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438 lines
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HTML
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<h1 class="page-title">Source: operations/Rotate.js</h1>
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<section>
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<article>
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<pre
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class="sunlight-highlight-javascript linenums">/**
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* Bit rotation operations.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*
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* @namespace
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*
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* @todo Support for UTF16
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*/
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var Rotate = {
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/**
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* @constant
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* @default
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*/
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ROTATE_AMOUNT: 1,
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/**
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* @constant
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* @default
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*/
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ROTATE_WHOLE: false,
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/**
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* Runs rotation operations across the input data.
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*
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* @private
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* @param {byte_array} data
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* @param {number} amount
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* @param {function} algo - The rotation operation to carry out
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* @returns {byte_array}
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*/
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_rot: function(data, amount, algo) {
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var result = [];
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for (var i = 0; i < data.length; i++) {
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var b = data[i];
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for (var j = 0; j < amount; j++) {
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b = algo(b);
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}
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result.push(b);
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}
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return result;
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},
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/**
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* Rotate right operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_rotr: function(input, args) {
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if (args[1]) {
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return Rotate._rotr_whole(input, args[0]);
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} else {
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return Rotate._rot(input, args[0], Rotate._rotr);
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}
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},
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/**
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* Rotate left operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_rotl: function(input, args) {
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if (args[1]) {
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return Rotate._rotl_whole(input, args[0]);
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} else {
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return Rotate._rot(input, args[0], Rotate._rotl);
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}
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},
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/**
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* @constant
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* @default
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*/
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ROT13_AMOUNT: 13,
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/**
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* @constant
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* @default
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*/
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ROT13_LOWERCASE: true,
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/**
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* @constant
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* @default
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*/
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ROT13_UPPERCASE: true,
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/**
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* ROT13 operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_rot13: function(input, args) {
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var amount = args[2],
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output = input,
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chr,
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rot13_lowercase = args[0],
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rot13_upperacse = args[1];
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if (amount) {
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if (amount < 0) {
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amount = 26 - (Math.abs(amount) % 26);
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}
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for (var i = 0; i < input.length; i++) {
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chr = input[i];
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if (rot13_upperacse && chr >= 65 && chr <= 90) { // Upper case
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chr = (chr - 65 + amount) % 26;
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output[i] = chr + 65;
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} else if (rot13_lowercase && chr >= 97 && chr <= 122) { // Lower case
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chr = (chr - 97 + amount) % 26;
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output[i] = chr + 97;
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}
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}
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}
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return output;
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},
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/**
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* Rotate right bitwise op.
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*
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* @private
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* @param {byte} b
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* @returns {byte}
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*/
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_rotr: function(b) {
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var bit = (b & 1) << 7;
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return (b >> 1) | bit;
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},
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/**
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* Rotate left bitwise op.
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*
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* @private
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* @param {byte} b
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* @returns {byte}
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*/
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_rotl: function(b) {
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var bit = (b >> 7) & 1;
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return ((b << 1) | bit) & 0xFF;
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},
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/**
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* Rotates a byte array to the right by a specific amount as a whole, so that bits are wrapped
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* from the end of the array to the beginning.
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*
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* @private
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* @param {byte_array} data
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* @param {number} amount
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* @returns {byte_array}
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*/
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_rotr_whole: function(data, amount) {
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var carry_bits = 0,
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new_byte,
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result = [];
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amount = amount % 8;
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for (var i = 0; i < data.length; i++) {
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var old_byte = data[i] >>> 0;
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new_byte = (old_byte >> amount) | carry_bits;
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carry_bits = (old_byte & (Math.pow(2, amount)-1)) << (8-amount);
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result.push(new_byte);
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}
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result[0] |= carry_bits;
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return result;
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},
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/**
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* Rotates a byte array to the left by a specific amount as a whole, so that bits are wrapped
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* from the beginning of the array to the end.
