Function nix_compat::wire::read_bytes

source · 
pub async fn read_bytes<R>(
    r: &mut R,
    allowed_size: RangeInclusive<usize>,
) -> Result<Vec<u8>>
where
    R: AsyncReadExt + Unpin + ?Sized,
Expand description

Read a “bytes wire packet” from the AsyncRead. Rejects reading more than allowed_size bytes of payload.

The packet is made up of three parts:

  • a length header, u64, LE-encoded
  • the payload itself
  • null bytes to the next 8 byte boundary

Ensures the payload size fits into the allowed_size passed, and that the padding is actual null bytes.

On success, the returned Vec<u8> only contains the payload itself. On failure (for example if a too large byte packet was sent), the reader becomes unusable.

This buffers the entire payload into memory, a streaming version is available at crate::wire::bytes::BytesReader.