fpc/rtl/objpas/classes/classes.inc

{
    This file is part of the Free Component Library (FCL)
    Copyright (c) 1999-2000 by Michael Van Canneyt and Florian Klaempfl

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 **********************************************************************}

{**********************************************************************
 *       Class implementations are in separate files.                 *
 **********************************************************************}

var
  ClassList : TThreadlist;
  ClassAliasList : TStringList;

{
 Include all message strings

 Add a language with IFDEF LANG_NAME
 just befor the final ELSE. This way English will always be the default.
}

{$IFDEF LANG_GERMAN}
{$i constsg.inc}
{$ELSE}
{$IFDEF LANG_SPANISH}
{$i constss.inc}
{$ENDIF}
{$ENDIF}

{ Utility routines }
{$i util.inc}

{ TBits implementation }
{$i bits.inc}

{ All streams implementations: }
{ Tstreams THandleStream TFileStream TResourcseStreams TStringStream }
{ TCustomMemoryStream TMemoryStream }
{$i streams.inc}

{ TParser implementation}
{$i parser.inc}

{ TCollection and TCollectionItem implementations }
{$i collect.inc}

{ TList and TThreadList implementations }
{$i lists.inc}

{ TStrings and TStringList implementations }
{$i stringl.inc}

{ TThread implementation }

{ system independend threading code }
var
  { event that happens when gui thread is done executing the method}
  ExecuteEvent: PRtlEvent;
  { event executed by synchronize to wake main thread if it sleeps in CheckSynchronize }
  SynchronizeTimeoutEvent: PRtlEvent;
  { guard for synchronization variables }
  SynchronizeCritSect: TRtlCriticalSection;
  { method to execute }
  SynchronizeMethod: TThreadMethod;
  { should we execute the method? }
  DoSynchronizeMethod: boolean;
  { caught exception in gui thread, to be raised in calling thread }
  SynchronizeException: Exception;


function ThreadProc(ThreadObjPtr: Pointer): PtrInt;
  var
    FreeThread: Boolean;
    Thread: TThread absolute ThreadObjPtr;
  begin
    { if Suspend checks FSuspended before doing anything, make sure it }
    { knows we're currently not suspended (this flag may have been set }
    { to true if CreateSuspended was true)                             }
//    Thread.FSuspended:=false;
    // wait until AfterConstruction has been called, so we cannot
    // free ourselves before TThread.Create has finished
    // (since that one may check our VTM in case of $R+, and
    //  will call the AfterConstruction method in all cases)
//    Thread.Suspend;
    try
      Thread.Execute;
    except
      Thread.FFatalException := TObject(AcquireExceptionObject);
    end;
    FreeThread := Thread.FFreeOnTerminate;
    Result := Thread.FReturnValue;
    Thread.FFinished := True;
    Thread.DoTerminate;
    if FreeThread then
      Thread.Free;
    EndThread(Result);
  end;

{ system-dependent code }
{$i tthread.inc}

procedure TThread.Start;
begin
  { suspend/resume are now deprecated in Delphi (they also don't work
    on most platforms in FPC), so a different method was required
    to start a thread if it's create with fSuspended=true -> that's
    what this method is for. }
  Resume;
end;

function TThread.GetSuspended: Boolean;
begin
  GetSuspended:=FSuspended;
end;


procedure TThread.AfterConstruction;
begin
  inherited AfterConstruction;
// enable for all platforms once http://bugs.freepascal.org/view.php?id=16884
// is fixed for all platforms (in case the fix for non-unix platforms also
// requires this field at least)
{$ifdef unix}
  if not FInitialSuspended then
    Resume;
{$endif}
end;


class procedure TThread.Synchronize(AThread: TThread; AMethod: TThreadMethod);
  var
    LocalSyncException: Exception;
  begin
    { do we really need a synchronized call? }
    if GetCurrentThreadID=MainThreadID then
      AMethod()
    else
      begin
        System.EnterCriticalSection(SynchronizeCritSect);
        SynchronizeException:=nil;
        SynchronizeMethod:=AMethod;

        { be careful, after this assignment Method could be already executed }
        DoSynchronizeMethod:=true;

        RtlEventSetEvent(SynchronizeTimeoutEvent);

        if assigned(WakeMainThread) then
          WakeMainThread(AThread);

        { wait infinitely }
        RtlEventWaitFor(ExecuteEvent);
        LocalSyncException:=SynchronizeException;
        System.LeaveCriticalSection(SynchronizeCritSect);
        if assigned(LocalSyncException) then
          raise LocalSyncException;
      end;
  end;


procedure TThread.Synchronize(AMethod: TThreadMethod);
  begin
    TThread.Synchronize(self,AMethod);
  end;


function CheckSynchronize(timeout : longint=0) : boolean;
  { assumes being called from GUI thread }
  begin
    result:=false;
    { first sanity check }
    if Not IsMultiThread then
      Exit
    { second sanity check }
    else if GetCurrentThreadID<>MainThreadID then
      raise EThread.CreateFmt(SCheckSynchronizeError,[GetCurrentThreadID])
    else
      begin
        if timeout>0 then
          begin
            RtlEventWaitFor(SynchronizeTimeoutEvent,timeout);
          end
         else
           RtlEventResetEvent(SynchronizeTimeoutEvent);

        if DoSynchronizeMethod then
          begin
            DoSynchronizeMethod:=false;
            try
              SynchronizeMethod;
              result:=true;
            except
              SynchronizeException:=Exception(AcquireExceptionObject);
            end;
            RtlEventSetEvent(ExecuteEvent);
          end;
      end;
  end;

