示例#1
0
        /// <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;
        }
示例#2
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);
        }
示例#3
0
 /// <summary>
 /// Initialization code common to all pseudo constructors.
 /// </summary>
 void Initialize()
 {
     this.file   = null;
     this.header = new TarHeader();
 }
示例#4
0
 /// <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);
        }
示例#6
0
 /// <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);
 }