Adding Zlib Compression

[William]

by: Unknown
MEdium 2/5
First download Zlib.dll

http://www.freewebs.com/miragesource/zlib.dll

then add a new module to your cleint and server call it modZlib add this code ot it:

Code:

Option Explicit

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Private Declare Function ZCompress Lib "zlib.dll" Alias "compress" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long
Private Declare Function ZUncompress Lib "zlib.dll" Alias "uncompress" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long

Public Function Compress(Data, Optional Key)
   Dim lKey As Long  'original size
   Dim sTmp As String  'string buffer
   Dim bData() As Byte  'data buffer
   Dim bRet() As Byte  'output buffer
   Dim lCSz As Long  'compressed size
  
   If TypeName(Data) = "Byte()" Then 'if given byte array data
      bData = Data  'copy to data buffer
   ElseIf TypeName(Data) = "String" Then 'if given string data
      If Len(Data) > 0 Then 'if there is data
         sTmp = Data 'copy to string buffer
         ReDim bData(Len(sTmp) - 1) 'allocate data buffer
         CopyMemory bData(0), ByVal sTmp, Len(sTmp) 'copy to data buffer
         sTmp = vbNullString 'deallocate string buffer
      End If
   End If
   If StrPtr(bData)  0 Then 'if data buffer contains data
      lKey = UBound(bData) + 1 'get data size
      lCSz = lKey + (lKey * 0.01) + 12 'estimate compressed size
      ReDim bRet(lCSz - 1) 'allocate output buffer
      Call ZCompress(bRet(0), lCSz, bData(0), lKey) 'compress data (lCSz returns actual size)
      ReDim Preserve bRet(lCSz - 1) 'resize output buffer to actual size
      Erase bData 'deallocate data buffer
      If IsMissing(Key) Then 'if Key variable not supplied
         ReDim bData(lCSz + 3) 'allocate data buffer
         CopyMemory bData(0), lKey, 4 'copy key to buffer
         CopyMemory bData(4), bRet(0), lCSz 'copy data to buffer
         Erase bRet 'deallocate output buffer
         bRet = bData 'copy to output buffer
         Erase bData 'deallocate data buffer
      Else 'Key variable is supplied
         Key = lKey 'set Key variable
      End If
      If TypeName(Data) = "Byte()" Then 'if given byte array data
         Compress = bRet 'return output buffer
      ElseIf TypeName(Data) = "String" Then 'if given string data
         sTmp = Space(UBound(bRet) + 1) 'allocate string buffer
         CopyMemory ByVal sTmp, bRet(0), UBound(bRet) + 1 'copy to string buffer
         Compress = sTmp 'return string buffer
         sTmp = vbNullString 'deallocate string buffer
      End If
      Erase bRet 'deallocate output buffer
   End If
End Function

Public Function Uncompress(Data, Optional ByVal Key)
   Dim lKey As Long  'original size
   Dim sTmp As String  'string buffer
   Dim bData() As Byte  'data buffer
   Dim bRet() As Byte  'output buffer
   Dim lCSz As Long  'compressed size
  
   If TypeName(Data) = "Byte()" Then 'if given byte array data
      bData = Data 'copy to data buffer
   ElseIf TypeName(Data) = "String" Then 'if given string data
      If Len(Data) > 0 Then 'if there is data
         sTmp = Data 'copy to string buffer
         ReDim bData(Len(sTmp) - 1) 'allocate data buffer
         CopyMemory bData(0), ByVal sTmp, Len(sTmp) 'copy to data buffer
         sTmp = vbNullString 'deallocate string buffer
      End If
   End If
   If StrPtr(bData)  0 Then 'if there is data
      If IsMissing(Key) Then 'if Key variable not supplied
         lCSz = UBound(bData) - 3 'get actual data size
         CopyMemory lKey, bData(0), 4 'copy key value to key
         ReDim bRet(lCSz - 1) 'allocate output buffer
         CopyMemory bRet(0), bData(4), lCSz 'copy data to output buffer
         Erase bData 'deallocate data buffer
         bData = bRet 'copy to data buffer
         Erase bRet 'deallocate output buffer
      Else 'Key variable is supplied
         lCSz = UBound(bData) + 1 'get data size
         lKey = Key 'get Key
      End If
      ReDim bRet(lKey - 1) 'allocate output buffer
      Call ZUncompress(bRet(0), lKey, bData(0), lCSz) 'decompress to output buffer
      Erase bData 'deallocate data buffer
      If TypeName(Data) = "Byte()" Then 'if given byte array data
         Uncompress = bRet 'return output buffer
      ElseIf TypeName(Data) = "String" Then 'if given string data
         sTmp = Space(lKey) 'allocate string buffer
         CopyMemory ByVal sTmp, bRet(0), lKey 'copy to string buffer
         Uncompress = sTmp 'return string buffer
         sTmp = vbNullString 'deallocate string buffer
      End If
      Erase bRet 'deallocate return buffer
   End If
End Function

Now i did this with Verrigans packet buffer system, so, youll need to figure it out if you dont have it in.

