'use strict';

var utilBufferFrom = require('@smithy/util-buffer-from');

const fromUtf8 = (input) => {
    const buf = utilBufferFrom.fromString(input, "utf8");
    return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength / Uint8Array.BYTES_PER_ELEMENT);
};

const toUint8Array = (data) => {
    if (typeof data === "string") {
        return fromUtf8(data);
    }
    if (ArrayBuffer.isView(data)) {
        return new Uint8Array(data.buffer, data.byteOffset, data.byteLength / Uint8Array.BYTES_PER_ELEMENT);
    }
    return new Uint8Array(data);
};

const toUtf8 = (input) => {
    if (typeof input === "string") {
        return input;
    }
    if (typeof input !== "object" || typeof input.byteOffset !== "number" || typeof input.byteLength !== "number") {
        throw new Error("@smithy/util-utf8: toUtf8 encoder function only accepts string | Uint8Array.");
    }
    return utilBufferFrom.fromArrayBuffer(input.buffer, input.byteOffset, input.byteLength).toString("utf8");
};

exports.fromUtf8 = fromUtf8;
exports.toUint8Array = toUint8Array;
exports.toUtf8 = toUtf8;