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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.
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