LAB: Simplify file handling code

4 files changed, 22 insertions, 46 deletions

diff --git a/engines/lab/labsets.cpp b/engines/lab/labsets.cpp
index 21c495d246..259858763e 100644
--- a/engines/lab/labsets.cpp
+++ b/engines/lab/labsets.cpp
@@ -58,19 +58,15 @@ void LargeSet::exclElement(uint16 element) {
 }
 
 bool LargeSet::readInitialConditions(const char *fileName) {
-	Common::File *file;
+	Common::File *file = _vm->_resource->openDataFile(fileName, MKTAG('C', 'O', 'N', '0'));
 
-	if ((file = _vm->_resource->openDataFile(fileName, MKTAG('C', 'O', 'N', '0')))) {
-		uint16 conditions = file->readUint16LE();
-		for (int i = 0; i < conditions; i++) {
-			inclElement(file->readUint16LE());
-		}
-
-		delete file;
-		return true;
+	uint16 conditions = file->readUint16LE();
+	for (int i = 0; i < conditions; i++) {
+		inclElement(file->readUint16LE());
 	}
 
-	return false;
+	delete file;
+	return true;
 }
 
 
diff --git a/engines/lab/map.cpp b/engines/lab/map.cpp
index f5746baa42..36591d759b 100644
--- a/engines/lab/map.cpp
+++ b/engines/lab/map.cpp
@@ -171,8 +171,6 @@ static bool loadMapData() {
 	}
 
 	Common::File *mapFile = g_lab->_resource->openDataFile("Lab:Maps", MKTAG('M', 'A', 'P', '0'));
-	if (!mapFile)
-		error("Corrupt map file");
 	g_lab->_music->updateMusic();
 	if (!g_lab->_music->_doNotFilestopSoundEffect)
 		g_lab->_music->stopSoundEffect();
diff --git a/engines/lab/music.cpp b/engines/lab/music.cpp
index b6b00cb23c..0f42064a5c 100644
--- a/engines/lab/music.cpp
+++ b/engines/lab/music.cpp
@@ -176,14 +176,8 @@ bool Music::initMusic() {
 		filename = "Music:BackGrou";
 
 	_file = g_lab->_resource->openDataFile(filename);
-
-	if (_file) {
-		startMusic(true);
-		return true;
-	}
-
-	_musicOn = false;
-	return false;
+	startMusic(true);
+	return true;
 }
 
 /*****************************************************************************/
@@ -278,16 +272,10 @@ void Music::changeMusic(const char *newmusic) {
 	}
 
 	_file = g_lab->_resource->openDataFile(newmusic);
-
-	if (_file) {
-		_musicOn = true;   /* turn it off */
-		setMusic(false);
-		_musicOn = false;  /* turn it back on */
-		setMusic(true);
-	} else {
-		_file  = _tFile;
-		_tFile = 0;
-	}
+	_musicOn = true;   /* turn it off */
+	setMusic(false);
+	_musicOn = false;  /* turn it back on */
+	setMusic(true);
 }
 
 /*****************************************************************************/
diff --git a/engines/lab/resource.cpp b/engines/lab/resource.cpp
index 5b4c0c101e..aaac1cd261 100644
--- a/engines/lab/resource.cpp
+++ b/engines/lab/resource.cpp
@@ -34,7 +34,6 @@
 
 namespace Lab {
 
-static uint16 allocroom;
 extern RoomData *_rooms;
 extern uint16 NumInv, ManyRooms, HighestCondition;
 
@@ -91,9 +90,7 @@ char *Resource::getText(const char *fileName) {
 }
 
 bool Resource::readRoomData(const char *fileName) {
-	Common::File *dataFile;
-	if (!(dataFile = openDataFile(fileName, MKTAG('D', 'O', 'R', '1'))))
-		return false;
+	Common::File *dataFile = openDataFile(fileName, MKTAG('D', 'O', 'R', '1'));
 
 	ManyRooms = dataFile->readUint16LE();
 	HighestCondition = dataFile->readUint16LE();
@@ -120,9 +117,7 @@ bool Resource::readRoomData(const char *fileName) {
 }
 
 InventoryData *Resource::readInventory(const char *fileName) {
-	Common::File *dataFile;
-	if (!(dataFile = openDataFile(fileName, MKTAG('I', 'N', 'V', '1'))))
-		return nullptr;
+	Common::File *dataFile = openDataFile(fileName, MKTAG('I', 'N', 'V', '1'));
 
 	NumInv = dataFile->readUint16LE();
 	InventoryData *inventory = (InventoryData *)malloc((NumInv + 1) * sizeof(InventoryData));
@@ -140,11 +135,7 @@ InventoryData *Resource::readInventory(const char *fileName) {
 
 bool Resource::readViews(uint16 roomNum) {
 	Common::String fileName = "LAB:Rooms/" + Common::String::format("%d", roomNum);
-	Common::File *dataFile;
-	if (!(dataFile = openDataFile(fileName.c_str(), MKTAG('R', 'O', 'M', '4'))))
-		return false;
-
-	allocroom = roomNum;
+	Common::File *dataFile = openDataFile(fileName.c_str(), MKTAG('R', 'O', 'M', '4'));
 
 	_rooms[roomNum]._roomMsg = readString(dataFile);
 	_rooms[roomNum]._view[NORTH] = readView(dataFile);
@@ -191,11 +182,14 @@ Common::File *Resource::openDataFile(const char *fileName, uint32 fileHeader) {
 	Common::File *dataFile = new Common::File();
 	dataFile->open(translateFileName(fileName));
 	if (!dataFile->isOpen())
-		error("openDataFile couldn't open %s (%s)", translateFileName(fileName), fileName);
+		error("openDataFile: Couldn't open %s (%s)", translateFileName(fileName), fileName);
 
-	if (fileHeader > 0 && dataFile->readUint32BE() != fileHeader) {
-		dataFile->close();
-		return nullptr;
+	if (fileHeader > 0) {
+		uint32 headerTag = dataFile->readUint32BE();
+		if (headerTag != fileHeader) {
+			dataFile->close();
+			error("openDataFile: Unexpected header in %s (%s) - expected: %d, got: %d", translateFileName(fileName), fileName, fileHeader, headerTag);
+		}
 	}
 
 	return dataFile;