Initial commit

engines/titanic/support/files_manager.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/file.h"
+#include "common/memstream.h"
+#include "common/compression/deflate.h"
+#include "titanic/support/files_manager.h"
+#include "titanic/game_manager.h"
+#include "titanic/titanic.h"
+
+namespace Titanic {
+
+CFilesManager::CFilesManager(TitanicEngine *vm) : _vm(vm), _gameManager(nullptr),
+		_assetsPath("Assets"), _drive(-1), _version(0) {
+}
+
+CFilesManager::~CFilesManager() {
+	_datFile.close();
+}
+
+bool CFilesManager::loadResourceIndex() {
+	if (!_datFile.open("titanic.dat")) {
+		GUIErrorMessage("Could not find titanic.dat data file");
+		return false;
+	}
+
+	uint headerId = _datFile.readUint32BE();
+	_version = _datFile.readUint16LE();
+	if (headerId != MKTAG('S', 'V', 'T', 'N')) {
+		GUIErrorMessage("titanic.dat has invalid contents");
+		return false;
+	}
+
+	if (_version != 5) {
+		GUIErrorMessage("titanic.dat is out of date");
+		return false;
+	}
+
+	// Read in entries
+	uint offset, size, flags;
+	char c;
+	Common::String resourceName;
+	for (;;) {
+		offset = _datFile.readUint32LE();
+		size = _datFile.readUint32LE();
+		flags = (_version == 1) ? 0 : _datFile.readUint16LE();
+
+		if (offset == 0 && size == 0)
+			break;
+
+		Common::String resName;
+		while ((c = _datFile.readByte()) != '\0')
+			resName += c;
+
+		_resources[resName] = ResourceEntry(offset, size, flags);
+	}
+
+	return true;
+}
+
+bool CFilesManager::fileExists(const CString &name) {
+	return Common::File::exists(Common::Path(name));
+}
+
+bool CFilesManager::scanForFile(const CString &name) {
+	if (name.empty())
+		return false;
+
+	CString filename = name;
+	filename.toLowercase();
+
+	if (filename[0] == 'y' || filename[0] == 'z')
+		return true;
+	else if (filename[0] < 'a' || filename[0] > 'c')
+		return false;
+
+	CString fname = filename;
+	int idx = fname.indexOf('#');
+	if (idx >= 0) {
+		fname = fname.left(idx);
+		fname += ".st";
+	}
+
+	// Return true if the file exists
+	if (fileExists(fname))
+		return true;
+
+	// Couldn't find file. Start by calling the game manager's roomChange
+	// method, which handles all active scene objects freeing their resources
+	if (_gameManager)
+		_gameManager->roomChange();
+
+	return false;
+}
+
+void CFilesManager::loadDrive() {
+	assert(_drive == -1);
+	resetView();
+}
+
+void CFilesManager::insertCD(CScreenManager *screenManager) {
+	// We don't support running the game directly from the original CDs,
+	// so this method can remain stubbed
+}
+
+void CFilesManager::resetView() {
+	if (_gameManager) {
+		_gameManager->_gameState.setMode(GSMODE_INTERACTIVE);
+		_gameManager->markAllDirty();
+	}
+}
+
+void CFilesManager::preload(const CString &name) {
+	// We don't currently do any preloading of resources
+}
+
+Common::SeekableReadStream *CFilesManager::getResource(const CString &str) {
+	ResourceEntry resEntry = _resources[str];
+
+	// If we're running the German version, check for the existence of
+	// a German specific version of the given resource
+	if (_vm->isGerman() && _resources.contains(str + "/DE"))
+		resEntry = _resources[str + "/DE"];
+
+	_datFile.seek(resEntry._offset);
+
+	Common::SeekableReadStream *stream = (resEntry._size > 0) ?
+		_datFile.readStream(resEntry._size) :
+		new Common::MemoryReadStream(nullptr, 0);
+	if (resEntry._flags & FLAG_COMPRESSED)
+		stream = Common::wrapCompressedReadStream(stream);
+
+	return stream;
+}
+
+} // End of namespace Titanic