RetroArch/file_ops.c
2014-10-21 23:53:09 +02:00

195 lines
4.2 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2014 - Daniel De Matteis
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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 RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "file_ops.h"
#include <stdlib.h>
#include <boolean.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <compat/strl.h>
#include <compat/posix_string.h>
#include <retro_miscellaneous.h>
#ifdef __HAIKU__
#include <kernel/image.h>
#endif
#if (defined(__CELLOS_LV2__) && !defined(__PSL1GHT__)) || defined(__QNX__) || defined(PSP)
#include <unistd.h> /* stat() is defined here */
#endif
#if defined(__CELLOS_LV2__)
#ifndef S_ISDIR
#define S_ISDIR(x) (x & 0040000)
#endif
#endif
#if defined(_WIN32)
#ifdef _MSC_VER
#define setmode _setmode
#endif
#ifdef _XBOX
#include <xtl.h>
#define INVALID_FILE_ATTRIBUTES -1
#else
#include <io.h>
#include <fcntl.h>
#include <direct.h>
#include <windows.h>
#endif
#else
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#endif
/* Dump to file. */
bool write_file(const char *path, const void *data, size_t size)
{
bool ret = false;
FILE *file = fopen(path, "wb");
if (!file)
return false;
ret = fwrite(data, 1, size, file) == size;
fclose(file);
return ret;
}
bool write_empty_file(const char *path)
{
FILE *file = fopen(path, "w");
if (!file)
return false;
fclose(file);
return true;
}
static long read_generic_file(const char *path, void **buf)
{
long rc = 0, len = 0;
void *rom_buf = NULL;
FILE *file = fopen(path, "rb");
if (!file)
goto error;
fseek(file, 0, SEEK_END);
len = ftell(file);
rewind(file);
rom_buf = malloc(len + 1);
if (!rom_buf)
{
RARCH_ERR("Couldn't allocate memory.\n");
goto error;
}
if ((rc = fread(rom_buf, 1, len, file)) < len)
RARCH_WARN("Didn't read whole file.\n");
*buf = rom_buf;
/* Allow for easy reading of strings to be safe.
* Will only work with sane character formatting (Unix). */
((char*)rom_buf)[len] = '\0';
fclose(file);
return rc;
error:
if (file)
fclose(file);
free(rom_buf);
*buf = NULL;
return -1;
}
/* Generic file loader. */
long read_file(const char *path, void **buf)
{
/* Here we check, whether the file, we are about to read is
* inside an archive, or not.
*
* We determine, whether a file is inside a compressed archive,
* by checking for the # inside the URL.
*
* For example: fullpath: /home/user/game.7z/mygame.rom
* carchive_path: /home/user/game.7z
* */
#ifdef HAVE_COMPRESSION
if (path_contains_compressed_file(path))
return read_compressed_file(path,buf,0);
#endif
return read_generic_file(path,buf);
}
/* Reads file content as one string. */
bool read_file_string(const char *path, char **buf)
{
*buf = NULL;
FILE *file = fopen(path, "r");
long len = 0;
char *ptr = NULL;
if (!file)
goto error;
/* ftell with "r" can be troublesome ...
* Haven't run into issues yet though. */
fseek(file, 0, SEEK_END);
/* Takes account of being able to read
* in EOF and '\0' at end. */
len = ftell(file) + 2;
rewind(file);
*buf = (char*)calloc(len, sizeof(char));
if (!*buf)
goto error;
ptr = *buf;
while (ptr && !feof(file))
{
size_t bufsize = (size_t)(((ptrdiff_t)*buf +
(ptrdiff_t)len) - (ptrdiff_t)ptr);
fgets(ptr, bufsize, file);
ptr += strlen(ptr);
}
ptr = strchr(ptr, EOF);
if (ptr)
*ptr = '\0';
fclose(file);
return true;
error:
if (file)
fclose(file);
if (*buf)
free(*buf);
return false;
}