411 lines
9.2 KiB
C++
411 lines
9.2 KiB
C++
/* Mednafen - Multi-system Emulator
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mednafen.h"
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#include "FileWrapper.h"
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#include <trio/trio.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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//#include <unistd.h> //zero 07-feb-2012
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#ifdef _MSC_VER
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#include <io.h>
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#endif
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#include <string.h>
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#ifdef _MSC_VER
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#define S_IRUSR _S_IREAD
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#define S_IWUSR _S_IWRITE
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#endif
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//TODO - change FOP crap to separate functions. this was just less work at the time.
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FILE* headless_fopen(const char* path, const char* mode);
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int headless_fclose(FILE* fp);
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int64 headless_fop(FOP op, void* ptr, int64 a, int64 b, FILE* fp);
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// Some really bad preprocessor abuse follows to handle platforms that don't have fseeko and ftello...and of course
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// for largefile support on Windows:
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#ifndef HAVE_FSEEKO
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#define fseeko fseek
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#endif
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#ifndef HAVE_FTELLO
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#define ftello ftell
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#endif
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#if SIZEOF_OFF_T == 4
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#ifdef HAVE_FOPEN64
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#define fopen fopen64
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#endif
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#ifdef HAVE_FTELLO64
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#undef ftello
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#define ftello ftello64
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#endif
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#ifdef HAVE_FSEEKO64
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#undef fseeko
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#define fseeko fseeko64
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#endif
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#ifdef HAVE_FSTAT64
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#define fstat fstat64
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#define stat stat64
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#endif
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#endif
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// For special uses, IE in classes that take a path or a FileWrapper & in the constructor, and the FileWrapper non-pointer member
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// is in the initialization list for the path constructor but not the constructor with FileWrapper&
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#if 0
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FileWrapper::FileWrapper()
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{
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fp = NULL;
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}
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#endif
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#if 0
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FileWrapper::FileWrapper(FileWrapper &original) : OpenedMode(original.OpenedMode)
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{
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int fd;
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int duped_fd;
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path_save = original.path_save;
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original.flush();
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fd = fileno(original.fp);
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if(-1 == (duped_fd = dup(fd)))
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error duping file descriptor: %s"), ene.StrError()));
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}
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if(!(fp = fdopen(duped_fd, (OpenedMode == MODE_READ) ? "rb" : "wb")))
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error during fdopen(): %s"), ene.StrError()));
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}
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}
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#endif
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FileWrapper::FileWrapper(const char *path, const int mode, const char *purpose) : OpenedMode(mode)
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{
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path_save = std::string(path);
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if(mode == MODE_READ)
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fp = headless_fopen(path, "rb");
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else if(mode == MODE_WRITE)
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fp = headless_fopen(path, "wb");
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else if(mode == MODE_WRITE_SAFE) // SO ANNOYING
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{
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int open_flags = O_WRONLY | O_CREAT | O_EXCL;
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#ifdef O_BINARY
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open_flags |= O_BINARY;
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#elif defined(_O_BINARY)
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open_flags |= _O_BINARY;
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#endif
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#if defined(S_IRGRP) && defined(S_IROTH)
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int tmpfd = open(path, open_flags, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
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#else
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int tmpfd = open(path, open_flags, S_IRUSR | S_IWUSR);
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#endif
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if(tmpfd == -1)
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{
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ErrnoHolder ene(errno);
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if(purpose)
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throw(MDFN_Error(ene.Errno(), _("Error opening file \"%s\" for \"%s\": %s"), path_save.c_str(), purpose, ene.StrError()));
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else
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throw(MDFN_Error(ene.Errno(), _("Error opening file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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fp = fdopen(tmpfd, "wb");
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}
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if(!fp)
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{
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ErrnoHolder ene(errno);
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if(purpose)
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throw(MDFN_Error(ene.Errno(), _("Error opening file \"%s\" for \"%s\": %s"), path_save.c_str(), purpose, ene.StrError()));
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else
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throw(MDFN_Error(ene.Errno(), _("Error opening file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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FileWrapper::~FileWrapper()
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{
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try
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{
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close();
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}
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catch(std::exception &e)
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{
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MDFND_PrintError(e.what());
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}
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}
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void FileWrapper::close(void)
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{
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if(fp)
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{
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FILE *tmp = fp;
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fp = NULL;
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if(headless_fclose(tmp) == EOF)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error closing opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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}
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uint64 FileWrapper::read(void *data, uint64 count, bool error_on_eof)
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{
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uint64 read_count;
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headless_fop(FOP_clearerr,0,0,0,fp);
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read_count = headless_fop(FOP_fread, data, 1, count, fp);
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if(read_count != count)
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{
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ErrnoHolder ene(errno);
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if(headless_fop(FOP_ferror,NULL,0,0,fp))
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throw(MDFN_Error(ene.Errno(), _("Error reading from opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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if(error_on_eof)
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throw(MDFN_Error(ene.Errno(), _("Error reading from opened file \"%s\": %s"), path_save.c_str(), "EOF"));
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}
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return(read_count);
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}
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void FileWrapper::flush(void)
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{
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if(headless_fop(FOP_fflush, 0, 0, 0, fp) == EOF)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error flushing to opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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void FileWrapper::write(const void *data, uint64 count)
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{
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if(headless_fop(FOP_fwrite, (void*)data, 1, count, fp) != count)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error writing to opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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static int TIN(trio_pointer_t ptr)
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{
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int c = 0;
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uint64 ret = ((FileWrapper*)ptr)->read(&c,1,false);
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if(ret == 0) return EOF;
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else return c;
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}
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static int TOUT(trio_pointer_t ptr, int c)
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{
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((FileWrapper*)ptr)->write(&c,1);
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return 1;
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}
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int FileWrapper::scanf(const char *format, ...)
