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dwgproc.pp
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dwgproc.pp
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{*************************************************************************** }
{ gfdwg - free implementation of the DWG file format based on LibreDWG }
{ }
{ Copyright (C) 2022 Andrey Zubarev <zamtmn@yandex.ru> }
{ }
{ This library is free software, licensed under the terms of the GNU }
{ General Public License as published by the Free Software Foundation, }
{ either version 3 of the License, or (at your option) any later version. }
{ You should have received a copy of the GNU General Public License }
{ along with this program. If not, see <http://www.gnu.org/licenses/>. }
{*************************************************************************** }
unit dwgproc;
{$IFDEF FPC}
{$PACKRECORDS C}
{$MACRO ON}
{$IFDEF Windows}
{$DEFINE extdecl := stdcall}
{$ELSE}
{$DEFINE extdecl := cdecl}
{$ENDIF}
{$Mode objfpc}{$H+}
{$ModeSwitch advancedrecords}
{$ENDIF}
interface
uses
SysUtils, ctypes, dynlibs, dwg, ghashmap, TypInfo;
resourcestring
rsHandlerAlreadyReg='Handler already registered for %d';
rsCouldNotLoadLib='Could not load library: %s';
const
{$if defined(Windows)}
LibreDWG_Lib = 'libredwg-0.dll';
{$elseif defined(OS2)}
//LibreDWG_Lib = '';
{$elseif defined(darwin)}
//LibreDWG_LIB = '';
{$elseif defined(haiku) or defined(OpenBSD)}
//LibreDWG_LIB = '';
{$elseif defined(MorphOS)}
//LibreDWG_LIB = '';
{$else}
LibreDWG_LIB = 'libredwg.so';
{$endif}
type
TDWGCtx=record
DWG:Dwg_Data;
DWGVer:DWG_VERSION_TYPE;
procedure CreateRec(var ADWG:Dwg_Data);
end;
TData=Pointer;
TCounter=Integer;
TProcessLongProcess=procedure(const Data:TData;const Counter:TCounter);
HashDWG_OBJECT_TYPE=class
class function hash(dot:DWG_OBJECT_TYPE; n:longint):SizeUInt;
end;
generic GDWGParser<GUserCtx>=class
type
TDWGObjectLoadProc=procedure(var ZContext:GUserCtx;var DWGContext:TDWGCtx;var DWGObject:Dwg_Object;P:Pointer);
PTDWGObjectData=^TDWGObjectData;
TDWGObjectData=record
LoadEntityProc:TDWGObjectLoadProc;
LoadObjectProc:TDWGObjectLoadProc;
procedure Create;
end;
//work in fpc3.2.2
//TDWGObjectsDataDict=class (specialize TDictionary<DWG_OBJECT_TYPE,TDWGObjectData>)
// function GetMutableValue(key:DWG_OBJECT_TYPE; out PAValue:PTDWGObjectData):boolean;
//end;
TDWGObjectsDataDict=specialize THashmap<DWG_OBJECT_TYPE,TDWGObjectData,HashDWG_OBJECT_TYPE>;
var
DWGObj2LPDict:TDWGObjectsDataDict;
constructor create;
destructor destroy;override;
procedure RegisterDWGEntityLoadProc(const DOT:DWG_OBJECT_TYPE;const LP:TDWGObjectLoadProc);
procedure RegisterDWGObjectLoadProc(const DOT:DWG_OBJECT_TYPE;const LP:TDWGObjectLoadProc);
procedure parseDwg_Data(var ZContext:GUserCtx;var dwg:Dwg_Data;const lpp:TProcessLongProcess;const data:TData);
end;
var
dwg_read_file : function(const filename:pchar;
dwg:PDwg_Data):integer;extdecl;
dxf_read_file : function(const filename:pchar;
dwg:PDwg_Data):integer;extdecl;
dwg_free : procedure(dwg:PDwg_Data);extdecl;
procedure FreeLibreDWG;
procedure LoadLibreDWG(lib : pchar = LibreDWG_Lib; reloadlib : Boolean = False);
procedure BITCODE_T2Text(const p:BITCODE_T;constref DWGContext:TDWGCtx;out text:string);
function DWG_V2Str(v:DWG_VERSION_TYPE):string;
implementation
var
hlib : tlibhandle;
class function HashDWG_OBJECT_TYPE.hash(dot:DWG_OBJECT_TYPE; n:longint):SizeUInt;
begin
result:=ord(dot) mod SizeUInt(n);
end;
procedure TDWGCtx.CreateRec(var ADWG:Dwg_Data);
begin
DWG:=ADWG;
DWGVer:=ADWG.HEADER.version;
if DWGVer=R_INVALID then
DWGVer:=ADWG.HEADER.from_version;
end;
procedure GDWGParser.TDWGObjectData.Create;
begin
LoadEntityProc:=nil;
LoadObjectProc:=nil;
end;
procedure GDWGParser.RegisterDWGEntityLoadProc(const DOT:DWG_OBJECT_TYPE;const LP:TDWGObjectLoadProc);
