diff options
Diffstat (limited to 'src/biguint.rs')
| -rw-r--r-- | src/biguint.rs | 71 |
1 files changed, 49 insertions, 22 deletions
diff --git a/src/biguint.rs b/src/biguint.rs index 623823c..1554eb0 100644 --- a/src/biguint.rs +++ b/src/biguint.rs @@ -283,6 +283,9 @@ impl Integer for BigUint { /// Returns `true` if the number is a multiple of `other`. #[inline] fn is_multiple_of(&self, other: &BigUint) -> bool { + if other.is_zero() { + return self.is_zero(); + } (self % other).is_zero() } @@ -501,13 +504,13 @@ impl Roots for BigUint { } } -/// A generic trait for converting a value to a `BigUint`. +/// A generic trait for converting a value to a [`BigUint`]. pub trait ToBigUint { - /// Converts the value of `self` to a `BigUint`. + /// Converts the value of `self` to a [`BigUint`]. fn to_biguint(&self) -> Option<BigUint>; } -/// Creates and initializes a `BigUint`. +/// Creates and initializes a [`BigUint`]. /// /// The digits are in little-endian base matching `BigDigit`. #[inline] @@ -516,7 +519,7 @@ pub(crate) fn biguint_from_vec(digits: Vec<BigDigit>) -> BigUint { } impl BigUint { - /// Creates and initializes a `BigUint`. + /// Creates and initializes a [`BigUint`]. /// /// The base 2<sup>32</sup> digits are ordered least significant digit first. #[inline] @@ -535,7 +538,7 @@ impl BigUint { big } - /// Creates and initializes a `BigUint`. + /// Creates and initializes a [`BigUint`]. /// /// The base 2<sup>32</sup> digits are ordered least significant digit first. #[inline] @@ -545,7 +548,7 @@ impl BigUint { big } - /// Assign a value to a `BigUint`. + /// Assign a value to a [`BigUint`]. /// /// The base 2<sup>32</sup> digits are ordered least significant digit first. #[inline] @@ -561,7 +564,7 @@ impl BigUint { self.normalize(); } - /// Creates and initializes a `BigUint`. + /// Creates and initializes a [`BigUint`]. /// /// The bytes are in big-endian byte order. /// @@ -586,11 +589,11 @@ impl BigUint { } else { let mut v = bytes.to_vec(); v.reverse(); - BigUint::from_bytes_le(&*v) + BigUint::from_bytes_le(&v) } } - /// Creates and initializes a `BigUint`. + /// Creates and initializes a [`BigUint`]. /// /// The bytes are in little-endian byte order. #[inline] @@ -602,7 +605,7 @@ impl BigUint { } } - /// Creates and initializes a `BigUint`. The input slice must contain + /// Creates and initializes a [`BigUint`]. The input slice must contain /// ascii/utf8 characters in [0-9a-zA-Z]. /// `radix` must be in the range `2...36`. /// @@ -624,7 +627,7 @@ impl BigUint { BigUint::from_str_radix(s, radix).ok() } - /// Creates and initializes a `BigUint`. Each u8 of the input slice is + /// Creates and initializes a [`BigUint`]. Each `u8` of the input slice is /// interpreted as one digit of the number /// and must therefore be less than `radix`. /// @@ -644,7 +647,7 @@ impl BigUint { convert::from_radix_be(buf, radix) } - /// Creates and initializes a `BigUint`. Each u8 of the input slice is + /// Creates and initializes a [`BigUint`]. Each `u8` of the input slice is /// interpreted as one digit of the number /// and must therefore be less than `radix`. /// @@ -664,7 +667,7 @@ impl BigUint { convert::from_radix_le(buf, radix) } - /// Returns the byte representation of the `BigUint` in big-endian byte order. + /// Returns the byte representation of the [`BigUint`] in big-endian byte order. /// /// # Examples /// @@ -681,7 +684,7 @@ impl BigUint { v } - /// Returns the byte representation of the `BigUint` in little-endian byte order. + /// Returns the byte representation of the [`BigUint`] in little-endian byte order. /// /// # Examples /// @@ -700,7 +703,7 @@ impl BigUint { } } - /// Returns the `u32` digits representation of the `BigUint` ordered least significant digit + /// Returns the `u32` digits representation of the [`BigUint`] ordered least significant digit /// first. /// /// # Examples @@ -718,7 +721,7 @@ impl BigUint { self.iter_u32_digits().collect() } - /// Returns the `u64` digits representation of the `BigUint` ordered least significant digit + /// Returns the `u64` digits representation of the [`BigUint`] ordered least significant digit /// first. /// /// # Examples @@ -737,7 +740,7 @@ impl BigUint { self.iter_u64_digits().collect() } - /// Returns an iterator of `u32` digits representation of the `BigUint` ordered least + /// Returns an iterator of `u32` digits representation of the [`BigUint`] ordered least /// significant digit first. /// /// # Examples @@ -755,7 +758,7 @@ impl BigUint { U32Digits::new(self.data.as_slice()) } - /// Returns an iterator of `u64` digits representation of the `BigUint` ordered least + /// Returns an iterator of `u64` digits representation of the [`BigUint`] ordered least /// significant digit first. /// /// # Examples @@ -794,7 +797,7 @@ impl BigUint { /// Returns the integer in the requested base in big-endian digit order. /// The output is not given in a human readable alphabet but as a zero - /// based u8 number. + /// based `u8` number. /// `radix` must be in the range `2...256`. /// /// # Examples @@ -832,7 +835,7 @@ impl BigUint { convert::to_radix_le(self, radix) } - /// Determines the fewest bits necessary to express the `BigUint`. + /// Determines the fewest bits necessary to express the [`BigUint`]. #[inline] pub fn bits(&self) -> u64 { if self.is_zero() { @@ -855,7 +858,7 @@ impl BigUint { } } - /// Returns a normalized `BigUint`. + /// Returns a normalized [`BigUint`]. #[inline] fn normalized(mut self) -> BigUint { self.normalize(); @@ -956,6 +959,30 @@ impl BigUint { } } +impl num_traits::FromBytes for BigUint { + type Bytes = [u8]; + + fn from_be_bytes(bytes: &Self::Bytes) -> Self { + Self::from_bytes_be(bytes) + } + + fn from_le_bytes(bytes: &Self::Bytes) -> Self { + Self::from_bytes_le(bytes) + } +} + +impl num_traits::ToBytes for BigUint { + type Bytes = Vec<u8>; + + fn to_be_bytes(&self) -> Self::Bytes { + self.to_bytes_be() + } + + fn to_le_bytes(&self) -> Self::Bytes { + self.to_bytes_le() + } +} + pub(crate) trait IntDigits { fn digits(&self) -> &[BigDigit]; fn digits_mut(&mut self) -> &mut Vec<BigDigit>; @@ -987,7 +1014,7 @@ impl IntDigits for BigUint { } } -/// Convert a u32 chunk (len is either 1 or 2) to a single u64 digit +/// Convert a `u32` chunk (len is either 1 or 2) to a single `u64` digit #[inline] fn u32_chunk_to_u64(chunk: &[u32]) -> u64 { // raw could have odd length |