{ TPersistent implementation }
{$i persist.inc }

{$i sllist.inc}
{$i resref.inc}

{ TComponent implementation }
{$i compon.inc}

{ TBasicAction implementation }
{$i action.inc}

{ TDataModule implementation }
{$i dm.inc}

{ Class and component registration routines }
{$I cregist.inc}



{ Interface related stuff }
{$I intf.inc}

{**********************************************************************
 *       Miscellaneous procedures and functions                       *
 **********************************************************************}

function ExtractStrings(Separators, WhiteSpace: TSysCharSet; Content: PChar; Strings: TStrings): Integer;
var
  b, c : pchar;

  procedure SkipWhitespace;
    begin
      while (c^ in Whitespace) do
        inc (c);
    end;

  procedure AddString;
    var
      l : integer;
      s : string;
    begin
      l := c-b;
      if l > 0 then
        begin
          if assigned(Strings) then
            begin
              setlength(s, l);
              move (b^, s[1],l);
              Strings.Add (s);
            end;
          inc (result);
        end;
    end;

var
  quoted : char;
begin
  result := 0;
  c := Content;
  Quoted := #0;
  Separators := Separators + [#13, #10] - ['''','"'];
  SkipWhitespace;
  b := c;
  while (c^ <> #0) do
    begin
      if (c^ = Quoted) then
        begin
          if ((c+1)^ = Quoted) then
            inc (c)
          else
            Quoted := #0
        end
      else if (Quoted = #0) and (c^ in ['''','"']) then
        Quoted := c^;
      if (Quoted = #0) and (c^ in Separators) then
        begin
          AddString;
          inc (c);
          SkipWhitespace;
          b := c;
        end
      else
        inc (c);
    end;
  if (c <> b) then
    AddString;
end;



{ Point and rectangle constructors }

function Point(AX, AY: Integer): TPoint;

begin
  with Result do
  begin
    X := AX;
    Y := AY;
  end;
end;


function SmallPoint(AX, AY: SmallInt): TSmallPoint;

begin
  with Result do
  begin
    X := AX;
    Y := AY;
  end;
end;


function Rect(ALeft, ATop, ARight, ABottom: Integer): TRect;

begin
  with Result do
  begin
    Left := ALeft;
    Top := ATop;
    Right := ARight;
    Bottom := ABottom;
  end;
end;


function Bounds(ALeft, ATop, AWidth, AHeight: Integer): TRect;

begin
  with Result do
  begin
    Left := ALeft;
    Top := ATop;
    Right := ALeft + AWidth;
    Bottom :=  ATop + AHeight;
  end;
end;


function PointsEqual(const P1, P2: TPoint): Boolean; {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    { lazy, but should work }
    result:=QWord(P1)=QWord(P2);
  end;


function PointsEqual(const P1, P2: TSmallPoint): Boolean; {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    { lazy, but should work }
    result:=DWord(P1)=DWord(P2);
  end;

function InvalidPoint(X, Y: Integer): Boolean;
  begin
    result:=(X=-1) and (Y=-1);
  end;


function InvalidPoint(const At: TPoint): Boolean;
  begin
    result:=(At.x=-1) and (At.y=-1);
  end;


function InvalidPoint(const At: TSmallPoint): Boolean;
  begin
    result:=(At.x=-1) and (At.y=-1);
  end;


{ Object filing routines }

var
  IntConstList: TThreadList;

type
  TIntConst = class
    IntegerType: PTypeInfo;             // The integer type RTTI pointer
    IdentToIntFn: TIdentToInt;          // Identifier to Integer conversion
    IntToIdentFn: TIntToIdent;          // Integer to Identifier conversion
    constructor Create(AIntegerType: PTypeInfo; AIdentToInt: TIdentToInt;
      AIntToIdent: TIntToIdent);
  end;

constructor TIntConst.Create(AIntegerType: PTypeInfo; AIdentToInt: TIdentToInt;
  AIntToIdent: TIntToIdent);
begin
  IntegerType := AIntegerType;
  IdentToIntFn := AIdentToInt;
  IntToIdentFn := AIntToIdent;
end;

procedure RegisterIntegerConsts(IntegerType: Pointer; IdentToIntFn: TIdentToInt;
  IntToIdentFn: TIntToIdent);
begin
  IntConstList.Add(TIntConst.Create(IntegerType, IdentToIntFn, IntToIdentFn));
end;

function FindIntToIdent(AIntegerType: Pointer): TIntToIdent;
var
  i: Integer;
begin
  with IntConstList.LockList do
  try
    for i := 0 to Count - 1 do
      if TIntConst(Items[i]).IntegerType = AIntegerType then
        exit(TIntConst(Items[i]).IntToIdentFn);
    Result := nil;
  finally
    IntConstList.UnlockList;
  end;
end;

function FindIdentToInt(AIntegerType: Pointer): TIdentToInt;
var
  i: Integer;
begin
  with IntConstList.LockList do
  try
    for i := 0 to Count - 1 do
      with TIntConst(Items[I]) do
        if TIntConst(Items[I]).IntegerType = AIntegerType then
          exit(IdentToIntFn);
    Result := nil;
  finally
    IntConstList.UnlockList;
  end;
end;

function IdentToInt(const Ident: String; var Int: LongInt;
  const Map: array of TIdentMapEntry): Boolean;
var
  i: Integer;
begin
  for i := Low(Map) to High(Map) do
    if CompareText(Map[i].Name, Ident) = 0 then
    begin
      Int := Map[i].Value;
      exit(True);
    end;
  Result := False;
end;

function IntToIdent(Int: LongInt; var Ident: String;
  const Map: array of TIdentMapEntry): Boolean;
var
  i: Integer;
begin
  for i := Low(Map) to High(Map) do
    if Map[i].Value = Int then
    begin
      Ident := Map[i].Name;
      exit(True);
    end;
  Result := False;
end;

function GlobalIdentToInt(const Ident: String; var Int: LongInt):boolean;
var
  i : Integer;
begin
  with IntConstList.LockList do
    try
      for i := 0 to Count - 1 do
        if TIntConst(Items[I]).IdentToIntFn(Ident, Int) then
          Exit(True);
      Result := false;
    finally
      IntConstList.UnlockList;
    end;
end;

{ TPropFixup }
// Tainted. TPropFixup is being removed.
 
