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/*************************************************************************
** SourceInput.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2021 Martin Gieseking <martin.gieseking@uos.de> **
** **
** 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 3 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, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <fstream>
#include <iostream>
#include "FileSystem.hpp"
#include "Message.hpp"
#include "MessageException.hpp"
#include "SourceInput.hpp"
#include "utility.hpp"
#ifdef _WIN32
# include <fcntl.h>
# include <sys/stat.h>
# include <windows.h>
#else
# include <config.h>
# ifdef HAVE_UMASK
# include <sys/stat.h>
# endif
#endif
#ifdef _MSC_VER
# include <io.h>
#else
# include <cstdlib>
# include <unistd.h>
#endif
using namespace std;
#ifdef _WIN32
static int fdwrite (int fd, const char *buf, size_t len) {return _write(fd, buf, len);}
static int fdclose (int fd) {return _close(fd);}
#else
static int fdwrite (int fd, const char *buf, size_t len) {return write(fd, buf, len);}
static int fdclose (int fd) {return close(fd);}
#endif
/** Creates a new temporary file in the configured tmp folder.
* If the object already holds an opened temporary file, it's closed
* and removed before creating the new one.
* @return true on success */
bool TemporaryFile::create () {
if (opened())
close();
_path = FileSystem::tmpdir();
#ifndef _WIN32
_path += "stdinXXXXXX";
#ifdef HAVE_UMASK
mode_t mode_mask = umask(S_IXUSR | S_IRWXG | S_IRWXO); // set file permissions to 0600
#endif
_fd = mkstemp(&_path[0]);
#ifdef HAVE_UMASK
umask(mode_mask);
#endif
#else // !_WIN32
char fname[MAX_PATH];
std::replace(_path.begin(), _path.end(), '/', '\\');
if (GetTempFileName(_path.c_str(), "stdin", 0, fname)) {
_fd = _open(fname, _O_CREAT | _O_WRONLY | _O_BINARY, _S_IWRITE);
_path = fname;
}
#endif
return opened();
}
/** Writes a sequence of characters to the file.
* @param[in] buf buffer containing the characters to write
* @param[in] len number of characters to write
* @return true on success */
bool TemporaryFile::write (const char *buf, size_t len) {
return opened() && fdwrite(_fd, buf, len) >= 0;
}
/** Closes and removes the temporary file.
* @return true on success */
bool TemporaryFile::close () {
bool ok = true;
if (opened()) {
ok = (fdclose(_fd) >= 0);
FileSystem::remove(_path);
_fd = -1;
_path.clear();
}
return ok;
}
////////////////////////////////////////////////////////////////
istream& SourceInput::getInputStream (bool showMessages) {
if (!_ifs.is_open()) {
if (!_fname.empty())
_ifs.open(_fname, ios::binary);
else {
#ifdef _WIN32
if (_setmode(_fileno(stdin), _O_BINARY) == -1)
throw MessageException("can't open stdin in binary mode");
#endif
if (!_tmpfile.create())
throw MessageException("can't create temporary file for writing");
if (showMessages)
Message::mstream() << "reading from " << getMessageFileName() << '\n';
char buf[1024];
while (cin) {
cin.read(buf, 1024);
size_t count = cin.gcount();
if (!_tmpfile.write(buf, count))
throw MessageException("failed to write data to temporary file");
}
_ifs.open(_tmpfile.path(), ios::binary);
}
}
return _ifs;
}
string SourceInput::getFileName () const {
return _fname.empty() ? "stdin" : _fname;
}
string SourceInput::getMessageFileName () const {
return _fname.empty() ? "<stdin>" : _fname;
}
string SourceInput::getFilePath () const {
return _tmpfile.path().empty() ? _fname : _tmpfile.path();
}
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