3DF: How to encrypt HSF file using

Version

3DF v.2X.XX
Language

C++
Description:

Below is sample code on how to encrypt your hsf file so that only your application can import hsf file.
You can use PartViewer to test sample.
#include "HStream.h"

class encyrptHSF : public BBaseOpcodeHandler 
{
       public:
              encyrptHSF() : BBaseOpcodeHandler(0xB0) {
              };
              ~encyrptHSF() {};

              TK_Status     Interpret(BStreamFileToolkit &, ID_Key, int) {
                     return TK_Normal; 
              };
              TK_Status     Execute (BStreamFileToolkit &) {
                     return TK_Normal; 
              };     

              TK_Status     Read (BStreamFileToolkit & tk) {
                     TK_Status       status = TK_Normal;

                     switch (m_stage) {
                           case 0: {
                                  unsigned char       bytes[13];

                                  if ((status = GetData (tk, bytes, 13)) != TK_Normal)
                                         return status;
                                  m_stage = -1;
                           }   break;

                           default:
                                  return tk.Error();
                     }

                     return TK_Normal; 
              };
              TK_Status     Write (BStreamFileToolkit & tk) {
                     TK_Status       status = TK_Normal;

                     switch (m_stage) {
                           case 0: {
                                  if ((status = PutOpcode (tk)) != TK_Normal)
                                         return status;
                                  m_stage++;
                           }   //nobreak;

                           case 1: {
                                  unsigned char       bytes[13] = {0, ')', '(', 0x7F, 0, ';', ' ', 'H', 'S', 'F', ' ', '1', '3'};

                                  if ((status = PutData (tk, bytes, 13)) != TK_Normal)
                                         return status;
                                  m_stage = -1;
                           }   break;

                           default:
                                  return tk.Error();
                     }

                     return TK_Normal; 
              };
};

static char const *  filename = "D:/encyrptHSFed.hsf";

//  Export
void CSolidHoopsView::OnExtraSlot1()
{
       HStreamFileToolkit   tk;
       tk.SetPrewalkHandler (new encyrptHSF);

       HC_Open_Segment_By_Key (m_pHView->GetModelKey());
              HTK_Write_Stream_File (filename, &tk);
       HC_Close_Segment ();
}

//  Import
void CSolidHoopsView::OnExtraSlot2()
{
       HStreamFileToolkit   tk;
       tk.SetOpcodeHandler (0xB0, new encyrptHSF);

       HC_Open_Segment_By_Key (m_pHView->GetModelKey());
              HTK_Read_Stream_File (filename, &tk);
       HC_Close_Segment ();

       m_pHView->FitWorld();
       m_pHView->Update();
}