| 1 | const encoder = new TextEncoder(); |
| 2 | const decoder = new TextDecoder(); |
| 3 | |
| 4 | export const utf8 = (s: string): Uint8Array => encoder.encode(s); |
| 5 | export const fromUtf8 = (b: Uint8Array): string => decoder.decode(b); |
| 6 | |
| 7 | export function concat(parts: readonly Uint8Array[]): Uint8Array { |
| 8 | let len = 0; |
| 9 | for (const p of parts) len += p.length; |
| 10 | const out = new Uint8Array(len); |
| 11 | let off = 0; |
| 12 | for (const p of parts) { |
| 13 | out.set(p, off); |
| 14 | off += p.length; |
| 15 | } |
| 16 | return out; |
| 17 | } |
| 18 | |
| 19 | const HEX = Array.from({ length: 256 }, (_, i) => i.toString(16).padStart(2, "0")); |
| 20 | |
| 21 | export function toHex(b: Uint8Array): string { |
| 22 | let s = ""; |
| 23 | for (let i = 0; i < b.length; i++) s += HEX[b[i]!]; |
| 24 | return s; |
| 25 | } |
| 26 | |
| 27 | export function fromHex(h: string): Uint8Array { |
| 28 | const out = new Uint8Array(h.length / 2); |
| 29 | for (let i = 0; i < out.length; i++) out[i] = parseInt(h.slice(i * 2, i * 2 + 2), 16); |
| 30 | return out; |
| 31 | } |
| 32 | |
| 33 | export function equalBytes(a: Uint8Array, b: Uint8Array): boolean { |
| 34 | if (a.length !== b.length) return false; |
| 35 | for (let i = 0; i < a.length; i++) if (a[i] !== b[i]) return false; |
| 36 | return true; |
| 37 | } |
| 38 | |
| 39 | /** Growable byte buffer used when assembling packs and pkt-line streams. */ |
| 40 | export class ByteWriter { |
| 41 | private buf = new Uint8Array(1024); |
| 42 | private len = 0; |
| 43 | |
| 44 | private ensure(extra: number) { |
| 45 | if (this.len + extra <= this.buf.length) return; |
| 46 | let cap = this.buf.length * 2; |
| 47 | while (cap < this.len + extra) cap *= 2; |
| 48 | const next = new Uint8Array(cap); |
| 49 | next.set(this.buf.subarray(0, this.len)); |
| 50 | this.buf = next; |
| 51 | } |
| 52 | |
| 53 | write(b: Uint8Array): void { |
| 54 | this.ensure(b.length); |
| 55 | this.buf.set(b, this.len); |
| 56 | this.len += b.length; |
| 57 | } |
| 58 | |
| 59 | byte(v: number): void { |
| 60 | this.ensure(1); |
| 61 | this.buf[this.len++] = v; |
| 62 | } |
| 63 | |
| 64 | uint32(v: number): void { |
| 65 | this.ensure(4); |
| 66 | this.buf[this.len++] = (v >>> 24) & 0xff; |
| 67 | this.buf[this.len++] = (v >>> 16) & 0xff; |
| 68 | this.buf[this.len++] = (v >>> 8) & 0xff; |
| 69 | this.buf[this.len++] = v & 0xff; |
| 70 | } |
| 71 | |
| 72 | get length(): number { |
| 73 | return this.len; |
| 74 | } |
| 75 | |
| 76 | bytes(): Uint8Array { |
| 77 | return this.buf.slice(0, this.len); |
| 78 | } |
| 79 | } |