sh_off_t file_size;
sh_off_t file_extend;
sh_off_t window_pos;
+ uns window_size;
int mode;
};
#define FB_MMAP(f) ((struct fb_mmap *)(f)->is_fastbuf)
sh_off_t pos0 = f->pos & ~(sh_off_t)(CPU_PAGE_SIZE-1);
int l = MIN((sh_off_t)mmap_window_size, F->file_extend - pos0);
uns ll = ALIGN_TO(l, CPU_PAGE_SIZE);
- uns oll = ALIGN_TO(f->bufend - f->buffer, CPU_PAGE_SIZE);
int prot = ((F->mode & O_ACCMODE) == O_RDONLY) ? PROT_READ : (PROT_READ | PROT_WRITE);
DBG(" ... Mapping %x(%x)+%x(%x) len=%x extend=%x", (int)pos0, (int)f->pos, ll, l, (int)F->file_size, (int)F->file_extend);
- if (ll != oll && f->buffer)
+ if (ll != F->window_size && f->buffer)
{
- munmap(f->buffer, oll);
+ munmap(f->buffer, F->window_size);
f->buffer = NULL;
}
+ F->window_size = ll;
if (!f->buffer)
f->buffer = sh_mmap(NULL, ll, prot, MAP_SHARED, F->fd, pos0);
else
DBG(" -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
}
-static void
+static int
bfmm_seek(struct fastbuf *f, sh_off_t pos, int whence)
{
if (whence == SEEK_END)
ASSERT(whence == SEEK_SET);
ASSERT(pos >= 0 && pos <= FB_MMAP(f)->file_size);
f->pos = pos;
- f->bptr = f->bstop = f->bufend; /* force refill/spout call */
+ f->bptr = f->bstop = f->bufend = f->buffer; /* force refill/spout call */
DBG("Seek -> %p %p %p(%x) %p", f->buffer, f->bptr, f->bstop, (int)f->pos, f->bufend);
+ return 1;
}
static void
struct fb_mmap *F = FB_MMAP(f);
if (f->buffer)
- munmap(f->buffer, ALIGN_TO(f->bufend-f->buffer, CPU_PAGE_SIZE));
+ munmap(f->buffer, F->window_size);
if (F->file_extend > F->file_size &&
sh_ftruncate(F->fd, F->file_size))
die("ftruncate(%s): %m", f->name);
}
}
-static struct fastbuf *
+struct fastbuf *
bfmmopen_internal(int fd, byte *name, uns mode)
{
int namelen = strlen(name) + 1;
return f;
}
-struct fastbuf *
-bopen_mm(byte *name, uns mode)
-{
- int fd;
-
- if ((mode & O_ACCMODE) == O_WRONLY)
- mode = (mode & ~O_ACCMODE) | O_RDWR;
- fd = sh_open(name, mode, 0666);
- if (fd < 0)
- die("Unable to %s file %s: %m",
- (mode & O_CREAT) ? "create" : "open", name);
- return bfmmopen_internal(fd, name, mode);
-}
-
#ifdef TEST
int main(int argc, char **argv)