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fix: use expansion-aware item size in LootResponseParser for Classic/TBC

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The previous per-iteration heuristic (remaining >= 22 → 22 bytes, >= 14 → 14 bytes)
incorrectly parsed Classic/TBC multi-item loots: 2+ items × 14 bytes would
trigger the 22-byte WotLK path for the first item, corrupting subsequent items.

Classic 1.12 and TBC 2.4.3 use 14 bytes/item (slot+itemId+count+displayInfo+slotType).
WotLK 3.3.5a uses 22 bytes/item (adds randomSuffix+randomPropertyId).

Add isWotlkFormat bool parameter to LootResponseParser::parse and pass
isActiveExpansion('wotlk') from handleLootResponse.
This commit is contained in:
Kelsi 2026-03-11 04:01:07 -07:00
parent dd7d74cb93
commit 750b270502
3 changed files with 22 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/game/world_packets.hpp
View file

@ -2015,7 +2015,9 @@ public:
/** SMSG_LOOT_RESPONSE parser */
class LootResponseParser {
public:
static bool parse(network::Packet& packet, LootResponseData& data);
// isWotlkFormat: true for WotLK 3.3.5a (22 bytes/item with randomSuffix+randomProp),
// false for Classic 1.12 and TBC 2.4.3 (14 bytes/item).
static bool parse(network::Packet& packet, LootResponseData& data, bool isWotlkFormat = true);
};
// ============================================================

5
src/game/game_handler.cpp
View file

@ -16164,7 +16164,10 @@ void GameHandler::unstuckHearth() {
}
void GameHandler::handleLootResponse(network::Packet& packet) {
if (!LootResponseParser::parse(packet, currentLoot)) return;
// Classic 1.12 and TBC 2.4.3 use 14 bytes/item (no randomSuffix/randomProp fields);
// WotLK 3.3.5a uses 22 bytes/item.
const bool wotlkLoot = isActiveExpansion("wotlk");
if (!LootResponseParser::parse(packet, currentLoot, wotlkLoot)) return;
lootWindowOpen = true;
localLootState_[currentLoot.lootGuid] = LocalLootState{currentLoot, false};

41
src/game/world_packets.cpp
View file

@ -3320,7 +3320,7 @@ network::Packet LootReleasePacket::build(uint64_t lootGuid) {
return packet;
}
bool LootResponseParser::parse(network::Packet& packet, LootResponseData& data) {
bool LootResponseParser::parse(network::Packet& packet, LootResponseData& data, bool isWotlkFormat) {
data = LootResponseData{};
if (packet.getSize() - packet.getReadPos() < 14) {
LOG_WARNING("LootResponseParser: packet too short");
@ -3332,45 +3332,34 @@ bool LootResponseParser::parse(network::Packet& packet, LootResponseData& data)
data.gold = packet.readUInt32();
uint8_t itemCount = packet.readUInt8();
// Item wire size:
// WotLK 3.3.5a: slot(1)+itemId(4)+count(4)+displayInfo(4)+randSuffix(4)+randProp(4)+slotType(1) = 22
// Classic/TBC: slot(1)+itemId(4)+count(4)+displayInfo(4)+slotType(1) = 14
const size_t kItemSize = isWotlkFormat ? 22u : 14u;
auto parseLootItemList = [&](uint8_t listCount, bool markQuestItems) -> bool {
for (uint8_t i = 0; i < listCount; ++i) {
size_t remaining = packet.getSize() - packet.getReadPos();
if (remaining < 10) {
if (remaining < kItemSize) {
return false;
}
// Prefer the richest format when possible:
// 22-byte (WotLK/full): slot+id+count+display+randSuffix+randProp+slotType
// 14-byte (compact): slot+id+count+display+slotType
// 10-byte (minimal): slot+id+count+slotType
uint8_t bytesPerItem = 10;
if (remaining >= 22) {
bytesPerItem = 22;
} else if (remaining >= 14) {
bytesPerItem = 14;
}
LootItem item;
item.slotIndex = packet.readUInt8();
item.itemId = packet.readUInt32();
item.count = packet.readUInt32();
item.slotIndex = packet.readUInt8();
item.itemId = packet.readUInt32();
item.count = packet.readUInt32();
item.displayInfoId = packet.readUInt32();
if (bytesPerItem >= 14) {
item.displayInfoId = packet.readUInt32();
} else {
item.displayInfoId = 0;
}
if (bytesPerItem == 22) {
item.randomSuffix = packet.readUInt32();
if (isWotlkFormat) {
item.randomSuffix = packet.readUInt32();
item.randomPropertyId = packet.readUInt32();
} else {
item.randomSuffix = 0;
item.randomSuffix = 0;
item.randomPropertyId = 0;
}
item.lootSlotType = packet.readUInt8();
item.isQuestItem = markQuestItems;
item.isQuestItem = markQuestItems;
data.items.push_back(item);
}
return true;