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Core/PacketIO: Reduce amount of stack space used by a few giant packet classes

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This commit is contained in:
Shauren
2025-08-07 23:55:53 +02:00
parent d0047ccbee
commit ecb78919ad
1 changed files with 20 additions and 4 deletions
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24
src/server/game/Server/Packets/PacketUtilities.h
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@@ -147,6 +147,21 @@ namespace WorldPackets
[[noreturn]] void OnInvalidArraySize(std::size_t requestedSize, std::size_t sizeLimit);
template <typename T, std::size_t N, bool IsLarge>
struct ArrayAllocatorTraits
{
using allocator_type = short_alloc::short_alloc<T, (N * sizeof(T) + (alignof(std::max_align_t) - 1)) & ~(alignof(std::max_align_t) - 1)>;
using resource_type = typename allocator_type::arena_type;
};
// don't store elements inline when size is large
template <typename T, std::size_t N>
struct ArrayAllocatorTraits<T, N, true>
{
using allocator_type = std::allocator<T>;
using resource_type = std::allocator<T>;
};
/**
* Utility class for automated prevention of loop counter spoofing in client packets
*/
@@ -154,8 +169,9 @@ namespace WorldPackets
class Array
{
public:
using allocator_type = short_alloc::short_alloc<T, (N * sizeof(T) + (alignof(std::max_align_t) - 1)) & ~(alignof(std::max_align_t) - 1)>;
using arena_type = typename allocator_type::arena_type;
using allocator_traits = ArrayAllocatorTraits<T, N, (sizeof(T) * N > 0x1000)>;
using allocator_type = typename allocator_traits::allocator_type;
using allocator_resource_type = typename allocator_traits::resource_type;
using storage_type = std::vector<T, allocator_type>;
@@ -170,7 +186,7 @@ namespace WorldPackets
using iterator = typename storage_type::iterator;
using const_iterator = typename storage_type::const_iterator;
Array() : _storage(_data) { }
Array() : _storage(_allocatorResource) { }
Array(Array const& other) : Array()
{
@@ -253,7 +269,7 @@ namespace WorldPackets
}
private:
arena_type _data;
allocator_resource_type _allocatorResource;
storage_type _storage;
};