1234567891011121314151617181920212223242526272829303132333435363738394041424344454647
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.const { Buffer, mkdir, open } = Deno;type File = Deno.File;type Reader = Deno.Reader;import * as path from "../path/mod.ts";import { encode } from "../encoding/utf8.ts";
// `off` is the offset into `dst` where it will at which to begin writing values// from `src`.// Returns the number of bytes copied.export function copyBytes(dst: Uint8Array, src: Uint8Array, off = 0): number {  off = Math.max(0, Math.min(off, dst.byteLength));  const r = dst.byteLength - off;  if (src.byteLength > r) {    src = src.subarray(0, r);  }  dst.set(src, off);  return src.byteLength;}
export function charCode(s: string): number {  return s.charCodeAt(0);}
export function stringsReader(s: string): Reader {  return new Buffer(encode(s).buffer);}
/** Create or open a temporal file at specified directory with prefix and *  postfix * */export async function tempFile(  dir: string,  opts: {    prefix?: string;    postfix?: string;  } = { prefix: "", postfix: "" }): Promise<{ file: File; filepath: string }> {  const r = Math.floor(Math.random() * 1000000);  const filepath = path.resolve(    `${dir}/${opts.prefix || ""}${r}${opts.postfix || ""}`  );  await mkdir(path.dirname(filepath), { recursive: true });  const file = await open(filepath, "a");  return { file, filepath };}