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/** @file
* IPRT / No-CRT - Minimal C++ fstream header.
*/
/*
* Copyright (C) 2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 of the
* License.
*
* 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 <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef VBOX_INCLUDED_SRC_nocrt_fstream
#define VBOX_INCLUDED_SRC_nocrt_fstream
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/nocrt/ostream>
#include <iprt/stream.h>
namespace std
{
template<typename a_CharType, typename a_CharTraits /*= std::char_traits<a_CharType>*/ >
class basic_filebuf : public basic_streambuf<a_CharType, a_CharTraits>
{
protected:
PRTSTREAM m_pStrm;
bool m_fStdStream;
ios_base::openmode m_fMode;
public:
basic_filebuf(PRTSTREAM a_pStrm = NULL, bool a_fStdStream = false)
: basic_streambuf()
, m_pStrm(a_pStrm)
, m_fStdStream(a_fStdStream)
, m_fMode(ios_base::openmode(0))
{
}
virtual ~basic_filebuf()
{
if (m_pStrm)
{
if (m_fStdStream)
RTStrmClose(m_pStrm);
m_pStrm = NULL;
}
}
bool is_open() const RT_NOEXCEPT
{
return m_pStrm != NULL;
}
basic_filebuf *open(const char *a_pszFilename, ios_base::openmode a_fMode)
{
/*
* Sanitize the a_fMode first.
*/
AssertReturn(!is_open(), NULL);
AssertReturn(a_fMode & (ios_base::out | ios_base::in), NULL); /* Neither write nor read mode? */
AssertStmt((a_fMode & (ios_base::out | ios_base::app)) != ios_base::app, a_fMode &= ~ios_base::app);
AssertReturn((a_fMode & (ios_base::out | ios_base::trunc)) != ios_base::trunc, NULL);
AssertReturn(!(a_fMode & ios_base::trunc) || !(a_fMode & ios_base::app), NULL);
/*
* Translate a_fMode into a stream mode string and try open the file.
*/
char szMode[8];
szMode[0] = a_fMode & ios_base::trunc ? 'w' : a_fMode & ios_base::app ? 'a' : 'r';
size_t offMode = 1;
if ((a_fMode & (ios_base::in | ios_base::out)) == (ios_base::in | ios_base::out))
szMode[offMode++] = '+';
if (a_fMode & ios_base::binary)
szMode[offMode++] = 'b';
szMode[offMode] = '\0';
int rc = RTStrmOpen(a_pszFilename, szMode, &m_pStrm);
if (RT_SUCCESS(rc))
{
/** @todo if (a_fMode & ios_base::ate)? */
/*
* Set up the buffer?
*/
if (true)
{
return this;
}
RTStrmClose(m_pStrm);
m_pStrm = NULL;
}
return NULL;
}
protected:
bool flushBuffered()
{
/** @todo buffering. */
return true;
}
//virtual int_type overflow(int_type a_iChar) RT_OVERRIDE
//{
// if (a_iChar != traits_type::eof())
// {
// if (flushBuffered())
// {
// char_type ch = traits_type::to_char_type(a_iChar);
// int rc = RTStrmWrite(m_pStrm, &ch, sizeof(ch));
// if (RT_SUCCESS(rc))
// return a_iChar;
// }
// }
// return traits_type::eof();
//}
std::streamsize xsputn(char_type const *a_pchSrc, std::streamsize a_cchSrc) //RT_OVERRIDE
{
if (flushBuffered())
{
size_t cbWritten = 0;
int rc = RTStrmWriteEx(m_pStrm, &a_pchSrc, sizeof(a_pchSrc[0]) * a_cchSrc, &cbWritten);
if (RT_SUCCESS(rc))
return cbWritten / sizeof(a_pchSrc[0]);
}
return 0;
}
};
/**
* Basic I/O stream.
*/
template<typename a_CharType, typename a_CharTraits /*= std::char_traits<a_CharType>*/ >
class basic_ofstream : public basic_ostream<a_CharType, a_CharTraits>
{
protected:
basic_filebuf<a_CharType, a_CharTraits> m_FileBuf;
public:
basic_ofstream()
: basic_ostream(&m_FileBuf) /** @todo m_FileBuf isn't initialized yet... */
, m_FileBuf()
{
}
explicit basic_ofstream(const char *a_pszFilename, ios_base::openmode a_fMode = ios_base::out)
: basic_ostream(&m_FileBuf) /** @todo m_FileBuf isn't initialized yet... */
, m_FileBuf()
{
m_FileBuf.open(a_pszFilename, a_fMode);
}
private:
basic_ofstream(basic_ofstream const &a_rSrc); /* no copying */
basic_ofstream &operator=(basic_ofstream const &a_rSrc); /* no copying */
public:
virtual ~basic_ofstream()
{
}
public:
bool is_open() const RT_NOEXCEPT
{
return m_FileBuf.is_open();
}
basic_filebuf<a_CharType, a_CharTraits> *open(const char *a_pszFilename, ios_base::openmode a_fMode)
{
return m_FileBuf.open(a_pszFilename, a_fMode);
}
};
}
#endif /* !VBOX_INCLUDED_SRC_nocrt_fstream */
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