Qusestion: why CIGAR output write result different with CigarString?

[wjwei-handsome]

Hi!

I'm trying to write a bam file using bam::Writer, but when i have set cigar, I found that the bam output's cigar is different with the CigarString I determined:

Here is my CigarString, I print the first Cigar println!("cigar0{:?}", cigar[0]);, it shows:

cigar0HardClip(289573083)

But when I check my bam file, this record shows:

21137627H

And then I simulate a fake bam record like this:

fn main() {
    let mut bamheader = rust_htslib::bam::header::Header::new();
    let mut bamheader_sample_rec = rust_htslib::bam::header::HeaderRecord::new(b"SQ");
    let bamheader_sample_rec = bamheader_sample_rec.push_tag(b"SN", "chr1").push_tag(b"LN", 1000);
    bamheader.push_record(&bamheader_sample_rec);
    let mut std_wtr = BamWriter::from_stdout(&bamheader, Format::Sam).unwrap();
    let mut bamrec = BamRecord::default();
    bamrec.set_pos(1);
    bamrec.set_tid(0);
    bamrec.set_flags(0);
    let seq = b"ATGC";
    let quals = vec![255 as u8; 4];
    let fake_cigar_vec = vec![Cigar::HardClip(289573083)];
    let fake_cigar = CigarString(fake_cigar_vec);
    bamrec.set(b"qname", Some(&fake_cigar), seq, &quals);
    bamrec.set_mapq(255);
    bamrec.set_mpos(0);
    bamrec.set_mtid(-1);
    std_wtr.write(&bamrec).unwrap();
}

And the above code will output this:

@sq SN:chr1 LN:1000
qname 0 chr1 2 255 21137627H * 1 0 ATGC *

So I’m confused about this, why did 289573083 convert to 21137627 ? I want to hear yours advices .

Thanks!