@kentcdodds/dropbox

/** Decode a base64 string to bytes. Throws if the input is not valid base64. */
export function decodeBase64(value: string): Uint8Array {
	let binary: string
	try {
		binary = atob(value)
	} catch {
		throw new Error('bytesBase64 must be valid base64.')
	}
	const bytes = new Uint8Array(binary.length)
	for (let index = 0; index < binary.length; index += 1) {
		bytes[index] = binary.charCodeAt(index)
	}
	return bytes
}

/** Encode bytes to a base64 string. */
export function encodeBase64(bytes: Uint8Array): string {
	const chunks: string[] = []
	const chunkSize = 0x8000
	for (let index = 0; index < bytes.length; index += chunkSize) {
		chunks.push(String.fromCharCode(...bytes.subarray(index, index + chunkSize)))
	}
	return btoa(chunks.join(''))
}

/** Encode a UTF-8 string to base64. */
export function encodeTextBase64(value: string): string {
	return encodeBase64(new TextEncoder().encode(value))
}