order_sl.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 "saveload.h"
#include "compat/order_sl_compat.h"
 
#include "saveload_internal.h"
#include "../order_backup.h"
#include "../settings_type.h"
#include "../network/network.h"
 
#include "../safeguards.h"

void Order::ConvertFromOldSavegame()
{
  uint8_t old_flags = this->flags;
  this->flags = 0;
 
  /* First handle non-stop - use value from savegame if possible, else use value from config file */
  if (_settings_client.gui.sg_new_nonstop || (IsSavegameVersionBefore(SLV_22) && _savegame_type != SGT_TTO && _savegame_type != SGT_TTD && _settings_client.gui.new_nonstop)) {
    /* OFB_NON_STOP */
    this->SetNonStopType((old_flags & 8) ? OrderNonStopFlags{OrderNonStopFlag::NoIntermediate, OrderNonStopFlag::NoDestination} : OrderNonStopFlag::NoIntermediate);
  } else {
    this->SetNonStopType((old_flags & 8) ? OrderNonStopFlag::NoIntermediate : OrderNonStopFlags{});
  }
 
  switch (this->GetType()) {
    /* Only a few types need the other savegame conversions. */
    case OT_GOTO_DEPOT: case OT_GOTO_STATION: case OT_LOADING: break;
    default: return;
  }
 
  if (this->GetType() != OT_GOTO_DEPOT) {
    /* Then the load flags */
    if ((old_flags & 2) != 0) { // OFB_UNLOAD
      this->SetLoadType(OrderLoadType::NoLoad);
    } else if ((old_flags & 4) == 0) { // !OFB_FULL_LOAD
      this->SetLoadType(OrderLoadType::LoadIfPossible);
    } else {
      /* old OTTD versions stored full_load_any in config file - assume it was enabled when loading */
      this->SetLoadType(_settings_client.gui.sg_full_load_any || IsSavegameVersionBefore(SLV_22) ? OrderLoadType::FullLoadAny : OrderLoadType::FullLoad);
    }
 
    if (this->IsType(OT_GOTO_STATION)) this->SetStopLocation(OrderStopLocation::FarEnd);
 
    /* Finally fix the unload flags */
    if ((old_flags & 1) != 0) { // OFB_TRANSFER
      this->SetUnloadType(OrderUnloadType::Transfer);
    } else if ((old_flags & 2) != 0) { // OFB_UNLOAD
      this->SetUnloadType(OrderUnloadType::Unload);
    } else {
      this->SetUnloadType(OrderUnloadType::UnloadIfPossible);
    }
  } else {
    /* Then the depot action flags */
    OrderDepotActionFlags action_flags{};
    if ((old_flags & 6) == 4) action_flags.Set(OrderDepotActionFlag::Halt);
    this->SetDepotActionType(action_flags);
 
    /* Finally fix the depot type flags */
    OrderDepotTypeFlags type_flags{};
    if ((old_flags & 6) == 6) type_flags.Set(OrderDepotTypeFlag::Service);
    if ((old_flags & 2) != 0) type_flags.Set(OrderDepotTypeFlag::PartOfOrders);
    this->SetDepotOrderType(type_flags);
  }
}

static Order UnpackVersion4Order(uint16_t packed)
{
  return Order(GB(packed, 0, 4), GB(packed, 4, 4), GB(packed, 8, 8));
}

Order UnpackOldOrder(uint16_t packed)
{
  Order order = UnpackVersion4Order(packed);
 
  /*
   * Sanity check
   * TTD stores invalid orders as OT_NOTHING with non-zero flags/station
   */
  if (order.IsType(OT_NOTHING) && packed != 0) order.MakeDummy();
 
  return order;
}

static std::vector<OldOrderSaveLoadItem> _old_order_saveload_pool;

void ClearOldOrders()
{
  _old_order_saveload_pool.clear();
  _old_order_saveload_pool.shrink_to_fit();
}

