dynatrace-cordova-outsystems-plugin/node_modules/ws/lib/buffer-util.js

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

'use strict';

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

/**
 * 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);
  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];
  }
}

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

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

/**
 * 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;

  var buf;

  if (data instanceof ArrayBuffer) {
    buf = Buffer.from(data);
  } else if (ArrayBuffer.isView(data)) {
    buf = viewToBuffer(data);
  } else {
    buf = Buffer.from(data);
    toBuffer.readOnly = false;
  }

  return buf;
}

/**
 * Converts an `ArrayBuffer` view into a buffer.
 *
 * @param {(DataView|TypedArray)} view The view to convert
 * @return {Buffer} Converted view
 * @private
 */
function viewToBuffer(view) {
  const buf = Buffer.from(view.buffer);

  if (view.byteLength !== view.buffer.byteLength) {
    return buf.slice(view.byteOffset, view.byteOffset + view.byteLength);
  }

  return buf;
}

try {
  const bufferUtil = require('bufferutil');
  const bu = bufferUtil.BufferUtil || bufferUtil;

  module.exports = {
    concat,
    mask(source, mask, output, offset, length) {
      if (length < 48) _mask(source, mask, output, offset, length);
      else bu.mask(source, mask, output, offset, length);
    },
    toArrayBuffer,
    toBuffer,
    unmask(buffer, mask) {
      if (buffer.length < 32) _unmask(buffer, mask);
      else bu.unmask(buffer, mask);
    }
  };
} catch (e) /* istanbul ignore next */ {
  module.exports = {
    concat,
    mask: _mask,
    toArrayBuffer,
    toBuffer,
    unmask: _unmask
  };
}