Exemplo n.º 1
0
		/// <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;
		}
Exemplo n.º 2
0
		/// <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;
		}
Exemplo n.º 3
0
		/// <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);
		}
Exemplo n.º 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)
		{
			if ( header == null )
			{
				throw new ArgumentNullException("header");
			}

			this.header = (TarHeader)header.Clone();
		}
Exemplo n.º 5
0
		/// <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;
		}
Exemplo n.º 6
0
		/// <summary>
		/// Initialise a default instance of <see cref="TarEntry"/>.
		/// </summary>
		private TarEntry()
		{
			header = new TarHeader();
		}
Exemplo n.º 7
0
 /// <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);
 }
Exemplo n.º 8
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;
		}
Exemplo n.º 9
0
 /// <summary>
 /// Initialise a default instance of <see cref="TarEntry"/>.
 /// </summary>
 private TarEntry()
 {
     header = new TarHeader();
 }
Exemplo n.º 10
0
 /// <summary>
 /// Convenience method that will modify an entry's name directly
 /// in place in an entry header buffer byte array.
 /// </summary>
 /// <param name="buffer">
 /// The buffer containing the entry header to modify.
 /// </param>
 /// <param name="newName">
 /// The new name to place into the header buffer.
 /// </param>
 static public void AdjustEntryName(byte[] buffer, string newName)
 {
     TarHeader.GetNameBytes(newName, buffer, 0, TarHeader.NAMELEN);
 }
Exemplo n.º 11
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;
        }
Exemplo n.º 12
0
        /// <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);
        }
Exemplo n.º 13
0
 /// <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);
 }