| // Copyright 2018 Brian Smith. |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| //! Serialization and deserialization. |
| |
| /// A serialized positive integer. |
| #[derive(Copy, Clone)] |
| pub struct Positive<'a>(untrusted::Input<'a>); |
| |
| impl<'a> Positive<'a> { |
| #[inline] |
| pub(crate) fn new_non_empty_without_leading_zeros(input: untrusted::Input<'a>) -> Self { |
| debug_assert!(!input.is_empty()); |
| debug_assert!(input.len() == 1 || input.as_slice_less_safe()[0] != 0); |
| Self(input) |
| } |
| |
| /// Returns the value, ordered from significant byte to least significant |
| /// byte, without any leading zeros. The result is guaranteed to be |
| /// non-empty. |
| #[inline] |
| pub fn big_endian_without_leading_zero(&self) -> &'a [u8] { |
| self.big_endian_without_leading_zero_as_input() |
| .as_slice_less_safe() |
| } |
| |
| #[inline] |
| pub(crate) fn big_endian_without_leading_zero_as_input(&self) -> untrusted::Input<'a> { |
| self.0 |
| } |
| } |
| |
| impl Positive<'_> { |
| /// Returns the first byte. |
| /// |
| /// Will not panic because the value is guaranteed to have at least one |
| /// byte. |
| pub fn first_byte(&self) -> u8 { |
| // This won't panic because |
| self.0.as_slice_less_safe()[0] |
| } |
| } |