Type
  TInitHandler = Class(TObject)
    AHandler : TInitComponentHandler;
    AClass : TComponentClass;
  end;

Var
  InitHandlerList : TList;
  FindGlobalComponentList : TList;

procedure RegisterFindGlobalComponentProc(AFindGlobalComponent: TFindGlobalComponent);
  begin
    if not(assigned(FindGlobalComponentList)) then
      FindGlobalComponentList:=TList.Create;
    if FindGlobalComponentList.IndexOf(Pointer(AFindGlobalComponent))<0 then
      FindGlobalComponentList.Add(Pointer(AFindGlobalComponent));
  end;


procedure UnregisterFindGlobalComponentProc(AFindGlobalComponent: TFindGlobalComponent);
  begin
    if assigned(FindGlobalComponentList) then
      FindGlobalComponentList.Remove(Pointer(AFindGlobalComponent));
  end;


function FindGlobalComponent(const Name: string): TComponent;
  var
  	i : sizeint;
  begin
    FindGlobalComponent:=nil;
    if assigned(FindGlobalComponentList) then
      begin
      	for i:=FindGlobalComponentList.Count-1 downto 0 do
      	  begin
      	    FindGlobalComponent:=TFindGlobalComponent(FindGlobalComponentList[i])(name);
      	    if assigned(FindGlobalComponent) then
      	      break;
      	  end;
      end;
  end;


procedure RegisterInitComponentHandler(ComponentClass: TComponentClass;   Handler: TInitComponentHandler);
Var
  I : Integer;
  H: TInitHandler;
begin
  If (InitHandlerList=Nil) then
    InitHandlerList:=TList.Create;
  H:=TInitHandler.Create;
  H.Aclass:=ComponentClass;
  H.AHandler:=Handler;
  try
    With InitHandlerList do
      begin
        I:=0;
        While (I<Count) and not H.AClass.InheritsFrom(TInitHandler(Items[I]).AClass) do
          Inc(I);
        { override? }
        if (I<Count) and (TInitHandler(Items[I]).AClass=H.AClass) then
          begin
            TInitHandler(Items[I]).AHandler:=Handler;
            H.Free;
          end
        else
          InitHandlerList.Insert(I,H);
      end;
   except
     H.Free;
     raise;
  end;
end;


{ all targets should at least include the sysres.inc dummy in the system unit to compile this }
function CreateComponentfromRes(const res : string;Inst : THandle;var Component : TComponent) : Boolean;
  var
    ResStream : TResourceStream;
  begin
    result:=true;

    if Inst=0 then
      Inst:=HInstance;

    try
      ResStream:=TResourceStream.Create(Inst,res,RT_RCDATA);
      try
        Component:=ResStream.ReadComponent(Component);
      finally
        ResStream.Free;
      end;
    except
      on EResNotFound do
        result:=false;
    end;
  end;


function DefaultInitHandler(Instance: TComponent; RootAncestor: TClass): Boolean;

  function doinit(_class : TClass) : boolean;
    begin
      result:=false;
      if (_class.ClassType=TComponent) or (_class.ClassType=RootAncestor) then
        exit;
      result:=doinit(_class.ClassParent);
      result:=CreateComponentfromRes(_class.ClassName,0,Instance) or result;
    end;

  begin
    GlobalNameSpace.BeginWrite;
    try
      result:=doinit(Instance.ClassType);
    finally
      GlobalNameSpace.EndWrite;
    end;
  end;


function InitInheritedComponent(Instance: TComponent; RootAncestor: TClass): Boolean;
Var
  I : Integer;
begin
  I:=0;
  if not Assigned(InitHandlerList) then begin
    Result := True;
    Exit;
  end;
  Result:=False;
  With InitHandlerList do
    begin
    I:=0;
    // Instance is the normally the lowest one, so that one should be used when searching.
    While Not result and (I<Count) do
      begin
      If (Instance.InheritsFrom(TInitHandler(Items[i]).AClass)) then
        Result:=TInitHandler(Items[i]).AHandler(Instance,RootAncestor);
      Inc(I);
      end;
    end;
end;


function InitComponentRes(const ResName: String; Instance: TComponent): Boolean;

begin
  { !!!: Too Win32-specific }
  InitComponentRes := False;
end;


function ReadComponentRes(const ResName: String; Instance: TComponent): TComponent;

begin
  { !!!: Too Win32-specific }
  ReadComponentRes := nil;
end;


function ReadComponentResEx(HInstance: THandle; const ResName: String): TComponent;

begin
  { !!!: Too Win32-specific in VCL }
  ReadComponentResEx := nil;
end;


function ReadComponentResFile(const FileName: String; Instance: TComponent): TComponent;
var
  FileStream: TStream;
begin
  FileStream := TFileStream.Create(FileName, fmOpenRead {!!!:or fmShareDenyWrite});
  try
    Result := FileStream.ReadComponentRes(Instance);
  finally
    FileStream.Free;
  end;
end;


procedure WriteComponentResFile(const FileName: String; Instance: TComponent);
var
  FileStream: TStream;
begin
  FileStream := TFileStream.Create(FileName, fmCreate);
  try
    FileStream.WriteComponentRes(Instance.ClassName, Instance);
  finally
    FileStream.Free;
  end;
end;


Function FindNestedComponent(Root : TComponent; APath : String; CStyle : Boolean = True) : TComponent;

  Function GetNextName : String; {$ifdef CLASSESINLINE} inline; {$endif CLASSESINLINE}
  
  Var
    P : Integer;
    CM : Boolean;
    
  begin
    P:=Pos('.',APath);
    CM:=False;
    If (P=0) then
      begin
      If CStyle then
        begin
        P:=Pos('->',APath);
        CM:=P<>0;
        end;
      If (P=0) Then
        P:=Length(APath)+1;
      end;
    Result:=Copy(APath,1,P-1);
    Delete(APath,1,P+Ord(CM));
  end;

