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Genesis-Plus-GX/libretro/libretro-common/streams/file_stream.c
twinaphex cf1e6fdf11 Sync both repos
2017-09-06 18:59:04 +02:00

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14 KiB
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/* Copyright (C) 2010-2017 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (file_stream.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#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
# if defined(PSP)
# include <pspiofilemgr.h>
# endif
# include <sys/types.h>
# include <sys/stat.h>
# if !defined(VITA)
# include <dirent.h>
# endif
# include <unistd.h>
#endif
#ifdef __CELLOS_LV2__
#include <cell/cell_fs.h>
#define O_RDONLY CELL_FS_O_RDONLY
#define O_WRONLY CELL_FS_O_WRONLY
#define O_CREAT CELL_FS_O_CREAT
#define O_TRUNC CELL_FS_O_TRUNC
#define O_RDWR CELL_FS_O_RDWR
#else
#include <fcntl.h>
#endif
#include <streams/file_stream.h>
#include <memmap.h>
#include <retro_miscellaneous.h>
struct RFILE
{
unsigned hints;
char *ext;
long long int size;
#if defined(PSP)
SceUID fd;
#else
#define HAVE_BUFFERED_IO 1
#define MODE_STR_READ "r"
#define MODE_STR_READ_UNBUF "rb"
#define MODE_STR_WRITE_UNBUF "wb"
#define MODE_STR_WRITE_PLUS "w+"
#if defined(HAVE_BUFFERED_IO)
FILE *fp;
#endif
#if defined(HAVE_MMAP)
uint8_t *mapped;
uint64_t mappos;
uint64_t mapsize;
#endif
int fd;
#endif
};
int filestream_get_fd(RFILE *stream)
{
if (!stream)
return -1;
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
return fileno(stream->fp);
#endif
return stream->fd;
}
const char *filestream_get_ext(RFILE *stream)
{
if (!stream)
return NULL;
return stream->ext;
}
long long int filestream_get_size(RFILE *stream)
{
if (!stream)
return 0;
return stream->size;
}
void filestream_set_size(RFILE *stream)
{
if (!stream)
return;
filestream_seek(stream, 0, SEEK_SET);
filestream_seek(stream, 0, SEEK_END);
stream->size = filestream_tell(stream);
filestream_seek(stream, 0, SEEK_SET);
}
RFILE *filestream_open(const char *path, unsigned mode, ssize_t len)
{
int flags = 0;
int mode_int = 0;
#if defined(HAVE_BUFFERED_IO)
const char *mode_str = NULL;
#endif
RFILE *stream = (RFILE*)calloc(1, sizeof(*stream));
if (!stream)
return NULL;
(void)mode_int;
(void)flags;
stream->hints = mode;
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP && (stream->hints & 0xff) == RFILE_MODE_READ)
stream->hints |= RFILE_HINT_UNBUFFERED;
else
#endif
stream->hints &= ~RFILE_HINT_MMAP;
switch (mode & 0xff)
{
case RFILE_MODE_READ_TEXT:
#if defined(PSP)
mode_int = 0666;
flags = PSP_O_RDONLY;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = MODE_STR_READ;
#endif
/* No "else" here */
flags = O_RDONLY;
#endif
break;
case RFILE_MODE_READ:
#if defined(PSP)
mode_int = 0666;
flags = PSP_O_RDONLY;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = MODE_STR_READ_UNBUF;
#endif
/* No "else" here */
flags = O_RDONLY;
#endif
break;
case RFILE_MODE_WRITE:
#if defined(PSP)
mode_int = 0666;
flags = PSP_O_CREAT | PSP_O_WRONLY | PSP_O_TRUNC;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = MODE_STR_WRITE_UNBUF;
#endif
else
{
flags = O_WRONLY | O_CREAT | O_TRUNC;
#ifndef _WIN32
flags |= S_IRUSR | S_IWUSR;
#endif
}
#endif
break;
case RFILE_MODE_READ_WRITE:
#if defined(PSP)
mode_int = 0666;
flags = PSP_O_RDWR;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = MODE_STR_WRITE_PLUS;
#endif
else
{
flags = O_RDWR;
#ifdef _WIN32
flags |= O_BINARY;
#endif
}
#endif
break;
}
#if defined(PSP)
stream->fd = sceIoOpen(path, flags, mode_int);
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0 && mode_str)
