did-method-plc 0.2.2

did:plc DID method, using the ssi crate
Documentation 
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// https://github.com/spruceid/ssi/blob/main/crates/multicodec/src/lib.rs#L7C1-L59C2
// https://github.com/spruceid/ssi/blob/main/LICENSE

use std::ops::Deref;

pub use unsigned_varint::decode::Error;

/// Multi-encoded byte slice.
pub struct MultiEncoded([u8]);

impl MultiEncoded {
    /// Creates a new multi-encoded slice from the given `bytes`.
    ///
    /// Following the [`unsigned-varint`] specification and to avoid memory
    /// attacks, the coded must be encoded on at most 9 bytes (63 bits unsigned
    /// varint).
    ///
    /// [`unsigned-varint`](https://github.com/multiformats/unsigned-varint)
    #[inline(always)]
    pub fn new(bytes: &[u8]) -> Result<&Self, Error> {
        unsigned_varint::decode::u64(bytes)?;
        Ok(unsafe { std::mem::transmute::<&[u8], &Self>(bytes) })
    }

    /// Creates a new multi-encoded slice from the given `bytes` without
    /// checking the codec.
    ///
    /// # Safety
    ///
    /// Following the [`unsigned-varint`] specification and to avoid memory
    /// attacks, the coded must be encoded on at most 9 bytes (63 bits unsigned
    /// varint).
    ///
    /// [`unsigned-varint`](https://github.com/multiformats/unsigned-varint)
    #[inline(always)]
    #[allow(dead_code)]
    pub unsafe fn new_unchecked(bytes: &[u8]) -> &Self {
        unsafe { std::mem::transmute(bytes) }
    }

    #[inline(always)]
    pub fn parts(&self) -> (u64, &[u8]) {
        unsigned_varint::decode::u64(&self.0).unwrap()
    }

    #[inline(always)]
    pub fn codec(&self) -> u64 {
        self.parts().0
    }

    #[inline(always)]
    pub fn data(&self) -> &[u8] {
        self.parts().1
    }

    /// Returns the raw bytes, including the codec prefix.
    #[inline(always)]
    #[allow(dead_code)]
    pub fn as_bytes(&self) -> &[u8] {
        &self.0
    }
}

pub struct MultiEncodedBuf(Vec<u8>);

impl MultiEncodedBuf {
    /// Creates a new multi-encoded slice from the given `bytes`.
    ///
    /// Following the [`unsigned-varint`] specification and to avoid memory
    /// attacks, the coded must be encoded on at most 9 bytes (63 bits unsigned
    /// varint).
    ///
    /// [`unsigned-varint`](https://github.com/multiformats/unsigned-varint)
    #[inline(always)]
    #[allow(dead_code)]
    pub fn new(bytes: Vec<u8>) -> Result<Self, Error> {
        unsigned_varint::decode::u64(&bytes)?;
        Ok(Self(bytes))
    }

    #[allow(dead_code)]
    pub fn encode(codec: u64, bytes: &[u8]) -> Self {
        let mut codec_buffer = [0u8; 10];
        let encoded_codec = unsigned_varint::encode::u64(codec, &mut codec_buffer);
        let mut result = Vec::with_capacity(encoded_codec.len() + bytes.len());
        result.extend(encoded_codec);
        result.extend(bytes);
        Self(result)
    }

    /// Creates a new multi-encoded slice from the given `bytes` without
    /// checking the codec.
    ///
    /// # Safety
    ///
    /// Following the [`unsigned-varint`] specification and to avoid memory
    /// attacks, the coded must be encoded on at most 9 bytes (63 bits unsigned
    /// varint).
    ///
    /// [`unsigned-varint`](https://github.com/multiformats/unsigned-varint)
    #[inline(always)]
    #[allow(dead_code)]
    pub unsafe fn new_unchecked(bytes: Vec<u8>) -> Self {
        Self(bytes)
    }

    #[inline(always)]
    pub fn as_multi_encoded(&self) -> &MultiEncoded {
        unsafe { MultiEncoded::new_unchecked(&self.0) }
    }

    /// Returns the raw bytes, including the codec prefix.
    #[inline(always)]
    #[allow(dead_code)]
    pub fn into_bytes(self) -> Vec<u8> {
        self.0
    }
}

impl Deref for MultiEncodedBuf {
    type Target = MultiEncoded;

    fn deref(&self) -> &Self::Target {
        self.as_multi_encoded()
    }
}