implement item translation table

src/ItemData.cc

@@ -133,6 +133,50 @@ uint32_t ItemData::primary_identifier() const {
   }
 }
 
+void ItemData::change_primary_identifier(uint32_t primary_identifier) {
+  if (((primary_identifier >> 18) & 0xFF) != this->data1[0]) {
+    throw std::runtime_error("cannot change item class via change_primary_identifier");
+  }
+  switch (this->data1[0]) {
+    case 0x00: { // Weapon
+      bool was_s_rank_weapon = this->is_s_rank_weapon();
+      // Apply data1[1], and data1[2] if it's not an ES weapon
+      this->data1[1] = (primary_identifier >> 16) & 0xFF;
+      if (!this->is_s_rank_weapon()) {
+        this->data1[2] = (primary_identifier >> 8) & 0xFF;
+      } else if (!was_s_rank_weapon) {
+        // If it wasn't an S-rank weapon before and now is, clear its special
+        this->data1[2] = 0;
+      }
+      break;
+    }
+    case 0x01: // Armor/shield/unit
+      // Apply data1[1] and data1[2]
+      this->data1[1] = (primary_identifier >> 16) & 0xFF;
+      this->data1[2] = (primary_identifier >> 8) & 0xFF;
+      break;
+    case 0x02: // Mag
+      // Apply data1[1] only
+      this->data1[1] = (primary_identifier >> 16) & 0xFF;
+      break;
+    case 0x03: // Tool
+      // Apply data1[1] and data1[2] (or data1[4] if it's a tech disk)
+      this->data1[1] = (primary_identifier >> 16) & 0xFF;
+      if (this->data1[1] == 0x02) {
+        this->data1[4] = (primary_identifier >> 8) & 0xFF;
+        this->data1[2] = primary_identifier & 0xFF;
+      } else {
+        this->data1[2] = (primary_identifier >> 8) & 0xFF;
+      }
+      break;
+    case 0x04: // Meseta
+      // Nothing to apply
+      break;
+    default:
+      throw std::runtime_error("invalid item class");
+  }
+}
+
 bool ItemData::is_wrapped(const StackLimits& limits) const {
   switch (this->data1[0]) {
     case 0:

src/ItemData.hh

@@ -154,6 +154,7 @@ struct ItemData {
   std::string hex() const;
   std::string short_hex() const;
   uint32_t primary_identifier() const;
+  void change_primary_identifier(uint32_t primary_identifier);
 
   bool is_wrapped(const StackLimits& limits) const;
   void wrap(const StackLimits& limits, uint8_t present_color);

