/// <summary>
/// Method to create a new zip storage in a stream
/// </summary>
/// <param name="_stream"></param>
/// <param name="_comment"></param>
/// <returns>A valid ZipStorer object</returns>
public static VDataProcesser Create(XorStream _stream, string _comment)
{
VDataProcesser zip = new VDataProcesser();
zip.Comment = _comment;
zip.ZipFileStream = _stream;
zip.Access = FileAccess.Write;
return(zip);
}
/// <summary>
/// Method to open an existing storage file
/// </summary>
/// <param name="_filename">Full path of Zip file to open</param>
/// <param name="_access">File access mode as used in FileStream constructor</param>
/// <returns>A valid ZipStorer object</returns>
public static VDataProcesser Open(string _filename, FileAccess _access)
{
var stream = new XorStream(_filename, FileMode.Open, _access == FileAccess.Read ? FileAccess.Read : FileAccess.ReadWrite);
VDataProcesser zip = Open(stream, _access);
zip.FileName = _filename;
return(zip);
}
/// <summary>
/// Method to create a new storage file
/// </summary>
/// <param name="_filename">Full path of Zip file to create</param>
/// <param name="_comment">General comment for Zip file</param>
/// <returns>A valid ZipStorer object</returns>
public static VDataProcesser Create(string _filename, string _comment)
{
var stream = new XorStream(_filename, FileMode.Create, FileAccess.ReadWrite);
VDataProcesser zip = Create(stream, _comment);
zip.Comment = _comment;
zip.FileName = _filename;
return(zip);
}
/// <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 ZipStorer object</returns>
public static VDataProcesser Open(XorStream _stream, FileAccess _access)
{
if (!_stream.CanSeek && _access != FileAccess.Read)
{
throw new InvalidOperationException("Stream cannot seek");
}
VDataProcesser zip = new VDataProcesser();
//zip.FileName = _filename;
zip.ZipFileStream = _stream;
zip.Access = _access;
if (zip.ReadFileInfo())
{
return(zip);
}
throw new System.IO.InvalidDataException();
}
/// <summary>
/// Updates central directory (if pertinent) and close the Zip storage
/// </summary>
/// <remarks>This is a required step, unless automatic dispose is used</remarks>
public void Close()
{
if (this.Access != FileAccess.Read)
{
uint centralOffset = (uint)this.ZipFileStream.Position;
uint centralSize = 0;
if (this.CentralDirImage != null)
{
this.ZipFileStream.Write(CentralDirImage, 0, CentralDirImage.Length);
}
for (int i = 0; i < Files.Count; i++)
{
long pos = this.ZipFileStream.Position;
this.WriteCentralDirRecord(Files[i]);
centralSize += (uint)(this.ZipFileStream.Position - pos);
}
if (this.CentralDirImage != null)
{
this.WriteEndRecord(centralSize + (uint)CentralDirImage.Length, centralOffset);
}
else
{
this.WriteEndRecord(centralSize, centralOffset);
}
}
if (this.ZipFileStream != null)
{
this.ZipFileStream.Flush();
this.ZipFileStream.Dispose();
this.ZipFileStream = null;
}
}
