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engines/ultima/ultima8/filesys/u8_save_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 "common/memstream.h"
+#include "ultima/ultima8/misc/debugger.h"
+
+#include "ultima/ultima8/filesys/u8_save_file.h"
+
+namespace Ultima {
+namespace Ultima8 {
+
+U8SaveFile::U8SaveFile(Common::SeekableReadStream *rs) : _rs(rs) {
+	_valid = isU8SaveFile(_rs);
+
+	if (_valid)
+		_valid = readMetadata();
+}
+
+U8SaveFile::~U8SaveFile() {
+	delete _rs;
+}
+
+//static
+bool U8SaveFile::isU8SaveFile(Common::SeekableReadStream *rs) {
+	rs->seek(0);
+	char buf[24];
+	rs->read(buf, 23);
+	buf[23] = '\0';
+
+	return (strncmp(buf, "Ultima 8 SaveGame File.", 23) == 0);
+}
+
+bool U8SaveFile::readMetadata() {
+	_rs->seek(0x18);
+	uint16 count = _rs->readUint16LE();
+
+	for (unsigned int i = 0; i < count; ++i) {
+		uint32 namelen = _rs->readUint32LE();
+		char *name = new char[namelen];
+		_rs->read(name, namelen);
+
+		FileEntry fe;
+		fe._size = _rs->readUint32LE();
+		fe._offset = _rs->pos();
+
+		_map[Common::String(name)] = fe;
+		delete[] name;
+		_rs->skip(fe._size); // skip data
+	}
+
+	return true;
+}
+
+bool U8SaveFile::hasFile(const Common::Path &path) const {
+	return _map.contains(path.toString());
+}
+
+int U8SaveFile::listMembers(Common::ArchiveMemberList& list) const {
+	list.clear();
+	for (const auto &member : _map) {
+		list.push_back(Common::ArchiveMemberPtr(new Common::GenericArchiveMember(member._key, *this)));
+	}
+
+	return list.size();
+}
+
+const Common::ArchiveMemberPtr U8SaveFile::getMember(const Common::Path& path) const {
+	if (!hasFile(path))
+		return nullptr;
+
+	Common::String name = path.toString();
+	return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(name, *this));
+}
+
+Common::SeekableReadStream* U8SaveFile::createReadStreamForMember(const Common::Path& path) const {
+	if (!hasFile(path))
+		return nullptr;
+
+	const FileEntry &fe = _map[path.toString()];
+	uint8 *data = (uint8 *)malloc(fe._size);
+	_rs->seek(fe._offset);
+	_rs->read(data, fe._size);
+
+	return new Common::MemoryReadStream(data, fe._size, DisposeAfterUse::YES);
+}
+
+} // End of namespace Ultima8
+} // End of namespace Ultima