webservices传base64字串

function CompressStrToBase64(sStr: string): string;
var
  M1: TMemoryStream;
  M0, M2: TStringStream;
begin
  Result := '';
  if sStr = '' then
    Exit;
  M0 := TStringStream.Create(sStr);
  M1 := TMemoryStream.Create;
  M2 := TStringStream.Create(' ');
  try
    M0.Position := 0;
    M1.Position := 0;
    ZCompressStream(M0, M1);
    M1.Position := 0;
    M2.Position := 0;
    EncodeStream(M1, M2);
    Result := M2.DataString;
  finally
    FreeAndNil(M0);
    FreeAndNil(M1);
    FreeAndNil(M2);
  end;
end;

function DeCompressBase64ToStr(sStr: string): string;
var
  M0, M1: TStringStream;
  M2: TMemoryStream;
begin
  Result := '';
  if sStr = '' then
    Exit;
  M0 := TStringStream.Create('');
  M1 := TStringStream.Create(sStr);
  M2 := TMemoryStream.Create;
  try
    M1.Position := 0;
    M2.Position := 0;
    DeCodeStream(M1, M2);
    M0.Position := 0;
    M2.Position := 0;
    ZDecompressStream(M2, M0);
    Result := M0.DataString;
  finally
    FreeAndNil(M0);
    FreeAndNil(M2);
    FreeAndNil(M1);
  end;
end;