static off_t
bzf_seek(struct open_file *f, off_t offset, int where)
{
struct bz_file *bzf = (struct bz_file *)f->f_fsdata;
off_t target;
char discard[16];
switch (where) {
case SEEK_SET:
target = offset;
break;
case SEEK_CUR:
target = offset + bzf->bzf_bzstream.total_out_lo32;
break;
default:
target = -1;
}
/* Can we get there from here? */
if (target < bzf->bzf_bzstream.total_out_lo32) {
errno = EOFFSET;
return -1;
}
/* skip forwards if required */
while (target > bzf->bzf_bzstream.total_out_lo32) {
if (bzf_read(f, discard, min(sizeof(discard), target - bzf->bzf_bzstream.total_out_lo32), NULL) == -1)
return(-1);
}
/* This is where we are (be honest if we overshot) */
return (bzf->bzf_bzstream.total_out_lo32);
}
/* Small test case, open and decompress test.bz2 */
int main()
{
struct open_file f;
char buf[1024];
size_t resid;
int err;
memset(&f, '\0', sizeof(f));
f.f_flags = F_READ;
err = bzf_open("test", &f);
if (err != 0)
exit(1);
do {
err = bzf_read(&f, buf, sizeof(buf), &resid);
} while (err == 0 && resid != sizeof(buf));
if (err != 0)
exit(2);
exit(0);
}
