41 lines
1023 B
JavaScript
41 lines
1023 B
JavaScript
/*!
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* bufferutil: WebSocket buffer utils
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* Copyright(c) 2015 Einar Otto Stangvik <einaros@gmail.com>
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* MIT Licensed
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*/
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'use strict';
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/**
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* Masks a buffer using the given mask.
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*
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* @param {Buffer} source The buffer to mask
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* @param {Buffer} mask The mask to use
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* @param {Buffer} output The buffer where to store the result
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* @param {Number} offset The offset at which to start writing
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* @param {Number} length The number of bytes to mask.
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* @public
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*/
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const mask = (source, mask, output, offset, length) => {
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for (var i = 0; i < length; i++) {
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output[offset + i] = source[i] ^ mask[i & 3];
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}
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};
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/**
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* Unmasks a buffer using the given mask.
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*
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* @param {Buffer} buffer The buffer to unmask
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* @param {Buffer} mask The mask to use
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* @public
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*/
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const unmask = (buffer, mask) => {
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// Required until https://github.com/nodejs/node/issues/9006 is resolved.
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const length = buffer.length;
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for (var i = 0; i < length; i++) {
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buffer[i] ^= mask[i & 3];
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}
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};
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module.exports = { mask, unmask };
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