Initial commit

backends/platform/dc/dc-fs.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/>.
+ *
+ */
+
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "dc.h"
+#include "backends/fs/abstract-fs.h"
+#include "backends/fs/stdiostream.h"
+
+#include <ronin/cdfs.h>
+#include <stdio.h>
+#define usleep usleep_unistd
+#include <unistd.h>
+#undef usleep
+
+/**
+ * Implementation of the ScummVM file system API based on Ronin.
+ *
+ * Parts of this class are documented in the base interface class, AbstractFSNode.
+ */
+class RoninCDFileNode : public AbstractFSNode {
+protected:
+	Common::String _path;
+
+public:
+	RoninCDFileNode(const Common::String &path) : _path(path) {}
+
+	bool exists() const override { return true; }
+	Common::String getName() const override { return lastPathComponent(_path, '/'); }
+	Common::U32String getDisplayName() const override { return getName(); }
+	Common::String getPath() const override { return _path; }
+	bool isDirectory() const override { return false; }
+	bool isReadable() const override { return true; }
+	bool isWritable() const override { return false; }
+
+	AbstractFSNode *getChild(const Common::String &n) const override { return NULL; }
+	bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const override { return false; }
+	AbstractFSNode *getParent() const override;
+
+	Common::SeekableReadStream *createReadStream() override;
+	Common::SeekableWriteStream *createWriteStream(bool atomic) override { return 0; }
+	bool createDirectory() override { return false; }
+
+	static AbstractFSNode *makeFileNodePath(const Common::String &path);
+};
+
+/* A directory */
+class RoninCDDirectoryNode final : public RoninCDFileNode {
+public:
+	RoninCDDirectoryNode(const Common::String &path) : RoninCDFileNode(path) {}
+
+	bool isDirectory() const override { return true; }
+	AbstractFSNode *getChild(const Common::String &n) const override;
+	bool getChildren(AbstractFSList &list, ListMode mode, bool hidden) const override;
+	Common::SeekableReadStream *createReadStream() override { return 0; }
+	bool createDirectory() override { return true; }
+};
+
+/* A file/directory which does not exist */
+class RoninCDNonexistingNode final : public RoninCDFileNode {
+public:
+	RoninCDNonexistingNode(const Common::String &path) : RoninCDFileNode(path) {}
+
+	bool exists() const override { return false; }
+	bool isReadable() const override { return false; }
+	Common::SeekableReadStream *createReadStream() override { return 0; }
+};
+
+AbstractFSNode *RoninCDFileNode::makeFileNodePath(const Common::String &path) {
+	assert(path.size() > 0);
+
+	int fd;
+
+	if ((fd = open(path.c_str(), O_RDONLY)) >= 0) {
+		close(fd);
+		return new RoninCDFileNode(path);
+	} else if ((fd = open(path.c_str(), O_DIR|O_RDONLY)) >= 0) {
+		close(fd);
+		return new RoninCDDirectoryNode(path);
+	} else {
+		return NULL;
+	}
+}
+
+AbstractFSNode *RoninCDDirectoryNode::getChild(const Common::String &n) const {
+	Common::String newPath(_path);
+	if (_path.lastChar() != '/')
+		newPath += '/';
+	newPath += n;
+
+	return makeFileNodePath(newPath);
+}
+
+bool RoninCDDirectoryNode::getChildren(AbstractFSList &myList, ListMode mode, bool hidden) const {
+
+	DIR *dirp = opendir(_path.c_str());
+	struct dirent *dp;
+
+	if (dirp == NULL)
+		return false;
+
+	// ... loop over dir entries using readdir
+	while ((dp = readdir(dirp)) != NULL) {
+		Common::String newPath(_path);
+		if (newPath.lastChar() != '/')
+			newPath += '/';
+		newPath += dp->d_name;
+
+		if (dp->d_size < 0) {
+			// Honor the chosen mode
+			if (mode == Common::FSNode::kListFilesOnly)
+				continue;
+
+			myList.push_back(new RoninCDDirectoryNode(newPath));
+		} else {
+			// Honor the chosen mode
+			if (mode == Common::FSNode::kListDirectoriesOnly)
+				continue;
+
+			myList.push_back(new RoninCDFileNode(newPath));
+		}
+	}
+	closedir(dirp);
+
+	return true;
+}
+
+AbstractFSNode *RoninCDFileNode::getParent() const {
+	if (_path == "/")
+		return 0;
+
+	const char *start = _path.c_str();
+	const char *end = lastPathComponent(_path, '/');
+
+	return new RoninCDDirectoryNode(Common::String(start, end - start));
+}
+
+
+Common::SeekableReadStream *RoninCDFileNode::createReadStream() {
+	return StdioStream::makeFromPath(getPath().c_str(), StdioStream::WriteMode_Read);
+}
+
+AbstractFSNode *OSystem_Dreamcast::makeRootFileNode() const {
+	return new RoninCDDirectoryNode("/");
+}
+
+AbstractFSNode *OSystem_Dreamcast::makeCurrentDirectoryFileNode() const {
+	return makeRootFileNode();
+}
+
+AbstractFSNode *OSystem_Dreamcast::makeFileNodePath(const Common::String &path) const {
+	AbstractFSNode *node = RoninCDFileNode::makeFileNodePath(path);
+	return (node ? node : new RoninCDNonexistingNode(path));
+}