Var
  C : TComponent;
  S : String;
begin
  If (APath='') then
    Result:=Nil
  else
    begin
    Result:=Root;
    While (APath<>'') And (Result<>Nil) do
      begin
      C:=Result;
      S:=Uppercase(GetNextName);
      Result:=C.FindComponent(S);
      If (Result=Nil) And (S='OWNER') then
        Result:=C;
      end;
    end;
end;

threadvar
  GlobalLoaded, GlobalLists: TList;

procedure BeginGlobalLoading;

begin
  if not Assigned(GlobalLists) then
    GlobalLists := TList.Create;
  GlobalLists.Add(GlobalLoaded);
  GlobalLoaded := TList.Create;
end;


{ Notify all global components that they have been loaded completely }
procedure NotifyGlobalLoading;
var
  i: Integer;
begin
  for i := 0 to GlobalLoaded.Count - 1 do
    TComponent(GlobalLoaded[i]).Loaded;
end;


procedure EndGlobalLoading;
begin
  { Free the memory occupied by BeginGlobalLoading }
  GlobalLoaded.Free;
  GlobalLoaded := TList(GlobalLists.Last);
  GlobalLists.Delete(GlobalLists.Count - 1);
  if GlobalLists.Count = 0 then
  begin
    GlobalLists.Free;
    GlobalLists := nil;
  end;
end;


function CollectionsEqual(C1, C2: TCollection): Boolean;
begin
  // !!!: Implement this
  CollectionsEqual:=false;
end;

function CollectionsEqual(C1, C2: TCollection; Owner1, Owner2: TComponent): Boolean;

  procedure stream_collection(s : tstream;c : tcollection;o : tcomponent);
    var
      w : twriter;
    begin
      w:=twriter.create(s,4096);
      try
        w.root:=o;
        w.flookuproot:=o;
        w.writecollection(c);
      finally
        w.free;
      end;
    end;

  var
    s1,s2 : tmemorystream;
  begin
    result:=false;
    if (c1.classtype<>c2.classtype) or
      (c1.count<>c2.count) then
      exit;
    if c1.count = 0 then
      begin
      result:= true;
      exit;
      end;
    s1:=tmemorystream.create;
    try
      s2:=tmemorystream.create;
      try
        stream_collection(s1,c1,owner1);
        stream_collection(s2,c2,owner2);
        result:=(s1.size=s2.size) and (CompareChar(s1.memory^,s2.memory^,s1.size)=0);
      finally
        s2.free;
      end;
    finally
      s1.free;
    end;
  end;


{ Object conversion routines }

type
  CharToOrdFuncty = Function(var charpo: Pointer): Cardinal;

function CharToOrd(var P: Pointer): Cardinal;
begin
  result:= ord(pchar(P)^);
  inc(pchar(P));
end;

function WideCharToOrd(var P: Pointer): Cardinal;
begin
  result:= ord(pwidechar(P)^);
  inc(pwidechar(P));
end;

function Utf8ToOrd(var P:Pointer): Cardinal;
begin
  // Should also check for illegal utf8 combinations
  Result := Ord(PChar(P)^);
  Inc(P);
  if (Result and $80) <> 0 then
    if (Ord(Result) and %11100000) = %11000000 then begin
      Result := ((Result and %00011111) shl 6)
                or (ord(PChar(P)^) and %00111111);
      Inc(P);
    end else if (Ord(Result) and %11110000) = %11100000 then begin
      Result := ((Result and %00011111) shl 12)
                or ((ord(PChar(P)^) and %00111111) shl 6)
                or (ord((PChar(P)+1)^) and %00111111);
      Inc(P,2);
    end else begin
      Result := ((ord(Result) and %00011111) shl 18)
                or ((ord(PChar(P)^) and %00111111) shl 12)
                or ((ord((PChar(P)+1)^) and %00111111) shl 6)
                or (ord((PChar(P)+2)^) and %00111111);
      Inc(P,3);
    end;
end;

procedure ObjectBinaryToText(Input, Output: TStream; Encoding: TObjectTextEncoding);

  procedure OutStr(s: String);
  begin
    if Length(s) > 0 then
      Output.Write(s[1], Length(s));
  end;

  procedure OutLn(s: String);
  begin
    OutStr(s + LineEnding);
  end;

  procedure Outchars(P, LastP : Pointer; CharToOrdFunc: CharToOrdFuncty;
    UseBytes: boolean = false);

  var
    res, NewStr: String;
    w: Cardinal;
    InString, NewInString: Boolean;
  begin
   if p = nil then begin
    res:= '''''';
   end
   else 
    begin
    res := '';
    InString := False;
    while P < LastP do 
      begin
      NewInString := InString;
      w := CharToOrdfunc(P);
      if w = ord('''') then 
        begin //quote char
        if not InString then
          NewInString := True;
        NewStr := '''''';
        end 
      else if (Ord(w) >= 32) and ((Ord(w) < 127) or (UseBytes and (Ord(w)<256))) then
        begin //printable ascii or bytes
        if not InString then
          NewInString := True;
        NewStr := char(w);
        end 
      else 
        begin //ascii control chars, non ascii
        if InString then
          NewInString := False;
        NewStr := '#' + IntToStr(w);
        end;
      if NewInString <> InString then 
        begin
        NewStr := '''' + NewStr;
        InString := NewInString;
        end;
      res := res + NewStr;
      end;
    if InString then 
      res := res + '''';
    end;
   OutStr(res);
  end;

  procedure OutString(s: String);
  begin
    OutChars(Pointer(S),PChar(S)+Length(S),@CharToOrd,Encoding=oteLFM);
  end;

  procedure OutWString(W: WideString);
  begin
    OutChars(Pointer(W),pwidechar(W)+Length(W),@WideCharToOrd);
  end;

  procedure OutUString(W: UnicodeString);
  begin
    OutChars(Pointer(W),pwidechar(W)+Length(W),@WideCharToOrd);
  end;

  procedure OutUtf8Str(s: String);
  begin
    if Encoding=oteLFM then
      OutChars(Pointer(S),PChar(S)+Length(S),@CharToOrd)
    else
      OutChars(Pointer(S),PChar(S)+Length(S),@Utf8ToOrd);
  end;

  function ReadWord : word; {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    Result:=Input.ReadWord;
    Result:=LEtoN(Result);
  end;

  function ReadDWord : longword; {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    Result:=Input.ReadDWord;
    Result:=LEtoN(Result);
  end;

  function ReadQWord : qword; {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    Input.ReadBuffer(Result,sizeof(Result));
    Result:=LEtoN(Result);
  end;

