MYST3: Properly read the directory of multiple room archives

engines/myst3/archive.cpp

@@ -51,12 +51,15 @@ void Archive::_readDirectory() {
 	Common::MemoryReadStream directory(buf.getData(), buf.size());
 	directory.skip(sizeof(uint32));
 	
-	while (directory.pos() < directory.size()) {
+	while (directory.pos() + 4 < directory.size()) {
 		DirectoryEntry entry(this);
-		entry.readFromStream(directory);
-		if (entry.hasSubEntries()) {
-			_directory.push_back(entry);
-		}
+		
+		if (_multipleRoom)
+			entry.readFromStream(directory, 0);
+		else
+			entry.readFromStream(directory, _roomName);
+		
+		_directory.push_back(entry);
 	}
 }
 
@@ -87,7 +90,14 @@ const DirectorySubEntry *Archive::getDescription(uint16 index, uint16 face, Dire
 	return 0;
 }
 
-bool Archive::open(const char *fileName) {
+bool Archive::open(const char *fileName, const char *room) {
+	// Copy the room name if provided
+	// If the room name is not provided, it is assumed that
+	// we are opening a multi-room archive
+	_multipleRoom = room == 0;
+	if (!_multipleRoom)
+		Common::strlcpy(_roomName, room, sizeof(_roomName));
+
 	if (_file.open(fileName)) {
 		_readDirectory();
 		return true;

engines/myst3/archive.h

@@ -32,6 +32,8 @@ namespace Myst3 {
 
 class Archive {
 	private:
+		bool _multipleRoom;
+		char _roomName[5];
 		Common::File _file;
 		Common::Array<DirectoryEntry> _directory;
 		
@@ -44,7 +46,7 @@ class Archive {
 		void dumpDirectory();
 		void dumpToFiles();
 		
-		bool open(const char *fileName);
+		bool open(const char *fileName, const char *room);
 		void close();
 };
 

engines/myst3/directoryentry.cpp

@@ -27,9 +27,15 @@ namespace Myst3 {
 
 DirectoryEntry::DirectoryEntry(Archive *archive) :
 	_archive(archive) {
+	memset(_roomName, 0, sizeof(_roomName));
 }
 
-void DirectoryEntry::readFromStream(Common::SeekableReadStream &inStream) {
+void DirectoryEntry::readFromStream(Common::SeekableReadStream &inStream, const char *room) {
+	if (room == 0)
+		inStream.read(_roomName, 4);
+	else
+		Common::strlcpy(_roomName, room, sizeof(_roomName));
+
 	_index = inStream.readUint16LE();
 	_unk = inStream.readByte();
 	byte subItemCount = inStream.readByte();
@@ -55,10 +61,6 @@ void DirectoryEntry::dump() {
 	}
 }
 
-bool DirectoryEntry::hasSubEntries() {
-	return !_subentries.empty();
-}
-
 void DirectoryEntry::dumpToFiles(Common::SeekableReadStream &inStream) {
 	for (uint i = 0; i < _subentries.size(); i++) {
 		_subentries[i].dumpToFile(inStream, _index);

engines/myst3/directoryentry.h

@@ -31,6 +31,7 @@ namespace Myst3 {
 
 class DirectoryEntry {
 	private:
+		char _roomName[5];
 		uint16 _index;
 		uint8 _unk;
 		Common::Array<DirectorySubEntry> _subentries;
@@ -41,11 +42,10 @@ class DirectoryEntry {
 		DirectoryEntry() {}
 		DirectoryEntry(Archive *archive);
 
-		void readFromStream(Common::SeekableReadStream &inStream);
+		void readFromStream(Common::SeekableReadStream &inStream, const char *room);
 		void dump();
 		void dumpToFiles(Common::SeekableReadStream &inStream);
 		DirectorySubEntry *getItemDescription(uint16 face, DirectorySubEntry::ResourceType type);
-		bool hasSubEntries();
 		uint16 getIndex() { return _index; }
 };
 

engines/myst3/myst3.cpp

@@ -107,15 +107,15 @@ Common::Error Myst3Engine::run() {
 	_system->setupScreen(w, h, false, true);
 	_system->showMouse(false);
 
-	if (!_archiveLANG->open("ENGLISH.m3t")) {
+	if (!_archiveLANG->open("ENGLISH.m3t", 0)) {
 		error("Unable to open archive ENGLISH.m3t");
 	}
 
-	if (!_archiveRSRC->open("RSRC.m3r")) {
+	if (!_archiveRSRC->open("RSRC.m3r", 0)) {
 		error("Unable to open archive RSRC.m3r");
 	}
 
-	if (!_archiveOVER->open("OVER101.m3o")) {
+	if (!_archiveOVER->open("OVER101.m3o", 0)) {
 		// OVER101 is not required
 		delete _archiveOVER;
 		_archiveOVER = 0;
@@ -331,7 +331,7 @@ void Myst3Engine::loadNode(uint16 nodeID, uint32 roomID, uint32 ageID) {
 		Common::String nodeFile = Common::String::format("%snodes.m3a", newRoomName);
 
 		_archive->close();
-		if (!_archive->open(nodeFile.c_str())) {
+		if (!_archive->open(nodeFile.c_str(), newRoomName)) {
 			error("Unable to open archive %s", nodeFile.c_str());
 		}
 	}