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Do not add snap item if extended item type could not be added

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The `CSnapshotBuilder::AddExtendedItemType` function can fail if the snapshot is already full. Previously, this was not handled, leading to `m_aExtendedItemTypes` being updated inconsistently with the real extended item types and the snap item being added without the extended item type. Now, the snap item is not added if its extended item type could not be added.
This commit is contained in:
Robert Müller 2024-09-19 14:09:05 +02:00
parent 67068ade90
commit 9a380ff199
2 changed files with 27 additions and 14 deletions
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39
src/engine/shared/snapshot.cpp
View file

@ -767,17 +767,22 @@ int CSnapshotBuilder::GetTypeFromIndex(int Index) const
return CSnapshot::MAX_TYPE - Index;
}
void CSnapshotBuilder::AddExtendedItemType(int Index)
bool CSnapshotBuilder::AddExtendedItemType(int Index)
{
dbg_assert(0 <= Index && Index < m_NumExtendedItemTypes, "index out of range");
int TypeId = m_aExtendedItemTypes[Index];
CUuid Uuid = g_UuidManager.GetUuid(TypeId);
int *pUuidItem = (int *)NewItem(0, GetTypeFromIndex(Index), sizeof(Uuid)); // NETOBJTYPE_EX
if(pUuidItem)
int *pUuidItem = static_cast<int *>(NewItem(0, GetTypeFromIndex(Index), sizeof(CUuid))); // NETOBJTYPE_EX
if(pUuidItem == nullptr)
{
for(size_t i = 0; i < sizeof(CUuid) / sizeof(int32_t); i++)
pUuidItem[i] = bytes_be_to_uint(&Uuid.m_aData[i * sizeof(int32_t)]);
return false;
}
const int TypeId = m_aExtendedItemTypes[Index];
const CUuid Uuid = g_UuidManager.GetUuid(TypeId);
for(size_t i = 0; i < sizeof(CUuid) / sizeof(int32_t); i++)
{
pUuidItem[i] = bytes_be_to_uint(&Uuid.m_aData[i * sizeof(int32_t)]);
}
return true;
}
int CSnapshotBuilder::GetExtendedItemTypeIndex(int TypeId)
@ -793,8 +798,12 @@ int CSnapshotBuilder::GetExtendedItemTypeIndex(int TypeId)
int Index = m_NumExtendedItemTypes;
m_NumExtendedItemTypes++;
m_aExtendedItemTypes[Index] = TypeId;
AddExtendedItemType(Index);
return Index;
if(AddExtendedItemType(Index))
{
return Index;
}
m_NumExtendedItemTypes--;
return -1;
}
void *CSnapshotBuilder::NewItem(int Type, int Id, int Size)
@ -816,11 +825,15 @@ void *CSnapshotBuilder::NewItem(int Type, int Id, int Size)
return nullptr;
}
bool Extended = false;
if(Type >= OFFSET_UUID)
const bool Extended = Type >= OFFSET_UUID;
if(Extended)
{
Extended = true;
Type = GetTypeFromIndex(GetExtendedItemTypeIndex(Type));
const int ExtendedItemTypeIndex = GetExtendedItemTypeIndex(Type);
if(ExtendedItemTypeIndex == -1)
{
return nullptr;
}
Type = GetTypeFromIndex(ExtendedItemTypeIndex);
}
CSnapshotItem *pObj = (CSnapshotItem *)(m_aData + m_DataSize);

2
src/engine/shared/snapshot.h
View file

@ -158,7 +158,7 @@ class CSnapshotBuilder
int m_aExtendedItemTypes[MAX_EXTENDED_ITEM_TYPES];
int m_NumExtendedItemTypes;
void AddExtendedItemType(int Index);
bool AddExtendedItemType(int Index);
int GetExtendedItemTypeIndex(int TypeId);
int GetTypeFromIndex(int Index) const;