@iota/bcs/src/b64.ts

BCS - Canonical Binary Serialization implementation for JavaScript

// Copyright (c) Mysten Labs, Inc.
// Modifications Copyright (c) 2024 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

export function fromBase64(base64String: string): Uint8Array {
    return Uint8Array.from(atob(base64String), (char) => char.charCodeAt(0));
}

const CHUNK_SIZE = 8192;
export function toBase64(bytes: Uint8Array): string {
    // Special-case the simple case for speed's sake.
    if (bytes.length < CHUNK_SIZE) {
        return btoa(String.fromCharCode(...bytes));
    }

    let output = '';
    for (let i = 0; i < bytes.length; i += CHUNK_SIZE) {
        const chunk = bytes.slice(i, i + CHUNK_SIZE);
        output += String.fromCharCode(...chunk);
    }

    return btoa(output);
}

/** @deprecated use toBase64 instead */
export const toB64 = toBase64;

/** @deprecated use fromBase64 instead */
export const fromB64 = fromBase64;