pub(crate) fn validate_digest_str(s: &str) -> Result<(), DigestParseError> {
        let mut parts = s.split(':');

        let algorithm = parts
            .next()
            .ok_or(DigestParseError::InvalidFormat)?
            .parse::<AlgorithmKind>()
            .map_err(|_| DigestParseError::Unsupported)?;
        let digest_str = parts.next().ok_or(DigestParseError::InvalidFormat)?;

        /// Matches against [a-zA-Z0-9=_-]+
        fn valid_encoded(s: &str) -> bool {
            // avoid pulling in the whole regex crate for such a simple check
            s.chars().all(|c| match c {
                'a'..='z' | 'A'..='Z' | '0'..='9' | '=' | '_' | '-' => true,
                _ => false,
            }) && !s.is_empty()
        }

        if !valid_encoded(digest_str) {
            return Err(DigestParseError::InvalidFormat);
        }

        // fine-grained checks for individual algorithms
        use AlgorithmKind::*;
        match algorithm {
            Sha256 | Sha384 | Sha512 => {
                // Note that [A-F] MUST NOT be used here
                if !digest_str.chars().all(|c| match c {
                    'a'..='f' | '0'..='9' => true,
                    _ => false,
                }) {
                    return Err(DigestParseError::InvalidFormat);
                }

                let expect_len = match algorithm {
                    Sha256 => 256,
                    Sha384 => 384,
                    Sha512 => 512,
                    _ => unreachable!(),
                };

                if digest_str.len() != expect_len / 8 * 2 {
                    return Err(DigestParseError::InvalidLength);
                }
            }
            // unspecified algorithm
            Unregistered(_) => {}
        };

        Ok(())
    }
/// Check if the given string matches the digest grammar, _without_ creating
/// a new validator.
///
/// The top-level grammar is copied below, through individual algorithms may
/// impose additional constraints on the `encoded` component of the grammar.
///
/// ```ignore
/// digest                ::= algorithm ":" encoded
/// algorithm             ::= algorithm-component (algorithm-separator algorithm-component)*
/// algorithm-component   ::= [a-z0-9]+
/// algorithm-separator   ::= [+._-]
/// encoded               ::= [a-zA-Z0-9=_-]+
/// ```
Check if the given string matches the digest grammar, _without_ creating
a new validator.

The top-level grammar is copied below, through individual algorithms may
impose additional constraints on the `encoded` component of the grammar.


Check if the given string matches the digest grammar _without_ creating a new validator . The top - level grammar is copied below through individual algorithms may impose additional constraints on the ` encoded ` component of the grammar .
pub(crate) fn validate_digest_str(s: &str) -> Result<(), DigestParseError> {
        let mut parts = s.split(':');
        let algorithm = parts
            .next()
            .ok_or(DigestParseError::InvalidFormat)?
            .parse::<AlgorithmKind>()
            .map_err(|_| DigestParseError::Unsupported)?;
        let digest_str = parts.next().ok_or(DigestParseError::InvalidFormat)?;
        /// Matches against [a-zA-Z0-9=_-]+
        fn valid_encoded(s: &str) -> bool {
            // avoid pulling in the whole regex crate for such a simple check
            s.chars().all(|c| match c {
                'a'..='z' | 'A'..='Z' | '0'..='9' | '=' | '_' | '-' => true,
                _ => false,
            }) && !s.is_empty()
        }
        if !valid_encoded(digest_str) {
            return Err(DigestParseError::InvalidFormat);
        }
        // fine-grained checks for individual algorithms
        use AlgorithmKind::*;
        match algorithm {
            Sha256 | Sha384 | Sha512 => {
                // Note that [A-F] MUST NOT be used here
                if !digest_str.chars().all(|c| match c {
                    'a'..='f' | '0'..='9' => true,
                    _ => false,
                }) {
                    return Err(DigestParseError::InvalidFormat);
                }
                let expect_len = match algorithm {
                    Sha256 => 256,
                    Sha384 => 384,
                    Sha512 => 512,
                    _ => unreachable!(),
                };
                if digest_str.len() != expect_len / 8 * 2 {
                    return Err(DigestParseError::InvalidLength);
                }
            }
            // unspecified algorithm
            Unregistered(_) => {}
        };
        Ok(())
    }
pub ( crate ) fn validate_digest_str ( s : & str ) -> Result < ( ) , DigestParseError > { let mut parts = s . split ( ':' ) ; let algorithm = parts . next ( ) . ok_or ( DigestParseError :: InvalidFormat ) ? . parse :: < AlgorithmKind > ( ) . map_err ( | _ | DigestParseError :: Unsupported ) ? ; let digest_str = parts . next ( ) . ok_or ( DigestParseError :: InvalidFormat ) ? ; /// Matches against [a-zA-Z0-9=_-]+ fn valid_encoded ( s : & str ) -> bool { // avoid pulling in the whole regex crate for such a simple check s . chars ( ) . all ( | c | match c { 'a' ..= 'z' | 'A' ..= 'Z' | '0' ..= '9' | '=' | '_' | '-' => true , _ => false , } ) && ! s . is_empty ( ) } if ! valid_encoded ( digest_str ) { return Err ( DigestParseError :: InvalidFormat ) ; } // fine-grained checks for individual algorithms use AlgorithmKind :: * ; match algorithm { Sha256 | Sha384 | Sha512 => { // Note that [A-F] MUST NOT be used here if ! digest_str . chars ( ) . all ( | c | match c { 'a' ..= 'f' | '0' ..= '9' => true , _ => false , } ) { return Err ( DigestParseError :: InvalidFormat ) ; } let expect_len = match algorithm { Sha256 => 256 , Sha384 => 384 , Sha512 => 512 , _ => unreachable ! ( ) , } ; if digest_str . len ( ) != expect_len / 8 * 2 { return Err ( DigestParseError :: InvalidLength ) ; } } // unspecified algorithm Unregistered ( _ ) => { } } ; Ok ( ( ) ) }
Check if the given string matches the digest grammar, _without_ creating
a new validator.
Check if the given string matches the digest grammar _without_ creating a new validator .
s
&str
s
&str