int stream_blob_to_fd(int fd, unsigned const char *sha1, struct stream_filter *filter,
int can_seek)
{
struct git_istream *st;
enum object_type type;
unsigned long sz;
ssize_t kept = 0;
int result = -1;
st = open_istream(sha1, &type, &sz, filter);
if (!st) {
if (filter)
free_stream_filter(filter);
return result;
}
if (type != OBJ_BLOB)
goto close_and_exit;
for (;;) {
char buf[1024 * 16];
ssize_t wrote, holeto;
ssize_t readlen = read_istream(st, buf, sizeof(buf));
if (readlen < 0)
goto close_and_exit;
if (!readlen)
break;
if (can_seek && sizeof(buf) == readlen) {
for (holeto = 0; holeto < readlen; holeto++)
if (buf[holeto])
break;
if (readlen == holeto) {
kept += holeto;
continue;
}
}
if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1)
goto close_and_exit;
else
kept = 0;
wrote = write_in_full(fd, buf, readlen);
if (wrote != readlen)
goto close_and_exit;
}
if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 ||
xwrite(fd, "", 1) != 1))
goto close_and_exit;
result = 0;
close_and_exit:
close_istream(st);
return result;
}
static close_method_decl(filtered)
{
free_stream_filter(st->u.filtered.filter);
return close_istream(st->u.filtered.upstream);
}
