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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>
// Use a tmpfile as a buffer for a C++/C I/O interface.
namespace Dimension
{
namespace
{
// Write an input stream completely to a FILE*; this works poorly for
// console input, which may not have an EOF in the near future
void
write_cookie(FILE* file, std::istream& istr)
{
const unsigned int bs = 8192; // Bytes to read at once
unsigned int count, pos;
char buffer[bs];
pos = istr.tellg(); // Get the stream's current position
istr.seekg(0); // Seek to the beginning
while (true) {
// Read the whole stream into `file', `bs' bytes at a time
istr.read(buffer, bs);
count = istr.gcount();
if (count != bs) {
if (istr.eof()) {
// We reached EOF; write the last count bytes
fwrite(buffer, 1, count, file);
break;
} else {
// Some other error
throw Dimension_Error("Error reading from input stream.");
}
}
// Write the next `bs' bytes
fwrite(buffer, 1, bs, file);
}
fseek(file, pos, SEEK_SET); // Seek to the stream's initial position
}
// Read a C++ stream completely from a file
void
read_cookie(std::ostream& ostr, FILE* file)
{
const unsigned int bs = 8192; // Bytes to read at a time
unsigned int count, pos;
char buffer[bs];
pos = ftell(file); // Get the initial position
rewind(file); // Seek to the beginning
while (true) {
count = fread(buffer, 1, bs, file);
if (count != bs) {
if (feof(file)) {
// Reached EOF, write the last `count' bytes
ostr.write(buffer, count);
break;
} else {
// Some other error
throw Dimension_Error("Error reading from temporary file.");
}
}
// Write the next `bs' bytes
ostr.write(buffer, bs);
}
ostr.seekp(pos); // Seek to the initial position of `file'
}
}
// Make an input FILE_Cookie
FILE_Cookie::FILE_Cookie(std::istream& istr)
: m_file(std::tmpfile()), m_istr(&istr), m_ostr(0)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
// Write the input stream to the temporary file
write_cookie(m_file, *m_istr);
}
// Make an output FILE_Cookie
FILE_Cookie::FILE_Cookie(std::ostream& ostr)
: m_file(std::tmpfile()), m_istr(0), m_ostr(&ostr)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
}
// Make an I/O FILE_Cookie
FILE_Cookie::FILE_Cookie(std::iostream& iostr)
: m_file(std::tmpfile()), m_istr(&iostr), m_ostr(&iostr)
{
if (!m_file) {
throw Dimension_Error("Error opening temporary file for C++/C I/O"
" interface.");
}
// Write the input stream to the temporary file
write_cookie(m_file, *m_istr);
}
// Close the tmpfile, maybe syncing a C++ stream to it first
FILE_Cookie::~FILE_Cookie() {
if (is_output()) {
read_cookie(*m_ostr, m_file);
}
std::fclose(m_file);
}
// Get the FILE*
FILE* FILE_Cookie::file() { return m_file; }
const FILE* FILE_Cookie::file() const { return m_file; }
bool FILE_Cookie::is_input() const { return m_istr; }
bool FILE_Cookie::is_output() const { return m_ostr; }
// Get the C++ streams
std::istream&
FILE_Cookie::istr()
{
if (is_input()) {
return *m_istr;
} else {
throw Dimension_Error("Attempted to get input stream from non-input"
" FILE_Cookie.");
}
}
const std::istream&
FILE_Cookie::istr() const
{
if (is_input()) {
return *m_istr;
} else {
throw Dimension_Error("Attempted to get input stream from non-input"
" FILE_Cookie.");
}
}
std::ostream&
FILE_Cookie::ostr()
{
if (is_output()) {
return *m_ostr;
} else {
throw Dimension_Error("Attempted to get output stream from non-input"
" FILE_Cookie.");
}
}
const std::ostream& FILE_Cookie::ostr() const
{
if (is_output()) {
return *m_ostr;
} else {
throw Dimension_Error("Attempted to get output stream from non-input"
" FILE_Cookie.");
}
}
}
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