73 lines
1.9 KiB
JavaScript
Executable File
73 lines
1.9 KiB
JavaScript
Executable File
'use strict';
|
|
|
|
/**
|
|
* Merges an array of buffers into a new buffer.
|
|
*
|
|
* @param {Buffer[]} list The array of buffers to concat
|
|
* @param {Number} totalLength The total length of buffers in the list
|
|
* @return {Buffer} The resulting buffer
|
|
* @public
|
|
*/
|
|
function concat(list, totalLength) {
|
|
const target = Buffer.allocUnsafe(totalLength);
|
|
var offset = 0;
|
|
|
|
for (var i = 0; i < list.length; i++) {
|
|
const buf = list[i];
|
|
buf.copy(target, offset);
|
|
offset += buf.length;
|
|
}
|
|
|
|
return target;
|
|
}
|
|
|
|
/**
|
|
* Masks a buffer using the given mask.
|
|
*
|
|
* @param {Buffer} source The buffer to mask
|
|
* @param {Buffer} mask The mask to use
|
|
* @param {Buffer} output The buffer where to store the result
|
|
* @param {Number} offset The offset at which to start writing
|
|
* @param {Number} length The number of bytes to mask.
|
|
* @public
|
|
*/
|
|
function _mask(source, mask, output, offset, length) {
|
|
for (var i = 0; i < length; i++) {
|
|
output[offset + i] = source[i] ^ mask[i & 3];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Unmasks a buffer using the given mask.
|
|
*
|
|
* @param {Buffer} buffer The buffer to unmask
|
|
* @param {Buffer} mask The mask to use
|
|
* @public
|
|
*/
|
|
function _unmask(buffer, mask) {
|
|
// Required until https://github.com/nodejs/node/issues/9006 is resolved.
|
|
const length = buffer.length;
|
|
for (var i = 0; i < length; i++) {
|
|
buffer[i] ^= mask[i & 3];
|
|
}
|
|
}
|
|
|
|
try {
|
|
const bufferUtil = require('bufferutil');
|
|
const bu = bufferUtil.BufferUtil || bufferUtil;
|
|
|
|
module.exports = {
|
|
mask(source, mask, output, offset, length) {
|
|
if (length < 48) _mask(source, mask, output, offset, length);
|
|
else bu.mask(source, mask, output, offset, length);
|
|
},
|
|
unmask(buffer, mask) {
|
|
if (buffer.length < 32) _unmask(buffer, mask);
|
|
else bu.unmask(buffer, mask);
|
|
},
|
|
concat
|
|
};
|
|
} catch (e) /* istanbul ignore next */ {
|
|
module.exports = { concat, mask: _mask, unmask: _unmask };
|
|
}
|