流的解压及压缩(代码精简高效)

用一个函数即实现流的压缩和解压,使用方法:
zip(源流,目标流,true/false)true为压缩,false为解压
函数如下:
function ZIP(mInputStream: TStream; mOutputStream: TStream;Compress:BOOL): BOOL;
var
  I: Integer;
  p:pchar;
  TCS:TCompressionStream;
  TDS:TDecompressionStream;
begin
result:=false;
  if not (Assigned(mInputStream) and Assigned(mOutputStream)) then Exit;
try
  if Compress then TCS:=TCompressionStream.Create(clMax,mOutputStream) else TDS:=TDecompressionStream.Create(mOutputStream);//其中的clMax表示压缩级别,可以更改,值是下列参数之一:clNone, clFastest, clDefault, clMax
  getMem(p,mInputStream.size);
  mInputStream.ReadBuffer(p^,mInputStream.Size );
  if Compress then TCS.WriteBuffer(p^,mInputStream.Size ) else TDS.WriteBuffer(p^,mInputStream.Size );  //关键代码:写入流
finally
  if Compress then TCS.Free else TDS.Free;
  FreeMem(p);
end;
result:=true;
end;
一定先uses Zlib这个单元,它提供了DELPHI下的压缩和解压功能