/// <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;
}