var
pdod:PTDWGObjectData;
dod:TDWGObjectData;
begin
//work in fpc3.2.2
//if DWGObj2LPDict.GetMutableValue(DOT,pdod) then begin
// if pdod^.LoadEntityProc<>nil then
// raise Exception.Create(format(rsHandlerAlreadyReg,[DOT]))
// else begin
// pdod^.LoadEntityProc:=LP;
// pdod^.LoadObjectProc:=nil;
// end;
//end else begin
dod.Create;
dod.LoadEntityProc:=LP;
dod.LoadObjectProc:=nil;
DWGObj2LPDict.insert(DOT,dod);
//end;
end;
procedure GDWGParser.RegisterDWGObjectLoadProc(const DOT:DWG_OBJECT_TYPE;const LP:TDWGObjectLoadProc);
var
pdod:PTDWGObjectData;
dod:TDWGObjectData;
begin
//work in fpc3.2.2
//if DWGObj2LPDict.GetMutableValue(DOT,pdod) then begin
// if pdod^.LoadEntityProc<>nil then
// raise Exception.Create(format(rsHandlerAlreadyReg,[DOT]))
// else begin
// pdod^.LoadEntityProc:=nil;
// pdod^.LoadObjectProc:=LP;
// end;
//end else begin
dod.Create;
dod.LoadEntityProc:=nil;
dod.LoadObjectProc:=LP;
DWGObj2LPDict.insert(DOT,dod);
//end;
end;
procedure GDWGParser.parseDwg_Data(var ZContext:GUserCtx;var dwg:Dwg_Data;const lpp:TProcessLongProcess;const data:TData);
//work in fpc3.2.2
//var
// i:BITCODE_BL;
// pdod:PTDWGObjectData;
// DWGContext:TDWGCtx;
//begin
// DWGContext.CreateRec(dwg);
// if DWGObj2LPDict<>nil then begin
// i:=0;
// while (i<dwg.num_objects) do begin
// if DWGObj2LPDict.GetMutableValue(dwg.&object[i].fixedtype,pdod) then begin
// if pdod^.LoadEntityProc<>nil then
// pdod^.LoadEntityProc(ZContext,DWGContext,dwg.&object[i],dwg.&object[i].tio.entity^.tio.UNUSED)
// else if pdod^.LoadObjectProc<>nil then
// pdod^.LoadObjectProc(ZContext,DWGContext,dwg.&object[i],dwg.&object[i].tio.&object^.tio.DUMMY);
// end;
// if @lpp<>nil then
// lpp(data,i);
// inc(i);
// end;
// end;
//end;
var
i:BITCODE_BL;
dod:TDWGObjectData;
DWGContext:TDWGCtx;
begin
DWGContext.CreateRec(dwg);
if DWGObj2LPDict<>nil then begin
i:=0;
while (i<dwg.num_objects) do begin
if DWGObj2LPDict.GetValue(dwg.&object[i].fixedtype,dod) then begin
if dod.LoadEntityProc<>nil then
dod.LoadEntityProc(ZContext,DWGContext,dwg.&object[i],dwg.&object[i].tio.entity^.tio.UNUSED)
else if dod.LoadObjectProc<>nil then
dod.LoadObjectProc(ZContext,DWGContext,dwg.&object[i],dwg.&object[i].tio.&object^.tio.DUMMY);
end;
if @lpp<>nil then
lpp(data,i);
inc(i);
end;
end;
end;
//work in fpc3.2.2
//function GDWGParser.TDWGObjectsDataDict.GetMutableValue(key:DWG_OBJECT_TYPE; out PAValue:PTDWGObjectData):Boolean;
//var
// LIndex: SizeInt;
// LHash: UInt32;
//begin
// LIndex := FindBucketIndex(FItems, key, LHash);
//
// if LIndex < 0 then begin
// result:=false;
// PAValue:=nil;
// end else begin
// result:=true;
// PAValue:=@FItems[LIndex].Pair.Value;
// end;
//end;
constructor GDWGParser.create;
begin
DWGObj2LPDict:=TDWGObjectsDataDict.create;
end;
destructor GDWGParser.destroy;
begin
DWGObj2LPDict.Free;
end;
function DWG_V2Str(v:DWG_VERSION_TYPE):string;
begin
if Ord(v)>Ord(R_AFTER)then
v:=R_AFTER;
result:=GetEnumName(typeinfo(v),Ord(v));
end;
procedure BITCODE_T2Text(const p:BITCODE_T;constref DWGContext:TDWGCtx;out text:string);
begin
if DWGContext.dwg.header.version<=R_2004 then
text:=pchar(p)
else
text:=punicodechar(p)
end;
procedure FreeLibreDWG;
begin
if (hlib <> 0) then
FreeLibrary(hlib);
hlib:=0;
dwg_read_file:=nil;
dxf_read_file:=nil;
dwg_free:=nil;
end;
procedure LoadLibreDWG(lib : pchar = LibreDWG_Lib; reloadlib : Boolean = False);
begin
if reloadlib then
FreeLibreDWG;
if hlib = 0 then begin
hlib:=LoadLibrary(lib);
pointer(dwg_read_file):=GetProcAddress(hlib,'dwg_read_file');
pointer(dxf_read_file):=GetProcAddress(hlib,'dxf_read_file');
pointer(dwg_free):=GetProcAddress(hlib,'dwg_free');
end;
if hlib=0 then
raise Exception.Create(format(rsCouldNotLoadLib,[lib]));
end;
initialization
hlib:=0;
FreeLibreDWG;
finalization
FreeLibreDWG;
end.