{
stream->fp = fopen(path, mode_str);
if (!stream->fp)
goto error;
}
else
#endif
{
/* FIXME: HAVE_BUFFERED_IO is always 1, but if it is ever changed, open() needs to be changed to _wopen() for WIndows. */
stream->fd = open(path, flags, mode_int);
if (stream->fd == -1)
goto error;
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
{
stream->mappos = 0;
stream->mapped = NULL;
stream->mapsize = filestream_seek(stream, 0, SEEK_END);
if (stream->mapsize == (uint64_t)-1)
goto error;
filestream_rewind(stream);
stream->mapped = (uint8_t*)mmap((void*)0,
stream->mapsize, PROT_READ, MAP_SHARED, stream->fd, 0);
if (stream->mapped == MAP_FAILED)
stream->hints &= ~RFILE_HINT_MMAP;
}
#endif
}
#endif
#if defined(PSP)
if (stream->fd == -1)
goto error;
#endif
{
const char *ld = (const char*)strrchr(path, '.');
stream->ext = strdup(ld ? ld + 1 : "");
}
filestream_set_size(stream);
return stream;
error:
filestream_close(stream);
return NULL;
}
char *filestream_getline(RFILE *stream)
{
char* newline = (char*)malloc(9);
char* newline_tmp = NULL;
size_t cur_size = 8;
size_t idx = 0;
int in = filestream_getc(stream);
if (!newline)
return NULL;
while (in != EOF && in != '\n')
{
if (idx == cur_size)
{
cur_size *= 2;
newline_tmp = (char*)realloc(newline, cur_size + 1);
if (!newline_tmp)
{
free(newline);
return NULL;
}
newline = newline_tmp;
}
newline[idx++] = in;
in = filestream_getc(stream);
}
newline[idx] = '\0';
return newline;
}
char *filestream_gets(RFILE *stream, char *s, size_t len)
{
if (!stream)
return NULL;
#if defined(HAVE_BUFFERED_IO)
return fgets(s, (int)len, stream->fp);
#elif defined(PSP)
if(filestream_read(stream,s,len)==len)
return s;
return NULL;
#else
return gets(s);
#endif
}
int filestream_getc(RFILE *stream)
{
char c = 0;
(void)c;
if (!stream)
return 0;
#if defined(HAVE_BUFFERED_IO)
return fgetc(stream->fp);
#elif defined(PSP)
if(filestream_read(stream, &c, 1) == 1)
return (int)c;
return EOF;
#else
return getc(stream->fd);
#endif
}
ssize_t filestream_seek(RFILE *stream, ssize_t offset, int whence)
{
if (!stream)
goto error;
#if defined(PSP)
if (sceIoLseek(stream->fd, (SceOff)offset, whence) == -1)
goto error;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
return fseek(stream->fp, (long)offset, whence);
#endif
#ifdef HAVE_MMAP
/* Need to check stream->mapped because this function is
* called in filestream_open() */
if (stream->mapped && stream->hints & RFILE_HINT_MMAP)
{
/* fseek() returns error on under/overflow but allows cursor > EOF for
read-only file descriptors. */
switch (whence)
{
case SEEK_SET:
if (offset < 0)
goto error;
stream->mappos = offset;
break;
case SEEK_CUR:
if ((offset < 0 && stream->mappos + offset > stream->mappos) ||
(offset > 0 && stream->mappos + offset < stream->mappos))
goto error;
stream->mappos += offset;
break;
case SEEK_END:
if (stream->mapsize + offset < stream->mapsize)
goto error;
stream->mappos = stream->mapsize + offset;
break;
}
return stream->mappos;
}
#endif
if (lseek(stream->fd, offset, whence) < 0)
goto error;
#endif
return 0;
error:
return -1;
}
int filestream_eof(RFILE *stream)
{
size_t current_position = filestream_tell(stream);
size_t end_position = filestream_seek(stream, 0, SEEK_END);
filestream_seek(stream, current_position, SEEK_SET);
if (current_position >= end_position)
return 1;
return 0;
}
ssize_t filestream_tell(RFILE *stream)
{
if (!stream)
goto error;
#if defined(PSP)
if (sceIoLseek(stream->fd, 0, SEEK_CUR) < 0)
goto error;
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
return ftell(stream->fp);
#endif
#ifdef HAVE_MMAP
