reallyme-codec-base64url 0.2.2

Base64url codec utilities for ReallyMe Codec.
Documentation 
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// SPDX-FileCopyrightText: Copyright © 2026 ReallyMe LLC. All rights reserved
//
// SPDX-License-Identifier: Apache-2.0

use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine as _};

use crate::Base64UrlError;

/// Decode RFC 4648 section 5 Base64URL without padding.
pub fn base64url_to_bytes(s: &str) -> Result<Vec<u8>, Base64UrlError> {
    base64url_bytes_to_bytes(s.as_bytes())
}

/// Decode RFC 4648 section 5 Base64URL bytes without padding.
///
/// This is useful for compact JWT/JWS/JWE segments that have already been
/// split as bytes. It avoids requiring callers to first prove UTF-8 just to
/// decode an ASCII Base64URL alphabet.
pub fn base64url_bytes_to_bytes(bytes: &[u8]) -> Result<Vec<u8>, Base64UrlError> {
    URL_SAFE_NO_PAD
        .decode(bytes)
        .map_err(|_| Base64UrlError::Invalid)
}