RetroArch/file_ops.c
Lioncash 61b8e370ca file_ops: Get rid of unnecessary if statement
fread won't null out the given buffer; nullity is already checked above the fread call.
2015-05-07 18:09:04 -04:00

261 lines
6.4 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2015 - 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 <file/file_path.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 HAVE_COMPRESSION
#include <file/file_extract.h>
#endif
#ifdef HAVE_7ZIP
#include "decompress/7zip_support.h"
#endif
#ifdef HAVE_ZLIB
#include "decompress/zip_support.h"
#endif
#ifdef __HAIKU__
#include <kernel/image.h>
#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
/**
* write_file:
* @path : path to file.
* @data : contents to write to the file.
* @size : size of the contents.
*
* Writes data to a file.
*
* Returns: true (1) on success, false (0) otherwise.
*/
bool write_file(const char *path, const void *data, ssize_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;
}
/**
* read_generic_file:
* @path : path to file.
* @buf : buffer to allocate and read the contents of the
* file into. Needs to be freed manually.
*
* Read the contents of a file into @buf.
*
* Returns: number of items read, -1 on error.
*/
static int read_generic_file(const char *path, void **buf, ssize_t *len)
{
long ret = 0;
ssize_t content_buf_size = 0;
void *content_buf = NULL;
FILE *file = fopen(path, "rb");
if (!file)
goto error;
if (fseek(file, 0, SEEK_END) != 0)
goto error;
content_buf_size = ftell(file);
if (content_buf_size < 0)
goto error;
rewind(file);
content_buf = malloc(content_buf_size + 1);
if (!content_buf)
goto error;
if ((ret = fread(content_buf, 1, content_buf_size, file)) < content_buf_size)
RARCH_WARN("Didn't read whole file.\n");
*buf = content_buf;
/* Allow for easy reading of strings to be safe.
* Will only work with sane character formatting (Unix). */
((char*)content_buf)[content_buf_size] = '\0';
if (fclose(file) != 0)
RARCH_WARN("Failed to close file stream.\n");
if (len)
*len = ret;
return 1;
error:
if (file)
fclose(file);
if (content_buf)
free(content_buf);
if (len)
*len = -1;
*buf = NULL;
return 0;
}
#ifdef HAVE_COMPRESSION
/* Generic compressed file loader.
* Extracts to buf, unless optional_filename != 0
* Then extracts to optional_filename and leaves buf alone.
*/
int read_compressed_file(const char * path, void **buf,
const char* optional_filename, ssize_t *length)
{
const char* file_ext;
char archive_path[PATH_MAX_LENGTH], *archive_found = NULL;
if (optional_filename)
{
/* Safety check.
* If optional_filename and optional_filename
* exists, we simply return 0,
* hoping that optional_filename is the
* same as requested.
*/
if(path_file_exists(optional_filename))
{
*length = 0;
return 1;
}
}
/* We split carchive path and relative path: */
strlcpy(archive_path, path, sizeof(archive_path));
archive_found = (char*)strchr(archive_path,'#');
rarch_assert(archive_found != NULL);
/* We assure that there is something after the '#' symbol. */
if (strlen(archive_found) <= 1)
{
/*
* This error condition happens for example, when
* path = /path/to/file.7z, or
* path = /path/to/file.7z#
*/
RARCH_ERR("Could not extract image path and carchive path from "
"path: %s.\n", path);
*length = 0;
return 0;
}
/* We split the string in two, by putting a \0, where the hash was: */
*archive_found = '\0';
archive_found += 1;
file_ext = path_get_extension(archive_path);
#ifdef HAVE_7ZIP
if (strcasecmp(file_ext,"7z") == 0)
{
*length = read_7zip_file(archive_path,archive_found,buf,optional_filename);
if (*length != -1)
return 1;
}
#endif
#ifdef HAVE_ZLIB
if (strcasecmp(file_ext,"zip") == 0)
{
*length = read_zip_file(archive_path,archive_found,buf,optional_filename);
if (*length != -1)
return 1;
}
#endif
return 0;
}
#endif
/**
* read_file:
* @path : path to file.
* @buf : buffer to allocate and read the contents of the
* file into. Needs to be freed manually.
* @length : Number of items read, -1 on error.
*
* Read the contents of a file into @buf. Will call read_compressed_file
* if path contains a compressed file, otherwise will call read_generic_file.
*
* Returns: 1 if file read, 0 on error.
*/
int read_file(const char *path, void **buf, ssize_t *length)
{
#ifdef HAVE_COMPRESSION
if (path_contains_compressed_file(path))
{
if (read_compressed_file(path, buf, NULL, length))
return 1;
}
#endif
return read_generic_file(path, buf, length);
}
struct string_list *compressed_file_list_new(const char *path,
const char* ext)
{
#ifdef HAVE_COMPRESSION
const char* file_ext = path_get_extension(path);
#ifdef HAVE_7ZIP
if (strcasecmp(file_ext,"7z") == 0)
return compressed_7zip_file_list_new(path,ext);
#endif
#ifdef HAVE_ZLIB
if (strcasecmp(file_ext,"zip") == 0)
return zlib_get_file_list(path, ext);
#endif
#endif
return NULL;
}