unit SoftDogService;

interface

uses Classes, Windows;

const
  ConfigName = 'config.scs';

type
  TBytes = array of Byte;

  TScSoftDog = class
  private
    FV0MaxLinks: Integer;
    FV1MaxLinks: Integer;
    FV2MaxLinks: Integer;
    FCriticalSection: TRTLCriticalSection;
  public
    constructor Create;
    destructor Destroy; override;

    function ReadUserDog: Boolean;
    function ReadData(const AAddr, ABytes: Integer): string;

    property V0MaxLinks: Integer read FV0MaxLinks;
    property V1MaxLinks: Integer read FV1MaxLinks;
    property V2MaxLinks: Integer read FV2MaxLinks;
  end;

  TProperty = class(TComponent)
  private
    FPort: Integer;
  public
    constructor Create;
  published
    property Port: Integer read FPort write FPort;
  end;

  TScPersistent = class
  private
    FFileDir: string;
    FProperty: TProperty;
    function GetPort: Integer;
    procedure SetPort(const Value: Integer);
  published
    constructor Create;
    destructor Destroy; override;

    procedure WritePersistentProperty;
    procedure ReadPersistentProperty;
    
    property FileDir: string read FFileDir write FFileDir;
    property Port: Integer read GetPort write SetPort;
  end;

implementation

uses SysUtils;

var
  DogAddr: integer;
  DogBytes: integer;
  DogData: ^byte;

function WriteDog: LongInt; external;
function ReadDog: LongInt; external;
{$L rgdlw32d.obj}


{ TScPersistent }

function TScPersistent.GetPort: Integer;
begin
  Result := FProperty.Port;
end;

procedure TScPersistent.WritePersistentProperty;
var
  sName: string;
  MeStream: TMemoryStream;
begin
  MeStream := TMemoryStream.Create;
  try
    sName := FFileDir + ConfigName;
    MeStream.WriteComponent(FProperty);
    MeStream.SaveToFile(sName);
  finally
    MeStream.Free;
  end;
end;

procedure TScPersistent.SetPort(const Value: Integer);
begin
  FProperty.Port := Value;
end;

procedure TScPersistent.ReadPersistentProperty;
var
  sName: string;
  MeStream: TMemoryStream;
begin
  MeStream := TMemoryStream.Create;
  try
    sName := FFileDir + ConfigName;
    if not FileExists(sName) then Exit;
    MeStream.LoadFromFile(sName);
    MeStream.ReadComponent(FProperty);
  finally
    MeStream.Free;
  end;
end;

constructor TScPersistent.Create;
begin
  FProperty := TProperty.Create;
end;

destructor TScPersistent.Destroy;
begin
  FProperty.Free;
  inherited;
end;

{ TProperty }

constructor TProperty.Create;
begin
  inherited Create(nil);
  FPort := 5500;
end;

{ TScSoftDog }

constructor TScSoftDog.Create;
begin
  InitializeCriticalSection(FCriticalSection);
end;

destructor TScSoftDog.Destroy;
begin
  DeleteCriticalSection(FCriticalSection);
  inherited;
end;

function TScSoftDog.ReadData(const AAddr, ABytes: Integer): string;
var
  serinal: LongInt;
  arrData: TBytes;
//  arrData: array [0..99] of Byte;
begin
  EnterCriticalSection(FCriticalSection);
  try
    SetLength(Result, ABytes);
    SetLength(arrData, ABytes);

    DogAddr := AAddr;
    DogBytes := ABytes;
    if (AAddr = 0) and (ABytes = 0) then
      DogData := @serinal
    else
      DogData := @arrData[0];

    if ReadDog = 0 then
    begin
      if (AAddr = 0) and (ABytes = 0) then
        Result := IntToStr(serinal)
      else
        Move(arrData[0], Result[1], ABytes);
    end
    else Result := '';
  finally
    LeaveCriticalSection(FCriticalSection);
  end;
end;

function TScSoftDog.ReadUserDog: Boolean;
var
  arrData: array [0..2] of Byte;
begin
  EnterCriticalSection(FCriticalSection);
  try
    Result := True;

    DogAddr := $52;
    DogBytes := Length(arrData);
    DogData := @arrData;

    if ReadDog = 0 then
    begin
      FV0MaxLinks := arrData[0];
      FV1MaxLinks := arrData[1];
      FV2MaxLinks := arrData[2];
      if (FV0MaxLinks = 0) and (FV1MaxLinks = 0)
        and (FV2MaxLinks = 0) then
        Result := False;
    end
    else Result := False;
  finally
    LeaveCriticalSection(FCriticalSection);
  end;
end;

end.