decodedLen

Returns the maximum possible decoded size for a given input length - The actual length may be less if the input includes padding. InvalidPadding is returned if the input length is not valid.

Function parameters

Parameters

b64_len:usize
variant:Variant

(best-effort) constant time hexadecimal encoding and decoding.

Types

hex: (best-effort) constant time hexadecimal encoding and decoding.
base64: (best-effort) constant time base64 encoding and decoding.

Error sets in this namespace

Error Sets

Error

Source

Implementation

pub fn decodedLen(b64_len: usize, variant: Variant) !usize {
    var result = b64_len / 4 * 3;
    const leftover = b64_len % 4;
    if (variant.padding) {
        if (leftover % 4 != 0) return error.InvalidPadding;
    } else {
        if (leftover % 4 == 1) return error.InvalidPadding;
        result += leftover * 3 / 4;
    }
    return result;
}