OldOrderSaveLoadItem *GetOldOrder(size_t ref_index)
{
  if (ref_index == 0) return nullptr;
  assert(ref_index <= _old_order_saveload_pool.size());
  return &_old_order_saveload_pool[ref_index - 1];
}

OldOrderSaveLoadItem &AllocateOldOrder(size_t pool_index)
{
  assert(pool_index < UINT32_MAX);
  if (pool_index >= _old_order_saveload_pool.size()) _old_order_saveload_pool.resize(pool_index + 1);
  return _old_order_saveload_pool[pool_index];
}
 
SaveLoadTable GetOrderDescription()
{
  static const SaveLoad _order_desc[] = {
         SLE_VARNAME(OldOrderSaveLoadItem, order.type,  "type",  SLE_UINT8),
         SLE_VARNAME(OldOrderSaveLoadItem, order.flags, "flags", SLE_UINT8),
         SLE_VARNAME(OldOrderSaveLoadItem, order.dest,  "dest",  SLE_UINT16),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, next,        "next",  SLE_FILE_U16 | SLE_VAR_U32, SL_MIN_VERSION, SLV_69),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, next,        "next",  SLE_UINT32,                 SLV_69, SL_MAX_VERSION),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, order.refit_cargo, "refit_cargo", SLE_UINT8,   SLV_36, SL_MAX_VERSION),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, order.wait_time,   "wait_time",   SLE_UINT16,  SLV_67, SL_MAX_VERSION),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, order.travel_time, "travel_time", SLE_UINT16,  SLV_67, SL_MAX_VERSION),
     SLE_CONDVARNAME(OldOrderSaveLoadItem, order.max_speed,   "max_speed",   SLE_UINT16, SLV_172, SL_MAX_VERSION),
  };
 
  return _order_desc;
}
 
struct ORDRChunkHandler : ChunkHandler {
  ORDRChunkHandler() : ChunkHandler('ORDR', CH_READONLY) {}
 
  void Load() const override
  {
    if (IsSavegameVersionBefore(SLV_5, 2)) {
      /* Version older than 5.2 did not have a ->next pointer. Convert them
       * (in the old days, the orderlist was 5000 items big) */
      size_t len = SlGetFieldLength();
 
      if (IsSavegameVersionBefore(SLV_5)) {
        /* Pre-version 5 had another layout for orders
         * (uint16_t instead of uint32_t) */
        len /= sizeof(uint16_t);
        std::vector<uint16_t> orders(len);
 
        SlCopy(&orders[0], len, SLE_UINT16);
 
        for (size_t i = 0; i < len; ++i) {
          auto &item = AllocateOldOrder(i);
          item.order.AssignOrder(UnpackVersion4Order(orders[i]));
        }
      } else if (IsSavegameVersionBefore(SLV_5, 2)) {
        len /= sizeof(uint32_t);
        std::vector<uint32_t> orders(len);
 
        SlCopy(&orders[0], len, SLE_UINT32);
 
        for (size_t i = 0; i < len; ++i) {
          auto &item = AllocateOldOrder(i);
          item.order = Order(GB(orders[i], 0, 8), GB(orders[i], 8, 8), GB(orders[i], 16, 16));
        }
      }
 
      /* Update all the next pointer. The orders were built like this:
       * While the order is valid, the previous order will get its next pointer set */
      for (uint32_t num = 1; const OldOrderSaveLoadItem &item : _old_order_saveload_pool) {
        if (!item.order.IsType(OT_NOTHING) && num > 1) {
          OldOrderSaveLoadItem *prev = GetOldOrder(num - 1);
          if (prev != nullptr) prev->next = num;
        }
        ++num;
      }
    } else {
      const std::vector<SaveLoad> slt = SlCompatTableHeader(GetOrderDescription(), _order_sl_compat);
 
      int index;
 
      while ((index = SlIterateArray()) != -1) {
        auto &item = AllocateOldOrder(index);
        SlObject(&item, slt);
      }
    }
  }
};
 
