Function bao::decode::parse_and_check_content_len

pub fn parse_and_check_content_len(encoded: &[u8]) -> Result<usize, Error>

Parse the length of an encoded slice and convert it to a usize. This is useful if you need to allocate space for decoding.

If the encoded slice isn't long enough to represent the reported length -- which includes the case where the length can't fit in a usize -- this returns Error::Truncated.

Example

let input = b"foobar";
let (_, encoded) = bao::encode::encode_to_vec(input);
let content_len = bao::decode::parse_and_check_content_len(&encoded).unwrap();
assert_eq!(input.len(), content_len);

let err = bao::decode::parse_and_check_content_len(&encoded[..encoded.len()/2]).unwrap_err();
assert_eq!(bao::decode::Error::Truncated, err);