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{
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va_list ap;
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int ret;
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headless_fop(FOP_clearerr,0,0,0,fp);
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va_start(ap, format);
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ret = trio_vcscanf(TIN, this, format, ap);
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va_end(ap);
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if(headless_fop(FOP_ferror,NULL,0,0,fp))
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error reading from opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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//if(ret < 0 || ret == EOF)
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// throw(MDFN_Error(0, _("%s error on format string \"%s\""), "trio_vfscanf()", format));
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return(ret);
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}
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void FileWrapper::printf(const char *format, ...)
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{
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va_list ap;
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headless_fop(FOP_clearerr,0,0,0,fp);
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va_start(ap, format);
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trio_vcprintf(TOUT, this, format, ap);
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va_end(ap);
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if(headless_fop(FOP_ferror,NULL,0,0,fp))
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error writing to opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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void FileWrapper::put_char(int c)
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{
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/*if(fputc(c, fp) == EOF)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error writing to opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}*/
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uint8 b = (uint8)c;
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write(&b,1);
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}
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void FileWrapper::put_string(const char *str)
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{
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write(str, strlen(str));
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}
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// We need to decide whether to prohibit NULL characters in output and input strings via std::string.
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// Yes for correctness, no for potential security issues(though unlikely in context all things considered).
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void FileWrapper::put_string(const std::string &str)
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{
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write(str.data(), str.size());
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}
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char * myfgets(char *buf, int bsize, FileWrapper *fp)
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{
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int i;
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int c;
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int done = 0;
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if (buf == 0 || bsize <= 0 || fp == 0)
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return 0;
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for (i = 0; !done && i < bsize - 1; i++) {
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c = TIN(fp);
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if (c == EOF) {
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done = 1;
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i--;
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} else {
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buf[i] = c;
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if (c == '\n')
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done = 1;
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}
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}
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buf[i] = '\0';
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if (i == 0)
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return 0;
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else
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return buf;
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}
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char *FileWrapper::get_line(char *buf_s, int buf_size)
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{
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char *ret;
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headless_fop(FOP_clearerr,0,0,0,fp);
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ret = ::myfgets(buf_s, buf_size, this);
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if(headless_fop(FOP_ferror,NULL,0,0,fp))
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error reading line in opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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return(ret);
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}
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void FileWrapper::seek(int64 offset, int whence)
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{
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if(headless_fop(FOP_fseeko, NULL, offset, whence, fp) == -1)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error seeking in opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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}
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int64 FileWrapper::size(void)
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{
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struct stat buf;
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return headless_fop(FOP_size, NULL, 0, 0, fp);
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//to be implemented in the filesystem dispatcher
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//if(fstat(fileno(fp), &buf) == -1)
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//{
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// ErrnoHolder ene(errno);
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// throw(MDFN_Error(ene.Errno(), _("Error getting the size of opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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//}
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//return(buf.st_size);
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/* TODO for systems without fstat()?
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int64 orig_pos = tell();
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int64 ret;
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seek(0, SEEK_END);
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ret = tell();
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seek(orig_pos, SEEK_SET);
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*/
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}
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int64 FileWrapper::tell(void)
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{
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int64 offset;
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offset = headless_fop(FOP_ftello,0,0,0,fp);
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if(offset == -1)
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{
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ErrnoHolder ene(errno);
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throw(MDFN_Error(ene.Errno(), _("Error getting position in opened file \"%s\": %s"), path_save.c_str(), ene.StrError()));
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}
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return(offset);
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}
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