template <typename T>
class SlOrders : public VectorSaveLoadHandler<SlOrders<T>, T, Order> {
public:
  static inline const SaveLoad description[] = {
    SLE_VAR(Order, type,        SLE_UINT8),
    SLE_VAR(Order, flags,       SLE_UINT8),
    SLE_VAR(Order, dest,        SLE_UINT16),
    SLE_VAR(Order, refit_cargo, SLE_UINT8),
    SLE_VAR(Order, wait_time,   SLE_UINT16),
    SLE_VAR(Order, travel_time, SLE_UINT16),
    SLE_VAR(Order, max_speed,   SLE_UINT16),
  };
  static inline const SaveLoadCompatTable compat_description = {};
 
  std::vector<Order> &GetVector(T *container) const override { return container->orders; }
 
  void LoadCheck(T *container) const override { this->Load(container); }
};
 
/* Instantiate SlOrders classes. */
template class SlOrders<OrderList>;
template class SlOrders<OrderBackup>;
 
SaveLoadTable GetOrderListDescription()
{
  static const SaveLoad _orderlist_desc[] = {
    SLE_CONDVARNAME(OrderList, old_order_index, "first", SLE_FILE_U16 | SLE_VAR_U32, SL_MIN_VERSION, SLV_69),
    SLE_CONDVARNAME(OrderList, old_order_index, "first", SLE_UINT32,                 SLV_69, SLV_ORDERS_OWNED_BY_ORDERLIST),
    SLEG_CONDSTRUCTLIST("orders", SlOrders<OrderList>, SLV_ORDERS_OWNED_BY_ORDERLIST, SL_MAX_VERSION),
  };
 
  return _orderlist_desc;
}
 
struct ORDLChunkHandler : ChunkHandler {
  ORDLChunkHandler() : ChunkHandler('ORDL', CH_TABLE) {}
 
  void Save() const override
  {
    const SaveLoadTable slt = GetOrderListDescription();
    SlTableHeader(slt);
 
    for (OrderList *list : OrderList::Iterate()) {
      SlSetArrayIndex(list->index);
      SlObject(list, slt);
    }
  }
 
  void Load() const override
  {
    const std::vector<SaveLoad> slt = SlCompatTableHeader(GetOrderListDescription(), _orderlist_sl_compat);
 
    int index;
 
    while ((index = SlIterateArray()) != -1) {
      OrderList *list = OrderList::CreateAtIndex(OrderListID(index));
      SlObject(list, slt);
    }
 
  }
 
  void FixPointers() const override
  {
    bool migrate_orders = IsSavegameVersionBefore(SLV_ORDERS_OWNED_BY_ORDERLIST);
 
    for (OrderList *list : OrderList::Iterate()) {
      SlObject(list, GetOrderListDescription());
 
      if (migrate_orders) {
        std::vector<Order> orders;
        for (OldOrderSaveLoadItem *old_order = GetOldOrder(list->old_order_index); old_order != nullptr; old_order = GetOldOrder(old_order->next)) {
          orders.push_back(std::move(old_order->order));
        }
        list->orders = std::move(orders);
      }
    }
  }
};
 
