Initial commit

engines/ultima/nuvie/files/nuvie_io_file.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 "ultima/nuvie/core/nuvie_defs.h"
+#include "ultima/nuvie/files/nuvie_io_file.h"
+#include "engines/metaengine.h"
+#include "common/system.h"
+#include "common/config-manager.h"
+#include "engines/engine.h"
+
+namespace Ultima {
+namespace Nuvie {
+
+NuvieIOFileRead::~NuvieIOFileRead() {
+	close();
+}
+
+bool NuvieIOFileRead::open(const Common::Path &filename) {
+	if (isOpen())
+		// We already have a file open, lets bail.
+		return false;
+
+	// Handle any relative files under the game path, such as for FM-Towns sound. Though path
+	// delimiters can also be used for resources in ultima.dat
+
+        Common::StringArray components = filename.splitComponents();
+        if (components.empty()) {
+                return false;
+        }
+
+	if (components.size() >= 2) {
+		Common::FSNode node(ConfMan.getPath("path"));
+		for(const auto &c : components) {
+			node = node.getChild(c);
+			if (!node.exists())
+				break;
+		}
+		if (node.exists())
+			_srcFile.open(node);
+	}
+
+	if (!_srcFile.isOpen())
+		_srcFile.open(filename);
+
+	if (!_srcFile.isOpen()) {
+		DEBUG(0, LEVEL_ERROR, "Failed opening '%s'\n", filename.toString().c_str());
+		return false;
+	}
+
+	_file = &_srcFile;
+	size = _srcFile.size();
+	pos = 0;
+
+	return true;
+}
+
+bool NuvieIOFileRead::open(Common::InSaveFile *saveFile) {
+	assert(saveFile);
+	_file = saveFile;
+
+	size = _file->size();
+	pos = 0;
+
+	return true;
+}
+
+void NuvieIOFileRead::close() {
+	if (_srcFile.isOpen())
+		_srcFile.close();
+	_file = nullptr;
+
+	NuvieIO::close();
+}
+
+void NuvieIOFileRead::seek(uint32 new_pos) {
+	if (isOpen() && new_pos <= size) {
+		_file->seek(new_pos);
+		pos = new_pos;
+	}
+}
+
+uint8 NuvieIOFileRead::read1() {
+	if (pos > size - 1)
+		return 0;
+
+	pos++;
+
+	return _file->readByte();
+}
+
+uint16 NuvieIOFileRead::read2() {
+	if (pos > size - 2)
+		return 0;
+
+	pos += 2;
+	return _file->readUint16LE();
+}
+
+uint32 NuvieIOFileRead::read4() {
+	if (pos > size - 4)
+		return 0;
+
+	pos += 4;
+	return _file->readUint32LE();
+}
+
+bool NuvieIOFileRead::readToBuf(unsigned char *buf, uint32 buf_size) {
+	if (pos + buf_size > size)
+		return false;
+
+	_file->read(buf, buf_size);
+	pos += buf_size;
+	return true;
+}
+
+
+// NuvieIOFileWrite
+//
+
+NuvieIOFileWrite::NuvieIOFileWrite() : _saveFileData(DisposeAfterUse::YES),
+		_file(nullptr), _saveFile(nullptr), _isAutosave(false) {
+}
+
+NuvieIOFileWrite::~NuvieIOFileWrite() {
+	close();
+}
+
+bool NuvieIOFileWrite::open(const Common::Path &filename) {
+	if (isOpen())
+		// We already have an open file
+		return false;
+
+	// Ensure it's a relative path, that we can open for writing using a DumpFile
+	assert(!filename.getParent().empty());
+
+	if (!_dumpFile.open(filename, true)) {
+		DEBUG(0, LEVEL_ERROR, "Failed opening '%s'\n", filename.toString().c_str());
+		return false;
+	}
+
+	_file = &_dumpFile;
+	return true;
+}
+
+bool NuvieIOFileWrite::open(const Common::String &filename, bool isAutosave) {
+	if (isOpen())
+		// We already have an open file
+		return false;
+
+	// Singular file, so open it as a save file
+	_saveFile = g_system->getSavefileManager()->openForSaving(filename, false);
+	assert(_saveFile);
+
+	// Point _file to the _saveFileData member for initial writing,
+	// since save files don't allow seeking
+	_file = &_saveFileData;
+	_isAutosave = isAutosave;
+
+	size = 0;
+	pos = 0;
+
+	return true;
+}
+
+void NuvieIOFileWrite::close() {
+	if (!isOpen()) {
+		// Nothing needed
+	} else if (_saveFile) {
+		// Writing using savefile interface, so flush out data
+		_saveFile->write(_saveFileData.getData(), _saveFileData.size());
+		g_engine->getMetaEngine()->appendExtendedSave(_saveFile, g_engine->getTotalPlayTime(), _description, _isAutosave);
+
+		_saveFile->finalize();
+		delete _saveFile;
+		_saveFile = nullptr;
+	} else {
+		// Writing to a dump file, so simply close it
+		_dumpFile.close();
+	}
+
+	_file = nullptr;
+}
+
+void NuvieIOFileWrite::seek(uint32 new_pos) {
+	if (isOpen() && new_pos <= size) {
+		_file->seek(new_pos);
+		pos = new_pos;
+	}
+}
+
+bool NuvieIOFileWrite::write1(uint8 src) {
+	if (!isOpen())
+		return false;
+
+	_file->writeByte(src);
+	++pos;
+
+	if (pos > size)
+		size = pos;
+
+	return true;
+}
+
+bool NuvieIOFileWrite::write2(uint16 src) {
+	if (!isOpen())
+		return false;
+
+	_file->writeUint16LE(src);
+	pos += 2;
+
+	if (pos > size)
+		size = pos;
+
+	return true;
+}
+
+bool NuvieIOFileWrite::write4(uint32 src) {
+	if (!isOpen())
+		return false;
+
+	_file->writeUint32LE(src);
+	pos += 4;
+
+	if (pos > size)
+		size = pos;
+
+	return true;
+}
+
+uint32 NuvieIOFileWrite::writeBuf(const unsigned char *src, uint32 src_size) {
+	if (!isOpen())
+		return false;
+
+	pos += src_size;
+	if (pos > size)
+		size = pos;
+
+	return (_file->write(src, src_size));
+}
+
+uint32 NuvieIOFileWrite::write(NuvieIO *src) {
+	return 0;
+}
+
+} // End of namespace Nuvie
+} // End of namespace Ultima