src/ItemTranslationTable.cc

@@ -0,0 +1,110 @@
+#include "ItemTranslationTable.hh"
+
+using namespace std;
+
+static constexpr bool is_canonical(uint32_t id) {
+  return !(id & 0x80000000);
+}
+static constexpr uint32_t make_canonical(uint32_t id) {
+  return (id & 0x7FFFFFFF);
+}
+
+ItemTranslationTable::ItemTranslationTable(
+    const phosg::JSON& json,
+    const std::array<std::shared_ptr<const ItemParameterTable>, NUM_VERSIONS>& item_parameter_tables) {
+  // Parse the table and build the indexes
+  const auto& l = json.as_list();
+  for (size_t z = 0; z < l.size(); z++) {
+    const auto& e = this->entries.emplace_back(*l[z]);
+
+    bool has_any_canonical_id = false;
+    for (size_t v_s = 0; v_s < NUM_NON_PATCH_VERSIONS; v_s++) {
+      uint32_t id = e.id_for_version[v_s];
+      if (is_canonical(id)) {
+        has_any_canonical_id = true;
+        if (!this->entry_index_for_version[v_s].emplace(id, z).second) {
+          throw runtime_error(phosg::string_printf("(row %zu) duplicate canonical ID %08" PRIX32, z, id));
+        }
+      }
+    }
+    if (!has_any_canonical_id) {
+      throw runtime_error(phosg::string_printf("(row %zu) no canonical ID present in row", z));
+    }
+  }
+
+  // Validate the table by checking that:
+  // - Each non-canonical ID points to an existing canonical ID
+  // - Each canonical ID has an entry in the item parameter table
+  // - All items in the parameter tables are represented in the translation table
+  for (size_t v_s = 0; v_s < NUM_NON_PATCH_VERSIONS; v_s++) {
+    Version v = static_cast<Version>(v_s + NUM_PATCH_VERSIONS);
+    auto item_parameter_table = item_parameter_tables.at(v_s + NUM_PATCH_VERSIONS);
+    auto remaining_identifiers = item_parameter_table->compute_all_valid_primary_identifiers();
+
+    const auto& entry_index = this->entry_index_for_version[v_s];
+    for (size_t z = 0; z < this->entries.size(); z++) {
+      uint32_t e_id = this->entries[z].id_for_version[v_s];
+      if (is_canonical(e_id)) {
+        if (!entry_index.count(e_id)) {
+          throw logic_error(phosg::string_printf("(row %zu version %s) canonical ID %" PRIX32 " is missing from the index", z, phosg::name_for_enum(v), e_id));
+        }
+        try {
+          item_parameter_table->definition_for_primary_identifier(e_id);
+        } catch (const out_of_range&) {
+          throw runtime_error(phosg::string_printf("(row %zu version %s) ID %" PRIX32 " not defined in item parameter table", z, phosg::name_for_enum(v), e_id));
+        }
+        if (!remaining_identifiers.erase(e_id)) {
+          throw runtime_error(phosg::string_printf("(row %zu version %s) ID %" PRIX32 " not in item parameter table's primary identifier list", z, phosg::name_for_enum(v), e_id));
+        }
+      } else if (!entry_index.count(make_canonical(e_id))) {
+        throw runtime_error(phosg::string_printf("(row %zu version %s) ID %" PRIX32 " refers to nonexistent canonical ID", z, phosg::name_for_enum(v), e_id));
+      }
+    }
+
+    if (!remaining_identifiers.empty()) {
+      string missing_str = phosg::string_printf("(version %s) not all identifiers in the item parameter table are defined in the translation table; missing:", phosg::name_for_enum(v));
+      for (uint32_t id : remaining_identifiers) {
+        missing_str += phosg::string_printf(" %08" PRIX32, id);
+      }
+      throw runtime_error(missing_str);
+    }
+  }
+}
+
+phosg::JSON ItemTranslationTable::json() const {
+  auto ret = phosg::JSON::list();
+  for (const auto& entry : this->entries) {
+    ret.emplace_back(entry.json());
+  }
+  return ret;
+}
+
+uint32_t ItemTranslationTable::translate(uint32_t primary_identifier, Version from_version, Version to_version) const {
+  if (from_version == to_version) {
+    return primary_identifier;
+  }
+  const auto& entry_index = this->entry_index_for_version.at(static_cast<size_t>(from_version) - NUM_PATCH_VERSIONS);
+  size_t entry_num = entry_index.at(primary_identifier);
+  const auto& entry = this->entries.at(entry_num);
+  return make_canonical(entry.id_for_version.at(static_cast<size_t>(to_version) - NUM_PATCH_VERSIONS));
+}
+
+ItemTranslationTable::Entry::Entry(const phosg::JSON& json) {
+  const auto& l = json.as_list();
+  if (l.size() != NUM_NON_PATCH_VERSIONS + 1) {
+    throw runtime_error("list length is incorrect");
+  }
+  for (size_t z = 0; z < NUM_NON_PATCH_VERSIONS; z++) {
+    this->id_for_version[z] = l[z]->as_int();
+  }
+  this->name = l[NUM_NON_PATCH_VERSIONS]->as_string();
+}
+
+phosg::JSON ItemTranslationTable::Entry::json() const {
+  auto ret = phosg::JSON::list();
+  for (size_t z = 0; z < NUM_NON_PATCH_VERSIONS; z++) {
+    ret.emplace_back(this->id_for_version[z]);
+  }
+  ret.emplace_back(this->name);
+  return ret;
+}

