unit UnitForm;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, SynLZ, SynCommons;

type
  TTest = class(TForm)
    Compress: TButton;
    Uncompress: TButton;
    chkSynLZ: TCheckBox;
    mmo1: TMemo;
    procedure CompressClick(Sender: TObject);
    procedure UncompressClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Test: TTest;

implementation

{$R *.dfm}

{$ifdef WIN64}
uses Snappy;
{$endif}

const
  COUNT = 100000;
  FILENAME = 'partials'; //test' partials'; //'citylots'; //'THESAUR';
  FILEEXT = 'json'; //log' json'; // 'txt';

procedure TTest.CompressClick(Sender: TObject); // I did a test with 1GB vhd file, works 100%
var
{$ifdef WIN64}
  env: psnappy_env;
{$endif}
  StreamIN, StreamOUT: TMemoryStream;
  outlen: int64;
  timer: TPrecisionTimer;
  s: string;
  i: integer;
  synlz: boolean;
begin
  synlz := chkSynLZ.Checked;
  if synlz then
    s := 'SynLZ'
  else
    s := 'Snappy';
  StreamIN := TMemoryStream.Create;
  StreamOUT := TMemoryStream.Create;
  StreamIN.LoadFromFile('z:\' + FILENAME + '.' + FILEEXT);
  StreamOUT.Size := StreamIN.Size * 2;
  try
    outlen := 0;
    timer.Start;
    for i := 1 to COUNT do
      if synlz then
        outlen := SynLZCompress1(StreamIn.Memory, StreamIN.Size, streamOut.Memory)
{$ifdef WIN64}
      else begin
        New(env);
        snappy_init_env(env);
        snappy_compress(env, StreamIN.Memory, StreamIN.Size, StreamOUT.Memory, @outlen);
        snappy_free_env(env);
        Dispose(env);
      end;
{$endif};
    mmo1.Lines.Add(format('%s compress in %s, size=%d, %s/s',
      [s, timer.Stop, outlen * COUNT, KB(timer.PerSec(outlen * COUNT))]));
    StreamOUT.Size := outlen;
  finally
    StreamIN.Free;
    StreamOUT.SaveToFile('z:\' + FILENAME + '.' + s);
    StreamOUT.Free;
  end;
end;

procedure TTest.UncompressClick(Sender: TObject);
var
{$ifdef WIN64}
  env: psnappy_env;
{$endif}
  StreamIN, StreamOUT: TMemoryStream;
  outlen: int64;
  timer: TPrecisionTimer;
  s: string;
  i: integer;
  synlz: boolean;
begin
  synlz := chkSynLZ.Checked;
  if synlz then
    s := 'SynLZ'
  else
    s := 'Snappy';
  StreamIN := TMemoryStream.Create;
  StreamOUT := TMemoryStream.Create;
  StreamIN.LoadFromFile('z:\' + FILENAME + '.' + s);
  if chkSynLZ.Checked then
    outlen := SynLZdecompressdestlen(StreamIN.Memory)
{$ifdef WIN64}
  else
    snappy_uncompressed_length(StreamIN.Memory, StreamIN.Size, @outlen)
{$endif};
  StreamOUT.Size := outlen;
  try
    timer.Start;
    for i := 1 to COUNT do
      if synlz then
        outlen := SynLZDecompress1(StreamIn.Memory, StreamIN.Size, streamOut.Memory)
{$ifdef WIN64}
      else begin
        New(env);
        snappy_init_env(env);
        snappy_uncompress(StreamIN.Memory, StreamIN.Size, StreamOUT.Memory);
        snappy_free_env(env);
        Dispose(env);
      end;
{$endif};
    mmo1.Lines.Add(format('%s uncompress in %s, size=%d, %s/s',
      [s, timer.Stop, outlen * COUNT, KB(timer.PerSec(outlen * COUNT))]));
  finally
    StreamIN.Free;
    StreamOUT.SaveToFile('z:\' + FILENAME + '-' + s + '.' + FILEEXT);
    StreamOUT.Free;
  end;
end;

end.