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/*************************************************************************
* Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimensionxx.hpp"
#include <stdio.h>
namespace Dimension
{
namespace
{
struct Cookie
{
public:
std::istream* istr;
std::ostream* ostr;
};
ssize_t
cookie_read(void* cookie, char* buf, size_t size)
{
Cookie* streams = reinterpret_cast<Cookie*>(cookie);
streams->istr->read(buf, size);
if (streams->istr->eof()) {
return streams->istr->gcount();
} else if (!streams->istr->good()) {
return -1;
} else {
return streams->istr->gcount();
}
}
ssize_t
cookie_write(void* cookie, const char* buf, size_t size)
{
Cookie* streams = reinterpret_cast<Cookie*>(cookie);
streams->ostr->write(buf, size);
if (!streams->ostr->good()) {
return -1;
} else {
return size;
}
}
int
cookie_seek(void* cookie, off64_t* offset, int whence)
{
Cookie* streams = reinterpret_cast<Cookie*>(cookie);
bool success = true;
if (streams->istr) {
switch (whence) {
case SEEK_SET:
streams->istr->seekg(*offset, std::ios::beg);
break;
case SEEK_CUR:
streams->istr->seekg(*offset, std::ios::cur);
break;
case SEEK_END:
streams->istr->seekg(*offset, std::ios::end);
break;
}
if (!streams->istr->good()) {
success = false;
}
}
if (streams->ostr) {
switch (whence) {
case SEEK_SET:
streams->ostr->seekp(*offset, std::ios::beg);
break;
case SEEK_CUR:
streams->ostr->seekp(*offset, std::ios::cur);
break;
case SEEK_END:
streams->ostr->seekp(*offset, std::ios::end);
}
if (!streams->ostr->good()) {
success = false;
}
}
return !success;
}
int
cookie_close(void* cookie)
{
delete reinterpret_cast<Cookie*>(cookie);
}
}
std::FILE*
fcookie(std::istream& istr)
{
Cookie* cookie = new Cookie;
cookie->istr = &istr;
cookie->ostr = 0;
cookie_io_functions_t io_funcs;
io_funcs.read = &cookie_read;
io_funcs.write = 0;
io_funcs.seek = &cookie_seek;
io_funcs.close = &cookie_close;
return fopencookie(reinterpret_cast<void*>(cookie), "r", io_funcs);
}
std::FILE*
fcookie(std::ostream& ostr)
{
Cookie* cookie = new Cookie;
cookie->istr = 0;
cookie->ostr = &ostr;
cookie_io_functions_t io_funcs;
io_funcs.read = 0;
io_funcs.write = &cookie_write;
io_funcs.seek = &cookie_seek;
io_funcs.close = &cookie_close;
return fopencookie(reinterpret_cast<void*>(cookie), "w", io_funcs);
}
std::FILE*
fcookie(std::iostream& iostr)
{
Cookie* cookie = new Cookie;
cookie->istr = &iostr;
cookie->ostr = &iostr;
cookie_io_functions_t io_funcs;
io_funcs.read = &cookie_read;
io_funcs.write = &cookie_write;
io_funcs.seek = &cookie_seek;
io_funcs.close = &cookie_close;
return fopencookie(reinterpret_cast<void*>(cookie), "r+", io_funcs);
}
}
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