4 * Merges an array of buffers into a new buffer.
6 * @param {Buffer[]} list The array of buffers to concat
7 * @param {Number} totalLength The total length of buffers in the list
8 * @return {Buffer} The resulting buffer
11 function concat (list, totalLength) {
12 const target = Buffer.allocUnsafe(totalLength);
15 for (var i = 0; i < list.length; i++) {
17 buf.copy(target, offset);
25 * Masks a buffer using the given mask.
27 * @param {Buffer} source The buffer to mask
28 * @param {Buffer} mask The mask to use
29 * @param {Buffer} output The buffer where to store the result
30 * @param {Number} offset The offset at which to start writing
31 * @param {Number} length The number of bytes to mask.
34 function _mask (source, mask, output, offset, length) {
35 for (var i = 0; i < length; i++) {
36 output[offset + i] = source[i] ^ mask[i & 3];
41 * Unmasks a buffer using the given mask.
43 * @param {Buffer} buffer The buffer to unmask
44 * @param {Buffer} mask The mask to use
47 function _unmask (buffer, mask) {
48 // Required until https://github.com/nodejs/node/issues/9006 is resolved.
49 const length = buffer.length;
50 for (var i = 0; i < length; i++) {
51 buffer[i] ^= mask[i & 3];
56 const bufferUtil = require('bufferutil');
57 const bu = bufferUtil.BufferUtil || bufferUtil;
60 mask (source, mask, output, offset, length) {
61 if (length < 48) _mask(source, mask, output, offset, length);
62 else bu.mask(source, mask, output, offset, length);
64 unmask (buffer, mask) {
65 if (buffer.length < 32) _unmask(buffer, mask);
66 else bu.unmask(buffer, mask);
70 } catch (e) /* istanbul ignore next */ {
71 module.exports = { concat, mask: _mask, unmask: _unmask };