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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../../stdafx.h"
#include "../../textfile_gui.h"
#include "../../newgrf_config.h"
#include "../../base_media_base.h"
#include "../../base_media_graphics.h"
#include "../../base_media_music.h"
#include "../../base_media_sounds.h"
#include "../../ai/ai.hpp"
#include "../../game/game.hpp"
#include "../../fios.h"
#include "tcp_content.h"
 
#include "table/strings.h"
 
#include "../../safeguards.h"

bool ContentInfo::IsSelected() const
{
  switch (this->state) {
    case ContentInfo::State::Selected:
    case ContentInfo::State::Autoselected:
    case ContentInfo::State::AlreadyHere:
      return true;
 
    default:
      return false;
  }
}

bool ContentInfo::IsValid() const
{
  return this->state < ContentInfo::State::Invalid && this->type >= ContentType::Begin && this->type < ContentType::End;
}

std::optional<std::string> ContentInfo::GetTextfile(TextfileType type) const
{
  if (this->state == ContentInfo::State::Invalid) return std::nullopt;
  std::optional<std::string_view> tmp;
  switch (this->type) {
    default: NOT_REACHED();
    case ContentType::Ai:
      tmp = AI::GetScannerInfo()->FindMainScript(*this, true);
      break;
    case ContentType::AiLibrary:
      tmp = AI::GetScannerLibrary()->FindMainScript(*this, true);
      break;
    case ContentType::Gs:
      tmp = Game::GetScannerInfo()->FindMainScript(*this, true);
      break;
    case ContentType::GsLibrary:
      tmp = Game::GetScannerLibrary()->FindMainScript(*this, true);
      break;
    case ContentType::NewGRF: {
      const GRFConfig *gc = FindGRFConfig(std::byteswap(this->unique_id), FindGRFConfigMode::Exact, &this->md5sum);
      if (gc != nullptr) tmp = gc->filename;
      break;
    }
    case ContentType::BaseGraphics:
      tmp = TryGetBaseSetFile(*this, true, BaseGraphics::GetAvailableSets());
      break;
    case ContentType::BaseSounds:
      tmp = TryGetBaseSetFile(*this, true, BaseSounds::GetAvailableSets());
      break;
    case ContentType::BaseMusic:
      tmp = TryGetBaseSetFile(*this, true, BaseMusic::GetAvailableSets());
      break;
    case ContentType::Scenario:
    case ContentType::Heightmap:
      tmp = FindScenario(*this, true);
      break;
  }
  if (!tmp.has_value()) return std::nullopt;
  return ::GetTextfile(type, GetContentInfoSubDir(this->type), *tmp);
}

bool NetworkContentSocketHandler::HandlePacket(Packet &p)
{
  PacketContentType type = static_cast<PacketContentType>(p.Recv_uint8());
 
  switch (type) {
    case PacketContentType::ClientInfoList: return this->ReceiveClientInfoList(p);
    case PacketContentType::ClientInfoID: return this->ReceiveClientInfoID(p);
    case PacketContentType::ClientInfoExternalID: return this->ReceiveClientInfoExternalID(p);
    case PacketContentType::ClientInfoExternalIDMD5: return this->ReceiveClientInfoExternalIDMD5(p);
    case PacketContentType::ServerInfo: return this->ReceiveServerInfo(p);
    case PacketContentType::ClientContent: return this->ReceiveClientContent(p);
    case PacketContentType::ServerContent: return this->ReceiveServerContent(p);
 
    default:
      Debug(net, 0, "[tcp/content] Received invalid packet type {}", type);
      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 interface 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::ReceiveClientInfoList(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ClientInfoList); }
bool NetworkContentSocketHandler::ReceiveClientInfoID(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ClientInfoID); }
bool NetworkContentSocketHandler::ReceiveClientInfoExternalID(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ClientInfoExternalID); }
bool NetworkContentSocketHandler::ReceiveClientInfoExternalIDMD5(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ClientInfoExternalIDMD5); }
bool NetworkContentSocketHandler::ReceiveServerInfo(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ServerInfo); }
bool NetworkContentSocketHandler::ReceiveClientContent(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ClientContent); }
bool NetworkContentSocketHandler::ReceiveServerContent(Packet &) { return this->ReceiveInvalidPacket(PacketContentType::ServerContent); }

Subdirectory GetContentInfoSubDir(ContentType type)
{
  switch (type) {
    default: return Subdirectory::None;
    case ContentType::Ai: return Subdirectory::Ai;
    case ContentType::AiLibrary: return Subdirectory::AiLibrary;
    case ContentType::Gs: return Subdirectory::Gs;
    case ContentType::GsLibrary: return Subdirectory::GsLibrary;
    case ContentType::NewGRF: return Subdirectory::NewGrf;
 
    case ContentType::BaseGraphics:
    case ContentType::BaseSounds:
    case ContentType::BaseMusic:
      return Subdirectory::Baseset;
 
    case ContentType::Scenario: return Subdirectory::Scenario;
    case ContentType::Heightmap: return Subdirectory::Heightmap;
  }
}