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Name	Size	Permission	Action
buffer-util.js	2.98 KB	-rw-rw-r--
constants.js	360 B	-rw-rw-r--
event-target.js	7.15 KB	-rw-rw-r--
extension.js	6.04 KB	-rw-rw-r--
limiter.js	1.01 KB	-rw-rw-r--
permessage-deflate.js	13.78 KB	-rw-rw-r--
receiver.js	15.36 KB	-rw-rw-r--
sender.js	12.33 KB	-rw-rw-r--
stream.js	3.99 KB	-rw-rw-r--
subprotocol.js	1.46 KB	-rw-rw-r--
validation.js	3.29 KB	-rw-rw-r--
websocket-server.js	15.32 KB	-rw-rw-r--
websocket.js	33.44 KB	-rw-rw-r--

Code Editor : buffer-util.js

'use strict';

const { EMPTY_BUFFER } = require('./constants');

const FastBuffer = Buffer[Symbol.species];

/**
 * 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) {
  if (list.length === 0) return EMPTY_BUFFER;
  if (list.length === 1) return list[0];

const target = Buffer.allocUnsafe(totalLength);
  let offset = 0;

for (let i = 0; i < list.length; i++) {
    const buf = list[i];
    target.set(buf, offset);
    offset += buf.length;
  }

if (offset < totalLength) {
    return new FastBuffer(target.buffer, target.byteOffset, offset);
  }

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 (let 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) {
  for (let i = 0; i < buffer.length; i++) {
    buffer[i] ^= mask[i & 3];
  }
}

/**
 * Converts a buffer to an `ArrayBuffer`.
 *
 * @param {Buffer} buf The buffer to convert
 * @return {ArrayBuffer} Converted buffer
 * @public
 */
function toArrayBuffer(buf) {
  if (buf.length === buf.buffer.byteLength) {
    return buf.buffer;
  }

return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.length);
}

/**
 * Converts `data` to a `Buffer`.
 *
 * @param {*} data The data to convert
 * @return {Buffer} The buffer
 * @throws {TypeError}
 * @public
 */
function toBuffer(data) {
  toBuffer.readOnly = true;

if (Buffer.isBuffer(data)) return data;

let buf;

if (data instanceof ArrayBuffer) {
    buf = new FastBuffer(data);
  } else if (ArrayBuffer.isView(data)) {
    buf = new FastBuffer(data.buffer, data.byteOffset, data.byteLength);
  } else {
    buf = Buffer.from(data);
    toBuffer.readOnly = false;
  }

return buf;
}

module.exports = {
  concat,
  mask: _mask,
  toArrayBuffer,
  toBuffer,
  unmask: _unmask
};

/* istanbul ignore else  */
if (!process.env.WS_NO_BUFFER_UTIL) {
  try {
    const bufferUtil = require('bufferutil');

module.exports.mask = function (source, mask, output, offset, length) {
      if (length < 48) _mask(source, mask, output, offset, length);
      else bufferUtil.mask(source, mask, output, offset, length);
    };

module.exports.unmask = function (buffer, mask) {
      if (buffer.length < 32) _unmask(buffer, mask);
      else bufferUtil.unmask(buffer, mask);
    };
  } catch (e) {
    // Continue regardless of the error.
  }
}

Urban Research Lab

Urban Research Lab

The Urban Research Lab (URL) at IIIT-Delhi was established in 2020, during a time when the pandemic brought the complexities of urban life more visible than ever. What started as an initiative by faculty and students has grown into a collaborative space for critically exploring and reimagining the urban questions through research, dialogue, and interdisciplinary engagement.