Function decode_seq_len

avro/src/decode.rs:56–69

Decode the length of a sequence. Maps and arrays are 0-terminated, 0i64 is also encoded as 0 in Avro reading a length of 0 means the end of the map or array.

(reader: &mut R)

/// the end of the map or array.
fn decode_seq_len<R: Read>(reader: &mut R) -> AvroResult<usize> {
    let raw_len = zag_i64(reader)?;
    safe_len(
        usize::try_from(match raw_len.cmp(&0) {
            std::cmp::Ordering::Equal => return Ok(0),
            std::cmp::Ordering::Less => {
                let _size = zag_i64(reader)?;
                raw_len.checked_neg().ok_or(Details::IntegerOverflow)?
            }
            std::cmp::Ordering::Greater => raw_len,
        })
        .map_err(|e| Details::ConvertI64ToUsize(e, raw_len))?,
    )
}

/// Per-datum decoding state.
///
/// Tracks the cumulative number of bytes allocated on behalf of a single