1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import * as path from "../path/mod.ts";
/** * Copy bytes from one Uint8Array to another.  Bytes from `src` which don't fit * into `dst` will not be copied. * * @param src Source byte array * @param dst Destination byte array * @param off Offset into `dst` at which to begin writing values from `src`. * @return number of bytes copied */export function copyBytes(src: Uint8Array, dst: Uint8Array, off = 0): number {  off = Math.max(0, Math.min(off, dst.byteLength));  const dstBytesAvailable = dst.byteLength - off;  if (src.byteLength > dstBytesAvailable) {    src = src.subarray(0, dstBytesAvailable);  }  dst.set(src, off);  return src.byteLength;}
export function charCode(s: string): number {  return s.charCodeAt(0);}
/** 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: Deno.File; filepath: string }> {  const r = Math.floor(Math.random() * 1000000);  const filepath = path.resolve(    `${dir}/${opts.prefix || ""}${r}${opts.postfix || ""}`  );  await Deno.mkdir(path.dirname(filepath), { recursive: true });  const file = await Deno.open(filepath, {    create: true,    read: true,    write: true,    append: true,  });  return { file, filepath };}