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/** * This file provides common operations on Uint8Arrays. * It should not use any Buffers to do so. * Any function that uses Buffer should be in buffers.ts. * This helps us avoid bringing in the heavy polyfill for Buffer * when bundling for the browser. */
import { rfc4648 } from "../../deps.ts";
const decoder: TextDecoder = new TextDecoder();const encoder: TextEncoder = new TextEncoder();
//--------------------------------------------------
export function bytesToString(bytes: Uint8Array): string {  return decoder.decode(bytes);}
export function stringToBytes(str: string): Uint8Array {  return encoder.encode(str);}
//--------------------------------------------------
export function stringLengthInBytes(str: string): number {  // TODO: is there a more efficient way to do this?  // If we had a Buffer we could just do Buffer.byteLength(str, 'utf-8');  return stringToBytes(str).length;}
export function concatBytes(a: Uint8Array, b: Uint8Array): Uint8Array {  // Checks for truthy values or empty arrays on each argument  // to avoid the unnecessary construction of a new array and  // the type comparison  if (!b || b.length === 0) return a;  if (!a || a.length === 0) return b;
  var c = new Uint8Array(a.length + b.length);  c.set(a);  c.set(b, a.length);
  return c;}
//--------------------------------------------------
export function b64StringToBytes(b64string: string): Uint8Array {  return rfc4648.base64.parse(b64string);}
//--------------------------------------------------
export function isBytes(bytes: any): bytes is Uint8Array {  return bytes?.constructor?.name === "Uint8Array";  //return bytes.writeUInt8 === undefined && bytes instanceof Uint8Array;}
export function isBuffer(buf: any): boolean {  // do this without any official reference to Buffer  // to avoid bringing in the Buffer polyfill  return buf?.constructor?.name === "Buffer";  //buf instanceof Buffer;}
export function identifyBufOrBytes(bufOrBytes: any | Uint8Array): string {  if (isBytes(bufOrBytes)) return "bytes";  if (isBuffer(bufOrBytes)) return "buffer";  return "?";}