securityos/node_modules/endianness/endianness.umd.js

78 lines
3.1 KiB
JavaScript

(function (global, factory) {typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :typeof define === 'function' && define.amd ? define(factory) :(global.endianness = factory());}(this, (function () { 'use strict'
var endianness = (function () {
'use strict';
/*
* Copyright (c) 2017-2018 Rafael da Silva Rocha.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/**
* @fileoverview A function to swap endianness in byte buffers.
* @see https://github.com/rochars/endianness
*/
/** @module endianness */
/**
* Swap the byte ordering in a buffer. The buffer is modified in place.
* @param {!Array|!Uint8Array} bytes The bytes.
* @param {number} offset The byte offset.
* @param {number=} start The start index. Assumes 0.
* @param {number=} end The end index. Assumes the buffer length.
* @throws {Error} If the buffer length is not valid.
*/
function endianness(bytes, offset) {
var start = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
var end = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : bytes.length;
if (end % offset) {
throw new Error("Bad buffer length.");
}
for (var index = start; index < end; index += offset) {
swap(bytes, offset, index);
}
}
/**
* Swap the byte order of a value in a buffer. The buffer is modified in place.
* @param {!Array|!Uint8Array} bytes The bytes.
* @param {number} offset The byte offset.
* @param {number} index The start index.
* @private
*/
function swap(bytes, offset, index) {
offset--;
for (var x = 0; x < offset; x++) {
/** @type {*} */
var theByte = bytes[index + x];
bytes[index + x] = bytes[index + offset];
bytes[index + offset] = theByte;
offset--;
}
}
return endianness;
}());
var module = module || {}; module.exports = endianness; module.exports['default'] = endianness; return endianness;})));