- fixed: We must not allow the engine to start without a default MAPINFO definition.

Both 'Adventures of Square' IWADs were missing an entry for base MAPINFO and as a result did not define the common editor numbers.
To prevent this, a new mindefaults MAPINFO was added to zdoom.pk3 which now gets loaded if IWADINFO does not specify a game-specific file.
This minimum setting sets all gamedefaults to a reasonable base value and defines all other things that are required to be defined.

src/d_iwad.cpp

@@ -219,6 +219,11 @@ void FIWadManager::ParseIWadInfo(const char *fn, const char *data, int datasize)
 					sc.ScriptError("Unknown keyword '%s'", sc.String);
 				}
 			}
+			if (iwad->MapInfo.IsEmpty())
+			{
+				// We must at least load the minimum defaults to allow the engine to run.
+				iwad->MapInfo = "mapinfo/mindefaults.txt";
+			}
 		}
 		else if (sc.Compare("NAMES"))
 		{

wadsrc/static/iwadinfo.txt

@@ -6,6 +6,7 @@ IWad
 	Autoname = "square.square"
 	Game = "Doom"
 	Config = "Square"
+	Mapinfo = "mapinfo/mindefaults.txt"
 	MustContain = "SQU-IWAD", "E1A1"
 	BannerColors = "ff ff ff", "80 00 80"
 }
@@ -16,6 +17,7 @@ IWad
 	Autoname = "square.squareware"
 	Game = "Doom"
 	Config = "Square"
+	Mapinfo = "mapinfo/mindefaults.txt"
 	MustContain = "SQU-SWE1", "E1A1"
 	BannerColors = "ff ff ff", "80 00 80"
 }

wadsrc/static/mapinfo/mindefaults.txt

@@ -0,0 +1,59 @@
+// defines the minimum needed entries to let an unknown IWAD run
+
+gameinfo
+{
+	titlepage = "-NOFLAT-"
+	titletime = 999
+	infopage = "-NOFLAT-"
+	titlemusic = ""
+	advisorytime = 0
+	chatsound = ""
+	finalemusic = ""
+	finaleflat = "-NOFLAT-"
+	finalepage = "-NOFLAT-"
+	quitsound = ""
+	borderflat = "-NOFLAT-"
+	border = DoomBorder
+	telefogheight = 0
+	defkickback = 100
+	skyflatname = "F_SKY1"
+	translator = "xlat/doom.txt"
+	defaultbloodcolor = "68 00 00"
+	defaultbloodparticlecolor = "ff 00 00"
+	backpacktype = "Backpack"
+	armoricons = "AICNA0", 0.75, "AICNC0"
+	statusbar = "sbarinfo/doom.txt"
+	intermissionmusic = ""
+	intermissioncounter = true
+	dimcolor = "6f 00 6b"
+	dimamount = 0.8
+	definventorymaxamount = 25
+	defaultrespawntime = 12
+	defaultdropstyle = 1
+	endoom = "ENDOOM"
+	player5start = 4001
+	pickupcolor = "c0 c0 c0"
+	quitmessages = "Do you want to quit?"
+
+	menufontcolor_title = "purple"
+	menufontcolor_label = "default"
+	menufontcolor_value = "gray"
+	menufontcolor_action = "gray"
+	menufontcolor_header = "blue"
+	menufontcolor_highlight = "lightblue"
+	menufontcolor_selection = "purple"
+	menubackbutton = "M_BACK_D"
+	playerclasses = "DoomPlayer"
+	pausesign = "-NOFLAT-"
+	gibfactor = 1
+	cursorpic = "doomcurs"
+	textscreenx = 10
+	textscreeny = 10
+	defaultendsequence = "Inter_Cast"
+	maparrow = "maparrows/arrow.txt", "maparrows/ddtarrow.txt"
+	statscreen_mapnamefont = "BigFont"
+	statscreen_finishedpatch = "WIF"
+	statscreen_enteringpatch = "WIENTER"
+}
+
+include "mapinfo/common.txt"