sqlite-hashes 0.10.8

Hashing functions for SQLite with aggregation support: MD5, SHA1, SHA256, SHA512, Blake3, FNV-1a, xxHash
Documentation 
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use digest::Digest;
#[cfg(feature = "hex")]
use hex::ToHex as _;

#[derive(Debug, Default)]
pub enum HashState<T> {
    #[default]
    Created,
    Started,
    HasValues(T),
}

impl<T: Digest + Clone> HashState<T> {
    #[inline]
    pub fn add_null(&mut self) {
        if let Self::Created = self {
            *self = Self::Started;
        }
    }

    #[inline]
    pub fn add_value(&mut self, value: &[u8]) {
        match self {
            Self::Created | Self::Started => {
                let mut hasher = T::new();
                hasher.update(value);
                *self = Self::HasValues(hasher);
            }
            Self::HasValues(hasher) => {
                hasher.update(value);
            }
        }
    }

    #[inline]
    pub fn finalize(self) -> Option<Vec<u8>> {
        match self {
            Self::Created | Self::Started => None,
            Self::HasValues(hasher) => Some(hasher.finalize().to_vec()),
        }
    }

    #[inline]
    #[cfg(feature = "hex")]
    pub fn finalize_hex(self) -> Option<String> {
        match self {
            Self::Created => None,
            Self::Started => Some(String::new()),
            Self::HasValues(hasher) => Some(hasher.finalize().to_vec().encode_hex_upper()),
        }
    }
}