/// <summary> /// Method to open an existing storage from stream /// </summary> /// <param name="_stream">Already opened stream with zip contents</param> /// <param name="_access">File access mode for stream operations</param> /// <returns>A valid Zippy object</returns> public static Zippy Open(Stream _stream, FileAccess _access) { if (!_stream.CanSeek && _access != FileAccess.Read) throw new InvalidOperationException("Stream cannot seek"); Zippy zip = new Zippy(); //zip.FileName = _filename; zip.ZipFileStream = _stream; zip.Access = _access; if (zip.ReadFileInfo()) return zip; throw new System.IO.InvalidDataException(); }
/// <summary> /// Removes one of many files in storage. It creates a new Zip file. /// </summary> /// <param name="_zip">Reference to the current Zip object</param> /// <param name="_zfes">List of Entries to remove from storage</param> /// <returns>True if success, false if not</returns> /// <remarks>This method only works for storage of type FileStream</remarks> public static bool RemoveEntries(ref Zippy _zip, List<ZipFileEntry> _zfes) { if (!(_zip.ZipFileStream is FileStream)) throw new InvalidOperationException("RemoveEntries is allowed just over streams of type FileStream"); //Get full list of entries List<ZipFileEntry> fullList = _zip.ReadCentralDir(); //In order to delete we need to create a copy of the zip file excluding the selected items string tempZipName = Path.GetTempFileName(); string tempEntryName = Path.GetTempFileName(); try { Zippy tempZip = Zippy.Create(tempZipName, string.Empty); foreach (ZipFileEntry zfe in fullList) { if (!_zfes.Contains(zfe)) { if (_zip.ExtractFile(zfe, tempEntryName)) { tempZip.AddFile(zfe.Method, tempEntryName, zfe.FilenameInZip, zfe.Comment); } } } _zip.Close(); tempZip.Close(); File.Delete(_zip.FileName); File.Move(tempZipName, _zip.FileName); _zip = Zippy.Open(_zip.FileName, _zip.Access); } catch { return false; } finally { if (File.Exists(tempZipName)) File.Delete(tempZipName); if (File.Exists(tempEntryName)) File.Delete(tempEntryName); } return true; }
/// <summary> /// Method to create a new zip storage in a stream /// </summary> /// <param name="_stream"></param> /// <param name="_comment"></param> /// <returns>A valid Zippy object</returns> public static Zippy Create(Stream _stream, string _comment) { Zippy zip = new Zippy(); zip.Comment = _comment; zip.ZipFileStream = _stream; zip.Access = FileAccess.Write; return zip; }