beetle-lynx-libretro/mednafen/FileWrapper.cpp

174 lines
3.5 KiB
C++

/* Mednafen - Multi-system Emulator
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "mednafen.h"
#include "FileWrapper.h"
#include <trio/trio.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#ifdef __CELLOS_LV2__
#include <unistd.h>
#endif
// Some really bad preprocessor abuse follows to handle platforms that don't have fseeko and ftello...and of course
// for largefile support on Windows:
#define fseeko fseek
#define ftello ftell
#if SIZEOF_OFF_T == 4
#ifdef HAVE_FOPEN64
#define fopen fopen64
#endif
#ifdef HAVE_FTELLO64
#undef ftello
#define ftello ftello64
#endif
#ifdef HAVE_FSEEKO64
#undef fseeko
#define fseeko fseeko64
#endif
#ifdef HAVE_FSTAT64
#define fstat fstat64
#define stat stat64
#endif
#endif
// For special uses, IE in classes that take a path or a FileWrapper & in the constructor, and the FileWrapper non-pointer member
// is in the initialization list for the path constructor but not the constructor with FileWrapper&
FileWrapper::FileWrapper(const char *path, const int mode, const char *purpose) : OpenedMode(mode)
{
path_save = std::string(path);
if(mode == MODE_WRITE)
fp = fopen(path, "wb");
else
fp = fopen(path, "rb");
if(!fp)
{
ErrnoHolder ene(errno);
throw(MDFN_Error(ene.Errno(), _("Error opening file \"%s\": %s"), path_save.c_str(), ene.StrError()));
}
}
FileWrapper::~FileWrapper()
{
close();
}
void FileWrapper::close(void)
{
if(fp)
{
FILE *tmp = fp;
fp = NULL;
if(fclose(tmp) == EOF)
{
ErrnoHolder ene(errno);
throw(MDFN_Error(ene.Errno(), _("Error closing opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
}
}
}
uint64 FileWrapper::read(void *data, uint64 count, bool error_on_eof)
{
uint64 read_count = fread(data, 1, count, fp);
return(read_count);
}
void FileWrapper::flush(void)
{
fflush(fp);
}
void FileWrapper::write(const void *data, uint64 count)
{
fwrite(data, 1, count, fp);
}
int FileWrapper::scanf(const char *format, ...)
{
va_list ap;
int ret;
va_start(ap, format);
ret = trio_vfscanf(fp, format, ap);
va_end(ap);
return ret;
}
void FileWrapper::put_char(int c)
{
fputc(c, fp);
}
void FileWrapper::put_string(const char *str)
{
write(str, strlen(str));
}
// We need to decide whether to prohibit NULL characters in output and input strings via std::string.
// Yes for correctness, no for potential security issues(though unlikely in context all things considered).
void FileWrapper::put_string(const std::string &str)
{
write(str.data(), str.size());
}
char *FileWrapper::get_line(char *buf_s, int buf_size)
{
return ::fgets(buf_s, buf_size, fp);
}
void FileWrapper::seek(int64 offset, int whence)
{
fseeko(fp, offset, whence);
}
int64 FileWrapper::size(void)
{
struct stat buf;
fstat(fileno(fp), &buf);
return(buf.st_size);
}
int64 FileWrapper::tell(void)
{
return ftello(fp);
}