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'
' This class provides the ability to archive multiple files together into a single
' distributable file called a tarball (The TAR actually stands for Tape ARchive).
' These are common UNIX files which contain uncompressed data.
'
' So what is this useful for? Well, it allows you to effectively combine multiple
' files into a single file for downloading. The TAR files are readable and extractable
' by a wide variety of tools, including the very widely distributed WinZip.
'
' This script can include two types of data in each archive, file data read from a disk,
' and also things direct from memory, like from a string. The archives support files in
' a binary structure, so you can store executable files if you need to, or just store
' text.
'
' This class was developed to assist me with a few projects and has grown with every
' implementation. Currently I use this class to tarball XML data for archival purposes
' which allows me to grab 100's of dynamically created XML files in a single download.
'
' There are a small number of properties and methods, which are outlined in the
' accompanying documentation.
'
Class Tarball
Public TarFilename   ' Resultant tarball filename

Public UserID    ' UNIX user ID
Public UserName    ' UNIX user name
Public GroupID    ' UNIX group ID
Public GroupName   ' UNIX group name

Public Permissions   ' UNIX permissions

Public BlockSize   ' Block byte size for the tarball (default=512)

Public IgnorePaths   ' Ignore any supplied paths for the tarball output
Public BasePath    ' Insert a base path with each file
Public Path

' Storage for file information
Private objFiles,TmpFileName
Private objMemoryFiles

' File list management subs, very basic stuff
Public Sub AddFile(sFilename)
  objFiles.Add sFilename,sFilename
End Sub

Public Sub RemoveFile(sFilename)
  objFiles.Remove sFilename
End Sub

Public Sub AddMemoryFile(sFilename,sContents)
  objMemoryFiles.Add sFilename,sContents
End Sub

Public Sub RemoveMemoryFile(sFilename)
  objMemoryFiles.Remove sFilename
End Sub

' Send the tarball to the browser
Public Sub WriteTar()
  Dim objStream, objInStream, lTemp, aFiles

  Set objStream = Server.CreateObject("ADODB.Stream") ' The main stream
  Set objInStream = Server.CreateObject("ADODB.Stream") ' The input stream for data
 
  objStream.Type = 2
  objStream.Charset = "x-ansi" ' Good old extended ASCII
  objStream.Open

  objInStream.Type = 2
  objInStream.Charset = "x-ansi"

  ' Go through all files stored on disk first
  aFiles = objFiles.Items
 
  For lTemp = 0 to UBound(aFiles)
   objInStream.Open
   objInStream.LoadFromFile aFiles(lTemp)
   objInStream.Position = 0
   'ExportFile aFiles(lTemp),objStream,objInStream
             TmpFileName =replace(aFiles(lTemp),Server.Mappath(Path)&"\","")
    ExportFile TmpFileName,objStream,objInStream
   objInStream.Close
  Next

  ' Now add stuff from memory
  aFiles = objMemoryFiles.Keys
 
  For lTemp = 0 to UBound(aFiles)
   objInStream.Open
   objInStream.WriteText objMemoryFiles.Item(aFiles(lTemp))
   objInStream.Position = 0
   ExportFile aFiles(lTemp),objStream,objInStream
   objInStream.Close
  Next

  objStream.WriteText String(BlockSize,Chr(0))

  ' Rewind the stream
  ' Remember to change the type back to binary, otherwise the write will truncate
  ' past the first zero byte character.
  objStream.Position = 0
  objStream.Type = 1
  ' Set all the browser stuff
  Response.AddHeader "Content-Disposition","filename=" & TarFilename
  Response.ContentType = "application/x-tar"
  Response.BinaryWrite objStream.Read
 
  ' Close it and go home
  objStream.Close
  Set objStream = Nothing
  Set objInStream = Nothing
End Sub

' Build a header for each file and send the file contents
Private Sub ExportFile(sFilename,objOutStream,objInStream)
  Dim lStart, lSum, lTemp
 
  lStart = objOutStream.Position ' Record where we are up to
 
  If IgnorePaths Then
   ' We ignore any paths prefixed to our filenames
   lTemp = InStrRev(sFilename,"\")
   if lTemp <> 0 then
    sFilename = Right(sFilename,Len(sFilename) - lTemp)
   end if
   sFilename = BasePath & sFilename
  End If
 
  ' Build the header, everything is ASCII in octal except for the data
  objOutStream.WriteText Left(sFilename & String(100,Chr(0)),100)
  objOutStream.WriteText "100" & Right("000" & Oct(Permissions),3) & " " & Chr(0) 'File mode
  objOutStream.WriteText Right(String(6," ") & CStr(UserID),6) & " " & Chr(0) 'uid
  objOutStream.WriteText Right(String(6," ") & CStr(GroupID),6) & " " & Chr(0) 'gid
  objOutStream.WriteText Right(String(11,"0") & Oct(objInStream.Size),11) & Chr(0) 'size
  objOutStream.WriteText Right(String(11,"0") & Oct(dateDiff("s","1/1/1970 10:00",now())),11) & Chr(0) 'mtime (Number of seconds since 10am on the 1st January 1970 (10am correct?)
  objOutStream.WriteText "        0" & String(100,Chr(0)) 'chksum, type flag and link name, write out all blanks so that the actual checksum will get calculated correctly
  objOutStream.WriteText "ustar  "  & Chr(0) 'magic and version
  objOutStream.WriteText Left(UserName & String(32,Chr(0)),32) 'uname
  objOutStream.WriteText Left(GroupName & String(32,Chr(0)),32) 'gname
  objOutStream.WriteText "         40 " & String(4,Chr(0)) 'devmajor, devminor
  objOutStream.WriteText String(167,Chr(0)) 'prefix and leader
  objInStream.CopyTo objOutStream ' Send the data to the stream
 
  if (objInStream.Size Mod BlockSize) > 0 then
   objOutStream.WriteText String(BlockSize - (objInStream.Size Mod BlockSize),Chr(0)) 'Padding to the nearest block byte boundary
  end if
 
  ' Calculate the checksum for the header
  lSum = 0  
  objOutStream.Position = lStart
 
  For lTemp = 1 To BlockSize
   lSum = lSum + (Asc(objOutStream.ReadText(1)) And &HFF&)
  Next
 
  ' Insert it
  objOutStream.Position = lStart + 148
  objOutStream.WriteText Right(String(7,"0") & Oct(lSum),7) & Chr(0)
 
  ' Move to the end of the stream
  objOutStream.Position = objOutStream.Size
End Sub

' Start everything off
Private Sub Class_Initialize()
  Set objFiles = Server.CreateObject("Scripting.Dictionary")
  Set objMemoryFiles = Server.CreateObject("Scripting.Dictionary")
 
  BlockSize = 512
  Permissions = 438 ' UNIX 666
 
  UserID = 0
  UserName = "root"
  GroupID = 0
  GroupName = "root"
 
  IgnorePaths = False
  BasePath = ""
 
  TarFilename = "new.tar"
End Sub

Private Sub Class_Terminate()
  Set objMemoryFiles = Nothing
  Set objFiles = Nothing
End Sub
End Class
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