1 files changed, 326 insertions, 0 deletions
diff --git a/Game/Code/Classes/UServices.pas b/Game/Code/Classes/UServices.pas
new file mode 100644
index 00000000..be1fcf2c
--- /dev/null
+++ b/Game/Code/Classes/UServices.pas
@@ -0,0 +1,326 @@
+unit UServices;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses uPluginDefs,
+     SysUtils;
+{*********************
+  TServiceManager
+  Class for saving, managing and calling of Services.
+  Saves all Services and their Procs
+*********************}
+
+type
+  TServiceName = String[60];
+  PServiceInfo = ^TServiceInfo;
+  TServiceInfo = record
+    Self: THandle; //Handle of this Service
+    Hash: Integer; //4 Bit Hash of the Services Name
+    Name: TServiceName; //Name of this Service
+
+    Owner: Integer; //If < 0 [-(DLLMan Pluginindex + 1)]; 0 - undefined, On Error Full shutdown, If < 0 [ModuleIndex - 1]  
+    
+    Next: PServiceInfo; //Pointer to the Next Service in teh list
+
+    //Here is s/t tricky
+    //To avoid writing of Wrapping Functions to offer a Service from a Class
+    //We save a Normal Proc or a Method of a Class
+    Case isClass: boolean of
+      False: (Proc: TUS_Service); //Proc that will be called on Event
+      True:  (ProcOfClass: TUS_Service_of_Object);
+  end;
+
+  TServiceManager = class
+    private
+      //Managing Service List
+      FirstService: PServiceInfo;
+      LastService: PServiceInfo;
+
+      //Some Speed improvement by caching the last 4 called Services
+      //Most of the time a Service is called multiple times
+      ServiceCache: Array[0..3] of PServiceInfo;
+      NextCacheItem: Byte;
+
+      //Next Service added gets this Handle:
+      NextHandle: THandle;
+    public
+      Constructor Create;
+
+      Function AddService(const ServiceName: PChar; const Proc: TUS_Service = nil; const ProcofClass: TUS_Service_of_Object = nil): THandle;
+      Function DelService(const hService: THandle): integer;
+
+      Function CallService(const ServiceName: PChar; const wParam: TwParam; lParam: TlParam): integer;
+
+      Function NametoHash(const ServiceName: TServiceName): Integer;
+      Function ServiceExists(const ServiceName: PChar): Integer;
+  end;
+
+var
+  ServiceManager: TServiceManager; 
+
+implementation
+uses UCore;
+
+//------------
+// Create - Creates Class and Set Standard Values
+//------------
+Constructor TServiceManager.Create;
+begin
+  FirstService := nil;
+  LastService := nil;
+
+  ServiceCache[0] := nil;
+  ServiceCache[1] := nil;
+  ServiceCache[2] := nil;
+  ServiceCache[3] := nil;
+
+  NextCacheItem := 0;
+
+  NextHandle := 1;
+
+  {$IFDEF DEBUG}
+    WriteLn('ServiceManager: Succesful created!');
+  {$ENDIF}
+end;
+
+//------------
+// Function Creates a new Service and Returns the Services Handle,
+// 0 on Failure. (Name already exists)
+//------------
+Function TServiceManager.AddService(const ServiceName: PChar;  const Proc: TUS_Service; const ProcofClass: TUS_Service_of_Object): THandle;
+var
+  Cur: PServiceInfo;
+begin
+  Result := 0;
+
+  If (@Proc <> nil) or (@ProcOfClass <> nil) then
+  begin
+    If (ServiceExists(ServiceName) = 0) then
+    begin //There is a Proc and the Service does not already exist
+      //Ok Add it!
+      
+      //Get Memory
+      GetMem(Cur, SizeOf(TServiceInfo));
+
+      //Fill it with Data
+      Cur.Next := nil;
+
+      If (@Proc = nil) then
+      begin //Use the ProcofClass Method
+        Cur.isClass := True;
+        Cur.ProcOfClass := ProcofClass;
+      end
+      else //Use the normal Proc
+      begin
+        Cur.isClass := False;
+        Cur.Proc := Proc;
+      end;
+
+      Cur.Self := NextHandle;
+      //Zero Name
+      Cur.Name := #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0;
+      Cur.Name := String(ServiceName);
+      Cur.Hash := NametoHash(Cur.Name);
+
+      //Add Owner to Service
+      Cur.Owner := Core.CurExecuted;
+
+      //Add Service to the List
+      If (FirstService = nil) then
+        FirstService := Cur;
+
+      If (LastService <> nil) then
+        LastService.Next := Cur;
+
+      LastService := Cur;
+
+      {$IFDEF DEBUG}
+      WriteLn('ServiceManager: Service added: ''' + ServiceName + ''', Handle: ' + InttoStr(Cur.Self));
+      {$ENDIF}
+
+      //Inc Next Handle
+      Inc(NextHandle);
+    end
+    {$IFDEF DEBUG}
+    else WriteLn('ServiceManager: Try to readd Service: ' + ServiceName);
+    {$ENDIF}
+  end;
+end;
+
+//------------
+// Function Destroys a Service, 0 on success, not 0 on Failure