SERVER SIDE

Replace SendQueuedData with

Code:

Sub SendQueuedData()
Dim ECloc As Integer
Dim lR As Long

  Dim i As Integer, N As Long
  Dim TmpStr As String

  For i = 1 To MAX_PLAYERS
    If frmServer.lblOnOff.Caption = "OFFLINE" Then Exit Sub
    TmpStr = ""
    With ConQueues(i)
      If Not .Lock Then
        If frmServer.Socket(i).State  7 Then
          .Lines = ""
        End If
        If Len(.Lines) = 0 And QueueDisconnect(i) = True Then
          Call CloseSocket(i)
          QueueDisconnect(i) = False
        Else
          If Len(.Lines) > 0 Then
             If Len(.Lines) < MAX_PACKETLEN Then
               TmpStr = .Lines
             Else
               TmpStr = Left(.Lines, MAX_PACKETLEN)
             End If
             ECloc = InStr(1, .Lines, END_CHAR)
             TmpStr = Left(.Lines, ECloc)
             .Lines = Right(.Lines, Len(.Lines) - Len(TmpStr))
          End If
        End If
        If Len(TmpStr) > 0 Then
             Debug.Print "Sending: " & TmpStr
             TmpStr = Compress(TmpStr, lR)
             TmpStr = lR & SEP_CHAR & TmpStr
             Call frmServer.Socket(i).SendData(TmpStr)
        End If
      End If
    End With
    DoEvents
  Next
End Sub

This code will now add how long the packet is to the front of the packet itself.

Replace incomingData with:
[code]
Sub IncomingData(ByVal Index As Long, ByVal DataLength As Long)
Dim Buffer As String
Dim Packet As String
Dim top As String * 3
Dim Start As Integer
Dim lR As Long
Dim Sploc As Integer
If Index > 0 Then
frmServer.Socket(Index).GetData Buffer, vbString, DataLength

Sploc = InStr(1, Buffer, SEP_CHAR)
lR = Mid(Buffer, 1, Sploc - 1)
Buffer = Mid(Buffer, Sploc + 1, Len(Buffer) - Sploc)
'Debug.Print lR & vbCrLf & "Parse(1):" & vbCrLf & Buffer & vbCrLf & "Buffer:"
Buffer = Uncompress(Buffer, lR)
Debug.Print Buffer
If Buffer = "top" Then
top = STR(TotalOnlinePlayers)
Call SendDataTo(Index, top)
QueueDisconnect(Index) = True
End If

Player(Index).Buffer = Player(Index).Buffer & Buffer

Start = InStr(Player(Index).Buffer, END_CHAR)
Do While Start > 0
Packet = Mid(Player(Index).Buffer, 1, Start - 1)
Player(Index).Buffer = Mid(Player(Index).Buffer, Start + 1, Len(Player(Index).Buffer))
Player(Index).DataPackets = Player(Index).DataPackets + 1
Start = InStr(Player(Index).Buffer, END_CHAR)
If Len(Packet) > 0 Then
Call HandleData(Index, Packet)
End If
Loop

' Check if elapsed time has passed
Player(Index).DataBytes = Player(Index).DataBytes + DataLength
If GetTickCount >= Player(Index).DataTimer + 1000 Then
Player(Index).DataTimer = GetTickCount
Player(Index).DataBytes = 0
Player(Index).DataPackets = 0
Exit Sub
End If

' Check for data flooding
If Player(Index).DataBytes > 1000 And GetPlayerAccess(Index)

[Spodi]

ZLib on the packets? Just curious, did you check to see if it actually helps the packets doing that? I remember doing tons of different encryption tests on some of the biggest packets vbGORE was sending (compound packets, like the ones made when establishing a connection... we all know what those are like :wink: ) and didn't see any help from any compression until at least about 100 bytes of data, which is HUGE.

[William]

I suggest you ask the owner