docview: refactored text encoding version

docview now uses a single fpGUI call to do encoding conversions. This
make is much easier to maintaing - a single method needs to be
modified if new encoding conversions get added.

3 files changed, 13 insertions, 37 deletions

diff --git a/docview/src/HelpFile.pas b/docview/src/HelpFile.pas
index ce3d9f8a..c013412c 100644
--- a/docview/src/HelpFile.pas
+++ b/docview/src/HelpFile.pas
@@ -9,6 +9,7 @@ interface
 uses
   Classes
   ,SysUtils
+  ,fpg_base
   ,fpg_imagelist
   ,IPFFileFormatUnit
   ,HelpTopic
@@ -18,9 +19,6 @@ uses
 
 type
 
-  TFontEncoding = (encUTF8, encCP437, encCP850, encIBMGraph);
-
-
   TIndexEntry = class(TObject)
   private
     name: String;
@@ -173,7 +171,7 @@ type
     procedure SetupFontSubstitutes( Substitutions: string );
   public
     NotesLoaded: boolean; // used externally
-    Encoding: TFontEncoding;
+    Encoding: TfpgTextEncoding;
   end;
 
 // Returns helpfile that the given topic is within
@@ -396,14 +394,7 @@ begin
     begin
       lText := TTopic(TopicList[i]).Title;
       // apply encoding conversion
-      case Encoding of
-        encUTF8:      lText := IPFToUTF8(lText);
-        encCP437:     lText := CP437ToUTF8(lText);
-        encCP850:     lText := CP850ToUTF8(lText);
-        encIBMGraph:  lText := IBMGraphToUTF8(lText);
-      else
-        lText := IPFToUTF8(lText);
-      end;
+      lText := ConvertTextToUTF8(Encoding, lText);
       TTopic(TopicList[i]).Title := lText;
     end;
   except
@@ -663,7 +654,6 @@ var
   pEnd: pByte;
   pIndexData: pointer;
   tmpIndexEntry: TIndexEntry;
-  lText: string;
 begin
   LogEvent(LogParse, 'Read index');
   _Index := TIndex.Create;
@@ -694,15 +684,7 @@ begin
     if pEntryHeader^.TOCIndex < _Topics.Count then
     begin
       // apply encoding conversion
-      case Encoding of
-        encUTF8:      lText := IPFToUTF8(EntryText);
-        encCP437:     lText := CP437ToUTF8(EntryText);
-        encCP850:     lText := CP850ToUTF8(EntryText);
-        encIBMGraph:  lText := IBMGraphToUTF8(EntryText);
-      else
-        lText := IPFToUTF8(EntryText);
-      end;
-      EntryText := lText;
+      EntryText := ConvertTextToUTF8(Encoding, EntryText);
       tmpIndexEntry := TIndexEntry.Create(EntryText, TTopic(_Topics[pEntryHeader^.TOCIndex]), pEntryHeader^.flags);
       _Index.Add(tmpIndexEntry);
     end
@@ -1067,10 +1049,11 @@ begin
   begin
     pFontSpec := p + i * sizeof( THelpFontSpec );
     _FontTable.Add( pFontSpec );
-    if pFontSpec^.CodePage = 850 then
-      Encoding := encCP850
-    else if pFontSpec^.CodePage = 437 then
-      Encoding := encCP437;
+    case pFontSpec^.CodePage of
+      437:  Encoding := encCP437;
+      850:  Encoding := encCP850;
+      866:  Encoding := encCP866;
+    end;
   end;
 end;
 
diff --git a/docview/src/SettingsUnit.pas b/docview/src/SettingsUnit.pas
index 43083709..0825b10b 100644
--- a/docview/src/SettingsUnit.pas
+++ b/docview/src/SettingsUnit.pas
@@ -13,7 +13,6 @@ Uses
   ,fpg_base
   ,fpg_main
   ,CanvasFontManager
-  ,HelpFile
   ;
 
 Const
@@ -95,7 +94,7 @@ type
     GlobalSearchLocation: TGlobalSearchLocation;
     SearchDirectories: TStringList;
     IPFTopicSaveAsEscaped: boolean;
-    Encoding: TFontEncoding;
+    Encoding: TfpgTextEncoding;
   end;
 
 
diff --git a/docview/src/frm_main.pas b/docview/src/frm_main.pas
index 97a9fd04..17507f51 100644
--- a/docview/src/frm_main.pas
+++ b/docview/src/frm_main.pas
@@ -1174,7 +1174,7 @@ end;
 
 procedure TMainForm.cbEncodingChanged(Sender: TObject);
 begin
-  Settings.Encoding := TFontEncoding(cbEncoding.FocusItem);
+  Settings.Encoding := TfpgTextEncoding(cbEncoding.FocusItem);
   DisplayTopic(CurrentTopic);
 end;
 
@@ -2569,14 +2569,7 @@ begin
   ImageIndices.Free;
 
   // apply encoding conversion
-  case Settings.Encoding of
-    encUTF8:      lText := IPFToUTF8(lText);
-    encCP437:     lText := CP437ToUTF8(lText);
-    encCP850:     lText := CP850ToUTF8(lText);
-    encIBMGraph:  lText := IBMGraphToUTF8(lText);
-  else
-    lText := IPFToUTF8(lText);
-  end;
+  lText := ConvertTextToUTF8(HelpFile.Encoding, lText);
 
   { Load and insert annotations / notes }
   if not HelpFile.NotesLoaded then
@@ -3467,6 +3460,7 @@ begin
     Items.Add('UTF-8');
     Items.Add('CP437');
     Items.Add('CP850');
+    Items.Add('CP866');
     Items.Add('IBM Graph (cp437)');
     FocusItem := 0;
     TabOrder := 10;