+//------------
+Function TServiceManager.DelService(const hService: THandle): integer;
+var
+  Last, Cur: PServiceInfo;
+  I: Integer;
+begin
+  Result := -1;
+
+  Last := nil;
+  Cur := FirstService;
+
+  //Search for Service to Delete
+  While (Cur <> nil) do
+  begin
+    If (Cur.Self = hService) then
+    begin //Found Service => Delete it
+
+      //Delete from List
+      If (Last = nil) then //Found first Service
+        FirstService := Cur.Next
+      Else //Service behind the first
+        Last.Next := Cur.Next;
+
+      //IF this is the LastService, correct LastService
+      If (Cur = LastService) then
+        LastService := Last;
+
+      //Search for Service in Cache and delete it if found
+      For I := 0 to High(ServiceCache) do
+        If (ServiceCache[I] = Cur) then
+        begin
+          ServiceCache[I] := nil;
+        end;
+
+      {$IFDEF DEBUG}
+      WriteLn('ServiceManager: Removed Service succesful: ' + Cur.Name);
+      {$ENDIF}
+
+      //Free Memory
+      Freemem(Cur, SizeOf(TServiceInfo));
+
+      //Break the Loop
+      Break;
+    end;
+
+    //Go to Next Service
+    Last := Cur;
+    Cur := Cur.Next;
+  end;
+end;
+
+//------------
+// Function Calls a Services Proc
+// Returns Services Return Value or SERVICE_NOT_FOUND on Failure
+//------------
+Function TServiceManager.CallService(const ServiceName: PChar; const wParam: TwParam; lParam: TlParam): integer;
+var
+  SExists: Integer;
+  Service: PServiceInfo;
+  CurExecutedBackup: Integer; //backup of Core.CurExecuted Attribute
+begin
+  Result := SERVICE_NOT_FOUND;
+  SExists := ServiceExists(ServiceName);
+  If (SExists <> 0) then
+  begin
+    //Backup CurExecuted
+    CurExecutedBackup := Core.CurExecuted;
+    
+    Service := Pointer(SExists);
+
+    If (Service.isClass) then
+      //Use Proc of Class
+      Result := Service.ProcOfClass(wParam, lParam)
+    Else
+      //Use normal Proc
+      Result := Service.Proc(wParam, lParam);
+
+    //Restore CurExecuted
+    Core.CurExecuted := CurExecutedBackup;
+  end;
+
+  {$IFDEF DEBUG}
+  WriteLn('ServiceManager: Service ''' + ServiceName + ''' called. Result: ' + InttoStr(Result));
+  {$ENDIF}
+end;
+
+//------------
+// Generates the Hash for the given Name
+//------------
+Function TServiceManager.NametoHash(const ServiceName: TServiceName): Integer;
+asm
+  { CL: Counter; EAX: Result; EDX: Current Memory Address }
+  Mov ECX, 14 {Init Counter, Fold 14 Times to get 4 Bytes out of 60}
+
+  Mov EDX, ServiceName {Save Address of String that should be "Hashed"}
+
+  Mov EAX, [EDX]
+
+  @FoldLoop: ADD EDX, 4 {jump 4 Byte(32 Bit) to the next tile }
+             ADD EAX, [EDX] {Add the Value of the next 4 Byte of the String to the Hash}
+
+  LOOP @FoldLoop {Fold again if there are Chars Left}
+end;
+
+
+//------------
+// Function Returns Non Zero if a Service with the given Name Exists, otherwise 0
+//------------
+Function TServiceManager.ServiceExists(const ServiceName: PChar): Integer;
+var
+  Name: TServiceName;
+  Hash: Integer;
+  Cur: PServiceInfo;
+  I: Byte;
+begin
+  Result := 0;
+  // to-do : Write a Metbod (in ASM) to Zero and Add in one turn  (faster then this dirty hack ;)
+  //Zero Name:
+  Name := #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0 + #0;
+  //Add Service Name
+  Name := String(ServiceName);
+  Hash := NametoHash(Name);
+
+  //First of all Look for the Service in Cache
+  For I := 0 to High(ServiceCache) do
+  begin
+    If (ServiceCache[I] <> nil) AND (ServiceCache[I].Hash = Hash) then
+    begin
+      If (ServiceCache[I].Name = Name) then
+      begin //Found Service in Cache
+        Result := Integer(ServiceCache[I]);
+
+        {$IFDEF DEBUG}
+        WriteLn('ServiceManager: Found Service in Cache: ''' + ServiceName + '''');
+        {$ENDIF}
+
+        Break;
+      end;
+    end;
+  end;
+
+  If (Result = 0) then
+  begin
+    Cur := FirstService;
+    While (Cur <> nil) do
+    begin
+      If (Cur.Hash = Hash) then
+      begin
+        If (Cur.Name = Name) then
+        begin //Found the Service
+          Result := Integer(Cur);
+
+          {$IFDEF DEBUG}
+          WriteLn('ServiceManager: Found Service in List: ''' + ServiceName + '''');
+          {$ENDIF}
+
+          //Add to Cache
+          ServiceCache[NextCacheItem] := Cur;
+          NextCacheItem := (NextCacheItem + 1) AND 3;
+          Break;
+        end;
+      end;
+
+      Cur := Cur.Next;
+    end;
+  end;
+end;
+
+end.