std::str::Utf8Error - Rust (original) (raw)
Struct std::str::Utf8Error1.0.0 [−] [src]
pub struct Utf8Error { /* fields omitted */ }
Errors which can occur when attempting to interpret a sequence of u8as a string.
As such, the from_utf8 family of functions and methods for both Strings and &strs make use of this error, for example.
impl [Utf8Error](../../std/str/struct.Utf8Error.html "struct std::str::Utf8Error")[src]
pub fn [valid_up_to](#method.valid%5Fup%5Fto)(&self) -> [usize](../primitive.usize.html)
1.5.0
Returns the index in the given string up to which valid UTF-8 was verified.
It is the maximum index such that from_utf8(&input[..index])would return Ok(_).
Basic usage:
use std::str;
let sparkle_heart = vec![0, 159, 146, 150];
let error = str::from_utf8(&sparkle_heart).unwrap_err();
assert_eq!(1, error.valid_up_to());Run
pub fn [error_len](#method.error%5Flen)(&self) -> [Option](../../std/option/enum.Option.html "enum std::option::Option")<[usize](../primitive.usize.html)>
1.20.0
Provide more information about the failure:
None: the end of the input was reached unexpectedly.self.valid_up_to()is 1 to 3 bytes from the end of the input. If a byte stream (such as a file or a network socket) is being decoded incrementally, this could be a validcharwhose UTF-8 byte sequence is spanning multiple chunks.Some(len): an unexpected byte was encountered. The length provided is that of the invalid byte sequence that starts at the index given byvalid_up_to(). Decoding should resume after that sequence (after inserting a U+FFFD REPLACEMENT CHARACTER) in case of lossy decoding.