/** 
 * @file llfile.h
 * @author Michael Schlachter
 * @date 2006-03-23
 * @brief Declaration of cross-platform POSIX file buffer and c++
 * stream classes.
 *
 * Copyright (c) 2006-$CurrentYear$, Linden Research, Inc.
 * $License$
 */

#ifndef LL_LLFILE_H
#define LL_LLFILE_H

/**
 * This class provides a cross platform interface to the filesystem.
 * Attempts to mostly mirror the POSIX style IO functions.
 */

#include <string>
#include <stdio.h>
#include <sys/stat.h>
#include <fstream>
#include "stdtypes.h"

typedef FILE	LLFILE;

#ifdef LL_WINDOWS
#define	USE_LLFILESTREAMS	1
#else
#define	USE_LLFILESTREAMS	0
#endif


#if LL_WINDOWS
// windows version of stat function and stat data structure are called _stat
typedef struct _stat	llstat;
#else
typedef struct stat		llstat;
#endif

class	LLFile
{
public:
	// All these functions take UTF8 path/filenames.
	static	LLFILE*	fopen(const char* filename,const char* accessmode);	/* Flawfinder: ignore */
	static	LLFILE*	_fsopen(const char* filename,const char* accessmode,int	sharingFlag);

	// perms is a permissions mask like 0777 or 0700.  In most cases it will
	// be overridden by the user's umask.  It is ignored on Windows.
	static	int		mkdir(const char* filename, int perms = 0700);

	static	int		remove(const char* filename);
	static	int		rename(const char* filename,const char*	newname);
	static	int		stat(const char*	filename,llstat*	file_status);
	static	LLFILE *	_Fiopen(const char *filename, std::ios::openmode mode,int);	// protection currently unused
};


#if USE_LLFILESTREAMS

class	llifstream	:	public	std::basic_istream < char , std::char_traits < char > >
{
	// input stream associated with a C stream
public:
	typedef std::basic_ifstream<char,std::char_traits < char > > _Myt;
	typedef std::basic_filebuf<char,std::char_traits< char > > _Myfb;
	typedef std::basic_ios<char,std::char_traits< char > > _Myios;

	llifstream()
		: std::basic_istream<char,std::char_traits< char > >(NULL,true),_Filebuffer(NULL)
	{	// construct unopened
	}

	explicit llifstream(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot);

	explicit llifstream(_Filet *_File)
		: std::basic_istream<char,std::char_traits< char > >(NULL,true),
			_Filebuffer(new _Myfb(_File))
	{	// construct with specified C stream
	}
	virtual ~llifstream();

	_Myfb *rdbuf() const
	{	// return pointer to file buffer
		return _Filebuffer;
	}
	bool is_open() const;
	void open(const char *_Filename,
		ios_base::openmode _Mode = ios_base::in,
		int _Prot = (int)ios_base::_Openprot);	/* Flawfinder: ignore */
	void close();

private:
	_Myfb* _Filebuffer;	// the file buffer
};


class	llofstream	:	public	std::basic_ostream< char , std::char_traits < char > >
{
public:
	typedef std::basic_ostream< char , std::char_traits < char > > _Myt;
	typedef std::basic_filebuf< char , std::char_traits < char > > _Myfb;
	typedef std::basic_ios<char,std::char_traits < char > > _Myios;

	llofstream()
		: std::basic_ostream<char,std::char_traits < char > >(NULL,true),_Filebuffer(NULL)
	{	// construct unopened
	}

	explicit llofstream(const char *_Filename,
		std::ios_base::openmode _Mode = ios_base::out,
		int _Prot = (int)std::ios_base::_Openprot);
	

	explicit llofstream(_Filet *_File)
		: std::basic_ostream<char,std::char_traits < char > >(NULL,true),
			_Filebuffer(new _Myfb(_File))//_File)
	{	// construct with specified C stream
	}

	virtual ~llofstream();

	_Myfb *rdbuf() const
	{	// return pointer to file buffer
		return _Filebuffer;
	}

	bool is_open() const;

	void open(const char *_Filename,ios_base::openmode _Mode = ios_base::out,int _Prot = (int)ios_base::_Openprot);	/* Flawfinder: ignore */

	void close();

private:
	_Myfb *_Filebuffer;	// the file buffer
};



#else
//Use standard file streams on non windows platforms
#define	llifstream	std::ifstream
#define	llofstream	std::ofstream

#endif


#endif // not LL_LLFILE_H