[Delphi] ZLib (Compress, Decompress)

https://docwiki.embarcadero.com/CodeExamples/Sydney/en/ZLibCompressDecompress_(Delphi) 

ZLibCompressDecompress (Delphi) - RAD Studio Code Examples

uses System.ZLib;

procedure TForm1.btnCompressClick(Sender: TObject);
var
  LInput, LOutput: TFileStream;
  LZip: TZCompressionStream;

begin
  { Create the Input, Output, and Compressed streams. }
  LInput := TFileStream.Create(Edit1.Text, fmOpenRead);
  LOutput := TFileStream.Create(Edit2.Text + '.zip', fmCreate);
  LZip := TZCompressionStream.Create(clDefault, LOutput);

  { Compress data. }
  LZip.CopyFrom(LInput, LInput.Size);

  { Free the streams. }
  LZip.Free;
  LInput.Free;
  LOutput.Free;
end;

procedure TForm1.btnDecompressClick(Sender: TObject);
var
  LInput, LOutput: TFileStream;
  LUnZip: TZDecompressionStream;

begin
  { Create the Input, Output, and Decompressed streams. }
  LInput := TFileStream.Create(Edit1.Text, fmOpenRead);
  LOutput := TFileStream.Create(ChangeFileExt(Edit1.Text, 'txt'), fmCreate);
  LUnZip := TZDecompressionStream.Create(LInput);

  { Decompress data. }
  LOutput.CopyFrom(LUnZip, 0);

  { Free the streams. }
  LUnZip.Free;
  LInput.Free;
  LOutput.Free;
end;