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Simba/Units/MMLCore/libloader.pas

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unit libloader;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, dynlibs;
type
TGenericLib = record
filename: string;
handle: TLibHandle;
end;
TGenericLibArray = array of TGenericLib;
{ TGenericLoader }
TGenericLoader = class(TObject)
private
PluginLen : integer;
Loaded: TGenericLibArray;
PluginDirs : TStringList;
procedure FreePlugins;
procedure LoadPluginsDir(DirIndex : integer);
function VerifyPath(Path : string) : string;
function LoadPluginNoFallback(PluginName : string) : integer;
protected
function InitPlugin(plugin: TLibHandle): boolean; virtual; abstract;
public
constructor Create;
destructor Destroy; override;
procedure ValidateDirs;
procedure AddPath(path: string);
function LoadPlugin(PluginName : string) : integer;
end;
implementation
uses
MufasaTypes,MufasaBase,FileUtil;
procedure TGenericLoader.AddPath(path: string);
var
idx: integer;
verified : string;
begin
verified := VerifyPath(path);
//IDK who changed this to loading a dir, but DON'T
if not PluginDirs.Find(verified,idx) then
begin
mDebugLn('Adding Plugin Path: ' + verified);
PluginDirs.Add(verified);
end;
end;
procedure TGenericLoader.FreePlugins;
var
I : integer;
begin
for i := 0 to PluginLen - 1 do
begin;
if (Loaded[i].handle > 0) then
try
mDebugLn('Freeing plugin[%d]',[i]);
FreeLibrary(Loaded[i].handle);
except
end;
end;
SetLength(Loaded,0);
PluginLen:= 0;
end;
procedure TGenericLoader.ValidateDirs;
var
i : integer;
begin
for i := 0 to PluginDirs.Count - 1 do
begin;
if DirectoryExists(PluginDirs[i]) = false then
raise Exception.createFMT('Directory(%s) does not exist',[PluginDirs[i]]);
PluginDirs[i] := VerifyPath(PluginDirs[i]);
end;
end;
procedure TGenericLoader.LoadPluginsDir(DirIndex: integer);
var
PlugExt: String = {$IFDEF LINUX}'*.so';{$ELSE}'*.dll';{$ENDIF}
FileSearcher : TSearchRec;
begin
if (DirIndex < 0) or (DirIndex >= PluginDirs.Count) then
Exit;
if FindFirst(PluginDirs.Strings[DirIndex] + PlugExt, faAnyFile, FileSearcher) <> 0 then
begin;
FindClose(FileSearcher);
Exit;
end;
repeat
LoadPlugin(FileSearcher.Name);
until FindNext(FileSearcher) <> 0;
FindClose(FileSearcher);
end;
function TGenericLoader.VerifyPath(Path: string): string;
begin
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if (@path = nil) or (path = '') then
exit('');
Result := Path;
if (Result[Length(Result)] <> DS) then
begin;
if (Result[Length(Result)] = '\') or (Result[Length(Result)] = '/') then
Result[Length(Result)] := DS
else
Result := Result + DS;
end;
end;
function TGenericLoader.LoadPluginNoFallback(PluginName: string): Integer;
var
i, ii : integer;
PlugExt: String = {$IFDEF LINUX}'.so';{$ELSE}'.dll';{$ENDIF}
begin
ii := -1;
result := -1;
if PluginDirs.Count = 0 then
Exit;
ValidateDirs;
PluginName := ExtractFileNameWithoutExt(PluginName);
for i := 0 to PluginDirs.Count - 1 do
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if FileExistsUTF8(PluginDirs.Strings[i] + Pluginname + PlugExt) then
begin;
if ii <> -1 then
Raise Exception.CreateFmt('Plugin(%s) has been found multiple times',[PluginName]);
ii := i;
end;
if ii = -1 then
raise Exception.CreateFMT('Plugin(%s) has not been found',[PluginName]);
for i := 0 to PluginLen - 1 do
if Loaded[i].filename = (PluginDirs.Strings[ii] + PluginName + PlugExt) then
Exit(i);
SetLength(Loaded,PluginLen + 1);
mDebugLn(Format('Loading plugin %s at %s',[PluginName,PluginDirs.Strings[ii]]));
Loaded[PluginLen].filename:= PluginDirs.Strings[ii] + Pluginname + PlugExt;
Loaded[PluginLen].handle:= LoadLibrary(Loaded[PluginLen].filename);
if Loaded[PluginLen].handle = 0 then
Raise Exception.CreateFMT('Error loading plugin %s',[Loaded[PluginLen].filename]);
if InitPlugin(Loaded[PluginLen].handle) then
inc(PluginLen)
else
FreeLibrary(Loaded[PluginLen].handle);
Result:= PluginLen - 1;
end;
function TGenericLoader.LoadPlugin(PluginName: string): Integer;
var
CpuBits: String = {$IFDEF CPU32}'32';{$ELSE}'64';{$ENDIF}
begin
try
Result := LoadPluginNoFallback(PluginName);
except
on exception do Result:= LoadPluginNoFallback(PluginName+CpuBits);
end;
end;
constructor TGenericLoader.Create;
begin
inherited Create;
PluginLen := 0;
PluginDirs := TStringList.Create;
PluginDirs.CaseSensitive:= {$IFDEF LINUX}true{$ELSE}false{$ENDIF};
PluginDirs.Duplicates:= dupIgnore;
end;
destructor TGenericLoader.Destroy;
begin
FreePlugins;
PluginDirs.Free;
inherited Destroy;
end;
end.