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stream_file: use fstat() instead of lseek() to determine file size

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It appears using lseek() to seek to the end and back to determine file
size is inefficient in some cases (like with CIFS, see #7408).

Even Windows supports fstat() (well, almost, but we already have a
wrapper), so use that. It's unknown whether that will work better.
Although I like it more, because it doesn't mess with the file position.
This commit is contained in:
wm4 2020-02-16 16:03:03 +01:00
parent a19d918816
commit 74a2c0fb7f
1 changed files with 8 additions and 3 deletions
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11
stream/stream_file.c
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@ -77,9 +77,14 @@ static int64_t get_size(stream_t *s)
{
struct priv *p = s->priv;
if (p->cached_size == -2) {
off_t size = lseek(p->fd, 0, SEEK_END);
lseek(p->fd, s->pos, SEEK_SET);
p->cached_size = size < 0 ? -1 : size;
int64_t size = -1;
struct stat st;
if (fstat(p->fd, &st) == 0) {
if (st.st_size <= 0 && !s->seekable)
st.st_size = -1;
size = st.st_size < 0 ? -1 : st.st_size;
}
p->cached_size = size;
}
return p->cached_size;
}