Function read_len

src/models/serializer/mod.rs:43–58

Decode a 1–3 byte varint back to `u32`. Any bits beyond 22 are ignored.

(bufman: &BufferManager, cursor: u64)

/// Decode a 1–3 byte varint back to `u32`. Any bits beyond 22 are ignored.
pub fn read_len(bufman: &BufferManager, cursor: u64) -> Result<u32, BufIoError> {
    let b0 = bufman.read_u8_with_cursor(cursor)? as u32;
    if b0 & 0x80 == 0 {
        return Ok(b0);
    }

    let b1 = bufman.read_u8_with_cursor(cursor)? as u32;
    let low14 = (b0 & 0x7F) | ((b1 & 0x7F) << 7);
    if b1 & 0x80 == 0 {
        return Ok(low14);
    }

    let b2 = bufman.read_u8_with_cursor(cursor)? as u32;
    // here we take all 8 bits of b2 as the highest part
    Ok(low14 | (b2 << 14))
}

pub fn read_string(bufman: &BufferManager, cursor: u64) -> Result<String, BufIoError> {
    let len = read_len(bufman, cursor)? as usize;