{$ifndef FPUNONE}
  {$IFNDEF FPC_HAS_TYPE_EXTENDED}
  function ExtendedToDouble(e : pointer) : double;
  var mant : qword;
      exp : smallint;
      sign : boolean;
      d : qword;
  begin
    move(pbyte(e)[0],mant,8); //mantissa         : bytes 0..7
    move(pbyte(e)[8],exp,2);  //exponent and sign: bytes 8..9
    mant:=LEtoN(mant);
    exp:=LetoN(word(exp));
    sign:=(exp and $8000)<>0;
    if sign then exp:=exp and $7FFF;
    case exp of
          0 : mant:=0;  //if denormalized, value is too small for double,
                        //so it's always zero
      $7FFF : exp:=2047 //either infinity or NaN
      else
      begin
        dec(exp,16383-1023);
        if (exp>=-51) and (exp<=0) then //can be denormalized
        begin
          mant:=mant shr (-exp);
          exp:=0;
        end
        else
        if (exp<-51) or (exp>2046) then //exponent too large.
        begin
          Result:=0;
          exit;
        end
        else //normalized value
          mant:=mant shl 1; //hide most significant bit
      end;
    end;
    d:=word(exp);
    d:=d shl 52;

    mant:=mant shr 12;
    d:=d or mant;
    if sign then d:=d or $8000000000000000;
    Result:=pdouble(@d)^;
  end;
  {$ENDIF}
{$endif}

  function ReadInt(ValueType: TValueType): Int64;
  begin
    case ValueType of
      vaInt8: Result := ShortInt(Input.ReadByte);
      vaInt16: Result := SmallInt(ReadWord);
      vaInt32: Result := LongInt(ReadDWord);
      vaInt64: Result := Int64(ReadQWord);
    end;
  end;

  function ReadInt: Int64;
  begin
    Result := ReadInt(TValueType(Input.ReadByte));
  end;

{$ifndef FPUNONE}
  function ReadExtended : extended;
  {$IFNDEF FPC_HAS_TYPE_EXTENDED}
  var ext : array[0..9] of byte;
  {$ENDIF}
  begin
    {$IFNDEF FPC_HAS_TYPE_EXTENDED}
    Input.ReadBuffer(ext[0],10);
    Result:=ExtendedToDouble(@(ext[0]));
    {$ELSE}
    Input.ReadBuffer(Result,sizeof(Result));
    {$ENDIF}
  end;
{$endif}

  function ReadSStr: String;
  var
    len: Byte;
  begin
    len := Input.ReadByte;
    SetLength(Result, len);
    if (len > 0) then
      Input.ReadBuffer(Result[1], len);
  end;

  function ReadLStr: String;
  var
    len: DWord;
  begin
    len := ReadDWord;
    SetLength(Result, len);
    if (len > 0) then
      Input.ReadBuffer(Result[1], len);
  end;

  function ReadWStr: WideString;
  var
    len: DWord;
  {$IFDEF ENDIAN_BIG}
    i : integer;
  {$ENDIF}
  begin
    len := ReadDWord;
    SetLength(Result, len);
    if (len > 0) then
    begin
      Input.ReadBuffer(Pointer(@Result[1])^, len*2);
      {$IFDEF ENDIAN_BIG}
      for i:=1 to len do
        Result[i]:=widechar(SwapEndian(word(Result[i])));
      {$ENDIF}
    end;
  end;

  function ReadUStr: UnicodeString;
  var
    len: DWord;
  {$IFDEF ENDIAN_BIG}
    i : integer;
  {$ENDIF}
  begin
    len := ReadDWord;
    SetLength(Result, len);
    if (len > 0) then
    begin
      Input.ReadBuffer(Pointer(@Result[1])^, len*2);
      {$IFDEF ENDIAN_BIG}
      for i:=1 to len do
        Result[i]:=widechar(SwapEndian(word(Result[i])));
      {$ENDIF}
    end;
  end;

  procedure ReadPropList(indent: String);

    procedure ProcessValue(ValueType: TValueType; Indent: String);

      procedure ProcessBinary;
      var
        ToDo, DoNow, i: LongInt;
        lbuf: array[0..31] of Byte;
        s: String;
      begin
        ToDo := ReadDWord;
        OutLn('{');
        while ToDo > 0 do begin
          DoNow := ToDo;
          if DoNow > 32 then DoNow := 32;
          Dec(ToDo, DoNow);
          s := Indent + '  ';
          Input.ReadBuffer(lbuf, DoNow);
          for i := 0 to DoNow - 1 do
            s := s + IntToHex(lbuf[i], 2);
          OutLn(s);
        end;
        OutLn(indent + '}');
      end;

    var
      s: String;
{      len: LongInt; }
      IsFirst: Boolean;
{$ifndef FPUNONE}
      ext: Extended;
{$endif}