SaveLoadTable GetOrderBackupDescription()
{
  static const SaveLoad _order_backup_desc[] = {
         SLE_VAR(OrderBackup, user,                     SLE_UINT32),
         SLE_VAR(OrderBackup, tile,                     SLE_UINT32),
         SLE_VAR(OrderBackup, group,                    SLE_UINT16),
     SLE_CONDVAR(OrderBackup, service_interval,         SLE_FILE_U32 | SLE_VAR_U16,  SL_MIN_VERSION, SLV_192),
     SLE_CONDVAR(OrderBackup, service_interval,         SLE_UINT16,                SLV_192, SL_MAX_VERSION),
        SLE_SSTR(OrderBackup, name,                     SLE_STR),
     SLE_CONDREF(OrderBackup, clone,                    REF_VEHICLE,               SLV_192, SL_MAX_VERSION),
         SLE_VAR(OrderBackup, cur_real_order_index,     SLE_UINT8),
     SLE_CONDVAR(OrderBackup, cur_implicit_order_index, SLE_UINT8,                 SLV_176, SL_MAX_VERSION),
     SLE_CONDVAR(OrderBackup, current_order_time,       SLE_UINT32,                SLV_176, SL_MAX_VERSION),
     SLE_CONDVAR(OrderBackup, lateness_counter,         SLE_INT32,                 SLV_176, SL_MAX_VERSION),
     SLE_CONDVAR(OrderBackup, timetable_start,          SLE_FILE_I32 | SLE_VAR_U64, SLV_176, SLV_TIMETABLE_START_TICKS_FIX),
     SLE_CONDVAR(OrderBackup, timetable_start,          SLE_UINT64,                 SLV_TIMETABLE_START_TICKS_FIX, SL_MAX_VERSION),
     SLE_CONDVAR(OrderBackup, vehicle_flags,            SLE_FILE_U8 | SLE_VAR_U16, SLV_176, SLV_180),
     SLE_CONDVAR(OrderBackup, vehicle_flags,            SLE_UINT16,                SLV_180, SL_MAX_VERSION),
    SLE_CONDVARNAME(OrderBackup, old_order_index, "orders", SLE_FILE_U16 | SLE_VAR_U32, SL_MIN_VERSION, SLV_69),
    SLE_CONDVARNAME(OrderBackup, old_order_index, "orders", SLE_UINT32,                 SLV_69, SLV_ORDERS_OWNED_BY_ORDERLIST),
    SLEG_CONDSTRUCTLIST("orders", SlOrders<OrderBackup>, SLV_ORDERS_OWNED_BY_ORDERLIST, SL_MAX_VERSION),
  };
 
  return _order_backup_desc;
}
 
struct BKORChunkHandler : ChunkHandler {
  BKORChunkHandler() : ChunkHandler('BKOR', CH_TABLE) {}
 
  void Save() const override
  {
    const SaveLoadTable slt = GetOrderBackupDescription();
    SlTableHeader(slt);
 
    /* We only save this when we're a network server
     * as we want this information on our clients. For
     * normal games this information isn't needed. */
    if (!_networking || !_network_server) return;
 
    for (OrderBackup *ob : OrderBackup::Iterate()) {
      SlSetArrayIndex(ob->index);
      SlObject(ob, slt);
    }
  }
 
  void Load() const override
  {
    const std::vector<SaveLoad> slt = SlCompatTableHeader(GetOrderBackupDescription(), _order_backup_sl_compat);
 
    int index;
 
    while ((index = SlIterateArray()) != -1) {
      /* set num_orders to 0 so it's a valid OrderList */
      OrderBackup *ob = OrderBackup::CreateAtIndex(OrderBackupID(index));
      SlObject(ob, slt);
    }
  }
 
  void FixPointers() const override
  {
    bool migrate_orders = IsSavegameVersionBefore(SLV_ORDERS_OWNED_BY_ORDERLIST);
 
    for (OrderBackup *ob : OrderBackup::Iterate()) {
      SlObject(ob, GetOrderBackupDescription());
 
      if (migrate_orders) {
        std::vector<Order> orders;
        for (OldOrderSaveLoadItem *old_order = GetOldOrder(ob->old_order_index); old_order != nullptr; old_order = GetOldOrder(old_order->next)) {
          orders.push_back(std::move(old_order->order));
        }
        ob->orders = std::move(orders);
      }
    }
  }
};
 
static const BKORChunkHandler BKOR;
static const ORDRChunkHandler ORDR;
static const ORDLChunkHandler ORDL;
static const ChunkHandlerRef order_chunk_handlers[] = {
  BKOR,
  ORDR,
  ORDL,
};
 
extern const ChunkHandlerTable _order_chunk_handlers(order_chunk_handlers);