bookdata/parsing/
bindata.rs

1//! Decoders for binary data types.
2use std::array::TryFromSliceError;
3
4use hex;
5use thiserror::Error;
6
7/// Error type for hex decoding operations.
8#[derive(Error, Debug)]
9pub enum HexDecodeError {
10    #[error("could not decode hex data")]
11    Decode(#[from] hex::FromHexError),
12    #[error("decoded data incorrect size")]
13    Split(#[from] TryFromSliceError),
14}
15
16/// Decode a 128-bit hex string into a pair of i64s.
17pub fn decode_hex_i64_pair(data: &str) -> Result<(i64, i64), HexDecodeError> {
18    let data = hex::decode(data)?;
19    let (hi, lo) = data.split_at(8);
20
21    let hi: [u8; 8] = hi.try_into()?;
22    let lo: [u8; 8] = lo.try_into()?;
23
24    let hi = i64::from_be_bytes(hi);
25    let lo = i64::from_be_bytes(lo);
26
27    Ok((hi, lo))
28}
29
30#[test]
31fn test_decode_zero_pair() {
32    let zeros = "00000000000000000000000000000000";
33    let (hi, lo) = decode_hex_i64_pair(zeros).unwrap();
34    assert_eq!(hi, 0);
35    assert_eq!(lo, 0);
36}
37
38#[test]
39fn test_decode_n_pair() {
40    let zeros = "80000000000000000000000000000001";
41    let (hi, lo) = decode_hex_i64_pair(zeros).unwrap();
42    assert_eq!(hi, i64::MIN);
43    assert_eq!(lo, 1);
44}
bookdata/parsing/bindata.rs

bookdata/parsing/
bindata.rs
