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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*/
#ifndef FS_H
#define FS_H
/*
* The API described in this header is meant to allow for file system browsing in a
* portable fashions. To this ends, multiple or single roots have to be supported
* (compare Unix with a single root, Windows with multiple roots C:, D:, ...).
*
* To this end, we abstract away from paths; implementations can be based on
* paths (and it's left to them whether / or \ or : is the path separator :-);
* but it is also possible to use inodes or vrefs (MacOS 9) or anything else.
*
* NOTE 1: currently ONLY the directory listing mode is used; that is, we only are
* interested in listing directories. Thus, for now implementation only have to
* list directories.
*
* NOTE 2: Backends still have to provide a way to extract a path from a FSIntern
*
* You may ask now: "isn't this cheating? Why do we go through all this when we use
* a path in the end anyway?!?".
* Well, for once as long as we don't provide our own file open/read/write API, we
* still have to use fopen(). Since all our targets already support fopen(), it should
* be possible to get a fopen() compatible string for any file system node.
*
* Secondly, with this abstraction layer, we still avoid a lot of complications based on
* differences in FS roots, different path separators, or even systems with no real
* paths (Mac OS 9, which doesn't even have the notion of a "current director").
* And if we ever want to support devices with no FS in the classical sense (Palm...),
* we can build upon this.
*/
/*
* TODO - Instead of starting with getRoot(), we should rather add a getDefaultDir()
* call that on Unix might return the current dir or the users home dir...
* i.e. the root dir is usually not the best starting point for browsing.
*/
#include "common/list.h"
#include "common/str.h"
class FSList;
/**
* File system node.
*/
class FilesystemNode {
protected:
typedef Common::String String;
public:
/**
* Flag to tell listDir() which kind of files to list.
*/
typedef enum {
kListFilesOnly = 1,
kListDirectoriesOnly = 2,
kListAll = 3
} ListMode;
/**
* Returns a special node representing the FS root. The starting point for
* any file system browsing.
* On Unix, this will be simply the node for / (the root directory).
* On Windows, it will be a special node which "contains" all drives (C:, D:, E:).
*/
static FilesystemNode *getRoot();
/*
* Construct a node based on a path; the path is in the same format as it
* would be for calls to fopen().
*
* I.e. getNodeForPath(oldNode.path()) should create a new node identical to oldNode.
*/
// static FilesystemNode *getNodeForPath(const String &path);
virtual ~FilesystemNode() {}
/**
* Return display name, used by e.g. the GUI to present the file in the file browser.
* @return the display name
*/
virtual String displayName() const = 0;
/**
* Is this node valid (i.e. referring to an actual FS object)?
*/
virtual bool isValid() const = 0;
/**
* Is this node a directory or not?
*/
virtual bool isDirectory() const = 0;
/**
* A path representation suitable for use with fopen()
*/
virtual String path() const = 0;
/**
* List the content of this directory node.
* If this node is not a directory, throw an exception or call error().
*/
virtual FSList *listDir(ListMode mode = kListDirectoriesOnly) const = 0;
/**
* The parent node of this directory.
* The parent of the root is the root itself
*/
virtual FilesystemNode *parent() const = 0;
/**
* Return a clone of this node allocated with new().
*/
virtual FilesystemNode *clone() const = 0;
/**
* Compare the name of this node to the name of another.
*/
virtual bool operator< (const FilesystemNode& node) const
{
return displayName() < node.displayName();
}
};
/**
* Sorted list of multiple file system nodes. E.g. the contents of a given directory.
*/
class FSList : Common::List<FilesystemNode *> {
public:
class ConstIterator {
friend class FSList;
FilesystemNode **_data;
ConstIterator(FilesystemNode **data) : _data(data) { }
public:
const FilesystemNode &operator *() const { return **_data; }
const FilesystemNode *operator->() const { return *_data; }
bool operator !=(const ConstIterator &iter) const { return _data != iter._data; }
void operator ++() { ++_data; }
};
~FSList() {
for (int i = 0; i < _size; i++)
delete _data[i];
}
void push_back(const FilesystemNode &element) {
ensureCapacity(_size + 1);
// Determine where to insert the item.
// TODO this is inefficient, should use binary search instead
int i = 0;
while (i < _size && *_data[i] < element)
i++;
if (i < _size)
memmove(&_data[i + 1], &_data[i], (_size - i) * sizeof(FilesystemNode *));
_data[i] = element.clone();
_size++;
}
const FilesystemNode& operator [](int idx) const {
assert(idx >= 0 && idx < _size);
return *_data[idx];
}
int size() const { return _size; }
ConstIterator begin() const {
return ConstIterator(_data);
}
ConstIterator end() const {
return ConstIterator(_data + _size);
}
};
#endif
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