    begin
      case ValueType of
        vaList: begin
            OutStr('(');
            IsFirst := True;
            while True do begin
              ValueType := TValueType(Input.ReadByte);
              if ValueType = vaNull then break;
              if IsFirst then begin
                OutLn('');
                IsFirst := False;
              end;
              OutStr(Indent + '  ');
              ProcessValue(ValueType, Indent + '  ');
            end;
            OutLn(Indent + ')');
          end;
        vaInt8: OutLn(IntToStr(ShortInt(Input.ReadByte)));
        vaInt16: OutLn( IntToStr(SmallInt(ReadWord)));
        vaInt32: OutLn(IntToStr(LongInt(ReadDWord)));
        vaInt64: OutLn(IntToStr(Int64(ReadQWord)));
{$ifndef FPUNONE}
        vaExtended: begin
            ext:=ReadExtended;
            Str(ext,S);// Do not use localized strings.
            OutLn(S);
          end;
{$endif}
        vaString: begin
            OutString(ReadSStr);
            OutLn('');
          end;
        vaIdent: OutLn(ReadSStr);
        vaFalse: OutLn('False');
        vaTrue: OutLn('True');
        vaBinary: ProcessBinary;
        vaSet: begin
            OutStr('[');
            IsFirst := True;
            while True do begin
              s := ReadSStr;
              if Length(s) = 0 then break;
              if not IsFirst then OutStr(', ');
              IsFirst := False;
              OutStr(s);
            end;
            OutLn(']');
          end;
        vaLString:
          begin
          OutString(ReadLStr);
          OutLn('');
          end;
        vaWString:
          begin
          OutWString(ReadWStr);
          OutLn('');
          end;
        vaUString:
          begin
          OutWString(ReadWStr);
          OutLn('');
          end;
        vaNil:
          OutLn('nil');
        vaCollection: begin
            OutStr('<');
            while Input.ReadByte <> 0 do begin
              OutLn(Indent);
              Input.Seek(-1, soFromCurrent);
              OutStr(indent + '  item');
              ValueType := TValueType(Input.ReadByte);
              if ValueType <> vaList then
                OutStr('[' + IntToStr(ReadInt(ValueType)) + ']');
              OutLn('');
              ReadPropList(indent + '    ');
              OutStr(indent + '  end');
            end;
            OutLn('>');
          end;
        {vaSingle: begin OutLn('!!Single!!'); exit end;
        vaCurrency: begin OutLn('!!Currency!!'); exit end;
        vaDate: begin OutLn('!!Date!!'); exit end;}
        vaUTF8String: begin
            OutUtf8Str(ReadLStr);
            OutLn('');
          end;
        else
          Raise EReadError.CreateFmt(SErrInvalidPropertyType,[Ord(ValueType)]);
      end;
    end;

  begin
    while Input.ReadByte <> 0 do begin
      Input.Seek(-1, soFromCurrent);
      OutStr(indent + ReadSStr + ' = ');
      ProcessValue(TValueType(Input.ReadByte), Indent);
    end;
  end;

  procedure ReadObject(indent: String);
  var
    b: Byte;
    ObjClassName, ObjName: String;
    ChildPos: LongInt;
  begin
    // Check for FilerFlags
    b := Input.ReadByte;
    if (b and $f0) = $f0 then begin
      if (b and 2) <> 0 then ChildPos := ReadInt;
    end else begin
      b := 0;
      Input.Seek(-1, soFromCurrent);
    end;

    ObjClassName := ReadSStr;
    ObjName := ReadSStr;

    OutStr(Indent);
    if (b and 1) <> 0 then OutStr('inherited')
    else
     if (b and 4) <> 0 then OutStr('inline')
     else OutStr('object');
    OutStr(' ');
    if ObjName <> '' then
      OutStr(ObjName + ': ');
    OutStr(ObjClassName);
    if (b and 2) <> 0 then OutStr('[' + IntToStr(ChildPos) + ']');
    OutLn('');

    ReadPropList(indent + '  ');

    while Input.ReadByte <> 0 do begin
      Input.Seek(-1, soFromCurrent);
      ReadObject(indent + '  ');
    end;
    OutLn(indent + 'end');
  end;

type
  PLongWord = ^LongWord;
const
  signature: PChar = 'TPF0';
  
begin
  if Input.ReadDWord <> PLongWord(Pointer(signature))^ then
    raise EReadError.Create('Illegal stream image' {###SInvalidImage});
  ReadObject('');
end;

procedure ObjectBinaryToText(Input, Output: TStream);
begin
  ObjectBinaryToText(Input,Output,oteDFM);
end;

procedure ObjectTextToBinary(Input, Output: TStream);
var
  parser: TParser;

  procedure WriteWord(w : word); {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    w:=NtoLE(w);
    Output.WriteWord(w);
  end;

  procedure WriteDWord(lw : longword); {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    lw:=NtoLE(lw);
    Output.WriteDWord(lw);
  end;

  procedure WriteQWord(qw : qword); {$ifdef CLASSESINLINE}inline;{$endif CLASSESINLINE}
  begin
    qw:=NtoLE(qw);
    Output.WriteBuffer(qw,sizeof(qword));
  end;

{$ifndef FPUNONE}
  {$IFNDEF FPC_HAS_TYPE_EXTENDED}
  procedure DoubleToExtended(d : double; e : pointer);
  var mant : qword;
      exp : smallint;
      sign : boolean;
  begin
    mant:=(qword(d) and $000FFFFFFFFFFFFF) shl 12;
    exp :=(qword(d) shr 52) and $7FF;
    sign:=(qword(d) and $8000000000000000)<>0;
    case exp of
         0 : begin
               if mant<>0 then  //denormalized value: hidden bit is 0. normalize it
               begin
                 exp:=16383-1022;
                 while (mant and $8000000000000000)=0 do
                 begin
                   dec(exp);
                   mant:=mant shl 1;
                 end;
                 dec(exp); //don't shift, most significant bit is not hidden in extended
               end;
             end;
      2047 : exp:=$7FFF //either infinity or NaN
      else
      begin
        inc(exp,16383-1023);
        mant:=(mant shr 1) or $8000000000000000; //unhide hidden bit
      end;
    end;
    if sign then exp:=exp or $8000;
    mant:=NtoLE(mant);
    exp:=NtoLE(word(exp));
    move(mant,pbyte(e)[0],8); //mantissa         : bytes 0..7
    move(exp,pbyte(e)[8],2);  //exponent and sign: bytes 8..9
  end;
  {$ENDIF}

