engine: correctly validate blueshift maps

engine/common/mod_bmodel.c

@@ -1977,7 +1977,7 @@ static void Mod_LoadTextures( dbspmodel_t *bmod )
 			int	size = (int)sizeof( mip_t ) + ((mt->width * mt->height * 85)>>6);
 			int	next_dataofs, remaining;
 
-			// compute next dataofset to determine allocated miptex sapce
+			// compute next dataofset to determine allocated miptex space
 			for( j = i + 1; j < loadmodel->numtextures; j++ )
 			{
 				next_dataofs = in->dataofs[j];
@@ -2893,6 +2893,15 @@ qboolean Mod_TestBmodelLumps( const char *name, const byte *mod_base, qboolean s
 		break;
 	}
 
+	if( header->version == HLBSP_VERSION &&
+		header->lumps[LUMP_ENTITIES].fileofs <= 1024 &&
+		(header->lumps[LUMP_ENTITIES].filelen % sizeof( dplane_t )) == 0 )
+	{
+		// blue-shift swapped lumps
+		srclumps[0].lumpnumber = LUMP_PLANES;
+		srclumps[1].lumpnumber = LUMP_ENTITIES;
+	}
+
 	// loading base lumps
 	for( i = 0; i < ARRAYSIZE( srclumps ); i++ )
 		Mod_LoadLump( mod_base, &srclumps[i], &worldstats[i], flags );