/* Need to check stream->mapped because this function
* is called in filestream_open() */
if (stream->mapped && stream->hints & RFILE_HINT_MMAP)
return stream->mappos;
#endif
if (lseek(stream->fd, 0, SEEK_CUR) < 0)
goto error;
#endif
return 0;
error:
return -1;
}
void filestream_rewind(RFILE *stream)
{
filestream_seek(stream, 0L, SEEK_SET);
}
ssize_t filestream_read(RFILE *stream, void *s, size_t len)
{
if (!stream || !s)
goto error;
#if defined(PSP)
return sceIoRead(stream->fd, s, len);
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
return fread(s, 1, len, stream->fp);
#endif
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
{
if (stream->mappos > stream->mapsize)
goto error;
if (stream->mappos + len > stream->mapsize)
len = stream->mapsize - stream->mappos;
memcpy(s, &stream->mapped[stream->mappos], len);
stream->mappos += len;
return len;
}
#endif
return read(stream->fd, s, len);
#endif
error:
return -1;
}
int filestream_flush(RFILE *stream)
{
#if defined(HAVE_BUFFERED_IO)
return fflush(stream->fp);
#else
return 0;
#endif
}
ssize_t filestream_write(RFILE *stream, const void *s, size_t len)
{
if (!stream)
goto error;
#if defined(PSP)
return sceIoWrite(stream->fd, s, len);
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
return fwrite(s, 1, len, stream->fp);
#endif
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
goto error;
#endif
return write(stream->fd, s, len);
#endif
error:
return -1;
}
int filestream_putc(RFILE *stream, int c)
{
if (!stream)
return EOF;
#if defined(HAVE_BUFFERED_IO)
return fputc(c, stream->fp);
#else
/* unimplemented */
return EOF;
#endif
}
int filestream_close(RFILE *stream)
{
if (!stream)
goto error;
if (stream->ext)
free(stream->ext);
#if defined(PSP)
if (stream->fd > 0)
sceIoClose(stream->fd);
#else
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
{
if (stream->fp)
fclose(stream->fp);
}
else
#endif
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
munmap(stream->mapped, stream->mapsize);
#endif
if (stream->fd > 0)
close(stream->fd);
#endif
free(stream);
return 0;
error:
return -1;
}
/**
* filestream_read_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.
*/
int filestream_read_file(const char *path, void **buf, ssize_t *len)
{
ssize_t ret = 0;
ssize_t content_buf_size = 0;
void *content_buf = NULL;
RFILE *file = filestream_open(path, RFILE_MODE_READ, -1);
if (!file)
{
fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
goto error;
}
if (filestream_seek(file, 0, SEEK_END) != 0)
goto error;
content_buf_size = filestream_tell(file);
if (content_buf_size < 0)
goto error;
filestream_rewind(file);
content_buf = malloc(content_buf_size + 1);
if (!content_buf)
goto error;
ret = filestream_read(file, content_buf, content_buf_size);
if (ret < 0)
{
fprintf(stderr, "Failed to read %s: %s\n", path, strerror(errno));
goto error;
}
filestream_close(file);
*buf = content_buf;
/* Allow for easy reading of strings to be safe.
* Will only work with sane character formatting (Unix). */
((char*)content_buf)[ret] = '\0';
if (len)
*len = ret;
return 1;
error:
if (file)
filestream_close(file);
if (content_buf)
free(content_buf);
if (len)
*len = -1;
*buf = NULL;
return 0;
}
/**
* filestream_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 filestream_write_file(const char *path, const void *data, ssize_t size)
{
ssize_t ret = 0;
RFILE *file = filestream_open(path, RFILE_MODE_WRITE, -1);
if (!file)
return false;
ret = filestream_write(file, data, size);
filestream_close(file);
if (ret != size)
return false;
return true;
}
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