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| export const encoder = new TextEncoder(); | |
| export const decoder = new TextDecoder(); | |
| const MAX_INT32 = 2 ** 32; | |
| export function concat(...buffers) { | |
| const size = buffers.reduce((acc, { length }) => acc + length, 0); | |
| const buf = new Uint8Array(size); | |
| let i = 0; | |
| for (const buffer of buffers) { | |
| buf.set(buffer, i); | |
| i += buffer.length; | |
| } | |
| return buf; | |
| } | |
| function writeUInt32BE(buf, value, offset) { | |
| if (value < 0 || value >= MAX_INT32) { | |
| throw new RangeError(`value must be >= 0 and <= ${MAX_INT32 - 1}. Received ${value}`); | |
| } | |
| buf.set([value >>> 24, value >>> 16, value >>> 8, value & 0xff], offset); | |
| } | |
| export function uint64be(value) { | |
| const high = Math.floor(value / MAX_INT32); | |
| const low = value % MAX_INT32; | |
| const buf = new Uint8Array(8); | |
| writeUInt32BE(buf, high, 0); | |
| writeUInt32BE(buf, low, 4); | |
| return buf; | |
| } | |
| export function uint32be(value) { | |
| const buf = new Uint8Array(4); | |
| writeUInt32BE(buf, value); | |
| return buf; | |
| } | |
| export function encode(string) { | |
| const bytes = new Uint8Array(string.length); | |
| for (let i = 0; i < string.length; i++) { | |
| const code = string.charCodeAt(i); | |
| if (code > 127) { | |
| throw new TypeError('non-ASCII string encountered in encode()'); | |
| } | |
| bytes[i] = code; | |
| } | |
| return bytes; | |
| } | |