pub fn write_varint(value: u64, out: &mut [u8]) -> Result<usize, VarintError>Expand description
Writes value into the front of out in its shortest QUIC varint form,
and reports how many bytes it took.
The Vec-appending form below delegates to this one. A caller with a fixed
buffer — a send path building a preamble it will right-align against an
already-encoded header — allocates nothing (B-250).
§Errors
VarintError::OutOfRange above 2^62 − 1, and when out is shorter than
the form value needs.