Separated the Dreamcast filesystem backend from the POSIX one.

svn-id: r22883

1 files changed, 180 insertions, 0 deletions

diff --git a/backends/fs/dc/dc-fs.cpp b/backends/fs/dc/dc-fs.cpp
new file mode 100644
index 0000000000..7a3289e971
--- /dev/null
+++ b/backends/fs/dc/dc-fs.cpp
@@ -0,0 +1,180 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2002-2006 The ScummVM project
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ */
+
+#if defined(__DC__)
+
+#include "common/stdafx.h"
+
+#include "backends/fs/abstract-fs.h"
+#include "backends/fs/fs.h"
+
+#include <ronin/cdfs.h>
+#include <stdio.h>
+#include <unistd.h>
+
+/*
+ * Implementation of the ScummVM file system API based on ronin.
+ */
+
+class RoninCDFilesystemNode : public AbstractFilesystemNode {
+protected:
+	String _displayName;
+	bool _isDirectory;
+	bool _isValid;
+	String _path;
+
+public:
+	RoninCDFilesystemNode();
+	RoninCDFilesystemNode(const String &path, bool verify);
+
+	virtual String displayName() const { return _displayName; }
+	virtual bool isValid() const { return _isValid; }
+	virtual bool isDirectory() const { return _isDirectory; }
+	virtual String path() const { return _path; }
+
+	virtual bool listDir(AbstractFSList &list, ListMode mode) const;
+	virtual AbstractFilesystemNode *parent() const;
+	virtual AbstractFilesystemNode *child(const String &name) const;
+};
+
+
+static const char *lastPathComponent(const Common::String &str) {
+	const char *start = str.c_str();
+	const char *cur = start + str.size() - 2;
+
+	while (cur > start && *cur != '/') {
+		--cur;
+	}
+
+	return cur + 1;
+}
+
+AbstractFilesystemNode *AbstractFilesystemNode::getCurrentDirectory() {
+	// Since there is no way to _set_ the current directory,
+	// it will always be /...
+
+	return getRoot();
+}
+
+AbstractFilesystemNode *AbstractFilesystemNode::getRoot() {
+	return new RoninCDFilesystemNode();
+}
+
+AbstractFilesystemNode *AbstractFilesystemNode::getNodeForPath(const String &path) {
+	return new RoninCDFilesystemNode(path, true);
+}
+
+RoninCDFilesystemNode::RoninCDFilesystemNode() {
+	// The root dir.
+	_path = "/";
+	_displayName = _path;
+	_isValid = true;
+	_isDirectory = true;
+}
+
+RoninCDFilesystemNode::RoninCDFilesystemNode(const String &p, bool verify) {
+	assert(p.size() > 0);
+
+	_path = p;
+	_displayName = lastPathComponent(_path);
+	_isValid = true;
+	_isDirectory = true;
+
+	if (verify) {
+		int fd;
+
+		if((fd = open(_path.c_str(), O_RDONLY)) >= 0) {
+			close(fd);
+			_isDirectory = false;
+		}
+		else if((fd = open(_path.c_str(), O_DIR|O_RDONLY)) >= 0) {
+			close(fd);
+		}
+		else {
+			_isValid = false;
+		}
+	}
+}
+
+bool RoninCDFilesystemNode::listDir(AbstractFSList &myList, ListMode mode) const {
+	assert(_isDirectory);
+	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) {
+		String newPath(_path);
+		if (newPath.lastChar() != '/')
+			newPath += '/';
+		newPath += dp->d_name;
+
+		RoninCDFilesystemNode entry(newPath, false);
+
+		entry._isDirectory = dp->d_size < 0;
+
+		// Skip files that are invalid for some reason (e.g. because we couldn't
+		// properly stat them).
+		if (!entry._isValid)
+			continue;
+
+		// Honor the chosen mode
+		if ((mode == FilesystemNode::kListFilesOnly && entry._isDirectory) ||
+			(mode == FilesystemNode::kListDirectoriesOnly && !entry._isDirectory))
+			continue;
+
+		if (entry._isDirectory)
+			entry._path += "/";
+		myList.push_back(new RoninCDFilesystemNode(entry));
+	}
+	closedir(dirp);
+	return true;
+}
+
+AbstractFilesystemNode *RoninCDFilesystemNode::parent() const {
+	if (_path == "/")
+		return 0;
+
+	const char *start = _path.c_str();
+	const char *end = lastPathComponent(_path);
+
+	RoninCDFilesystemNode *p = new RoninCDFilesystemNode(String(start, end - start), false);
+
+	return p;
+}
+
+AbstractFilesystemNode *RoninCDFilesystemNode::child(const String &name) const {
+	// FIXME: Pretty lame implementation! We do no error checking to speak
+	// of, do not check if this is a special node, etc.
+	assert(_isDirectory);
+	String newPath(_path);
+	if (_path.lastChar() != '/')
+		newPath += '/';
+	newPath += name;
+	RoninCDFilesystemNode *p = new RoninCDFilesystemNode(newPath, true);
+
+	return p;
+}
+
+#endif // defined(__DC__)