app/lib/bytes.mjs

Functions

Imports

It imports no other module of this repo. Imported by app/lib/bearer.server.ts, app/lib/content/hashes.mjs, app/lib/content/og-card-text.mjs, app/lib/cv/pdf-html.mjs, app/lib/editor/github.server.ts, app/lib/media/classify.mjs, app/lib/media/core.server.ts, app/lib/operator/upload-media.server.ts, app/lib/preview-token.mjs, app/lib/search/ask-guard.server.ts.

Source

1// Byte and hash encodings shared by the Worker, the build scripts and node tests. No imports and no
2// Buffer: Buffer does not exist in the Worker runtime unless nodejs_compat is on.
3
4/**
5 * @param {ArrayBuffer | Uint8Array} bytes
6 * @returns {string} lowercase hex, two digits a byte
7 */
8export function toHex(bytes) {
9  return [...new Uint8Array(bytes)].map((b) => b.toString(16).padStart(2, "0")).join("");
10}
11
12/**
13 * FNV-1a, 32 bits, over UTF-16 code units: a short stable fingerprint, not a security boundary.
14 *
15 * @param {string} input
16 * @returns {string} eight lowercase hex digits
17 */
18export function fnv1a32(input) {
19  let hash = 0x811c9dc5;
20  for (let i = 0; i < input.length; i += 1) {
21    hash ^= input.charCodeAt(i);
22    hash = Math.imul(hash, 0x01000193) >>> 0;
23  }
24  return hash.toString(16).padStart(8, "0");
25}
26
27/**
28 * Whitespace is dropped first: GitHub wraps base64 content in lines, chats and YAML add more, and
29 * `atob` throws on it. Anything else that is not base64 throws.
30 *
31 * @param {string} value
32 * @returns {Uint8Array}
33 */
34export function base64ToBytes(value) {
35  return Uint8Array.from(atob(value.replace(/\s+/g, "")), (c) => c.charCodeAt(0));
36}
37
38/**
39 * @param {Uint8Array} bytes
40 * @returns {string} standard base64, padded
41 */
42export function bytesToBase64(bytes) {
43  let binary = "";
44  for (const byte of bytes) binary += String.fromCharCode(byte);
45  return btoa(binary);
46}