Eric Robinson
1 year ago
committed by
GitHub
15 changed files with 224 additions and 151 deletions
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/**
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* @file items/validation.cpp |
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* |
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* Implementation of functions for validation of player and item data. |
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*/ |
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#include "items/validation.h" |
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#include <cstdint> |
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#include "items.h" |
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#include "monstdat.h" |
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#include "player.h" |
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namespace devilution { |
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namespace { |
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bool hasMultipleFlags(uint16_t flags) |
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{ |
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return (flags & (flags - 1)) > 0; |
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} |
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} // namespace
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bool IsCreationFlagComboValid(uint16_t iCreateInfo) |
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{ |
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iCreateInfo = iCreateInfo & ~CF_LEVEL; |
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const bool isTownItem = (iCreateInfo & CF_TOWN) != 0; |
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const bool isPregenItem = (iCreateInfo & CF_PREGEN) != 0; |
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const bool isUsefulItem = (iCreateInfo & CF_USEFUL) == CF_USEFUL; |
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if (isPregenItem) { |
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// Pregen flags are discarded when an item is picked up, therefore impossible to have in the inventory
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return false; |
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} |
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if (isUsefulItem && (iCreateInfo & ~CF_USEFUL) != 0) |
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return false; |
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if (isTownItem && hasMultipleFlags(iCreateInfo)) { |
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// Items from town can only have 1 towner flag
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return false; |
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} |
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return true; |
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} |
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bool IsTownItemValid(uint16_t iCreateInfo, const Player &player) |
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{ |
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const uint8_t level = iCreateInfo & CF_LEVEL; |
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const bool isBoyItem = (iCreateInfo & CF_BOY) != 0; |
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const uint8_t maxTownItemLevel = 30; |
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// Wirt items in multiplayer are equal to the level of the player, therefore they cannot exceed the max character level
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if (isBoyItem && level <= player.getMaxCharacterLevel()) |
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return true; |
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return level <= maxTownItemLevel; |
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} |
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bool IsShopPriceValid(const Item &item) |
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{ |
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const int boyPriceLimit = gbIsHellfire ? MaxBoyValueHf : MaxBoyValue; |
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if ((item._iCreateInfo & CF_BOY) != 0 && item._iIvalue > boyPriceLimit) |
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return false; |
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const uint16_t smithOrWitch = CF_SMITH | CF_SMITHPREMIUM | CF_WITCH; |
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const int smithAndWitchPriceLimit = gbIsHellfire ? MaxVendorValueHf : MaxVendorValue; |
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if ((item._iCreateInfo & smithOrWitch) != 0 && item._iIvalue > smithAndWitchPriceLimit) |
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return false; |
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return true; |
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} |
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bool IsUniqueMonsterItemValid(uint16_t iCreateInfo, uint32_t dwBuff) |
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{ |
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const uint8_t level = iCreateInfo & CF_LEVEL; |
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// Check all unique monster levels to see if they match the item level
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for (const UniqueMonsterData &uniqueMonsterData : UniqueMonstersData) { |
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const auto &uniqueMonsterLevel = static_cast<uint8_t>(MonstersData[uniqueMonsterData.mtype].level); |
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if (IsAnyOf(uniqueMonsterData.mtype, MT_DEFILER, MT_NAKRUL, MT_HORKDMN)) { |
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// These monsters don't use their mlvl for item generation
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continue; |
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} |
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if (level == uniqueMonsterLevel) { |
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// If the ilvl matches the mlvl, we confirm the item is legitimate
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return true; |
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} |
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} |
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return false; |
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} |
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bool IsDungeonItemValid(uint16_t iCreateInfo, uint32_t dwBuff) |
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{ |
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const uint8_t level = iCreateInfo & CF_LEVEL; |
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const bool isHellfireItem = (dwBuff & CF_HELLFIRE) != 0; |
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// Check all monster levels to see if they match the item level
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for (int16_t i = 0; i < static_cast<int16_t>(NUM_MTYPES); i++) { |
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const auto &monsterData = MonstersData[i]; |
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auto monsterLevel = static_cast<uint8_t>(monsterData.level); |
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if (i != MT_DIABLO && monsterData.availability == MonsterAvailability::Never) { |
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// Skip monsters that are unable to appear in the game
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continue; |
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} |
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if (i == MT_DIABLO && !isHellfireItem) { |
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// Adjust The Dark Lord's mlvl if the item isn't a Hellfire item to match the Diablo mlvl
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monsterLevel -= 15; |
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} |
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if (level == monsterLevel) { |
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// If the ilvl matches the mlvl, we confirm the item is legitimate
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return true; |
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} |
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} |
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if (isHellfireItem) { |
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uint8_t hellfireMaxDungeonLevel = 24; |
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// Hellfire adjusts the currlevel minus 7 in dungeon levels 20-24 for generating items
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hellfireMaxDungeonLevel -= 7; |
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return level <= (hellfireMaxDungeonLevel * 2); |
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} |
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uint8_t diabloMaxDungeonLevel = 16; |
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// Diablo doesn't have containers that drop items in dungeon level 16, therefore we decrement by 1
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diabloMaxDungeonLevel--; |
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return level <= (diabloMaxDungeonLevel * 2); |
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} |
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bool IsItemValid(const Player &player, const Item &item) |
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{ |
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if (item.IDidx != IDI_GOLD && !IsCreationFlagComboValid(item._iCreateInfo)) |
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return false; |
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if ((item._iCreateInfo & CF_TOWN) != 0) { |
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if (!IsTownItemValid(item._iCreateInfo, player) || !IsShopPriceValid(item)) |
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return false; |
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} else if ((item._iCreateInfo & CF_USEFUL) == CF_UPER15) { |
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if (!IsUniqueMonsterItemValid(item._iCreateInfo, item.dwBuff)) |
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return false; |
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} |
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if (!IsDungeonItemValid(item._iCreateInfo, item.dwBuff)) |
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return false; |
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return true; |
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} |
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} // namespace devilution
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@ -0,0 +1,23 @@
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/**
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* @file items/validation.h |
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* |
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* Interface of functions for validation of player and item data. |
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*/ |
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#pragma once |
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#include <cstdint> |
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// Forward declared structs to avoid circular dependencies
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struct Item; |
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struct Player; |
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namespace devilution { |
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bool IsCreationFlagComboValid(uint16_t iCreateInfo); |
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bool IsTownItemValid(uint16_t iCreateInfo, const Player &player); |
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bool IsShopPriceValid(const Item &item); |
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bool IsUniqueMonsterItemValid(uint16_t iCreateInfo, uint32_t dwBuff); |
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bool IsDungeonItemValid(uint16_t iCreateInfo, uint32_t dwBuff); |
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bool IsItemValid(const Player &player, const Item &item); |
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} // namespace devilution
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