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/* 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.
*
* $URL$
* $Id$
*
*/
#ifndef COMMON_FILE_H
#define COMMON_FILE_H
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/str.h"
#include "common/stream.h"
class FilesystemNode;
namespace Common {
class File : public SeekableReadStream, public WriteStream {
protected:
/** POSIX file handle to the actual file; 0 if no file is open. */
FILE *_handle;
/** Status flag which tells about recent I/O failures. */
bool _ioFailed;
/** Simple ref-counter for File objects. */
int32 _refcount;
/** The name of this file, for debugging. */
String _name;
private:
// Disallow copying File objects. There is not strict reason for this,
// except that so far we never had real need for such a feature, and
// code that accidentally copied File objects tended to break in strange
// ways.
File(const File &f);
File &operator =(const File &f);
public:
enum AccessMode {
kFileReadMode = 1,
kFileWriteMode = 2
};
static void addDefaultDirectory(const String &directory);
static void addDefaultDirectoryRecursive(const String &directory, int level = 4, const String &prefix = "");
static void addDefaultDirectory(const FilesystemNode &directory);
static void addDefaultDirectoryRecursive(const FilesystemNode &directory, int level = 4, const String &prefix = "");
static void resetDefaultDirectories();
File();
virtual ~File();
/**
* Checks if a given file exists in any of the current default paths
* (those were/are added by addDefaultDirectory and/or
* addDefaultDirectoryRecursive).
*
* @param filename: the file to check for
* @return: true if the file exists, else false
*/
static bool exists(const String &filename);
/**
* Increases the reference counter of the file object.
* This can be used to share file objects between different
* parts of the code. Some systems (like Symbian don't support
* it thought). It should just be used on file objects
* allocated with new, since decRef destroies the object
* with delete if the counter reaches zero.
*
* This is a possible candidate to be reworked in the future
* see the TODO list for more information.
*/
void incRef();
/**
* Decreases the reference counter of the file object.
* If the counter is zero after this call, the file object will
* be deleted, with delete. It should just be used on file objects
* allocated with new out of that reason.
*
* This is a possible candidate to be reworked in the future
* see the TODO list for more information.
*/
void decRef();
virtual bool open(const String &filename, AccessMode mode = kFileReadMode);
virtual bool open(const FilesystemNode &node, AccessMode mode = kFileReadMode);
virtual void close();
/**
* Checks if the object opened a file successfully.
*
* @return: true if any file is opened, false otherwise.
*/
bool isOpen() const;
/**
* Returns the filename of the opened file.
*
* @return: the filename
*/
const char *name() const { return _name.c_str(); }
bool ioFailed() const;
void clearIOFailed();
bool eos() const { return eof(); }
/**
* Checks for end of file.
*
* @return: true if the end of file is reached, false otherwise.
*/
bool eof() const;
uint32 pos() const;
uint32 size() const;
void seek(int32 offs, int whence = SEEK_SET);
uint32 read(void *dataPtr, uint32 dataSize);
uint32 write(const void *dataPtr, uint32 dataSize);
};
} // End of namespace Common
#endif
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