <param name="newName">
/// The new name to place into the header buffer.
/// </param>
public void AdjustEntryName(byte[] outbuf, string newName)
{
int offset = 0;
TarHeader.GetNameBytes(newName, outbuf, offset, TarHeader.NAMELEN);
}
/// <summary>
/// Initialization code common to all pseudo constructors.
/// </summary>
void Initialize()
{
this.file = null;
this.header = new TarHeader();
}
/// <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)
{
file = null;
this.header = header;
}
/// <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>
/// Add the checksum integer to header buffer.
/// </summary>
/// <param name = "val"></param>
/// <param name = "buf">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>
private static int GetCheckSumOctalBytes(long val, byte[] buf, int offset, int length)
{
TarHeader.GetOctalBytes(val, buf, offset, length - 1);
return(offset + length);
}