diff options
Diffstat (limited to 'src/passwordmaker/base_conversion/mod.rs')
| -rw-r--r-- | src/passwordmaker/base_conversion/mod.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/passwordmaker/base_conversion/mod.rs b/src/passwordmaker/base_conversion/mod.rs new file mode 100644 index 0000000..705917a --- /dev/null +++ b/src/passwordmaker/base_conversion/mod.rs @@ -0,0 +1,65 @@ +use std::convert::TryInto; + +use self::remainders::CalcRemainders; + +mod remainders; +mod remainders_impl; + +/// Converts an input to a different base (which fits in usize). Returns the digits starting at the most significant one. +pub(super) trait BaseConversion { + // return type is subject to change. Hopefully soon the math will be rewritten, so we can skip the Vec and IntoIter. + // will have to remain an ExactSizeIterator though. + fn convert_to_base(self, base : usize) -> std::iter::Rev<std::vec::IntoIter<usize>>; +} + +impl<const N : usize, T> BaseConversion for T where T : ToI32Array<Output = [u32;N]>{ + fn convert_to_base(self, base : usize) -> std::iter::Rev<std::vec::IntoIter<usize>> { + self.to_int_array().calc_remainders(base).collect::<Vec<_>>().into_iter().rev() + } +} + +impl BaseConversion for [u8;16]{ + fn convert_to_base(self, base : usize) -> std::iter::Rev<std::vec::IntoIter<usize>> { + u128::from_be_bytes(self).calc_remainders(base as u128).map(|ll| ll as usize).collect::<Vec<_>>().into_iter().rev() + } +} + + + +// Rust 1.52 only has a very limited support for const generics. This means, we'll have to live with this not-too-constrained solution... +// Well, it's private, so no big loss. +trait ToI32Array { + type Output; + fn to_int_array(self) -> Self::Output; +} + +//this could of course be done in a generic manner, but it's ugly without array_mut, which we don't have in Rust 1.52. +//Soo, pedestrian's approach :D +impl ToI32Array for [u8;20] { + type Output = [u32; 5]; + fn to_int_array(self) -> [u32; 5] { + [ + u32::from_be_bytes(self[0..4].try_into().unwrap()), + u32::from_be_bytes(self[4..8].try_into().unwrap()), + u32::from_be_bytes(self[8..12].try_into().unwrap()), + u32::from_be_bytes(self[12..16].try_into().unwrap()), + u32::from_be_bytes(self[16..20].try_into().unwrap()), + ] + } +} + +impl ToI32Array for [u8;32] { + type Output = [u32; 8]; + fn to_int_array(self) -> [u32; 8] { + [ + u32::from_be_bytes(self[0..4].try_into().unwrap()), + u32::from_be_bytes(self[4..8].try_into().unwrap()), + u32::from_be_bytes(self[8..12].try_into().unwrap()), + u32::from_be_bytes(self[12..16].try_into().unwrap()), + u32::from_be_bytes(self[16..20].try_into().unwrap()), + u32::from_be_bytes(self[20..24].try_into().unwrap()), + u32::from_be_bytes(self[24..28].try_into().unwrap()), + u32::from_be_bytes(self[28..32].try_into().unwrap()), + ] + } +}
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