  procedure WriteExtended(e : extended);
  {$IFNDEF FPC_HAS_TYPE_EXTENDED}
  var ext : array[0..9] of byte;
  {$ENDIF}
  begin
    {$IFNDEF FPC_HAS_TYPE_EXTENDED}
    DoubleToExtended(e,@(ext[0]));
    Output.WriteBuffer(ext[0],10);
    {$ELSE}
    Output.WriteBuffer(e,sizeof(e));
    {$ENDIF}
  end;
{$endif}

  procedure WriteString(s: String);
  var size : byte;
  begin
    if length(s)>255 then size:=255
    else size:=length(s);
    Output.WriteByte(size);
    if Length(s) > 0 then
      Output.WriteBuffer(s[1], size);
  end;

  procedure WriteLString(Const s: String);
  begin
    WriteDWord(Length(s));
    if Length(s) > 0 then
      Output.WriteBuffer(s[1], Length(s));
  end;

  procedure WriteWString(Const s: WideString);
  var len : longword;
  {$IFDEF ENDIAN_BIG}
      i : integer;
      ws : widestring;
  {$ENDIF}
  begin
    len:=Length(s);
    WriteDWord(len);
    if len > 0 then
    begin
      {$IFDEF ENDIAN_BIG}
      setlength(ws,len);
      for i:=1 to len do
        ws[i]:=widechar(SwapEndian(word(s[i])));
      Output.WriteBuffer(ws[1], len*sizeof(widechar));
      {$ELSE}
      Output.WriteBuffer(s[1], len*sizeof(widechar));
      {$ENDIF}
    end;
  end;

  procedure WriteInteger(value: Int64);
  begin
    if (value >= -128) and (value <= 127) then begin
      Output.WriteByte(Ord(vaInt8));
      Output.WriteByte(byte(value));
    end else if (value >= -32768) and (value <= 32767) then begin
      Output.WriteByte(Ord(vaInt16));
      WriteWord(word(value));
    end else if (value >= -2147483648) and (value <= 2147483647) then begin
      Output.WriteByte(Ord(vaInt32));
      WriteDWord(longword(value));
    end else begin
      Output.WriteByte(ord(vaInt64));
      WriteQWord(qword(value));
    end;
  end;

  procedure ProcessWideString(const left : widestring);
  var ws : widestring;
  begin
    ws:=left+parser.TokenWideString;
    while parser.NextToken = '+' do
    begin
      parser.NextToken;   // Get next string fragment
      if not (parser.Token in [toString,toWString]) then
        parser.CheckToken(toWString);
      ws:=ws+parser.TokenWideString;
    end;
    Output.WriteByte(Ord(vaWstring));
    WriteWString(ws);
  end;
  
  procedure ProcessProperty; forward;

  procedure ProcessValue;
  var
{$ifndef FPUNONE}
    flt: Extended;
{$endif}
    s: String;
    stream: TMemoryStream;
  begin
    case parser.Token of
      toInteger:
        begin
          WriteInteger(parser.TokenInt);
          parser.NextToken;
        end;
{$ifndef FPUNONE}
      toFloat:
        begin
          Output.WriteByte(Ord(vaExtended));
          flt := Parser.TokenFloat;
          WriteExtended(flt);
          parser.NextToken;
        end;
{$endif}
      toString:
        begin
          s := parser.TokenString;
          while parser.NextToken = '+' do
          begin
            parser.NextToken;   // Get next string fragment
            case parser.Token of
              toString  : s:=s+parser.TokenString;
              toWString : begin
                            ProcessWideString(s);
                            exit;
                          end
              else parser.CheckToken(toString);
            end;
          end;
          if (length(S)>255) then
          begin
            Output.WriteByte(Ord(vaLString));
            WriteLString(S);
          end
          else
          begin
            Output.WriteByte(Ord(vaString));
            WriteString(s);
          end;
        end;
      toWString:
        ProcessWideString('');
      toSymbol:
        begin
          if CompareText(parser.TokenString, 'True') = 0 then
            Output.WriteByte(Ord(vaTrue))
          else if CompareText(parser.TokenString, 'False') = 0 then
            Output.WriteByte(Ord(vaFalse))
          else if CompareText(parser.TokenString, 'nil') = 0 then
            Output.WriteByte(Ord(vaNil))
          else
          begin
            Output.WriteByte(Ord(vaIdent));
            WriteString(parser.TokenComponentIdent);
          end;
          Parser.NextToken;
        end;
      // Set
      '[':
        begin
          parser.NextToken;
          Output.WriteByte(Ord(vaSet));
          if parser.Token <> ']' then
            while True do
            begin
              parser.CheckToken(toSymbol);
              WriteString(parser.TokenString);
              parser.NextToken;
              if parser.Token = ']' then
                break;
              parser.CheckToken(',');
              parser.NextToken;
            end;
          Output.WriteByte(0);
          parser.NextToken;
        end;
      // List
      '(':
        begin
          parser.NextToken;
          Output.WriteByte(Ord(vaList));
          while parser.Token <> ')' do
            ProcessValue;
          Output.WriteByte(0);
          parser.NextToken;
        end;
      // Collection
      '<':
        begin
          parser.NextToken;
          Output.WriteByte(Ord(vaCollection));
          while parser.Token <> '>' do
          begin
            parser.CheckTokenSymbol('item');
            parser.NextToken;
            // ConvertOrder
            Output.WriteByte(Ord(vaList));
            while not parser.TokenSymbolIs('end') do
              ProcessProperty;
            parser.NextToken;   // Skip 'end'
            Output.WriteByte(0);
          end;
          Output.WriteByte(0);
          parser.NextToken;
        end;
      // Binary data
      '{':
        begin
          Output.WriteByte(Ord(vaBinary));
          stream := TMemoryStream.Create;
          try
            parser.HexToBinary(stream);
            WriteDWord(stream.Size);
            Output.WriteBuffer(Stream.Memory^, stream.Size);
          finally
            stream.Free;
          end;
          parser.NextToken;
        end;
      else
        parser.Error(SInvalidProperty);
    end;
  end;

