pub fn decode_data(base: &[u8]) -> crate::Result<Vec<u8>> {
        // find and remove padding.
        let (padded, base) = match base.iter().rev().take_while(|b| **b == Self::PADDING).count() {
            _ if base.len() % 4 != 0 => return Err(crate::Error::Base64Error),
            padded if padded > 2 => return Err(crate::Error::Base64Error),
            padded => (padded, &base[..base.len() - padded]),
        };

        // decode the data.
        let mut data = Vec::new();
        for chunk in base.chunks(4) {
            let num: usize = [18usize, 12, 6, 0]
                .iter()
                .zip(chunk.iter())
                .try_fold(0, |acc, (s, b)| Self::decode_byte(*b).map(|b| acc + (b << *s)))?;
            [16, 8, 0].iter().map(|s| (num >> s) as u8).for_each(|b| data.push(b));
        }

        // remove any trailing padding related zeroes
        data.truncate(data.len() - padded);
        Ok(data)
    }
/// decode data from base64 based off of the URI safe character set
decode data from base64 based off of the URI safe character set
decode data from base64 based off of the URI safe character set
pub fn decode_data(base: &[u8]) -> crate::Result<Vec<u8>> {
        // find and remove padding.
        let (padded, base) = match base.iter().rev().take_while(|b| **b == Self::PADDING).count() {
            _ if base.len() % 4 != 0 => return Err(crate::Error::Base64Error),
            padded if padded > 2 => return Err(crate::Error::Base64Error),
            padded => (padded, &base[..base.len() - padded]),
        };
        // decode the data.
        let mut data = Vec::new();
        for chunk in base.chunks(4) {
            let num: usize = [18usize, 12, 6, 0]
                .iter()
                .zip(chunk.iter())
                .try_fold(0, |acc, (s, b)| Self::decode_byte(*b).map(|b| acc + (b << *s)))?;
            [16, 8, 0].iter().map(|s| (num >> s) as u8).for_each(|b| data.push(b));
        }
        // remove any trailing padding related zeroes
        data.truncate(data.len() - padded);
        Ok(data)
    }
pub fn decode_data ( base : & [ u8 ] ) -> crate :: Result < Vec < u8 > > { // find and remove padding. let ( padded , base ) = match base . iter ( ) . rev ( ) . take_while ( | b | * * b == Self :: PADDING ) . count ( ) { _ if base . len ( ) % 4 != 0 => return Err ( crate :: Error :: Base64Error ) , padded if padded > 2 => return Err ( crate :: Error :: Base64Error ) , padded => ( padded , & base [ .. base . len ( ) - padded ] ) , } ; // decode the data. let mut data = Vec :: new ( ) ; for chunk in base . chunks ( 4 ) { let num : usize = [ 18usize , 12 , 6 , 0 ] . iter ( ) . zip ( chunk . iter ( ) ) . try_fold ( 0 , | acc , ( s , b ) | Self :: decode_byte ( * b ) . map ( | b | acc + ( b << * s ) ) ) ? ; [ 16 , 8 , 0 ] . iter ( ) . map ( | s | ( num >> s ) as u8 ) . for_each ( | b | data . push ( b ) ) ; } // remove any trailing padding related zeroes data . truncate ( data . len ( ) - padded ) ; Ok ( data ) }
decode data from base64 based off of the URI safe character set
decode data from base64 based off of the URI safe character set
base
&[u8]