tcp_content.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../../stdafx.h"
#include "../../textfile_gui.h"
#include "../../newgrf_config.h"
#include "../../base_media_base.h"
#include "../../ai/ai.hpp"
#include "../../game/game.hpp"
#include "../../fios.h"
#include "tcp_content.h"
 
#include "../../safeguards.h"
 
bool ContentInfo::IsSelected() const
{
  switch (this->state) {
    case ContentInfo::SELECTED:
    case ContentInfo::AUTOSELECTED:
    case ContentInfo::ALREADY_HERE:
      return true;
 
    default:
      return false;
  }
}
 
bool ContentInfo::IsValid() const
{
  return this->state < ContentInfo::INVALID && this->type >= CONTENT_TYPE_BEGIN && this->type < CONTENT_TYPE_END;
}
 
std::optional<std::string> ContentInfo::GetTextfile(TextfileType type) const
{
  if (this->state == INVALID) return std::nullopt;
  const char *tmp;
  switch (this->type) {
    default: NOT_REACHED();
    case CONTENT_TYPE_AI:
      tmp = AI::GetScannerInfo()->FindMainScript(this, true);
      break;
    case CONTENT_TYPE_AI_LIBRARY:
      tmp = AI::GetScannerLibrary()->FindMainScript(this, true);
      break;
    case CONTENT_TYPE_GAME:
      tmp = Game::GetScannerInfo()->FindMainScript(this, true);
      break;
    case CONTENT_TYPE_GAME_LIBRARY:
      tmp = Game::GetScannerLibrary()->FindMainScript(this, true);
      break;
    case CONTENT_TYPE_NEWGRF: {
      const GRFConfig *gc = FindGRFConfig(BSWAP32(this->unique_id), FGCM_EXACT, &this->md5sum);
      tmp = gc != nullptr ? gc->filename.c_str() : nullptr;
      break;
    }
    case CONTENT_TYPE_BASE_GRAPHICS:
      tmp = TryGetBaseSetFile(this, true, BaseGraphics::GetAvailableSets());
      break;
    case CONTENT_TYPE_BASE_SOUNDS:
      tmp = TryGetBaseSetFile(this, true, BaseSounds::GetAvailableSets());
      break;
    case CONTENT_TYPE_BASE_MUSIC:
      tmp = TryGetBaseSetFile(this, true, BaseMusic::GetAvailableSets());
      break;
    case CONTENT_TYPE_SCENARIO:
    case CONTENT_TYPE_HEIGHTMAP:
      tmp = FindScenario(this, true);
      break;
  }
  if (tmp == nullptr) return std::nullopt;
  return ::GetTextfile(type, GetContentInfoSubDir(this->type), tmp);
}
 
bool NetworkContentSocketHandler::HandlePacket(Packet &p)
{
  PacketContentType type = (PacketContentType)p.Recv_uint8();
 
  switch (this->HasClientQuit() ? PACKET_CONTENT_END : type) {
    case PACKET_CONTENT_CLIENT_INFO_LIST:      return this->Receive_CLIENT_INFO_LIST(p);
    case PACKET_CONTENT_CLIENT_INFO_ID:        return this->Receive_CLIENT_INFO_ID(p);
    case PACKET_CONTENT_CLIENT_INFO_EXTID:     return this->Receive_CLIENT_INFO_EXTID(p);
    case PACKET_CONTENT_CLIENT_INFO_EXTID_MD5: return this->Receive_CLIENT_INFO_EXTID_MD5(p);
    case PACKET_CONTENT_SERVER_INFO:           return this->Receive_SERVER_INFO(p);
    case PACKET_CONTENT_CLIENT_CONTENT:        return this->Receive_CLIENT_CONTENT(p);
    case PACKET_CONTENT_SERVER_CONTENT:        return this->Receive_SERVER_CONTENT(p);
 
    default:
      if (this->HasClientQuit()) {
        Debug(net, 0, "[tcp/content] Received invalid packet type {}", type);
      } else {
        Debug(net, 0, "[tcp/content] Received illegal packet");
      }
      return false;
  }
}
 
bool NetworkContentSocketHandler::ReceivePackets()
{
  /*
   * We read only a few of the packets. This as receiving packets can be expensive
   * due to the re-resolving of the parent/child relations and checking the toggle
   * state of all bits. We cannot do this all in one go, as we want to show the
   * user what we already received. Otherwise, it can take very long before any
   * progress is shown to the end user that something has been received.
   * It is also the case that we request extra content from the content server in
   * case there is an unknown (in the content list) piece of content. These will
   * come in after the main lists have been requested. As a result, we won't be
   * getting everything reliably in one batch. Thus, we need to make subsequent
   * updates in that case as well.
   *
   * As a result, we simple handle an arbitrary number of packets in one cycle,
   * and let the rest be handled in subsequent cycles. These are ran, almost,
   * immediately after this cycle so in speed it does not matter much, except
   * that the user inferface will appear better responding.
   *
   * What arbitrary number to choose is the ultimate question though.
   */
  std::unique_ptr<Packet> p;
  static const int MAX_PACKETS_TO_RECEIVE = 42;
  int i = MAX_PACKETS_TO_RECEIVE;
  while (--i != 0 && (p = this->ReceivePacket()) != nullptr) {
    bool cont = this->HandlePacket(*p);
    if (!cont) return true;
  }
 
  return i != MAX_PACKETS_TO_RECEIVE - 1;
}
 
 
bool NetworkContentSocketHandler::ReceiveInvalidPacket(PacketContentType type)
{
  Debug(net, 0, "[tcp/content] Received illegal packet type {}", type);
  return false;
}
 
bool NetworkContentSocketHandler::Receive_CLIENT_INFO_LIST(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_LIST); }
bool NetworkContentSocketHandler::Receive_CLIENT_INFO_ID(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_ID); }
bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID); }
bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID_MD5(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID_MD5); }
bool NetworkContentSocketHandler::Receive_SERVER_INFO(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_INFO); }
bool NetworkContentSocketHandler::Receive_CLIENT_CONTENT(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_CONTENT); }
bool NetworkContentSocketHandler::Receive_SERVER_CONTENT(Packet &) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_CONTENT); }
 
Subdirectory GetContentInfoSubDir(ContentType type)
{
  switch (type) {
    default: return NO_DIRECTORY;
    case CONTENT_TYPE_AI:           return AI_DIR;
    case CONTENT_TYPE_AI_LIBRARY:   return AI_LIBRARY_DIR;
    case CONTENT_TYPE_GAME:         return GAME_DIR;
    case CONTENT_TYPE_GAME_LIBRARY: return GAME_LIBRARY_DIR;
    case CONTENT_TYPE_NEWGRF:       return NEWGRF_DIR;
 
    case CONTENT_TYPE_BASE_GRAPHICS:
    case CONTENT_TYPE_BASE_SOUNDS:
    case CONTENT_TYPE_BASE_MUSIC:
      return BASESET_DIR;
 
    case CONTENT_TYPE_SCENARIO:     return SCENARIO_DIR;
    case CONTENT_TYPE_HEIGHTMAP:    return HEIGHTMAP_DIR;
  }
}