123456789101112131415161718192021222324252627282930313233343536373839404142434445
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.import { copy } from "./copy.ts";
/** Returns a new Uint8Array composed of `count` repetitions of the `source` * array. * * If `count` is negative, a `RangeError` is thrown. * * ```ts * import { repeat } from "https://deno.land/std@$STD_VERSION/bytes/repeat.ts"; * const source = new Uint8Array([0, 1, 2]); * console.log(repeat(source, 3)); // [0, 1, 2, 0, 1, 2, 0, 1, 2] * console.log(repeat(source, 0)); // [] * console.log(repeat(source, -1)); // RangeError * ``` */export function repeat(source: Uint8Array, count: number): Uint8Array {  if (count === 0) {    return new Uint8Array();  }
  if (count < 0) {    throw new RangeError("bytes: negative repeat count");  } else if ((source.length * count) / count !== source.length) {    throw new Error("bytes: repeat count causes overflow");  }
  const int = Math.floor(count);
  if (int !== count) {    throw new Error("bytes: repeat count must be an integer");  }
  const nb = new Uint8Array(source.length * count);
  let bp = copy(source, nb);
  for (; bp < nb.length; bp *= 2) {    copy(nb.slice(0, bp), nb, bp);  }
  return nb;}