base64-ng 1.2.1

no_std-first Base64 encoding and decoding with strict APIs and a security-heavy release process
Documentation 
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use crate::{Alphabet, Profile, ct};

/// A zero-sized Base64 engine parameterized by alphabet and padding policy.
pub struct Engine<A, const PAD: bool> {
    alphabet: core::marker::PhantomData<A>,
}

impl<A, const PAD: bool> Clone for Engine<A, PAD> {
    fn clone(&self) -> Self {
        *self
    }
}

impl<A, const PAD: bool> Copy for Engine<A, PAD> {}

impl<A, const PAD: bool> core::fmt::Debug for Engine<A, PAD> {
    fn fmt(&self, formatter: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        formatter
            .debug_struct("Engine")
            .field("padded", &PAD)
            .finish()
    }
}

impl<A, const PAD: bool> core::fmt::Display for Engine<A, PAD> {
    fn fmt(&self, formatter: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        write!(formatter, "padded={PAD}")
    }
}

impl<A, const PAD: bool> Default for Engine<A, PAD> {
    fn default() -> Self {
        Self {
            alphabet: core::marker::PhantomData,
        }
    }
}

impl<A, const PAD: bool> Eq for Engine<A, PAD> {}

impl<A, const PAD: bool> PartialEq for Engine<A, PAD> {
    fn eq(&self, _other: &Self) -> bool {
        true
    }
}

impl<A, const PAD: bool> Engine<A, PAD>
where
    A: Alphabet,
{
    /// Creates a new engine value.
    #[must_use]
    pub const fn new() -> Self {
        Self {
            alphabet: core::marker::PhantomData,
        }
    }

    /// Returns whether this engine uses padded Base64.
    #[must_use]
    pub const fn is_padded(&self) -> bool {
        PAD
    }

    /// Returns this engine as an unwrapped profile.
    ///
    /// Use [`Profile::new`] or [`Profile::checked_new`] when a strict
    /// line-wrapping policy should travel with the profile.
    #[must_use]
    pub const fn profile(&self) -> Profile<A, PAD> {
        Profile::new(*self, None)
    }

    /// Returns the matching constant-time-oriented decoder for this engine's
    /// alphabet and padding policy.
    ///
    /// The returned decoder is still an explicit opt-in to the [`ct`] module's
    /// slower, opaque-error, constant-time-oriented scalar path.
    #[must_use]
    pub const fn ct_decoder(&self) -> ct::CtEngine<A, PAD> {
        ct::CtEngine::new()
    }
}

mod decode;
mod decode_in_place;
mod encode;
mod encode_in_place;
mod stream;
mod validate;