  procedure ProcessProperty;
  var
    name: String;
  begin
    // Get name of property
    parser.CheckToken(toSymbol);
    name := parser.TokenString;
    while True do begin
      parser.NextToken;
      if parser.Token <> '.' then break;
      parser.NextToken;
      parser.CheckToken(toSymbol);
      name := name + '.' + parser.TokenString;
    end;
    WriteString(name);
    parser.CheckToken('=');
    parser.NextToken;
    ProcessValue;
  end;

  procedure ProcessObject;
  var
    Flags: Byte;
    ObjectName, ObjectType: String;
    ChildPos: Integer;
  begin
    if parser.TokenSymbolIs('OBJECT') then
      Flags :=0  { IsInherited := False }
    else begin
      if parser.TokenSymbolIs('INHERITED') then
        Flags := 1 { IsInherited := True; }
      else begin
        parser.CheckTokenSymbol('INLINE');
        Flags := 4;
      end;
    end;
    parser.NextToken;
    parser.CheckToken(toSymbol);
    ObjectName := '';
    ObjectType := parser.TokenString;
    parser.NextToken;
    if parser.Token = ':' then begin
      parser.NextToken;
      parser.CheckToken(toSymbol);
      ObjectName := ObjectType;
      ObjectType := parser.TokenString;
      parser.NextToken;
      if parser.Token = '[' then begin
        parser.NextToken;
        ChildPos := parser.TokenInt;
        parser.NextToken;
        parser.CheckToken(']');
        parser.NextToken;
        Flags := Flags or 2;
      end;
    end;
    if Flags <> 0 then begin
      Output.WriteByte($f0 or Flags);
      if (Flags and 2) <> 0 then
        WriteInteger(ChildPos);
    end;
    WriteString(ObjectType);
    WriteString(ObjectName);

    // Convert property list
    while not (parser.TokenSymbolIs('END') or
      parser.TokenSymbolIs('OBJECT') or
      parser.TokenSymbolIs('INHERITED') or
      parser.TokenSymbolIs('INLINE')) do
      ProcessProperty;
    Output.WriteByte(0);        // Terminate property list

    // Convert child objects
    while not parser.TokenSymbolIs('END') do ProcessObject;
    parser.NextToken;           // Skip end token
    Output.WriteByte(0);        // Terminate property list
  end;

const
  signature: PChar = 'TPF0';
begin
  parser := TParser.Create(Input);
  try
    Output.WriteBuffer(signature[0], 4);
    ProcessObject;
  finally
    parser.Free;
  end;
end;


procedure ObjectResourceToText(Input, Output: TStream);
begin
  Input.ReadResHeader;
  ObjectBinaryToText(Input, Output);
end;


procedure ObjectTextToResource(Input, Output: TStream);
var
  StartPos, FixupInfo: LongInt;
  parser: TParser;
  name: String;
begin
  // Get form type name
  StartPos := Input.Position;
  parser := TParser.Create(Input);
  try
    if not parser.TokenSymbolIs('OBJECT') then parser.CheckTokenSymbol('INHERITED');
    parser.NextToken;
    parser.CheckToken(toSymbol);
    parser.NextToken;
    parser.CheckToken(':');
    parser.NextToken;
    parser.CheckToken(toSymbol);
    name := parser.TokenString;
  finally
    parser.Free;
    Input.Position := StartPos;
  end;

  name := UpperCase(name);
  Output.WriteResourceHeader(name,FixupInfo); // Write resource header
  ObjectTextToBinary(Input, Output);          // Convert the stuff!
  Output.FixupResourceHeader(FixupInfo);      // Insert real resource data size
end;



{ Utility routines }

function LineStart(Buffer, BufPos: PChar): PChar;

begin
  Result := BufPos;
  while Result > Buffer do begin
    Dec(Result);
    if Result[0] = #10 then break;
  end;
end;

procedure CommonInit;
begin
  InitCriticalSection(SynchronizeCritSect);
  ExecuteEvent:=RtlEventCreate;
  SynchronizeTimeoutEvent:=RtlEventCreate;
  DoSynchronizeMethod:=false;
  MainThreadID:=GetCurrentThreadID;
  InitCriticalsection(ResolveSection);
  InitHandlerList:=Nil;
  FindGlobalComponentList:=nil;
  IntConstList := TThreadList.Create;
  ClassList := TThreadList.Create;
  ClassAliasList := TStringList.Create;
  { on unix this maps to a simple rw synchornizer }
  GlobalNameSpace := TMultiReadExclusiveWriteSynchronizer.Create;
  RegisterInitComponentHandler(TComponent,@DefaultInitHandler);
end;

procedure CommonCleanup;
var
  i: Integer;
begin
  GlobalNameSpace.BeginWrite;
  with IntConstList.LockList do
    try
      for i := 0 to Count - 1 do
        TIntConst(Items[I]).Free;
    finally
      IntConstList.UnlockList;
    end;
    IntConstList.Free;
  ClassList.Free;
  ClassAliasList.Free;
  RemoveFixupReferences(nil, '');
  DoneCriticalsection(ResolveSection);
  GlobalLists.Free;
  ComponentPages.Free;
  FreeAndNil(NeedResolving);
  { GlobalNameSpace is an interface so this is enough }
  GlobalNameSpace:=nil;

  if (InitHandlerList<>Nil) then
    for i := 0 to InitHandlerList.Count - 1 do
      TInitHandler(InitHandlerList.Items[I]).Free;
  InitHandlerList.Free;
  InitHandlerList:=Nil;
  FindGlobalComponentList.Free;
  FindGlobalComponentList:=nil;
  DoneCriticalSection(SynchronizeCritSect);
  RtlEventDestroy(ExecuteEvent);
  RtlEventDestroy(SynchronizeTimeoutEvent);
end;

{ TFiler implementation }
{$i filer.inc}

{ TReader implementation }
{$i reader.inc}

{ TWriter implementations }
{$i writer.inc}
{$i twriter.inc}