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lewis.moe
1use cid::Cid;
2use std::io::Write;
3
4pub fn write_varint<W: Write>(mut writer: W, mut value: u64) -> std::io::Result<()> {
5 loop {
6 let mut byte = (value & 0x7F) as u8;
7 value >>= 7;
8 if value != 0 {
9 byte |= 0x80;
10 }
11 writer.write_all(&[byte])?;
12 if value == 0 {
13 break;
14 }
15 }
16 Ok(())
17}
18
19pub fn ld_write<W: Write>(mut writer: W, data: &[u8]) -> std::io::Result<()> {
20 write_varint(&mut writer, data.len() as u64)?;
21 writer.write_all(data)?;
22 Ok(())
23}
24
25pub fn encode_car_header(root_cid: &Cid) -> Vec<u8> {
26 let header = serde_ipld_dagcbor::to_vec(&serde_json::json!({
27 "version": 1u64,
28 "roots": [root_cid.to_bytes()]
29 }))
30 .unwrap_or_default();
31 header
32}