src/ItemTranslationTable.hh

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <stdint.h>
+
+#include <array>
+#include <memory>
+#include <phosg/JSON.hh>
+#include <string>
+#include <unordered_map>
+
+#include "ItemParameterTable.hh"
+#include "Types.hh"
+#include "Version.hh"
+
+class ItemTranslationTable {
+public:
+  ItemTranslationTable(
+      const phosg::JSON& json,
+      const std::array<std::shared_ptr<const ItemParameterTable>, NUM_VERSIONS>& item_parameter_tables);
+  ~ItemTranslationTable() = default;
+
+  phosg::JSON json() const;
+
+  uint32_t translate(uint32_t primary_identifier, Version from_version, Version to_version) const;
+
+private:
+  struct Entry {
+    std::array<uint32_t, NUM_NON_PATCH_VERSIONS> id_for_version;
+    std::string name;
+
+    explicit Entry(const phosg::JSON& json);
+    phosg::JSON json() const;
+  };
+  std::vector<Entry> entries;
+  std::array<std::unordered_map<uint32_t, size_t>, NUM_NON_PATCH_VERSIONS> entry_index_for_version;
+};

src/ServerState.cc

@@ -2081,6 +2081,9 @@ void ServerState::load_item_definitions(bool from_non_event_thread) {
     new_item_parameter_tables[v_s] = make_shared<ItemParameterTable>(data, v);
   }
 
+  auto json = phosg::JSON::parse(phosg::load_file("system/item-tables/translation-table.json"));
+  auto new_item_translation_table = make_shared<ItemTranslationTable>(json, new_item_parameter_tables);
+
   // TODO: We should probably load the tables for other versions too.
   config_log.info("Loading v1/v2 mag evolution table");
   auto mag_data_v1_v2 = make_shared<string>(prs_decompress(phosg::load_file("system/item-tables/ItemMagEdit-dc-v2.prs")));
@@ -2094,10 +2097,12 @@ void ServerState::load_item_definitions(bool from_non_event_thread) {
 
   auto set = [s = this->shared_from_this(),
                  new_item_parameter_tables = std::move(new_item_parameter_tables),
+                 new_item_translation_table = std::move(new_item_translation_table),
                  new_table_v1_v2 = std::move(new_table_v1_v2),
                  new_table_v3 = std::move(new_table_v3),
                  new_table_v4 = std::move(new_table_v4)]() {
     s->item_parameter_tables = std::move(new_item_parameter_tables);
+    s->item_translation_table = std::move(new_item_translation_table);
     s->mag_evolution_table_v1_v2 = std::move(new_table_v1_v2);
     s->mag_evolution_table_v3 = std::move(new_table_v3);
     s->mag_evolution_table_v4 = std::move(new_table_v4);

src/ServerState.hh

@@ -23,6 +23,7 @@
 #include "IPV4RangeSet.hh"
 #include "ItemNameIndex.hh"
 #include "ItemParameterTable.hh"
+#include "ItemTranslationTable.hh"
 #include "LevelTable.hh"
 #include "Lobby.hh"
 #include "Menu.hh"
@@ -203,6 +204,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   std::array<std::shared_ptr<const WeaponRandomSet>, 4> weapon_random_sets;
   std::shared_ptr<const TekkerAdjustmentSet> tekker_adjustment_set;
   std::array<std::shared_ptr<const ItemParameterTable>, NUM_VERSIONS> item_parameter_tables;
+  std::shared_ptr<const ItemTranslationTable> item_translation_table;
   std::array<std::shared_ptr<const ItemData::StackLimits>, NUM_VERSIONS> item_stack_limits_tables;
   std::shared_ptr<const MagEvolutionTable> mag_evolution_table_v1_v2;
   std::shared_ptr<const MagEvolutionTable> mag_evolution_table_v3;