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constructor TCustomZLibStream.Create(Strm: TStream);					

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{ Abstract ancestor class }
  TCustomZlibStream = class(TStream)
  private
    FStrm: TStream;
    FStrmPos: Integer;
    FOnProgress: TNotifyEvent;
    FZRec: TZStreamRec;
    FBuffer: array [0..4095] of Char;
  protected
    procedure Progress(Sender: TObject); dynamic;
    property OnProgress: TNotifyEvent read FOnProgress write FOnProgress;
    constructor Create(Strm: TStream);
  end;					

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procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
  const OutBuf: Pointer; BufSize: Integer);
var
  strm: TZStreamRec;
begin
  FillChar(strm, sizeof(strm), 0);
  @strm.zalloc := @zlibAllocMem;
  @strm.zfree := @zlibFreeMem;
  strm.next_in := InBuf;
  strm.avail_in := InBytes;
  strm.next_out := OutBuf;
  strm.avail_out := BufSize;
  DCheck(inflateInit_(strm, zlib_version, sizeof(strm)));
  try
    {if} DCheck(inflate(strm, Z_FINISH)) {<> Z_STREAM_END then
      raise EZlibError.CreateRes(@sTargetBufferTooSmall);}
  finally
    DCheck(inflateEnd(strm));
  end;
end;

{ TCustomZlibStream }

constructor TCustomZLibStream.Create(Strm: TStream);
begin
  inherited Create;
  FStrm := Strm;
  FStrmPos := Strm.Position;
  FZRec.zalloc := zlibAllocMem;
  FZRec.zfree := zlibFreeMem;
end;