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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;
- }
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