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*
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* @private
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* @param {byte_array} data
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* @param {number} amount
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* @returns {byte_array}
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*/
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_rotl_whole: function(data, amount) {
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var carry_bits = 0,
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new_byte,
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result = [];
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|
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amount = amount % 8;
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||
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for (var i = data.length-1; i >= 0; i--) {
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var old_byte = data[i];
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new_byte = ((old_byte << amount) | carry_bits) & 0xFF;
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carry_bits = (old_byte >> (8-amount)) & (Math.pow(2, amount)-1);
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result[i] = (new_byte);
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}
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result[data.length-1] = result[data.length-1] | carry_bits;
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return result;
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},
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};
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</pre>
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</article>
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</section>
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<footer>
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<span class="copyright">
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© Crown Copyright 2016
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<span class="jsdoc-message">
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.3</a>
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on Mon Nov 28th 2016
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using the <a href="https://github.com/docstrap/docstrap">DocStrap template</a>.
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<script src="scripts/docstrap.lib.js"></script>
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<script src="scripts/toc.js"></script>
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<script type="text/javascript" src="scripts/fulltext-search-ui.js"></script>
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<script>
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$( function () {
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$( "[id*='$']" ).each( function () {
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var $this = $( this );
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$this.attr( "id", $this.attr( "id" ).replace( "$", "__" ) );
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} );
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||
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$( ".tutorial-section pre, .readme-section pre, pre.prettyprint.source" ).each( function () {
|
||
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var $this = $( this );
|
||
|
|
|
||
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var example = $this.find( "code" );
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||
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exampleText = example.html();
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||
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var lang = /{@lang (.*?)}/.exec( exampleText );
|
||
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|
if ( lang && lang[1] ) {
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||
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exampleText = exampleText.replace( lang[0], "" );
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example.html( exampleText );
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||
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|
lang = lang[1];
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||
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} else {
|
||
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|
var langClassMatch = example.parent()[0].className.match(/lang\-(\S+)/);
|
||
|
|
lang = langClassMatch ? langClassMatch[1] : "javascript";
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( lang ) {
|
||
|
|
|
||
|
|
$this
|
||
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|
.addClass( "sunlight-highlight-" + lang )
|
||
|
|
.addClass( "linenums" )
|
||
|
|
.html( example.html() );
|
||
|
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|
||
|
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}
|
||
|
|
} );
|
||
|
|
|
||
|
|
Sunlight.highlightAll( {
|
||
|
|
lineNumbers : true,
|
||
|
|
showMenu : true,
|
||
|
|
enableDoclinks : true
|
||
|
|
} );
|
||
|
|
|
||
|
|
$.catchAnchorLinks( {
|
||
|
|
navbarOffset: 10
|
||
|
|
} );
|
||
|
|
$( "#toc" ).toc( {
|
||
|
|
anchorName : function ( i, heading, prefix ) {
|
||
|
|
return $( heading ).attr( "id" ) || ( prefix + i );
|
||
|
|
},
|
||
|
|
selectors : "#toc-content h1,#toc-content h2,#toc-content h3,#toc-content h4",
|
||
|
|
showAndHide : false,
|
||
|
|
smoothScrolling: true
|
||
|
|
} );
|
||
|
|
|
||
|
|
$( "#main span[id^='toc']" ).addClass( "toc-shim" );
|
||
|
|
$( '.dropdown-toggle' ).dropdown();
|
||
|
|
|
||
|
|
$( "table" ).each( function () {
|
||
|
|
var $this = $( this );
|
||
|
|
$this.addClass('table');
|
||
|
|
} );
|
||
|
|
|
||
|
|
} );
|
||
|
|
</script>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
<!--Navigation and Symbol Display-->
|
||
|
|
|
||
|
|
|
||
|
|
<!--Google Analytics-->
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
<script type="text/javascript">
|
||
|
|
$(document).ready(function() {
|
||
|
|
SearcherDisplay.init();
|
||
|
|
});
|
||
|
|
</script>
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|