Function decoded_len

base64ct/src/encoding.rs:349–354

(input_len: usize)

#[allow(clippy::integer_arithmetic)]
#[inline(always)]
pub(crate) fn decoded_len(input_len: usize) -> usize {
    // overflow-proof computation of `(3*n)/4`
    let k = input_len / 4;
    let l = input_len - 4 * k;
    3 * k + (3 * l) / 4
}

/// Branchless match that a given byte is the `PAD` character
// TODO(tarcieri): explicitly checked/wrapped arithmetic