Various fixed

* Fixed potential invalid pointer dereferencing, fixes #1117
* Fixed ender pearls not being loaded properly

src/Entities/ProjectileEntity.cpp

@@ -21,6 +21,7 @@
 #include "FireChargeEntity.h"
 #include "FireworkEntity.h"
 #include "GhastFireballEntity.h"
+#include "Player.h"
 
 
 
@@ -215,7 +216,7 @@ protected:
 cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, double a_Width, double a_Height) :
 	super(etProjectile, a_X, a_Y, a_Z, a_Width, a_Height),
 	m_ProjectileKind(a_Kind),
-	m_Creator(a_Creator),
+	m_CreatorData(a_Creator->GetUniqueID(), a_Creator->IsPlayer() ? ((cPlayer *)a_Creator)->GetName() : ""),
 	m_IsInGround(false)
 {
 }
@@ -227,7 +228,7 @@ cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a
 cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, const Vector3d & a_Pos, const Vector3d & a_Speed, double a_Width, double a_Height) :
 	super(etProjectile, a_Pos.x, a_Pos.y, a_Pos.z, a_Width, a_Height),
 	m_ProjectileKind(a_Kind),
-	m_Creator(a_Creator),
+	m_CreatorData(a_Creator->GetUniqueID(), a_Creator->IsPlayer() ? ((cPlayer *)a_Creator)->GetName() : ""),
 	m_IsInGround(false)
 {
 	SetSpeed(a_Speed);
@@ -295,6 +296,74 @@ void cProjectileEntity::OnHitSolidBlock(const Vector3d & a_HitPos, eBlockFace a_
 
 
 
+cEntity * cProjectileEntity::GetCreator()
+{
+	if (m_CreatorData.m_Name.empty())
+	{
+		class cProjectileCreatorCallback : public cEntityCallback
+		{
+		public:
+			cProjectileCreatorCallback(void) :
+				m_Entity(NULL)
+			{
+			}
+
+			virtual bool Item(cEntity * a_Entity) override
+			{
+				m_Entity = a_Entity;
+				return true;
+			}
+
+			cEntity * GetEntity(void)
+			{
+				return m_Entity;
+			}
+
+		private:
+
+			cEntity * m_Entity;
+		};
+
+		cProjectileCreatorCallback PCC;
+		GetWorld()->DoWithEntityByID(m_CreatorData.m_UniqueID, PCC);
+		return PCC.GetEntity();
+	}
+	else
+	{
+		class cProjectileCreatorCallbackForPlayers : public cPlayerListCallback
+		{
+		public:
+			cProjectileCreatorCallbackForPlayers(void) :
+				m_Entity(NULL)
+			{
+			}
+
+			virtual bool Item(cPlayer * a_Entity) override
+			{
+				m_Entity = a_Entity;
+				return true;
+			}
+
+			cPlayer * GetEntity(void)
+			{
+				return m_Entity;
+			}
+
+		private:
+
+			cPlayer * m_Entity;
+		};
+
+		cProjectileCreatorCallbackForPlayers PCCFP;
+		GetWorld()->FindAndDoWithPlayer(m_CreatorData.m_Name, PCCFP);
+		return PCCFP.GetEntity();
+	}
+}
+
+
+
+
+
 AString cProjectileEntity::GetMCAClassName(void) const
 {
 	switch (m_ProjectileKind)
@@ -304,7 +373,7 @@ AString cProjectileEntity::GetMCAClassName(void) const
 		case pkEgg:           return "Egg";
 		case pkGhastFireball: return "Fireball";
 		case pkFireCharge:    return "SmallFireball";
-		case pkEnderPearl:    return "ThrownEnderPearl";
+		case pkEnderPearl:    return "ThrownEnderpearl";
 		case pkExpBottle:     return "ThrownExpBottle";
 		case pkSplashPotion:  return "ThrownPotion";
 		case pkWitherSkull:   return "WitherSkull";

src/Entities/ProjectileEntity.h

@@ -66,8 +66,15 @@ public:
 	/// Returns the kind of the projectile (fast class identification)
 	eKind GetProjectileKind(void) const { return m_ProjectileKind; }
 	
-	/// Returns the entity who created this projectile; may be NULL
-	cEntity * GetCreator(void) { return m_Creator; }
+	/** Returns the entity who created this projectile through running its Unique ID through cWorld::DoWithEntityByID()
+	May return NULL; do not store the returned pointer outside the scope of the tick thread!
+	*/
+	cEntity * GetCreator(void);
+
+	/** Returns the name of the player that created the projectile
+	Will be empty for non-player creators
+	*/
+	AString GetCreatorName(void) const { return m_CreatorData.m_Name; }
 	
 	/// Returns the string that is used as the entity type (class name) in MCA files
 	AString GetMCAClassName(void) const;
@@ -81,10 +88,29 @@ public:
 	void SetIsInGround(bool a_IsInGround) { m_IsInGround = a_IsInGround; }
 	
 protected:
+
+	/** A structure that stores the Entity ID and Playername of the projectile's creator 
+	Used to migitate invalid pointers caused by the creator being destroyed
+	*/
+	struct CreatorData
+	{
+		CreatorData(int a_UniqueID, AString & a_Name) :
+			m_UniqueID(a_UniqueID),
+			m_Name(a_Name)
+		{
+		}
+
+		const int m_UniqueID;
+		AString m_Name;
+	};
+
+	/** The type of projectile I am */
 	eKind m_ProjectileKind;
 	
-	/// The entity who has created this projectile; may be NULL (e. g. for dispensers)
-	cEntity * m_Creator;
+	/** The structure for containing the entity ID and name who has created this projectile
+	The ID and/or name may be NULL (e.g. for dispensers/mobs)
+	*/
+	CreatorData m_CreatorData;
 	
 	/// True if the projectile has hit the ground and is stuck there
 	bool m_IsInGround;

src/Entities/ThrownEnderPearlEntity.cpp

@@ -46,10 +46,12 @@ void cThrownEnderPearlEntity::OnHitEntity(cEntity & a_EntityHit, const Vector3d
 
 void cThrownEnderPearlEntity::TeleportCreator(const Vector3d & a_HitPos)
 {
+	cEntity * Creator = GetCreator();
+
 	// Teleport the creator here, make them take 5 damage:
-	if (m_Creator != NULL)
+	if (Creator != NULL)
 	{
-		m_Creator->TeleportToCoords(a_HitPos.x, a_HitPos.y + 0.2, a_HitPos.z);
-		m_Creator->TakeDamage(dtEnderPearl, this, 5, 0);
+		Creator->TeleportToCoords(a_HitPos.x, a_HitPos.y + 0.2, a_HitPos.z);
+		Creator->TakeDamage(dtEnderPearl, this, 5, 0);
 	}
 }

src/WorldStorage/NBTChunkSerializer.cpp

@@ -619,14 +619,11 @@ void cNBTChunkSerializer::AddProjectileEntity(cProjectileEntity * a_Projectile)
 			{
 				ASSERT(!"Unsaved projectile entity!");
 			}
-		}  // switch (ProjectileKind)
-		cEntity * Creator = a_Projectile->GetCreator();
-		if (Creator != NULL)
+		}  // switch (ProjectileKind)		
+
+		if (!a_Projectile->GetCreatorName().empty())
 		{
-			if (Creator->GetEntityType() == cEntity::etPlayer)
-			{
-				m_Writer.AddString("ownerName", ((cPlayer *)Creator)->GetName());
-			}
+			m_Writer.AddString("ownerName", a_Projectile->GetCreatorName());
 		}
 	m_Writer.EndCompound();
 }