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(retro_file) Implement RFILE_HINT_MMAP

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This commit is contained in:
Higor Eurípedes 2015-11-14 14:56:00 -03:00
parent 80a89bbd36
commit eb7b46c7c1
3 changed files with 118 additions and 13 deletions
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127
libretro-common/file/retro_file.c
View File

@ -68,6 +68,7 @@
#endif
#include <retro_file.h>
#include <memmap.h>
#if 1
#define HAVE_BUFFERED_IO 1
@ -83,6 +84,11 @@ struct RFILE
unsigned hints;
#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
@ -119,6 +125,13 @@ RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len)
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)
{
case RFILE_MODE_READ:
@ -132,9 +145,9 @@ RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len)
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = "rb";
else
#endif
flags = O_RDONLY;
/* No "else" here */
flags = O_RDONLY;
#endif
break;
case RFILE_MODE_WRITE:
@ -148,8 +161,8 @@ RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len)
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = "wb";
else
#endif
else
flags = O_WRONLY | O_CREAT | O_TRUNC | S_IRUSR | S_IWUSR;
#endif
break;
@ -164,8 +177,8 @@ RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len)
#if defined(HAVE_BUFFERED_IO)
if ((stream->hints & RFILE_HINT_UNBUFFERED) == 0)
mode_str = "w+";
else
#endif
else
{
flags = O_RDWR;
#ifdef _WIN32
@ -194,6 +207,33 @@ RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len)
stream->fd = open(path, flags);
if (stream->fd == -1)
goto error;
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
{
stream->mappos = 0;
stream->mapped = NULL;
stream->mapsize = 0;
if (retro_fseek(stream, 0, SEEK_END) != 0)
goto error;
stream->mapsize = retro_ftell(stream);
if (stream->mapsize == (uint64_t)-1)
goto error;
retro_frewind(stream);
stream->mapped = mmap((void*)0, stream->mapsize, PROT_READ, MAP_SHARED, stream->fd, 0);
if (stream->mapped == MAP_FAILED)
{
#ifdef RARCH_INTERNAL
RARCH_WARN("mmap()ing %s failed: %s\n", path, strerror(errno));
#endif
stream->hints &= ~RFILE_HINT_MMAP;
}
}
#endif
}
#endif
@ -233,10 +273,46 @@ ssize_t retro_fseek(RFILE *stream, ssize_t offset, int whence)
return fseek(stream->fp, (long)offset, whence);
else
#endif
{
ret = lseek(stream->fd, offset, whence);
return ret == -1 ? -1 : 0;
}
#ifdef HAVE_MMAP
/* Need to check stream->mapped because this function is called in retro_fopen() */
if (stream->mapped && stream->hints & RFILE_HINT_MMAP)
{
switch (whence)
{
case SEEK_SET:
if (offset < 0)
offset = 0;
stream->mappos = offset;
break;
case SEEK_CUR:
if (offset < 0 && stream->mappos + offset > stream->mappos)
stream->mappos = 0;
else
stream->mappos += offset;
break;
case SEEK_END:
if (offset < 0)
offset = 0;
if (stream->mapsize - offset > stream->mapsize)
stream->mappos = 0;
else
stream->mappos = stream->mapsize - offset;
break;
}
return 0;
}
else
#endif
{
ret = lseek(stream->fd, offset, whence);
return ret == -1 ? -1 : 0;
}
#endif
}
@ -257,7 +333,13 @@ ssize_t retro_ftell(RFILE *stream)
return ftell(stream->fp);
else
#endif
return lseek(stream->fd, 0, SEEK_CUR);
#ifdef HAVE_MMAP
/* Need to check stream->mapped because this function is called in retro_fopen() */
if (stream->mapped && stream->hints & RFILE_HINT_MMAP)
return stream->mappos;
else
#endif
return lseek(stream->fd, 0, SEEK_CUR);
#endif
}
@ -283,7 +365,20 @@ ssize_t retro_fread(RFILE *stream, void *s, size_t len)
return fread(s, 1, len, stream->fp);
else
#endif
return read(stream->fd, s, len);
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
{
if (stream->mappos + len > stream->mapsize)
len = stream->mapsize - stream->mappos;
memcpy(s, &stream->mapped[stream->mappos], len);
stream->mappos += len;
return len;
}
else
#endif
return read(stream->fd, s, len);
#endif
}
@ -304,7 +399,12 @@ ssize_t retro_fwrite(RFILE *stream, const void *s, size_t len)
return fwrite(s, 1, len, stream->fp);
else
#endif
return write(stream->fd, s, len);
#ifdef HAVE_MMAP
if (stream->hints & RFILE_HINT_MMAP)
return -1;
else
return write(stream->fd, s, len);
#endif
#endif
}
@ -328,6 +428,11 @@ int retro_fclose(RFILE *stream)
}
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

2
libretro-common/include/retro_file.h
View File

@ -44,7 +44,7 @@ enum
/* There is no garantee these requests will be attended. */
RFILE_HINT_UNBUFFERED = 1<<8,
RFILE_HINT_MMAP = 1<<7
RFILE_HINT_MMAP = 1<<9 /* requires RFILE_MODE_READ */
};
RFILE *retro_fopen(const char *path, unsigned mode, ssize_t len);

2
libretro-db/libretrodb.c
View File

@ -401,7 +401,7 @@ void libretrodb_cursor_close(libretrodb_cursor_t *cursor)
int libretrodb_cursor_open(libretrodb_t *db, libretrodb_cursor_t *cursor,
libretrodb_query_t *q)
{
cursor->fd = retro_fopen(db->path, RFILE_MODE_READ | RFILE_HINT_UNBUFFERED, -1);
cursor->fd = retro_fopen(db->path, RFILE_MODE_READ | RFILE_HINT_MMAP, -1);
if (!cursor->fd)
return -errno;